16 results on '"Fulignati, S."'
Search Results
2. A novel organosolv approach to allow efficient biomass fractionation and successive exploitation
- Author
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Raspolli Galletti, A. M., Licursi, D., Di Fidio, N., Fulignati, S., Baldassari, R., Parajò, J. C., Rivas, S., and Antonetti, C.
- Subjects
organosolv, biomass, butyl levulinate ,biomass ,organosolv ,butyl levulinate - Published
- 2022
3. Biomass-derived catalysts: synthesis and characterization of hydrochars and pyrochars
- Author
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Antonetti, C., Licursi, D., Bertini, B., Di Fidio, N., Fulignati, S., and Raspolli Galletti, A. M.
- Subjects
hydrochars ,pyrochars ,levulinic acid ,hydrochars, pyrochars, levulinic acid - Published
- 2022
4. Sustainable exploitation of paper mill wastes: a resource to re-use in the paper factory
- Author
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Lorè, R., Guido, Pasquini, Maurizio, Giordano, Antonetti, C., Di FIDIO, N., Fulignati, S., Licursi, D., and RASPOLLI GALLETTI, A. M.
- Subjects
paper mill wastes ,paper mill wastes, sustainable exploitation, thermal/alkaline/mechanical treatments ,thermal/alkaline/mechanical treatments ,sustainable exploitation - Published
- 2022
5. Catalytic hydrogenation of crude hexanoic acid, easily obtained by anaerobic fermentation of grape pomace
- Author
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Licursi, D., Antonetti, C., Di Fidio, N., Fulignati, S., Emma Jones, Martinez, G. A., Fava, F., Bertin, L., and Galletti, A. M. R.
- Subjects
Liquid biofuel ,Biobased products, Biorefinery, Fermentation, Reduction, Liquid biofuel ,Fermentation ,Biomass ,Biobased products ,Biorefinery ,Reduction - Abstract
The transition from fossil resources to renewable ones represents an urgent need. Biomasses are promising feedstocks, potentially exploitable through novel bio-catalytic processes, such as acidogenic fermentation to carboxylic acids, which can be further converted into more value-added bio-products through cascade chemical approaches, such as hydrogenation to corresponding alcohols/esters. In this work, the optimization of the hydrogenation of commercial hexanoic acid to 1-hexanol and hexyl hexanoate was first investigated. For this purpose, 5 wt% Re/C resulted active and selective towards 1-hexanol production. The same catalyst was further tested for the hydrogenation of crude hexanoic acid, obtained by fermentation of red and white grape pomaces. Hydrogenation of these crude hexanoic acid mixtures confirmed the promising performances of 5 wt% Re/C, achieving the complete substrate conversion with a prevailing selectivity to 1-hexanol (~58 mol%), rather than to hexyl hexanoate (~30 mol%). Moreover, the use of an acid support, such as Al2O3, markedly shifted the selectivity towards hexyl hexanoate (~51 mol%). This observation was further demonstrated by testing physical mixtures of 5 wt% Re/C and different amounts of acidic niobium phosphate. Based on these promising results, exploitation of grape pomace for 1-hexanol/hexyl hexanoate production, to use as bio-fuels or bio-solvents, represents a smart possibility., Proceedings of the 30th European Biomass Conference and Exhibition, 9-12 May 2022, Online, pp. 494-500
- Published
- 2022
6. Integrated Cascade Process for the Catalytic Conversion of 5-Hydroxymethylfurfural to Furanic and TetrahydrofuranicDiethers as Potential Biofuels
- Author
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Claudia Antonetti, Sara FULIGNATI, Tommaso Tabanelli, FABRIZIO CAVANI, Anna Maria Raspolli Galletti, Fulignati S., Antonetti C., Tabanelli T., Cavani F., and Raspolli Galletti A.M.
- Subjects
5-hydroxymethylfurfural ,Ethanol ,General Chemical Engineering ,furan ether ,heterogeneous catalysis ,hydrogenation ,tetrahydrofuran ether ,General Energy ,Biofuel ,Biofuels ,heterogeneous catalysi ,Furan ,Environmental Chemistry ,General Materials Science ,Furaldehyde ,Furans - Abstract
The depletion of fossil resources is driving the research towards alternative renewable ones. Under this perspective, 5-hydroxymethylfurfural (HMF) represents a key molecule deriving from biomass characterized by remarkable potential as platform chemical. In this work, for the first time, the hydrogenation of HMF in ethanol was selectively addressed towards 2,5-bis(hydroxymethyl)furan (BHMF) or 2,5-bis(hydroxymethyl)tetrahydrofuran (BHMTHF) by properly tuning the reaction conditions in the presence of the same commercial catalyst (Ru/C), reaching the highest yields of 80 and 93 mol%, respectively. These diols represent not only interesting monomers but strategic precursors for two scarcely investigated ethoxylated biofuels, 2,5-bis(ethoxymethyl)furan (BEMF) and 2,5-bis(ethoxymethyl)tetrahydrofuran (BEMTHF). Therefore, the etherification with ethanol of pure BHMF and BHMTHF and of crude BHMF, as obtained from hydrogenation step, substrates scarcely investigated in the literature, was performed with several commercial heterogeneous acid catalysts. Among them, the zeolite HZSM-5 (Si/Al=25) was the most promising system, achieving the highest BEMF yield of 74 mol%. In particular, for the first time, the synthesis of the fully hydrogenated diether BEMTHF was thoroughly studied, and a novel cascade process for the tailored conversion of HMF to the diethyl ethers BEMF and BEMTHF was proposed.
- Published
- 2022
7. Optimisation of glucose and levulinic acid production from the cellulose fraction of giant reed (Arundo donax L.) performed in the presence of ferric chloride under microwave heating
- Author
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Sara Fulignati, Anna Maria Raspolli Galletti, Nicola Di Fidio, Isabella De Bari, Claudia Antonetti, Di Fidio, N., Fulignati, S., De Bari, I., Antonetti, C., and Raspolli Galletti, A. M.
- Subjects
0106 biological sciences ,FeCl ,Environmental Engineering ,Giant reed, Glucose, Levulinic acid, FeCl3, Response surface methodology ,Bioengineering ,010501 environmental sciences ,Poaceae ,Ferric Compounds ,01 natural sciences ,Catalysis ,Heating ,chemistry.chemical_compound ,Hydrolysis ,Chlorides ,Levulinic acid ,Response surface methodology ,FeCl3 ,010608 biotechnology ,Enzymatic hydrolysis ,Hemicellulose ,Cellulose ,Microwaves ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Glucan ,chemistry.chemical_classification ,Giant reed ,Renewable Energy, Sustainability and the Environment ,General Medicine ,Levulinic Acids ,Glucose ,chemistry ,Yield (chemistry) ,Nuclear chemistry - Abstract
A two-step exploitation of the giant reed cellulose to glucose and levulinic acid, after the complete removal of the hemicellulose fraction, was investigated using FeCl3 as catalyst. In the first step, the microwave-assisted hydrolysis of cellulose to glucose was optimised by response surface methodology analysis, considering the effect of temperature, reaction time and catalyst amount. Under the optimised reaction conditions, the glucose yield was 39.9 mol%. The cellulose-rich residue was also converted by enzymatic hydrolysis, achieving the glucose yield of 39.8 mol%. The exhausted residue deriving from the chemical hydrolysis was further converted to levulinic acid by microwave treatment at harsher reaction conditions. The maximum levulinic acid yield was 64.3 mol%. On the whole, this cascade approach ensured an extensive and sustainable exploitation of the C6 carbohydrates to glucose and levulinic acid, corresponding to about 70 mol% of glucan converted to these valuable bioproducts in the two steps.
- Published
- 2020
8. Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route
- Author
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Anna Maria Raspolli Galletti, Claudia Antonetti, Domenico Licursi, Isabella De Bari, Sara Fulignati, Nicola Di Fidio, Federico Liuzzi, Di Fidio, N., Galletti, A. M. R., Fulignati, S., Licursi, D., Liuzzi, F., De Bari, I., and Antonetti, C.
- Subjects
Arundo donax L ,Biomass ,Lignocellulosic biomass ,02 engineering and technology ,Xylose ,lcsh:Chemical technology ,01 natural sciences ,Catalysis ,lcsh:Chemistry ,chemistry.chemical_compound ,Second-generation sugars ,Organic chemistry ,lcsh:TP1-1185 ,Hemicellulose ,Physical and Theoretical Chemistry ,Cellulose ,Microwaves ,Cascade biomass exploitation ,microwaves ,Amberlyst-70 ,second-generation sugars ,high gravity approach ,chemical and enzymatic hydrolysis ,cascade biomass exploitation ,biology ,010405 organic chemistry ,Arundo donax ,021001 nanoscience & nanotechnology ,biology.organism_classification ,0104 chemical sciences ,lcsh:QD1-999 ,chemistry ,Chemical and enzymatic hydrolysis ,Yield (chemistry) ,Chemical and enzymatic hydrolysi ,High gravity approach ,arundo donax l ,0210 nano-technology ,Microwave - Abstract
Lignocellulosic biomass represents one of the most important feedstocks for future biorefineries, being a precursor of valuable bio-products, obtainable through both chemical and biological conversion routes. Lignocellulosic biomass has a complex matrix, which requires the careful development of multi-step approaches for its complete exploitation to value-added compounds. Based on this perspective, the present work focuses on the valorization of hemicellulose and cellulose fractionsof giant reed (Arundo donax L.) to give second-generation sugars, minimizing the formation of reaction by-products. The conversion of hemicellulose to xylose was undertaken in the presence of the heterogeneous acid catalyst Amberlyst-70 under microwave irradiation. The effect of the main reaction parameters, such as temperature, reaction time, catalyst, and biomass loadings on sugars yield was studied, developing a high gravity approach. Under the optimised reaction conditions (17 wt% Arundo donax L. loading, 160 °, C, Amberlyst-70/Arundo donax L. weight ratio 0.2 wt/wt), the xylose yield was 96.3 mol%. In the second step, the cellulose-rich solid residue was exploited through the chemical or enzymatic route, obtaining glucose yields of32.5 and56.2 mol%, respectively. This work proves the efficiency of this innovative combination of chemical and biological catalytic approaches, for the selective conversion of hemicellulose and cellulose fractions of Arundo donax L. to versatile platform products.
- Published
- 2020
9. Beach-cast seagrass wrack: A natural marine resource improving the establishment of dune plant communities under a changing climate.
- Author
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Menicagli V, Balestri E, Bernardini G, Barsotti F, Fulignati S, Raspolli Galletti AM, and Lardicci C
- Subjects
- Poaceae, Seedlings, Natural Resources, Climate Change, Water, Plants, Ecosystem
- Abstract
Seagrass wrack plays multiple ecological roles in coastal habitats but is often removed from beaches and used for economical processing, neglecting its potential role in sustaining dune plant establishment under changing climate scenarios. Rainwater shortage is a major stress for seedlings and reduced precipitations are expected in some coastal areas. We investigated in mesocosm how wrack influenced seedling performance of Cakile maritima, Thinopyrum junceum, and Calamagrostis arenaria under current and reduced precipitation. We also assessed wrack water holding capacity and leachate chemical/physical properties. Wrack stimulated seedling growth while reduced precipitation decreased root development. Wrack mitigated the effects of reduced precipitation on T. junceum and C. arenaria biomass. Wrack retained water up to five-fold its weight, increased water pH, conductivity, and nutrient content. Wrack promotes dune colonization by vegetation even under rainwater shortage. Thus, the maintenance of this natural resource on beaches is critical for improving dune resilience against climate changes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
10. Challenges and Opportunities in the Catalytic Synthesis of Diphenolic Acid and Evaluation of Its Application Potential.
- Author
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Fulignati S, Di Fidio N, Antonetti C, Raspolli Galletti AM, and Licursi D
- Abstract
Diphenolic acid, or 4,4-bis(4-hydroxyphenyl)pentanoic acid, represents one of the potentially most interesting bio-products obtainable from the levulinic acid supply-chain. It represents a valuable candidate for the replacement of bisphenol A, which is strongly questioned for its toxicological issues. Diphenolic acid synthesis involves the condensation reaction between phenol and levulinic acid and requires the presence of a Brønsted acid as a catalyst. In this review, the state of the art related to the catalytic issues of its synthesis have been critically discussed, with particular attention to the heterogeneous systems, the reference benchmark being represented by the homogeneous acids. The main opportunities in the field of heterogeneous catalysis are deeply discussed, as well as the bottlenecks to be overcome to facilitate diphenolic acid production on an industrial scale. The regioselectivity of the reaction is a critical point because only the p , p '-isomer is of industrial interest; thus, several strategies aiming at the improvement of the selectivity towards this isomer are considered. The future potential of adopting alkyl levulinates, instead of levulinic acid, as starting materials for the synthesis of new classes of biopolymers, such as new epoxy and phenolic resins and polycarbonates, is also briefly considered.
- Published
- 2023
- Full Text
- View/download PDF
11. Conversion of the hydrochar recovered after levulinic acid production into activated carbon adsorbents.
- Author
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Licursi D, Antonetti C, Di Fidio N, Fulignati S, Benito P, Puccini M, Vitolo S, and Raspolli Galletti AM
- Subjects
- Levulinic Acids, Methylene Blue, Adsorption, Charcoal chemistry, Cellulose
- Abstract
Levulinic acid production by acid-catalyzed hydrothermal conversion of (ligno)cellulosic biomass generates significant amounts of carbonaceous hydrochar, which is currently considered a final waste. In this work, the hydrochar recovered after the levulinic acid production, was subjected to cascade pyrolysis and chemical activation treatments (by H
3 PO4 or KOH), to synthesize activated carbons. The pyrolysis post-treatment was already effective in improving the surface properties of the raw hydrochar (Specific Surface Area: 388 m2 /g, VP : 0.22 cm3 /g, VMESO : 0.07 cm3 /g, VMICRO : 0.14 cm3 /g), by removing volatile compounds. KOH activation resulted as the most appropriate for further improving the surface properties of the pyrolyzed hydrochar, showing the best surface properties (Specific Surface Area: 1421 m2 /g, VP : 0.63 cm3 /g, VMESO : 0.10 cm3 /g, VMICRO : 0.52 cm3 /g), which synergistically makes it a promising system towards adsorption of CO2 (∼90 mg/g) and methylene blue (∼248 mg/g). In addition, promising surface properties can be achieved after direct chemical activation of the raw hazelnut shells, preferably by H3 PO4 (Specific Surface Area: 1918 m2 /g, VP : 1.34 cm3 /g, VMESO : 0.82 cm3 /g, VMICRO : 0.50 cm3 /g), but this choice is not the smartest, as it does not allow the valorization of the cellulose fraction to levulinic acid. Our approach paves the way for possible uses of these hydrochars originating from the levulinic acid chain for new environmental applications, thus smartly closing the biorefinery loop of the hazelnut shells., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
- Full Text
- View/download PDF
12. Plastic litter in coastal sand dunes: Degradation behavior and impact on native and non-native invasive plants.
- Author
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Menicagli V, Balestri E, Fulignati S, Raspolli Galletti AM, and Lardicci C
- Subjects
- Humans, Ecosystem, Plant Development, Introduced Species, Plastics, Sand
- Abstract
Pollution associated to marine plastic litter is raising increasing concerns due to its potential harmful effects on human health, biota, and coastal ecosystems. However, limited information is available on the degradation behavior of plastics, especially biodegradable ones, in dune habitats. Moreover, the effects of plastics on dune plant growth and ability to withstand environmental stresses and invasion by non-native plants have been largely neglected. This is a particularly relevant issue since biological invasions are major threats to dune ecosystems. In this 18-month study, we examined the degradation behavior of two plastic bags, non-biodegradable (NBP) or biodegradable/compostable (BP), in the dune environment by visual observations and analytical techniques. Concomitantly, we investigated the individual and combined effects of bag type and sand burial (no burial vs. partial burial) on the performance of a native dune plant (Thinopyrum junceum) and an invasive plant (Carpobrotus sp.) and on their interaction. NBP did not show relevant degradation signs over the experimental period as expected. BP exhibited gradual surface modifications and changes in chemical functionality and were almost disintegrated after 18 months. Bags and burial reduced independently T. junceum survival and growth, and most plants died within 8 months of plastic exposure. Bags and burial did not affect Carpobrotus survival. However, burial decreased Carpobrotus growth while NBP increased it. Both plastics increased Carpobrotus competitive ability, and no T. junceum plants survived to co-occurrent Carpobrotus, BP, and burial. These findings indicate that removing all littered plastics from beach-dune systems not only is critical to reduce plastic pollution but also to prevent further spread of invasive species in coastal dunes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
13. Sustainable Valorisation and Efficient Downstream Processing of Giant Reed by High-Pressure Carbon Dioxide Pretreatment.
- Author
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Di Fidio N, Tozzi F, Martinelli M, Licursi D, Fulignati S, Antonetti C, and Raspolli Galletti AM
- Subjects
- Glucans, Glucose, Oligosaccharides chemistry, Xylans, Carbon Dioxide, Xylose
- Abstract
This work investigated the catalytic high-pressure CO
2 pretreatment of giant reed. CO2 is a renewable resource; its use does not generate chemical wastes and it can be easily removed and recycled. The effect of the addition of low concentrations of FeCl3 (0.16 wt %) and PEG 400 (1.0 wt %) on the hemicellulose hydrolysis to xylose and xylo-oligosaccharides (XOS) is reported for the first time. Under the optimised pretreatment conditions, the xylan conversion of 82 mol % and xylose and XOS yields of 43 and 20 mol % were achieved, respectively. The solid residues obtained from different pretreatments were used as the substrate for the enzymatic hydrolysis to give glucose. The total glucose yield achieved under the optimised two-step process was 67.8 mol % with respect to the glucan units in the biomass. The results demonstrated that PEG-assisted FeCl3 -catalysed scCO2 pretreatment can produce xylose- or XOS-rich hydrolysates and improve the enzymatic hydrolysis of biomass., (© 2022 The Authors. ChemPlusChem published by Wiley-VCH GmbH.)- Published
- 2022
- Full Text
- View/download PDF
14. Integrated Cascade Process for the Catalytic Conversion of 5-Hydroxymethylfurfural to Furanic and TetrahydrofuranicDiethers as Potential Biofuels.
- Author
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Fulignati S, Antonetti C, Tabanelli T, Cavani F, and Raspolli Galletti AM
- Subjects
- Ethanol, Furans chemistry, Biofuels, Furaldehyde analogs & derivatives, Furaldehyde chemistry
- Abstract
The depletion of fossil resources is driving the research towards alternative renewable ones. Under this perspective, 5-hydroxymethylfurfural (HMF) represents a key molecule deriving from biomass characterized by remarkable potential as platform chemical. In this work, for the first time, the hydrogenation of HMF in ethanol was selectively addressed towards 2,5-bis(hydroxymethyl)furan (BHMF) or 2,5-bis(hydroxymethyl)tetrahydrofuran (BHMTHF) by properly tuning the reaction conditions in the presence of the same commercial catalyst (Ru/C), reaching the highest yields of 80 and 93 mol%, respectively. These diols represent not only interesting monomers but strategic precursors for two scarcely investigated ethoxylated biofuels, 2,5-bis(ethoxymethyl)furan (BEMF) and 2,5-bis(ethoxymethyl)tetrahydrofuran (BEMTHF). Therefore, the etherification with ethanol of pure BHMF and BHMTHF and of crude BHMF, as obtained from hydrogenation step, substrates scarcely investigated in the literature, was performed with several commercial heterogeneous acid catalysts. Among them, the zeolite HZSM-5 (Si/Al=25) was the most promising system, achieving the highest BEMF yield of 74 mol%. In particular, for the first time, the synthesis of the fully hydrogenated diether BEMTHF was thoroughly studied, and a novel cascade process for the tailored conversion of HMF to the diethyl ethers BEMF and BEMTHF was proposed., (© 2022 The Authors. ChemSusChem published by Wiley-VCH GmbH.)
- Published
- 2022
- Full Text
- View/download PDF
15. Optimisation of glucose and levulinic acid production from the cellulose fraction of giant reed (Arundo donax L.) performed in the presence of ferric chloride under microwave heating.
- Author
-
Di Fidio N, Fulignati S, De Bari I, Antonetti C, and Raspolli Galletti AM
- Subjects
- Chlorides, Ferric Compounds, Glucose, Heating, Hydrolysis, Levulinic Acids, Poaceae, Cellulose, Microwaves
- Abstract
A two-step exploitation of the giant reed cellulose to glucose and levulinic acid, after the complete removal of the hemicellulose fraction, was investigated using FeCl
3 as catalyst. In the first step, the microwave-assisted hydrolysis of cellulose to glucose was optimised by response surface methodology analysis, considering the effect of temperature, reaction time and catalyst amount. Under the optimised reaction conditions, the glucose yield was 39.9 mol%. The cellulose-rich residue was also converted by enzymatic hydrolysis, achieving the glucose yield of 39.8 mol%. The exhausted residue deriving from the chemical hydrolysis was further converted to levulinic acid by microwave treatment at harsher reaction conditions. The maximum levulinic acid yield was 64.3 mol%. On the whole, this cascade approach ensured an extensive and sustainable exploitation of the C6 carbohydrates to glucose and levulinic acid, corresponding to about 70 mol% of glucan converted to these valuable bioproducts in the two steps., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier Ltd. All rights reserved.)- Published
- 2020
- Full Text
- View/download PDF
16. In-depth characterization of valuable char obtained from hydrothermal conversion of hazelnut shells to levulinic acid.
- Author
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Licursi D, Antonetti C, Fulignati S, Vitolo S, Puccini M, Ribechini E, Bernazzani L, and Raspolli Galletti AM
- Subjects
- Coal, Hot Temperature, Spectroscopy, Fourier Transform Infrared, Corylus, Levulinic Acids
- Abstract
For the first time, the exploitation of hazelnut shells for the combined production of levulinic acid (LA) and hydrochar was investigated. The optimization of the catalytic hydrothermal treatment was performed both in autoclave and microwave reactor, approaching a maximum LA yield of ∼9-12wt%. Hydrochars recovered with high yield (∼43-47wt%) were characterized by different techniques, including elemental and proximate analysis, heating value, FT-IR, XPS, XRD, SEM-EDX, and SAA. Their "lignite-like" energetic properties make them suitable for the energy recovery within the same biorefinery plant for LA production, thus partially offsetting the cost of the entire process. Alternatively, since the synthesized hydrochars maintain high levels of oxygenated groups, they could be smartly exploited as natural sorbents for environmental applications. The proposed integrated approach makes possible to fully exploit this waste, smartly closing its biorefinery cycle in a sustainable development perspective., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF
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