CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Ping Zhu,Zhongji Gu,Shu Hong,Hailan Lian
For the first time in this study, chitin was solely extracted from lobster shells through a fast, easy and eco-friendly method using deep eutectic solvents (DESs), consisting of mixtures of choline chloride–thiourea (CCT), choline chloride–urea (CCU), choline chloride–glycerol (CCG) and choline chloride–malonic acid (CCMA). The physiochemical properties of the isolated chitins were compared with those of the chemically prepared one and commercial one from shrimp shells. Results showed that CCT, CCU and CCG DESs had no important effect on the elimination of proteins and minerals, while chitin obtained by CCMA DES showed a high purity. The yield (20.63 ± 3.30%) of chitin isolated by CCMA DES was higher than that (16.53 ± 2.35%) of the chemically prepared chitin. The chitin obtained by CCMA DES could be divided into two parts with different crystallinity (67.2% and 80.6%), which also had different thermal stability. Chitin from lobster shells showed porous structure, which is expected to be used for adsorption materials and tissue engineering.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Jiechen Ma,Wei Huang,Xuesheng Zhang,Yucheng Li,Ning Wang
The target of this research was to explore the adsorption characteristics and mechanisms for the adsorption of copper and cadmium by lobster shell biochar. Two biochars were produced from lobster shells through pyrolysis at 300 and 600℃ (labeled LS300 and LS600). The kinetics and isotherm adsorption curves of Cu 2+ and Cd 2+ on these lobster shell biochars were determined. The adsorption kinetic curves were best depicted by the two-compartment model, and the Toth model was suitable for the isotherm data of Cu 2+ and Cd 2+ . Compared with those of LS300, the adsorption capacities of LS600 for Cu 2+ and Cd 2+ were greater. The original biochar and Cu 2+ or Cd 2+ -loaded biochar were analyzed by SEM-EDS, FTIR, and XRD to explore the adsorption mechanisms. Ion exchange with cations, precipitation with minerals, and interaction with functional groups were the potential mechanisms for the adsorption of Cu 2+ and Cd 2+ by the lobster shell biochars. The contribution rates of these three mechanisms were also calculated. The adsorption mechanism of Cu 2+ onto the prepared biochar was dominated by ion exchange, while cation exchange and interaction with functional groups were the primary adsorption mechanisms of LS300 and LS600 for Cd 2+ , respectively. Moreover, the adsorption capacity of lobster shell biochar was higher than that of other reported biochars. The results of this study indicate that lobster shell biochar is a highly effective adsorbent for the removal of Cu 2+ and Cd 2+ from contaminated water.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
FOOD AND AGRICULTURAL IMMUNOLOGY
·
2023
·
IF 3
Jiannan Chen,Xiuhua Xia,Peizhen Li,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
As a type of environmentally deleterious compound, 4-nitrophenol (4-NP) has become a global concern due to its extreme toxicity to aquatic organisms and humans. Herein, we used naturally available crayfish shells as precursors to prepare a new type of carbon dots (CDs) by the hydrothermal method. The as-synthesized CDs exhibited strong blue fluorescence emission which can be sensitively quenched by 4-NP through the static quenching effect because of the formation of a ground state complex between CDs and 4-NP. Accordingly, a facile and rapid fluorescence sensor was developed to detect 4-NP from 0 μM to 50 μM with a limit of detection (LOD) of 0.16 μM. Furthermore, the proposed sensor was successfully applied for the detection of 4-NP in fresh crayfish meat and aquatic water samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
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
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Fangtian Liu,Yang Wu,Min Long,Yifan Ma,Min Zheng,Shiyi Cao,Shixiong Chen,Yumin Du,Chaoji Chen,Hongbing Deng
The property of being stubborn and degradation resistant makes nanoplastic (NP) pollution a long-standing remaining challenge. Here, we apply a designed top-down strategy to leverage the natural hierarchical structure of waste crayfish shells with exposed functional groups for efficient NP capture. The crayfish shell-based organic skeleton with improved flexibility, strength (14.37 to 60.13 MPa), and toughness (24.61 to 278.98 MJ m–3) was prepared by purposefully removing the inorganic components of crayfish shells through a simple two-step acid–alkali treatment. Due to the activated functional groups (e.g., -NH2, −CONH−, and −OH) and ordered architectures with macropores and nanofibers, this porous crayfish shell exhibited effective removal capability of NPs (72.92 mg g–1) by physical interception and hydrogen bond/electrostatic interactions. Moreover, the sustainability and stability of this porous crayfish shell were demonstrated by the maintained high-capture performance after five cycles. Finally, we provided a postprocessing approach that could convert both porous crayfish shell and NPs into a tough flat sheet. Thus, our feasible top-down engineering strategy combined with promising posttreatment is a powerful contender for a recycling approach with broad application scenarios and clear economic advantages for simultaneously addressing both waste biomass and NP pollutants.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 2.467
Cong Gao,Alei Zhang,Kequan Chen,Zhikui Hao,Junmao Tong,Pingkai Ouyang
In this study, a novel chitinase-producing bacterium Chitinibacter sp. GC72 was isolated and investigated for N -acetyl-D-glucosamine production from crayfish shell enzymatic degradation. A dimeric chitinase was purified, which had an optimal activity at a pH of 6.8 and 40 °C. The metal ions Al 3+ , Cu 2+ , and Zn 2+ inhibited the chitinase activity, whereas Ca 2+ , Mn 2+ , and Mg 2+ promoted the activity. The chitinase was active on p -NP-GlcNAc with apparent K m value of 152.83 μmol/L and V m value of 49.12 μmol/L min at 37 °C. Based on the hydrolysate formed, the chitinase was characterized as an exo-hydrolytic N -acetyl glucosaminidase. Furthermore, combined treatment of ultra-micro grinding and ultrasonic with direct enzymatic hydrolysis of crayfish shell for GlcNAc production was investigated, which resulted in 15.2 g of GlcNAc production from 100 g of crayfish shell following chitinase degradation for 36 h.
研究领域:
微生物学
·
酶学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
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
·
废物管理
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 133
·期 1
·191-208
·
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
·
催化
·
绿色化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
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
·
生物技术
·
微生物学
·
废物管理
·
生物化学工程
✓ 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）