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Boron (B) and nitrogen (N) co-doped 3D hierarchical porous carbon (BNPC) were successfully fabricated from CNF/BNNS/ZIF-8 nanocomposites prepared by 2D boron nitride nanosheets, ZIF-8 nanoparticles, and wheat straw based cellulose nanofibers. Herein, CNF/ZIF-8 acts as versatile skeleton and imparts partial N dopant into porous carbon structure, while the introduced BNNS can help strengthen the hierarchical porous superstructure and endow abundant B/N co-dopants within BNPC matrix. The obtained BNPC electrode possesses a high specific surface area of 505.4 m2/g and high B/N co-doping content with desirable hydrophilicity. Supercapacitors assembled with BNPC-2 electrode exhibited advanced electrochemical performance with high capacitance stability even after 5000 charge-discharge cycles, exhibited outstanding energy density and power density characters, and the highest specific capacitance of 433.4 F/g at 1.0 A/g, compared with other similar reports. This study proposes a facile and sustainable strategy for efficiently fabrication of rich B/N co-doped hierarchical porous carbon electrodes from agricultural waste biomass for advanced supercapacitor performance.

Lignin nanoparticles (LNPs), as one of green and sustainable biological macromolecules, have attracted great attention owing to their promising potentials in many valorized fields. However, the lignin heterogeneity seriously restricts the controllable preparation of LNPs. Herein, a facile nanogrinding activation combining anhydrous ethanol dissolution process was developed to efficiently homogenize lignin prior to gradient ethanol fractionation. Two lignin fractions were obtained from nanogrinding activation/ethanol dissolution followed by gradient ethanol fractionation: L-fractions and S-fractions. Therefore, monodispersed LNPs with unique concave hollow nanostructure and large particle size, and monodispersed LNPs with solid core nanostructure and small particle size were successfully prepared from L-fractions and S-fractions, respectively, via a GVL/water anti-solvent method. The proposed LNPs formation mechanisms facilitated by nanogrinding activation/ethanol dissolution treatment were demonstrated. This study put forwards a facile and green integrated approach for monodispersed LNPs preparation with controllable morphology and particle size.

Nowadays, wood pulp addition (such as softwood, hardwood, etc.) into manufacture reconstructed tobacco sheet (RTS) via a paper-making process is a feasible and sustainable technology. However, the addition of wood pulp in RTS would weaken the tobacco fragrance of cigarette by bring wood gas when smoking. In this study, a practical and feasible pretreatment by hot water/cooking process combined with cationic modification/homogenization treatment was proposed to directly isolate desirable cellulose nanofibers from tobacco stem, named TCNF. The obtained TCNF was applied in the preparation of RTS to improve its physical properties but with a reduced wood pulp proportion (from 25 wt% decreased to 16 wt%). Results showed that TCNF exhibit a similar morphology with wood based nanocellulose, and that the addition of TCNF (0.5 wt% based dried tobacco pulp) can substitute 9 % of wood pulp compared with that of the control at the similar physical properties.

Composite solid-state electrolytes (CSEs) with high ionic conductivity and low interfacial resistance have been pursued for next‐generation high energy density all solid-state lithium-ion batteries (ASSLIBs). Herein, we report a novel strategy of developing thin, flexible, and conductive CSEs by using lignin nanoparticles (LNPs) to regulate pore characteristics of cellulose nanofibril (CNF) film template. The CNF-LNP film was first prepared, then LNPs were removed, thanks to the excellent LNP solubility in γ-Valerolactone (GVL), resulting in the formation of uniform and porous cellulose nanofibril (CNF) film, which is then utilized for preparing Li7La3Zr2O12 (LLZO) membrane, with a superior morphological architecture (pore size, uniformity). Poly (ethylene oxide) (PEO) is then infiltrated into the membrane, producing thin, flexible, and conductive CSEs. Due to the controllable interconnected architecture of LLZO membrane from the LNP regulated CNF film template and its good compatibility with PEO, the as-prepared CSEs exhibit a high lithium ionic conductivity of 1.83 × 10−4 S cm−1 at ambient temperature. The continuous and uniform lithium transfer pathways, with excellent electrolyte/electrode interface contact contribute to long-term cycling stability of symmetric lithium batteries. Hence, the assembled ASSLIBs from the as-prepared CSEs show high discharge specific capacities of 157 and 159.5 mAh g−1 with LiFePO4 and LiNi0.5Mn0.3Co0.2O2 respectively, with attractive cycling stabilities and capacity retention at ambient temperature.

In this study, sodium lignosulfonate (NaLS) was selected as a versatile regulator that possesses a three-function of reducer, dispersant and stabilizer for the preparation of silver nanoparticles (Ag NPs), to finally fabricate sodium lignosulfonate/ silver nanoparticles (NaLS@AgNPs) nanocatalysts. It was found that Ag NPs have the smallest particle size (15 ± 5 nm) and uniform distribution at the optimal NaLS concentration of 1.8 mM. Also, the NaLS@AgNPs nanocomposites exhibited excellent catalytic performance for the catalytic degradation of methylene blue (MB) (almost 100 % removal rate in only 150 s of reaction time, k = 20.4 × 10−3 s-1). A highest methyl orange (MO) removal rate in a H2O2 system as high as 90 % within 200 min with an apparent rate constant k = 4.04 × 10−3 min-1 can be achieved. This work provides a practical and facile one-step approach for preparing “ideal” noble metal nanocatalysts with the assistance of versatile and abundant sodium lignosulfonate derived from pulping process for purifying organic contaminant-containing wastewater with high catalytic degradation efficiency.