Nano Energy
·
2025
·
IF 17.1
Zuheng Jin,Manli Lu,Chuan Jiang,Sha Wu,Liupan Tang,Changzheng Hu,Laijun Liu,Liang Fang,Zhenxiang Cheng
Traditional methods of hydrogen peroxide (H 2 O 2 ) production, such as the anthraquinone process and electrolysis, face challenges including high costs, significant energy consumption, and strict electrode requirements. Therefore, this study proposes a mechanocatalytic approach for H 2 O 2 production. By utilizing the molten-salt method, KSr 2 Nb 3 Ta 2 O 15 ferroelectric nanorods were synthesized to achieve a mechanocatalytic H 2 O 2 yield of 117 μmol/L/h in a glass beaker equipped with a PTFE disk. Remarkably, substituting the glass beaker with a ZrO 2 ball mill for the mechanocatalytic experiments significantly increased the H 2 O 2 yield to 820 μmol/L/h. The Piezoelectric Force Microscopy (PFM), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis revealed that the inherent electric field of ferroelectric materials and the abundant specific surface area on the KSr 2 Nb 3 Ta 2 O 15 nanorod surface enhance electron transfer during the mechanocatalytic process. Rotating Ring-Disk Electrode tests indicated that the mechanocatalytic one-step two-electron pathway dominates H 2 O 2 generation through mechanocatalysis with an 85 % selectivity rate, surpassing conventional two-step one-electron pathway efficiency in oxygen reduction reaction. Output charge testing of vertical contact separation mode triboelectric nanogenerator (CS-TENG) determines the ability of a material to gain or lose electrons during friction processes. This breakthrough presents a novel and efficient method for H 2 O 2 production via mechanocatalysis. Using the molten-salt method, KSr 2 Nb 3 Ta 2 O 15 ferroelectric nanorods were synthesized, resulting in a mechanocatalytic H 2 O 2 yield of 820 μmol/L/h in a ball mill jar. Comprehensive analysis utilizing PFM, SEM, BET, RRDE, CS-TENG and by comparing the effect of mechanocatalysis with different materials demonstrated that the built-in electric field of ferroelectric materials enhance electron transfer in the mechanocatalytic process. This breakthrough presents a novel and efficient method for H 2 O 2 production through mechanocatalysis.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2022
·
IF 8.816
Jingxue Li,Yingxiong Wang,Wanbin Zhu,Shanshuai Chen,Tiansheng Deng,Shuaishuai Ma,Hongliang Wang
Pretreatment is the initial stage of lignocellulosic biorefinery process, but is limited by the time-consuming processes, harsh conditions and/or undesirable products. Herein, a mild (<60 °C) and highly efficient pretreatment strategy is developed. The novel mechanocatalytical reaction system driven by fluid shear force helps to exfoliate cellulose from lignocellulose, and the heat generated by the shear process can be used to precipitate and recover the dissolved cellulose from the precooled NaOH/urea solution. The regenerated cellulose shows satisfying crystal structure (cellulose II), significantly decreased crystallinity and nearly tripled enzymolysis glucose yield. Almost 90% of lignin and hemicellulose could be rapidly separated. The separated lignin shows a nearly native structure with 64% β-O-4 linkage, which is even higher than the ball-milling lignin (60%). This research provides a theoretical guidance for the mild pretreatment of lignocellulosic biomass, which will push the application of mechanocatalytical reaction system in biorefinery processes on a large scale.
研究领域:
生物工程
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Jiaquan Li,Chunjing Su,Ying Shu,Jun Huang
The efficient upcycling of biowaste into high-value chemicals is a key step toward sustainable biomass utilization. In this study, we report the tandem valorization of chitin and glycerol biowaste using solid acid catalysts without the use of homogeneous additives. The process integrates mechanocatalytic hydrolysis of chitin with subsequent hydrothermal treatment to produce 5-hydroxymethylfurfural (5-HMF), while simultaneously utilizing acetic acid, generated from chitin hydrolysis, to convert glycerol into valuable glycerol acetates. We systematically investigated the effects of solvent systems and catalyst properties on reaction selectivity and product evolution, revealing that the precise control of solvent composition and reaction time play a crucial role in optimizing product yield. By replacing conventional dimethyl sulfoxide (DMSO) with greener solvents, we achieved comparable yields at lower temperatures and shorter reaction times, improving both efficiency and sustainability. Moreover, mechanistic studies identified surface carboxyl groups on carbon-based catalysts as the primary Brønsted acid sites responsible for chitin depolymerization in mechanocatalytic process and 5-HMF formation in the hydrothermal dehydration reaction. The strong Brønsted acid sites on the solid catalyst efficiently contribute to both 5-HMF formation and glycerol acetylation in this one-pot reaction. These findings offer new insights into biomass valorization and provide a foundation for designing greener and more efficient catalytic processes for biowaste upcycling.
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yanjun Chen,Junqiang Shan,Yulian Cao,Xin Shen,Chenglun Tang,Ming Li,Wei Zhuang,Chenjie Zhu,Hanjie Ying
Mechanocatalytic depolymerization of lignocellulose constitutes a new frontier in biorefinery. In this study, a weak alkali-oxidation pretreatment with sodium percarbonate was employed to isolate hemicellulose from corncob, which was comprehensively characterized by FTIR, 1 H, 13 C, and 2D HSQC NMR. The influences of impregnation solvent, the type and dosage of acid catalyst, and ball-milling time on the mechanocatalytic depolymerization of hemicellulose have been systematically investigated. A mathematical model based on Kamlet-Taft parameters was first proposed to reveal the relationship between the reaction conversion and the solvent properties, and the results suggested a solvent possessing a high polarity/polarizability and Lewis basicity is favorable for the reaction. Under the optimal conditions, 97.1% conversion of hemicellulose with 93.1% selectivity of xylooligosaccharides based on xylans could be achieved within 2 h. Qualitative high-resolution ESI-MS and quantitative HPAEC analysis demonstrated the good solubility of the obtained xylooligosaccharides was ascribed to the depolymerization of hemicellulose rather than the formation of sulfonated oligosaccharides .
研究领域:
生物炼制
·
化学工程
·
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）