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This study investigates the pyrolysis and adsorption properties of biochar derived from coconut shell (BC-CS), rice husk (BC-RH), and cow manure (BC-CM) under varying thermal treatment conditions. Biochar samples were produced at 800 °C with residence times ranging from 0 to 60 min. Their characteristics were analyzed using their Brunauer–Emmett–Teller (BET) surface area, total pore volume, and pore diameter measurements. BC-CM exhibited the highest BET surface area of 263.3 m2/g and a total pore volume of 0.164 cm3/g, while BC-RH and BC-CS showed maximum BET surface areas of 220.62 m2/g and 197.38 m2/g, respectively. Nitrogen adsorption–desorption isotherms revealed distinct microporous and mesoporous structures, with BC-CM demonstrating superior adsorption capacity across all relative pressures. The adsorption kinetics of methylene blue (MB) were examined at initial concentrations of 1 ppm, 5 ppm, and 10 ppm, with varying biochar doses (0.1 g, 0.3 g, and 0.5 g). The results showed that the adsorption rate constant (k) decreased with higher initial MB concentrations, while the equilibrium adsorption capacity (qe) increased. BC-CM achieved the highest qe of 2.18 mg/g at 10 ppm and a 0.5 g dose, followed by BC-RH-800-45 (1.145 mg/g) and BC-CS (0.340 mg/g). The adsorption process was well described by a pseudo-second-order kinetic model, indicating chemisorption as the dominant mechanism. Increasing biochar doses improved MB removal efficiency, highlighting the dose-dependent nature of adsorption. These findings underscore the importance of optimizing pyrolysis parameters to enhance biochar's adsorption performance and identify key factors influencing its effectiveness in environmental applications. [ABSTRACT FROM AUTHOR]

The rheological properties of nanocellulose aqueous suspensions play a critical role in the development of nanocellulose-based bulk materials. High-crystalline, high-aspect ratio, and slender nanofibrillated cellulose (NFC) were extracted from four biomass resources. The cellulose nanofibrils and nanofibril bundles formed inter-connected networks in the NFC aqueous suspensions. The storage moduli of the suspensions with different concentrations were higher than their corresponding loss moduli. As the concentration increased, the storage and loss modulus of NFC dispersion increased. When the shear rate increased to a certain value, there were differences in the changing trend of the rheological behavior of NFC aqueous suspensions derived from different biomass resources and the suspensions with different solid concentrations. NFC dispersion's storage and loss modulus increased when the temperature rose to nearly 80°C. We hope this study can deepen the understanding of the rheological properties of NFC colloids derived from different biomass resources. [ABSTRACT FROM AUTHOR]

Biogas production from wheat straw (WS), cow manure (CM), and sewage sludge (SS) have positive impacts on the environment and economy. Therefore, this study investigated the optimization of biogas production from WS and pretreated with H2SO4 during codigesting with SS or CM as co-substrate. The total solids (TS), volatile solids (VS), carbon (C), nitrogen (N), and pH of biomass samples were measured. WS was first treated with different concentrations of H2SO4 and then mixed with different ratios of SS and digested under anaerobic digestion (AD). Both daily and cumulative biogas generated by AD were recorded under mesophilic conditions for 21 days. Chemical analysis indicated that WS and SS showed closely similar values of TS and VS, except CM had the lowest TS and VS. Also, WS had the highest C/N ratio, followed by CM, while the least C/N ratio was observed in SS. The pH values of CM and SS were within the ideal pH range for the AD process. The highest volume of biogas production was observed only in 4% H2SO4 treated WS with 50% SS, followed by 4% H2SO4 treated WS with 10% CM inoculum, whereas the lowest rate of biogas production was found with untreated WS with 10% SS. The highest VS consumed was 64.8% for WS treated with 4% H2SO4 and the lowest VS consumed was 12.75% for untreated WS mixed with SS at ratio of 30:70. Overall, it can be concluded that codigestion of H2SO4 treated WS with SS or CM can greatly enhance the efficiency of biogas production under the AD process. [ABSTRACT FROM AUTHOR]

The deployment of hybrid renewable energy systems remains the quickest way to salvage the dwindling grid supply in Nigeria and improve energy access. The assessment of biomass and hydro potentials across the geopolitical zones of the country to determine the optimal locations for a Biogas fired thermal plant for energy generation is thoroughly addressed in this paper. Multiple Geographical Information System (GIS) approaches were used to assess the energy potentials of crop and forest residues for biomass, as well as waterbodies, and waterlines for a hydrothermal power plant. The study applies the inverse distance weighting and weighted overlay multicriteria decision analysis. Forest areas, waterbodies, distance from water sources and road accessibility were considered for locating the biomass and hydrothermal facilities within multiple ring buffer distances of 200 m–2000 m from the combined biomass and hydropower resources. The result shows four states with potentials to host biomass-hydrothermal power plants in Nigeria; Niger, Kaduna, Bauchi and Taraba states with biomass potentials of 831.9 tonnes/yr, 1173.27 tonnes/yr, 322 tonnes/yr and 739.48 tonnes/yr, respectively and inland waterways. It further shows that these plants can be optimally located within 2000 m from the source of the biomass and hydro resources. This paper recommends the utilization of these results to carry out feasibility studies and make informed decisions on the exploration of these resources for power generation. It also advocates for a control in the commercialization of forest residues to sustain the production from these hybrid plants and supports the Nigerian bio-energy policy that proposes to effectively utilize the Nigeria's non-fuelwood as substitute to felling of trees.

The understanding of the geographical variability of biomass energy is an essential requirement for the optimal location of biomass energy conversion plants. This research presents a multicriteria GIS-based assessment of biomass energy potentials and the appropriate siting of biomass plants in Nigeria. The study applies the weighted overlay multicriteria decision analysis method. Crop and forest areas, settlement (energy supply areas), shrub/grasslands, barren land, water bodies, distance from water sources, road accessibility, topography, and aspect are the criteria that were considered for locating a biomass facility in this study. The results suggest that the theoretical, technical, and economical energy potentials of crop residues are highest in the North-East region of Nigeria and estimated at 1,163.32, 399.73, and 110.56 PJ/yr, respectively, and lowest in the South-East at 52.36, 17.99, and 4.98 PJ/yr, respectively. The theoretical, technical, and economical energy potentials of forest residues are highest in the North-West, estimated at 260.18, 156.11, and 43.18 PJ/yr, respectively, and lowest in the South-East at 1.79, 1.08, and 0.30 PJ/yr, respectively. Although most areas were identified to be suitable for siting biomass plants across Nigeria, the most suitable areas are located in the northern part of the country and include Niger, Zamfara, the Federal Capital Territory, Nassarawa, Kano, Kebbi, Kaduna, and Borno State. The study supports the Nigerian bio-energy policy that proposes to effectively utilize Nigeria’s non-fuelwood as a substitute for the felling of trees. This is very important to strengthen its commitment at the COP26 International Climate Conference, which is to conserve and restore its forest. Furthermore, this study will serve as a good reference for policymakers to make well-informed decisions on tackling the energy insecurity in Nigeria.

The conversion of agricultural waste into organic fertilizer through vermicomposting is a sustainable waste management solution and an income source for organic fertilizer producers. Most of the agricultural waste in Iran is burned, triggering an array of negative consequences. Vermicompost production at the farm level is rarely practiced in Iran, and farmers play a central role. The study aimed to identify the factors influencing the adoption of on-farm vermicomposting and its level (number of cycles), barriers to it, and to provide adapted policy recommendations. The study used a mixed-method approach, with a survey on 142 farmers and semi-structured interviews with stakeholders. The study showed that attitude (β = 0.515, sig. = 0.01), subjective norms (β = 1.745, sig. = 0.01), vermicomposting training (β = 2.160, sig. = 0.01), safe spraying (β = 2.915, sig. = 0.01), and integrated pest management (β = 1.793, sig. = 0.01) influenced the participation in vermicomposting. Some of the barriers to vermicomposting revealed by the qualitative research were the initial investment cost, farmers’ short-term vision, lack of necessary infrastructure, and lack of subsidies. The study complements the scant information on farmers’ vermicomposting behavior and proves that its understanding is essential to remove barriers and engage farmers in vermicomposting. Practical recommendations based on findings support sustainable agricultural waste management.

The design and fabrication of highly efficient, cheap, and stable heterogeneous catalyst for the advancement of sustainable organic transformation is a crucial goal in both academic research and industry. Herein, an efficient catalyst based on Cu-decorating on a N, P-codoped porous carbon(Cu/NPC) derived from wheat straw was successfully synthesized by a cost-effective method. The as-prepared Cu/NPC showed superior catalytic activity for the N-alkylation of amines with alcohols via the borrowing hydrogen strategy. A variety of aromatic amines were converted into the corresponding secondary amines in moderate to excellent yields. Noted that, such catalyst can be easily prepared, recovered and recycled four times without obvious loss in both activity and selectivity.

The single-component adsorption of CO2, CO, N2, and H2 at 25 and 35 °C was studied using microporous faujasite-framework zeolites (NaY and NaX), activated carbons (GCN and MSP), and metal–organic frameworks (A100 and Z1200) as starting points for the separation of CO2 from syngases produced by gasifying biomass-based solid wastes. The indicated adsorption isotherms and uptake of the adsorbates strongly depended on the adsorbates themselves as well as on the adsorbents because of significant differences in the surface features, such as surface nonuniformity, and in the molecular properties. The selectivity of CO2 to the other gases also varied with the adsorbents due to the distinctive energetic characteristics. The surfaces of the zeolites were the most energetically heterogeneous ones, yielding higher CO2 uptake at low pressures, while the two activated carbons and A100 had moderate surface heterogeneities, and MSP showed the highest CO2 uptake at high pressures, such as 6 bar, at which the micropore volume and surface area are important. Z1200, which has highly homogeneous surfaces and no high-affinity-binding sites, exhibited the lowest CO2 adsorption capacity regardless of equilibrated pressure. The surface nonuniformities of the six sorbents were consistent with the calculated isosteric heats of CO2 adsorption. CO2 could be reversibly adsorbed on NaY and MSP but not on GCN, with some metal impurities, although all these adsorbents showed a fully reversible process for CO adsorption. The estimated working capacity for CO2 adsorption at 25 °C was 0.78–6.50 mmol/g, depending on the sorbents used. The highest value was disclosed for MSP, the surface energetic heterogeneity of which was between that of zeolites and Z1200. Such a high working capacity bodes well for use in our later applications. [ABSTRACT FROM AUTHOR]

The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are important processes for various energy devices, including polymer electrolyte fuel cells, rechargeable metal–air batteries, and water electrolyzers. We herein report the preparation of a rare metal-free and highly efficient ORR/OER electrocatalyst by calcination of a mixture of blood meal and ascidian-derived cellulose nanofibers. The obtained carbon alloys showed high ORR/OER performances and proved to be promising electrocatalysts. The carbon alloys synthesized entirely from biomass resources not only lead to a new electrocatalyst fabrication process but also contribute to CO2 reduction and the realization of a good life-cycle assessment value in fabrication of a sustainable energy device.

In Northeast Brazil, the use of biomass for energy generation is settled on traditional productive arrangements, such as a sugarcane production system in the humid Atlantic coastal area and firewood extraction from native tropical dry forests in the west. In parallel, substantial amounts of other biomass sources, such as residues from agricultural or urban processes, are still little used or wholly wasted, fudging the opportunity to generate new value chains based on these biomass sources. We hypothesize that using these non-traditional biomass sources to produce biofuels would significantly increase the regional bioenergy supply. In this context, this article discusses the potential for the production and use of biofuels and bioenergy in Northeast Brazil and its effects on regional development, which may be useful for both private actors and policymakers in the energy sector. The use of biomass sources for energy in the region is significant, reaching approximately 8.8 million tons of oil equivalent (toe) per year, emphasizing the already consolidated production of sugarcane and its derivatives. The use of all biomass resources in the Northeast region could supply around 4% of the Brazilian national electrical energy demand, with an environmental footprint of 0.055 tCO2eq per toe, which would contribute to reducing emissions from the Brazilian energy matrix generation. Regarding the spatial distribution of biomass sources, sugarcane prevails on the coast, firewood and livestock manure in the dryland area towards the west, and municipal solid waste is distributed throughout the region within urban areas. Different from what we expected, the potential energy recovery from municipal waste and animal manure would increase by only 17% the current bioenergy supply. In the future, since the majority of the region presents a semi-arid climate with limited rainfall, to increase the use of biomass as an energy source, there is a need to increase the supply of biomass sources with high efficiency in water use and good yields in drylands. For this, the cultivation and use of cacti and agave, for example, could contribute to making biorefineries viable in the region. Above all, public policies for harnessing bioenergy in NE Brazil must seek opportunities associated with the carbon/decarbonization economy, with studies being needed to assess the technical, economic, social, and environmental viability of future productive arrangements. [ABSTRACT FROM AUTHOR]

To reduce greenhouse gas (GHG) emissions, biomass has been increasingly developed as a renewable and clean alternative to fossil fuels because of its carbon-neutral characteristics. China has been investigating the rational development and use of bioenergy for developing its clean energy and achieving carbon neutrality. Substituting fossil fuels with multi-source and multi-approach utilized bioenergy and corresponding carbon reduction in China remain largely unexplored. Here, a comprehensive bioenergy accounting model with a multi-dimensional analysis was developed by combining spatial, life cycle, and multi-path analyses. Accordingly, the bioenergy production potential and GHG emission reduction for each distinct type of biomass feedstock through different conversion pathways were estimated. The sum of all available organic waste (21.55 EJ yr−1) and energy plants on marginal land (11.77 EJ yr−1) in China produced 23.30 EJ of bioenergy and reduced 2,535.32 Mt CO2-eq emissions, accounting for 19.48% and 25.61% of China’s total energy production and carbon emissions in 2020, respectively. When focusing on the carbon emission mitigation potential of substituting bioenergy for conventional counterparts, bioelectricity was the most effective, and its potential was 4.45 and 8.58 times higher than that of gaseous and liquid fuel alternatives, respectively. In this study, life cycle emission reductions were maximized by a mix of bioenergy end uses based on biomass properties, with an optimal 78.56% bioenergy allocation from biodiesel, densified solid biofuel, biohydrogen, and biochar. The main regional bioenergy GHG mitigation focused on the Jiangsu, Sichuan, Guangxi, Henan, and Guangdong provinces, contributing to 31.32% of the total GHG mitigation potential. This study provides valuable guidance on exploiting untapped biomass resources in China to secure carbon neutrality by 2060.

The conversion of agricultural waste into organic fertilizer through vermicomposting is a sustainable waste management solution and an income source for organic fertilizer producers. Most of the agricultural waste in Iran is burned, triggering an array of negative consequences. Vermicompost production at the farm level is rarely practiced in Iran, and farmers play a central role. The study aimed to identify the factors influencing the adoption of on-farm vermicomposting and its level (number of cycles), barriers to it, and to provide adapted policy recommendations. The study used a mixed-method approach, with a survey on 142 farmers and semi-structured interviews with stakeholders. The study showed that attitude (β = 0.515, sig. = 0.01), subjective norms (β = 1.745, sig. = 0.01), vermicomposting training (β = 2.160, sig. = 0.01), safe spraying (β = 2.915, sig. = 0.01), and integrated pest management (β = 1.793, sig. = 0.01) influenced the participation in vermicomposting. Some of the barriers to vermicomposting revealed by the qualitative research were the initial investment cost, farmers' short-term vision, lack of necessary infrastructure, and lack of subsidies. The study complements the scant information on farmers' vermicomposting behavior and proves that its understanding is essential to remove barriers and engage farmers in vermicomposting. Practical recommendations based on findings support sustainable agricultural waste management. [ABSTRACT FROM AUTHOR]

In this work, an estimation was made of the potential for energy generation with biomass resources from the area, and a system of sustainability indicators was proposed to evaluate the contribution of the use of biomass resources to the eco-tourism complex Las Terrazas. It was confirmed that the most important biomass wastes are from pigs, which produce 3 m3 biogas/day, and forestry wastes from the mountains. In a total of 5 201 ha with forest resources, a residual biomass potential of 4 524,87 t/year was estimated, which corresponds to a usable energy potential of 9,52 GWh/year. A system of biophysical indicators was proposed that can express the level of sustainability that the settlement could reach from the best use of the available biomass resources. [ABSTRACT FROM AUTHOR]

The utilization of agricultural by-products for the synthesis of hybrid nanomaterials represents an environmentally sustainable approach. This research aims to comprehensively investigate high-performance silver and copper nanoparticles hybrid materials based on carboxymethyl-modified cellulose / lignin derived from rice husks (CMC / CML-AgNPs and CMC / CML-CuONPs) and apply them for antimicrobial activities. CMC / CML was used to reduce Ag / Cu cations to the atomic level and then efficiently stabilize Ag / CuO nanoparticles, an eco-friendly method and sustainable development. The hybrid nanomaterials were successfully synthesized with spherical shapes and particle sizes ranging from 4 to 16 nm. The diffraction peaks at 38.46°, 46.57°, 64.93°, and 77.55° were ascribed to the face-centered cubic crystal lattice (111), (200), (220), and (311) of silver nanoparticles in the CMC / CML-AgNPs. The peaks were 32.26°, 46.06°, 52.16°, 61.71°, 63.80°, and 71.23° associating with the (110,20−2), (112), (11−3), (310), and (221) plane orientations of CuO nanoparticles. The proposed materials demonstrated highly efficient antimicrobial performances. Particularly, CMC-AgNPs and CML-CuONPs exhibited an inhibitory capability of up to 100 % against E. coli and S. aureus within 72 h. Simultaneously, the antifungal results showed that hybrid nanomaterials have a better ability to inhibit the A. niger than A. flavus fungus. When experimenting on peanut seeds, hybrid nanomaterials showed an inhibitory capability of up to 99.0 % against A. niger. IC 50 values of the hybrid nanomaterials range from 0.872 mg/mL to 1.188 mg/mL, confirming that these materials are non-cytotoxic. These materials exhibit significant stability and enduring antimicrobial efficacy, making them ideal for sustainable development of various antibacterial and antifungal blocks for the near future. • Advanced hybrid nanomaterials based on modified biopolymer extracted from rice husks • New functional materials with highly effective antimicrobial properties • Investigate high-performance hybrid nanomaterials from carboxymethyl-modified cellulose/lignin derived from rice husks • A sustainable framework for biomedicine and agriculture driven by the rapid growth of genetically modified microbes [ABSTRACT FROM AUTHOR]

There is a growing interest in utilizing sustainable and renewable biomass resources to construct high-performance hydrogels for flexible electronics. In this study, soybean protein isolate (SPI) with abundant functional groups was introduced into the hydrogel matrix, while the connection between SPI, MXene and the polymer network was strengthened by hydrogen bonding. The sensible strategy overcame the problems of easy oxidation, agglomeration and weak interactions that existed in the binding of conductive filler MXene nanosheets with polymer chains. The prepared composite hydrogel exhibited integrated properties of high stretchability (>800 %), excellent self-adhesive property, plasticity, injectability, cyclic stability and durability in extreme environments (-20–60°C). Noteworthily, this hydrogel demonstrated high sensitivity and stable electrical resistance response to minor changes in tension, compression, bending, and temperature. In addition, this hydrogel exhibited excellent UV isolation and perspiration properties, making it ideal for practical applications of flexible devices in sports environments. The preparation of green, multipurpose, flexible electronics and human motion monitoring devices is made easier by the practical approach in this study. [Display omitted] • A bio-based reinforced hydrogel with notably enhanced stretchability is developed. • The composite hydrogel exhibits excellent strain/temperature sensing properties. • The UV isolation and perspiration properties make it more suitable for movement. • The synergistic effect of two components improves hydrogel internal structure. • The composite hydrogel has good adhesion to various materials. [ABSTRACT FROM AUTHOR]

Two-dimensional (2D) carbon nanomaterials have attracted extensive attention in the field of microwave absorption (MA) owing to their unique layered structure, tailorable atomic layer, tunable active surface, and high dielectric loss. Here, novel porous graphene-like heterostructures are facilely prepared through the carbonization of pomelo peel (PP)/prussian blue (PB) and PP/PB analogues (PBA). The magnetic particles derived from PB and PBA are uniformly distributed in the N-doped carbon (NC) ultra-thin nanosheets, which enhances the magnetic loss and improves the interfacial polarization. The optimized Fe/ZnO/NC-7 sample exhibits a maximum reflection loss (RL max) of −58.12 dB at 2.05 mm, and an ultrabroad effective bandwidth (RL ≤ −10 dB) of 7.6 GHz is achieved at 1.9 mm, which covers nearly half of the measured frequency range. The superior MA performance of Fe/ZnO/NC-7 composite is ascribed to the unique magnetic particle-embedded carbon nanosheet, which not only optimizes the impedance matching but also enhances the electromagnetic wave (EMW) attenuation ability through 2D conductive networks and multiple polarization processes. Overall, this work offers an environmentally friendly method to prepare low-cost and high-performance microwave absorbers from biowastes, which exhibit superior application potential as compared to other 2D microwave absorbers including graphene and MXene. [Display omitted] • A sustainable route from biowastes to excellent microwave absorbers. • The natural texture of pomelo peel and Fe catalysis is utilized to obtain ultra-thin carbon nanosheets. • Magnetic particle dispersion in honeycomb-structure carbon sheet optimizes the impedance matching. • The optimal RL value reaches −58.12 dB, and the broadest f e is 7.6 GHz at 1.9 mm. [ABSTRACT FROM AUTHOR]

At present, mankind faces the problem of increasingly serious global environmental crisis and growing shortage of petrochemical resources, making it more and more necessary to seek renewable substitute for petroleum. Biomass resources, which have received widespread attention and worldwide research, are the most common source of renewable carbon. Moreover, they are considered to be the major source of renewable green carbon today. Biomass resources contain three main aggregates, which are cellulose, hemicellulose, and lignin, as well as small amounts of other additional materials. Notably, the aromatic ring ethers linkage inside lignin molecules enables it to serve as a renewable and suitable feedstock for the production of aromatic chemicals and fuels. However, the recognition that lignin is the most difficult lignocellulosic biomass to degrade makes it much less valuable for practical applications. Therefore, in order to achieve high‐value conversion and utilization of lignin and replace non‐renewable fossil resources, the targeted conversion of lignin into chemicals and materials has become one of the major hot research areas. To this end, this article reviews research results on the use of molecular sieves (HZSM‐5) as catalysts for lignin degradation and conversion, providing an outlook on future research directions. [ABSTRACT FROM AUTHOR]

This research investigates the efficacy of three distinct extraction techniques; ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE), and conventional extraction (CE) for the isolation of phytochemicals from the flowers of Bauhinia variegata. The findings demonstrated that both UAE and MAE surpass CE, yielding higher concentrations of bioactive compounds while significantly reducing the extraction time. UAE demonstrated the highest extraction efficiency, followed by MAE. The UAE yielded significantly higher levels of total phenolic content (43.97 mg GAE/g), total flavonoid content (24.08 mg QE/g), total anthocyanin content (16.37 mg CGE/g), DPPH antioxidant activity (19.29 mg TE/g), and FRAP antioxidant activity (16.75 mg TE/g) compared to MAE and conventional extraction methods. GC-MS analysis revealed a diverse array of phytochemicals, including flavonoids, phenolic compounds, and terpenoids, with some compounds showing higher concentrations in UAE. Reverse phase HPLC profiling further confirmed the enhanced extraction of phenolic compounds using UAE, including gallic acid, caffeic acid, coumaric acid, quercetin, and kaempferol. This study reveals the efficiency, time-saving, and eco-friendliness of UAE for extracting valuable bioactive compounds from B. variegata flowers. The findings optimize extraction processes in the food, pharmaceutical, and nutraceutical industries. [Display omitted] • Bauhinia variegata flowers are underutilized, value-added food product with antioxidant potential. • Taguchi orthogonal array design was used for optimizing the extraction conditions. • The ultrasound-assisted extraction enhanced the bioactive compound yield compared with microwave-assisted and conventional extraction. • Optimized extract exhibited interesting high antioxidant activity. • The optimized extract was characterized using GC-MS to identify the chemical compounds and HPLC analysis to quantify the phenolic compounds. [ABSTRACT FROM AUTHOR]

In Northeast Brazil, the use of biomass for energy generation is settled on traditional productive arrangements, such as a sugarcane production system in the humid Atlantic coastal area and firewood extraction from native tropical dry forests in the west. In parallel, substantial amounts of other biomass sources, such as residues from agricultural or urban processes, are still little used or wholly wasted, fudging the opportunity to generate new value chains based on these biomass sources. We hypothesize that using these non-traditional biomass sources to produce biofuels would significantly increase the regional bioenergy supply. In this context, this article discusses the potential for the production and use of biofuels and bioenergy in Northeast Brazil and its effects on regional development, which may be useful for both private actors and policymakers in the energy sector. The use of biomass sources for energy in the region is significant, reaching approximately 8.8 million tons of oil equivalent (toe) per year, emphasizing the already consolidated production of sugarcane and its derivatives. The use of all biomass resources in the Northeast region could supply around 4% of the Brazilian national electrical energy demand, with an environmental footprint of 0.055 tCO2eq per toe, which would contribute to reducing emissions from the Brazilian energy matrix generation. Regarding the spatial distribution of biomass sources, sugarcane prevails on the coast, firewood and livestock manure in the dryland area towards the west, and municipal solid waste is distributed throughout the region within urban areas. Different from what we expected, the potential energy recovery from municipal waste and animal manure would increase by only 17% the current bioenergy supply. In the future, since the majority of the region presents a semi-arid climate with limited rainfall, to increase the use of biomass as an energy source, there is a need to increase the supply of biomass sources with high efficiency in water use and good yields in drylands. For this, the cultivation and use of cacti and agave, for example, could contribute to making biorefineries viable in the region. Above all, public policies for harnessing bioenergy in NE Brazil must seek opportunities associated with the carbon/decarbonization economy, with studies being needed to assess the technical, economic, social, and environmental viability of future productive arrangements.

Throughout the entire world, the biomass plant remains an important source of renewable energy. However, in Morocco, the energy recovery of this biomass is little or badly exploited compared to other solar, hydraulic, and wind resources. The aim of this study is to know the extent to which Moroccan companies are involved in the valorization of green waste and to identify among the latter those that have great energy and industrial value. The field investigation was carried out with the use of a questionnaire to different sectors of activity. The chemical analyses of the waste samples were carried out by different methods: Van Soest to investigate the fiber content, dinitrosalicylic acid and phenol-sulfuric acid to determine sugars, while the Folin–Ciocalteu method was employed for the determination of phenolic compounds. These are the ASTM standard methods to determine elemental, proximate composition, and calorific value (CV). The results of this survey showed that solid vegetable waste is diverse and represents 68.4% of the total green waste, of which 98% is not treated. Moreover, the chemical analysis displayed that forestry waste (FW), extracted parts wastes (EPW), and unused parts wastes (UPW) of medicinal and aromatic plants have high contents of cellulose (respectively 34.75, 48.44, and 54.19%) and hemicelluloses (28.44, 27.19 and 28.50%) and containing low amounts of lignin and phenolic compounds compared to olive waste (OW), olive pomace (OP), and household waste (HW). Almost all biomass wastes, except HW, have a low moisture (<12%), ash content less than 5.1%, a significant percentage of C and H, and CV between 14.5 and 21.6 MJ/Kg. The PCA analysis showed a discrepancy in terms of components between the set formed by FW, UPW, and EPW with other solid waste. In conclusion, FW, UPW, and EPW, specially can be potentially energetic biomass and valorized together in the form of a mixture. [ABSTRACT FROM AUTHOR]

5-Hydroxymethylfurfural (5-HMF) as a triply catalytic product is a value-added refining chemical in industry production. 5-HMF as biomass feedstock enables to be transformed into other high-value industrial compounds, such as 2,5-furandicarboxylic acid (FDCA), 5-hydroxymethyl-2-furancarboxylic acid (HMFCA), 5-formyl-2-furancarboxylic acid (FFCA), 2,5-diformylfuran (DFF), 2,5-bis(aminomethyl)furan (BAMF), and 2,5-dimethylfuran (DMF). Hence, catalytic conversion of biomass into 5-HMF has been given much more attention by chemists. In this review, some latest studies about the conversion of cellulose to 5-HMF have been introduced systematically. Solid acids such as heterogeneous catalysts have been widely applied in the conversion of cellulose into 5-HMF. Therefore, some novel solid acids with Brønsted and/or Lewis acidic sites, such as sulfonated solid acids, carbon-based acids, and zeolite particles employed for biomass conversions are listed.

Feedstock cost and cost variability is expected to increase with the number of biorefineries. To quantify this effect, this spatial‐economic analysis simulates feedstock cost and cost variability of an industry based on corn stover as a function of the number of biorefineries. Results are reported for nine scenarios (a base case and sensitivity analysis of four variables – harvest efficiency, sustainability constraints, opportunity cost, and corn grain yield) under deterministic and stochastic simulations, assuming biorefineries using 658 000 Mg (725 000 tons) year−1 of corn stover in 2019. The resulting supply curves are highly elastic (i.e. little change in cost) for the first 50 of the 121 biorefineries, with price increases in subsequent biorefineries depending on scenario. In the base‐case deterministic scenario, weighted‐average stover costs are $66 Mg−1 ($60 ton−1), $69 Mg−1 ($62 ton−1), and $156 Mg−1 ($142 ton−1), at the first, 60th, and 121st biorefineries, respectively. The stochastic simulations, subject to observed 30‐year corn yield variability, follow a similar pattern, with price distributions that vary by scenario. The base‐case stochastic simulations illustrate minimal cost variability for the first 60 biorefineries, but rapid increases in cost variability in the second half of potential biorefineries, with similar patterns observed in the other scenarios. Of the four variables explored, price was most sensitive to harvest efficiency, followed by sustainability constraints, corn yield, and opportunity cost. Results suggest that, under conventional logistics, about half of the US corn stover resource is reliably available with minimum cost increase and variability. Interactive visualization is available at https://doi.org/10.11578/1828779. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd [ABSTRACT FROM AUTHOR]

Bioenergy production from biomass is a multicriteria decision-making (MCDM) problem involving multidimensional criteria due to the vast range of resources available for consideration. In this paper, we propose a hybrid fuzzy technique for order preference by similarity to ideal solution (FTOPSIS) and analytical hierarchy process (AHP) that is able to tackle vagueness and ambiguity in data and produce weights for all criteria in the MCDM problem. By utilizing this methodology, different aspects of experts' data evaluation including fuzzy values can be converted into crisp values. Accuracy in each decision matrix is ensured by determining the weights of the subcriteria. We then apply the model to sustainable biomass resource selection in Ghana. Specifically, we comprehensively review the sustainable criteria within the bioenergy domain namely social, environmental, and economic aspects together with thirteen subcriteria. The proposed model was applied to biomass resource alternatives including crop residue, animal manure, forest residue, energy crops, and municipal solid waste. Results show the weights of thirteen subcriteria to be within the range of 0.10340 and 0.05263. The FTOPSIS shows that animal manure may be the most desirable resource for bioenergy production in Ghana, followed by energy crop, municipal solid waste, forest residue, and crop residue, respectively. Engineering and energy planning problems with conflicting multicriteria data can be easily solved by using this proposed hybrid AHP/FTOPSIS framework. [ABSTRACT FROM AUTHOR]

The first aim of the present study is to investigate the feasibility of the biogas production potential from Spent Mushroom Compost. Hence, its secondary aim is to study the replacement of this energy with the fossil energy source and its impact on the reduction of greenhouse gases emission. The production potential of biogas was evaluated in a laboratory-scale Open Outlet Flow Batch Type Anaerobic digester. Setups of biogas production were set at temperatures of 35°C and 55°C. Results indicate that the cumulative production of biogas at 55°C was more than that at 35°C (364.8 and 314.11 L/kg.VS, respectively). The energy required for 1 ton of spent mushroom compost in one period of production was 204.24–5.35T kW.h/ton. The amount of energy produced in a period of biogas production was calculated to be 277.95 kW.h/ton at 35°C and 322.84 kW.h/ton at 55°C. Results show that the total produced spent mushroom compost of the country is equal to 414,491.7 tons per year. Accordingly, the potential of methane production was calculated to be 8690.8 × 103 m3 per year. It can also reduce 0.02% of the total annual production of CO2 in Iran.

Biomass wastes are abundant around us. They are renewable and inexpensive. Product manufacturing from renewable resources has caught increasing interest recently. Activated carbon preparation from biomass resources, including various trees, leaves, plant roots, fruit peels, and grasses, is a good example. In this paper, an overview of activated carbon production from biomass resources will be given. The first part will be on the processing technologies. The second part will focus on the carbon activation methods. The third part will introduce the biomass resources. The fourth part will be on surface modification of activated carbon through the addition of various components. Finally, the development of product applications will be discussed with an emphasis on adsorption, filtration, water purification, energy conversions, and energy storage. [ABSTRACT FROM AUTHOR]

Sugarcane bagasse (SCB) is a major by-product of the sugarcane industry and one of the most common renewable and sustainable cellulosic materials for various industrial applications. As the world moves toward bioeconomy and green chemistry for sustainable growth, SCB is seen as a valuable bioresource. The cellulose component of SCB at 40–50% serves as a precursor for producing value-added products such as cellulose nanocrystals, cellulose nanofibers and microcrystalline cellulose. Some applications of cellulosic materials from SCB, emerging markets and future prospects in the nanocellulose industry are discussed. Most studies on cellulose from SCB focused only on the extraction and isolation of micro and nanomaterials. This presents opportunity for researchers and industry players to invest efforts and capital into further applications of cellulosic materials from SCB, as a renewable and sustainable product source. [ABSTRACT FROM AUTHOR]

Iran is considered one of the most polluted countries in the world, where major cities have consistently dealt with severe air pollution in recent decades. Fossil fuels account for a considerable portion of greenhouse gas (GHG) emissions in urban areas of Iran. Biofuels have been touted as an effective means of reducing urban air pollution. Since biofuels are largely compatible with the vehicles in Iran, they can be blended with the fossil fuels currently produced in the country as a feasible solution to the pollution crisis. This paper investigates the potential of second-generation biofuel development in Iran. First, potential biofuel resources are identified in each province. Next, the agro-ecological and climatic conditions of Iran for biomass production are evaluated. Lastly, the challenges and opportunities associated with biofuel production are discussed. The resulting managerial insights indicate that agricultural residues and energy crops are the most suitable resources for biofuel production. [ABSTRACT FROM AUTHOR]

Heavy metal ions in wastewater have negative effects on humans and the environment. In this paper, the adsorption of lead and copper ions by modified eucalyptus lignin nanosphere (ECLNPs) was studied. The spherical alkali-lignin particles had a diameter of 50 nm, abundant carboxyl groups of 0.66 mmol/g, and relatively high adsorption performance. The equilibrium adsorption capacities of Pb(II) and Cu(II) by ECLNPs were 126.0 mg/g and 54.4 mg/g, respectively. Both Pb(II) and Cu(II) adsorptive processes fitted a pseudo-second-order kinetics model. In the simultaneous adsorption process of Pb(II) and Cu(II), ECLNPs had higher adsorptive selectivity for Pb(II) than Cu(II), and there was a competitive adsorption process between Pb(II) and Cu(II). This resulted from the lower hydration heat of Pb(II) in water, which leads to easier separation from water ligands. ECLNPs also showed good recyclability, with 16.6% and 21.1% loss in Pb(II) and Cu(II) adsorption capacity, respectively, after three consecutive adsorption-desorption cycles, which provides a feasible technical direction for the utilization of biomass resources and the treatment of water contamination. [ABSTRACT FROM AUTHOR]

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With the growing emphasis on environmental conservation, the utilization of biomass resources has garnered increasing attention. Dimer acid, derived from vegetable oils, serves as a high-quality chemical raw material while the waste lower purity dimer acid (WLPDA) will result in environmental pollution and resource wastage. In this work, WLPDA was employed as a surface modifier for calcium carbonate (CaCO 3) particles with the aim of toughening of poly(lactic acid) (PLA). The addition of WLPDA demonstrates excellent modifying effects on CaCO 3 , achieving an activation index of 100% and an increased contact angle from 14° to around 120°. Furthermore, the PLA/WLPDA modified CaCO 3 (D-CaCO 3) composites exhibit noticeably toughening effects, with a maximum increase of 87% in impact strength. The improvement can be attributed to the favorable plastic deformation of interparticle ligaments following particle-matrix debonding and the long aliphatic chains of WLPDA. This research highlights the viability of replacing stearic acid with WLPDA as the surface modifier for inorganic fillers, providing a promising alternative for the toughening modification of polymers. Additionally, it presents a novel approach for the comprehensive utilization of dimer acid biomass resources. [Display omitted] • Recycling of WLPDA as a surface treatment agent for inorganic particles not only conserves valuable carbon resources but also contributes to environmental preservation. • WLPDA-treated CaCO 3 enhances its compatibility and dispersion within PLA. • The debonding-void toughening mechanism of inorganic particles within polymer matrices is further elucidated. [ABSTRACT FROM AUTHOR]

A series of metal-TS-1 zeolite catalysts were designed to selectively catalyze the photo oxidation of furfural to C 4 carboxylic acid derivatives at ambient temperature and pressure. The photocatalytic preparation of malic acid from furfural was realized for the first time. The selective distribution of products could be controlled by adjusting the physical and chemical characteristics of the catalyst. Smaller pore size prevented the further conversion of maleic acid to malic acid; moderate acidity was beneficial for the preparation of malic acid; lower valence band was in favor of maleic acid production while higher valence band tended to form malic acid. The synergistic effect of pore structure, acidity and energy band structure of catalysts affected the product distribution. The yield of maleic acid reached as high as 40% over Fe-TS-1, meanwhile, the yield of malic acid reached as high as 63% over Ni-TS-1. The doping of metal was believed to be an effective procedure to adjust the structure and physicochemical properties of zeolite. Matel-TS-1 zeolite was also expected to be widely used in photocatalytic system to achieve more selective reactions. [Display omitted] • A series of metal-TS-1 zeolite catalysts were prepared and characterized. • The acidity and redox potential of metal-TS-1 zeolite catalysts could be adjusted by altering the type of doping metal. • Selective photo-oxidation of furfural to produce C 4 carboxylic acid products were realized under ambient conditions. • Product selectivity was synergistically determined by the grain size, pore size, acidity and redox potential of catalysts. [ABSTRACT FROM AUTHOR]

People are relying upon oil for primary energy and this will continue for a few more decades. Other conventional sources may be more enduring, but are not without serious disadvantages. The renewable energy resources are particularly suited for the provision of rural power supplies and a major advantage is that equipment such as flat plate solar driers, biomass technologies, wind machines, etc., can be constructed using local resources. Without the advantage results from the feasibility of local maintenance and the general encouragement such local manufacture gives to the buildup of small-scale rural based industry. Biomass is an important material for the sustainable source of energy. It can generate solid, liquid and gaseous products under different Thermochemical conversion technologies. Two products namely, bio-oil and charcoal were produced and their characteristics were analysed. There is a need for some further development to suit local conditions, to minimise spares holdings, to maximise the interchangeability of the engine parts, and of the engine applications. Emphasis should be placed on full local manufacture. It is concluded that renewable environmentally friendly energy must be encouraged, promoted, implemented and demonstrated by a full-scale plant (device) especially for use in remote rural areas. This communication discusses a comprehensive review of biomass energy sources, environment and sustainable development. This includes all the biomass energy technologies, energy efficiency systems, energy conservation scenarios, energy savings and other mitigation measures necessary to reduce emissions globally. The current literature is reviewed regarding the ecological, social, cultural and economic impacts of biomass technology. This study gives an overview of present and future use of biomass as an industrial feedstock for production of fuels, chemicals and other materials. However, to be truly competitive in an open market situation, higher value products are required.

The understanding of the geographical variability of biomass energy is an essential requirement for the optimal location of biomass energy conversion plants. This research presents a multicriteria GIS-based assessment of biomass energy potentials and the appropriate siting of biomass plants in Nigeria. The study applies the weighted overlay multicriteria decision analysis method. Crop and forest areas, settlement (energy supply areas), shrub/grasslands, barren land, water bodies, distance from water sources, road accessibility, topography, and aspect are the criteria that were considered for locating a biomass facility in this study. The results suggest that the theoretical, technical, and economical energy potentials of crop residues are highest in the North-East region of Nigeria and estimated at 1,163.32, 399.73, and 110.56 PJ/yr, respectively, and lowest in the South-East at 52.36, 17.99, and 4.98 PJ/yr, respectively. The theoretical, technical, and economical energy potentials of forest residues are highest in the North-West, estimated at 260.18, 156.11, and 43.18 PJ/yr, respectively, and lowest in the South-East at 1.79, 1.08, and 0.30 PJ/yr, respectively. Although most areas were identified to be suitable for siting biomass plants across Nigeria, the most suitable areas are located in the northern part of the country and include Niger, Zamfara, the Federal Capital Territory, Nassarawa, Kano, Kebbi, Kaduna, and Borno State. The study supports the Nigerian bio-energy policy that proposes to effectively utilize Nigeria's non-fuelwood as a substitute for the felling of trees. This is very important to strengthen its commitment at the COP26 International Climate Conference, which is to conserve and restore its forest. Furthermore, this study will serve as a good reference for policymakers to make well-informed decisions on tackling the energy insecurity in Nigeria., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Ukoba, Diemuodeke, Briggs, Ojapah, Okedu, Owebor, Akhtar and Ilhami.)

Biomass wastes are abundant around us. They are renewable and inexpensive. Product manufacturing from renewable resources has caught increasing interest recently. Activated carbon preparation from biomass resources, including various trees, leaves, plant roots, fruit peels, and grasses, is a good example. In this paper, an overview of activated carbon production from biomass resources will be given. The first part will be on the processing technologies. The second part will focus on the carbon activation methods. The third part will introduce the biomass resources. The fourth part will be on surface modification of activated carbon through the addition of various components. Finally, the development of product applications will be discussed with an emphasis on adsorption, filtration, water purification, energy conversions, and energy storage.

Four types of Vietnamese waste biomass were investigated for bio-oil production using the fast pyrolysis technology. Feedstock chemical composition, product yields, and bio-oil physical properties have been systematically compared. The chemical composition and properties of Vietnamese resources of biomass are similar to those of the other biomass. The experimental results showed that all obtained bio-oils fulfilled the specifications for pyrolysis liquid defined as ASTM D7544-12 Standard. The biomass composition has strong impact on product yields, especially bio-oil formation. Higher contents of the three main components in the feedstock (i.e., cellulose, hemicellulose, and lignin) lead to a higher yield of bio-oil, whereas its high ash content caused a decrease in the bio-oil yield. As a result, the bio-oil yields from feedstock are in the following order: bagasse > corn cob > rice husk > rice straw. In addition, pyrolysis conditions (e.g., temperature and nitrogen flowrate), but not biomass preparation (e.g., material particle size), influence the bio-oil yield and its properties, as well. However, it has been found that this influence for rice husk and rice straw feedstocks is more prominent than for bagasse and corn cob. Finally, a strategy for an efficient usage of various waste resources for future biorefineries was proposed. [ABSTRACT FROM AUTHOR]

Cheap and efficient carbon electrodes (CEs) for energy storage systems (ESS) such as supercapacitors (SCs) and batteries are an increasing priority issue, among other things, due to a globally increasing share of intermittent electricity production (solar and wind) and electrification of transport. The increasing consumption of portable and non-portable electronic devices justifies research that enables environmentally and economically sustainable production (materials, processing techniques, and product design) of products with a high electrochemical performance at an acceptable cost. Among all the currently explored CEs materials, biomass-based activated carbons (AC) present enormous potential due to their availability and low-cost, easy processing methods, physicochemical stability, and methods for self-doping. Nitrogen doping methods in CEs for SCs have been demonstrated to enhance its conductivities, surface wettability, and induced pseudocapacitance effect, thereby delivering improved energy/power densities with versatile properties. Herein, a short review is presented, focusing on the different types of natural carbon sources for preparing CEs towards the fabrication of SCs with high electrochemical performance. The influences of ACs’ pore characteristics (micro and mesoporosity) and nitrogen doping on the overall electrochemical performance (EP) are addressed.

Agriculture residue is a promising resource of energy. It can be seen as a source of power production. In India, there is a huge amount of biomass available, but it cannot be used in proper ways, and with the help of GIS it can be customised. In the present paper, it is estimated that biomass reserves are available for power generation. The biomass produced by the surplus agricultural crops is reflected as a source of fuel for electricity generation. The data taken by satellite are useful for assessment of the areas with the help of satellite images taken in high resolution, which increases the preciseness of estimation. An agriculture cropland map with agricultural statistics has been analyzed in GIS to discover the agricultural straw potential for bioenergy generation. Due to unawareness about the benefits and uses of GIS, the modern farming sector bears a loss of huge bioenergy potential every year. To overcome the above mentioned challenges, the agricultural system needs a major shift from conventional farming to smart farming practices with the help of GIS. Agricultural waste is the best source for bioenergy production, and it can be used as biomass for meeting renewable energy goals in the country.

In this study, in order to obtain high concentration bioethanol, reed pretreated with liquid hot water and ammonia oxygen (LHW-NH 3 ·H 2 O/O 2) was used as the substrate for fermentation. Enzymatic hydrolysis becomes difficult by the ineffective lignin adsorption and the decline in cellulase activity. It is worth noting that even under low enzyme loading (9 FPU/g pretreated solid), this study was able to maintain a higher glucan conversion rate (97.60%). In addition, under high solid loading conditions, the combined effect of PEG 6000 and rhamnolipids increased ethanol yield (78.40%) and ethanol concentration (71.5 g/L). The combined LHW-NH 3 ·H 2 O/O 2 pretreatment with fed-batch semi-simultaneous saccharification and fermentation technique may be utilized to industrialize the production of bioethanol from reed since we concentrated on the maximum exploitation of biomass resources and reduction in energy consumption. [Display omitted] • LHW–NH 3 ·H 2 O/O 2 pretreatment is a cheap, eco-friendly, and effective technique. • With the help of surfactant, enzyme loading (9 FPU/g-PSs) decreased by 40%. • The maximum glucan conversion could reach 97.60%. • The main components of reed were isolated and put to high-value uses. • Two surfactants work together to produce high bioethanol concentration and yield. [ABSTRACT FROM AUTHOR]

Carbon emissions and associated global warming have become a threat to the world, the major contributor being the extensive use of fossil fuels and uncontrolled generation of solid wastes. Energy generation from renewable energy sources is considered an alternative to achieving carbon neutrality. Anaerobic digestion (AD) is a sustainable technology that has been endorsed as a low-carbon technology complimenting both waste management and renewable energy sectors. The AD technology recovers the volatile matter from waste biomass as much as possible to produce biogas, thus reducing carbon emission as compared to open dumping or burning. However, there is a need of compilation of information on how each subsystem in AD contributes to the overall carbon neutrality of the entire system and chances of achieving a circular economy along with it. Therefore, this article aims to clarify the associated internal and external factors that determine the low carbon characteristic of anaerobic digestion technology. From this review, the potential of AD system for energy-atmosphere-agriculture nexus has been explored. Carbon emission mapping of the potential entities involved in AD were identified and perspective to life cycle assessment and future research direction has been pointed out. Climate change impact and acidification potential are the two entities that can influence the overall environmental sustainability of an AD system. It was recognized that each stage of AD system starting from substrate supply chain, biogas production, upgradation, utilization, and digestate application had a remarkable effect on the overall carbon emission potential based on its design, operation, and maintenance. Selection of suitable substrates and co-digesting them together for improved biogas production rate with high methane content and proper digestate post-processing and storage can vastly reduce the carbon emission potential of the AD technology. Further, a case scenario of India was assessed considering the utilization of major surplus biomass available through AD. Re-routing the three major substrates such as agricultural crop residues, animal wastes and organic fraction of municipal solid wastes through AD can reduce at least 3.5–3.8 kg CO 2-eq per capita of annual carbon emission load in India. Furthermore, the pathways in which the policy and legislations over establishment of AD technology and how to explore linkages between achieving circular economy and low carbon economy for Indian scenario has been highlighted. • The carbon recovery potential of anaerobic digestion (AD) technology is reviewed. • The benefits of AD for energy-agriculture-atmosphere nexus are discussed. • Coverage area and digestate handling segments significantly influences the low carbon nature of AD. • With the current research, AD has the potential to reduce up to 4 kg per capita of CO2-eq. • The role of AD for creating a low carbon circular economy model is highlighted. [ABSTRACT FROM AUTHOR]