Journal of the Taiwan Institute of Chemical Engineers
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2021
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IF 5.876
Shihan Wang,Siyao Bian,Jianzhuo Liu,Jihui Li,Shuying Xu,Zhenyi Liang
Background Biochar has attracted considerable attention as a low-cost adsorbent comprised of carbon matrix and mineral for treatment of wastewater. The main purpose of this work was to manufacture CaCO 3 -rich biochars using crayfish shell as feedstock for removal of Cu(II) and Pb(II) from aqueous solution. Methods Pristine and magnetic biochars were prepared via direct pyrolysis and K 2 FeO 4 -promoted pyrolysis , respectively, and characterized by element analysis, BET, FTIR, SEM-EDS, XRD and XPS. Moreover, their adsorption capabilities toward Cu(II) and Pb(II) were investigated in aqueous solution. Findings A large amount of CaCO 3 was assembled on the pristine biochar pyrolyzed at 600 °C, leading to 715.10 mg/g and 1682.87 mg/g adsorption capacities for Cu(II) and Pb(II), respectively. Whereas, CaCO 3 and single phase Fe 3 O 4 were simultaneously introduced into the magnetic biochar with K 2 FeO 4 -promoted pyrolysis at 600 °C using 1/1 (g/g) ratio of K 2 FeO 4 to crayfish shell, where 417.05 mg/g and 974.10 mg/g maximum adsorption capabilities were obtained for Cu(II) and Pb(II) with 29.66 emu/g saturation magnetism, respectively. Cu(II) and Pb(II) were mainly adsorbed onto the biochars as carbonates and oxides by their interaction with CaCO 3 and carbon matrix.
研究领域:
环境科学
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材料科学
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废水处理
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Long Zhang,Jiake Wang,Boxiang Zhan,Yongqi Deng,Lifeng Yan
Chitin is a natural biomass material with wide sources and high application potential, but the solvents for dissolving chitin are very limited. In this work, ternary alkaline deep eutectic solvents (DESs) containing amino acids, urea, and 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU) were prepared, which can successfully achieve the dissolution of chitin and can be recycled. By adjusting the type of amino acids and the amount of DBU, the maximum solubility of chitin can reach 6.0 wt %. In addition, unlike the reported acidic DES system, this new ternary alkaline DES not only efficiently extracted chitin from crayfish shell waste but also efficiently prepared calcium lactate (CL), which successfully realized the effective recycling of calcium resources. Through 11 sets of extraction conditions, proteins in the crayfish shell were effectively removed, and the yields of chitin and CL remained above 85 and 90%, respectively. Finally, chitin nanofibers were successfully prepared by ultrasonic treatment with extracted regenerated chitin. Further processing of the chitin nanofibers can yield chitin films with high transparency and high tensile strength (63.2 MPa). It provides a novel DES system to dissolve chitin and an environmentally friendly utilization strategy to efficiently extract chitin and prepare CL from crayfish shell waste, thereby producing high-performance functional materials.
研究领域:
材料科学
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环境科学
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化学工程
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废物管理
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
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2021
·Vol. 133
·期 1
·191-208
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IF 2.081
Wang Jianye,Liu Haifeng,Chen Zhonghui,Sun Yifeng,Wang Song
Waste crayfish shell powder was utilized to prepare a series of solid base catalyst for the transesterification of glycerol with dimethyl carbonate to synthesize glycerol carbonate. Thermal decomposition behavior of waste crayfish shell powder was investigated by thermogravimetric analysis (TGA) and the different catalysts prepared at different calcinations temperature were characterized using FESEM, XRD, FTIR, BET techniques. It was clearly confirmed that the catalyst generated by the calcination of waste crayfish shell at 800 °C exhibited excellent catalytic activity, 98.7% glycerol conversion and 95.3% glycerol carbonate yield were obtained under mild reaction conditions such as 90 min of reaction time, 1:6 molar ratio of glycerol to dimethyl carbonate, 4 wt% of catalyst loading and 75 °C of reaction temperature.
研究领域:
化学工程
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催化
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绿色化学
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材料科学
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DOI
高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Shiyu Fang,Wangbei Cao,Qianqi Shao,Wenxuan Huang,Feng Wang,Xiaoshi Cheng,Jiashun Cao,Jingyang Luo,Yang Wu
Crawfish shell wastes (CSW) are abundant with valuable substrates, which possess great resource potentials. This work has revealed the feasibility of CSW reutilization for effective volatile fatty acids (VFAs) generation with waste active sludge (WAS) via anaerobic fermentation. The maximum VFAs generation reached 17963 mg COD/L when the CSW/WAS mass ratio was 3.25:1, while it was 784 mg COD/L in the control reactor. Meanwhile, each gram of CSW could be transformed into 264 mg COD equivalent VFAs. The feed of CSW brought in massive organic substrates, which significantly promoted the solubilization , hydrolysis and acidification processes in the CSW/WAS co-fermentation systems simultaneously. The metabolism of carbohydrates took priority over proteins in contributing to the VFAs promotion. More importantly, the functional anaerobes ( i.e. , Paludicola sp. and Macellibacteroides sp.), which participated in the main substrates decomposition with the VFAs as the primary metabolites , were evidently enriched in the presence of CSW. The critical hydrolases and acid-forming enzymes relevant to VFAs biosynthesis were all enhanced. Moreover, the key genes encoding for the main substrates metabolisms ( i.e., chitin) and VFAs production were remarkably up-regulated. The evident promotion of microbial activities and metabolic functions was mainly ascribed to the favorable fermentation conditions ( i.e., pH, ORP and C/N) induced by CSW conditioning. This study proposed an innovative strategy to recover high-value products from CSW, and in-depth insights of microbial traits and genetic functions in CSW/WAS co-fermentation systems.
研究领域:
环境工程
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生物技术
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微生物学
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废物管理
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生物化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）