Crayfish shell is an abundant natural waste and is also a potential biosorbent for pollutants,especially,heavy metals.In this study,the safety of the use of crayfish shell as a biosorbent was first assessed by release...Crayfish shell is an abundant natural waste and is also a potential biosorbent for pollutants,especially,heavy metals.In this study,the safety of the use of crayfish shell as a biosorbent was first assessed by release experiments involving primary heavy metal ions,such as Cu^(2+),Zn^(2+),and Cr^(3+),in aqueous solution under different environmental conditions.The release concentrations of heavy metals were dependent on pH,ionic strength,and humic acid;and the maximum release concentrations of heavy metals were still lower than the national standard.Specifically,Cu^(2+) and Pb^(2+) removal by crayfish shell in synthetic wastewater was investigated.The removal process involved biosorption,precipitation,and complexation,and the results indicate that crayfish shell is an excellent biosorbent for Cu^(2+) and Pb^(2+) removal.The precipitation step is particularly dependent on Ca species,pH,and temperature.The maximum removal capacities of Pb^(2+) and Cu^(2+) were 676.20 and 119.98 mg/g,respectively.The related precipitates and the generated complex products include Cu_(2)CO_(3)(OH)_(2),Ca_(2)CuO_(3),CuCO_(3),Pb_(2)CO_(3)(OH)_(2),CaPb_(3)O_(4),and PbCO_(3).展开更多
As a new research focus in the field of biological resources,crayfish shells have great potential for development and utilization.In this review,the typical methods and research progress of separating the primary comp...As a new research focus in the field of biological resources,crayfish shells have great potential for development and utilization.In this review,the typical methods and research progress of separating the primary components such as chitosan,protein,and astaxanthin from crayfish shells and converting crayfish shells into functional carbon-based materials are introduced in detail.Then,the application of crayfish shell and typically modified crayfish-shell biochar in adsorption,antibacterial,electrochemical,etc.is reviewed.Finally,the future research outlook is proposed.This review can provide some perspectives on the development of the application of crayfish shells and crayfish-shell derivatives.展开更多
基金supported by the Key Special Program on the S&T for the Pollution Control and Treatment of Water Bodies(No.2017ZX07603-003)。
文摘Crayfish shell is an abundant natural waste and is also a potential biosorbent for pollutants,especially,heavy metals.In this study,the safety of the use of crayfish shell as a biosorbent was first assessed by release experiments involving primary heavy metal ions,such as Cu^(2+),Zn^(2+),and Cr^(3+),in aqueous solution under different environmental conditions.The release concentrations of heavy metals were dependent on pH,ionic strength,and humic acid;and the maximum release concentrations of heavy metals were still lower than the national standard.Specifically,Cu^(2+) and Pb^(2+) removal by crayfish shell in synthetic wastewater was investigated.The removal process involved biosorption,precipitation,and complexation,and the results indicate that crayfish shell is an excellent biosorbent for Cu^(2+) and Pb^(2+) removal.The precipitation step is particularly dependent on Ca species,pH,and temperature.The maximum removal capacities of Pb^(2+) and Cu^(2+) were 676.20 and 119.98 mg/g,respectively.The related precipitates and the generated complex products include Cu_(2)CO_(3)(OH)_(2),Ca_(2)CuO_(3),CuCO_(3),Pb_(2)CO_(3)(OH)_(2),CaPb_(3)O_(4),and PbCO_(3).
基金support from the Key Special Program on the S&T for the Pollution Control,and Treatment of Water Bodies(No.2017ZX07603-003).
文摘As a new research focus in the field of biological resources,crayfish shells have great potential for development and utilization.In this review,the typical methods and research progress of separating the primary components such as chitosan,protein,and astaxanthin from crayfish shells and converting crayfish shells into functional carbon-based materials are introduced in detail.Then,the application of crayfish shell and typically modified crayfish-shell biochar in adsorption,antibacterial,electrochemical,etc.is reviewed.Finally,the future research outlook is proposed.This review can provide some perspectives on the development of the application of crayfish shells and crayfish-shell derivatives.
