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Crayfish Shell Waste As a Safe Biosorbent for The Removal of Cu2+ and Pb2+ from Synthetic Wastewater
ShuoChen
CAS Key Laboratory of Urban Pollutants Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
Abstract:
Crayfish shell is an abundant natural waste meanwhile a potential biosorbent for pollutants if the release of heavy metals can be ignored. In this study, the safety of crayfish shell as a biosorbent was first accessed by the release experiments involving primary heavy metal ions, such as Cu2+, Zn2+, and Cr3+, in aqueous solution under environmental conditions. Although the release concentrations of heavy metals were dependent on pH, ionic strength, and humic acid, the concentrations were still lower than the national standard. The removal of Cu2+ and Pb2+ by crayfish shell in synthetic wastewater was investigated. The results indicated that crayfish shell is an excellent biosorbent for the removal of Cu2+ and Pb2+, and the removal process involved biosorption, precipitation, and complexation. Particularly, the precipitation step is calcium species-, pH- and temperature-dependent. The maximum removal capacity of Pb2+ and Cu2+ reached 676.20 and 119.98 mg g-1, respectively. The related precipitation and complex products include Cu2CO3(OH)2, Ca2CuO3, CuCO3, Pb2CO3(OH)2, CaPb3O4, and PbCO3. This study evaluated a recyclable pathway of crayfish shell waste and provides a new explanation for the biosorption of heavy metals by crayfish shell.
Key words:  Crayfish shell  biosorption  safety  precipitation  complexation  heavy metal ions
FundProject:
Supplymentary:   S1-_Crayfish_Shell_Waste_As_a_Safe_Biosorbent_for_The_Removal_of_Cu2+_and_Pb2+_from_Synthetic_Wastewater.docx  Response.docx  S1-_Crayfish_Shell_Waste_As_a_Safe_Biosorbent_for_The_Removal_of_Cu2 _and_Pb2 _from_Synthetic_Wastewater.docx
Crayfish Shell Waste As a Safe Biosorbent for The Removal of Cu2+ and Pb2+ from Synthetic Wastewater
ShuoChen
CAS Key Laboratory of Urban Pollutants Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
摘要:
Crayfish shell is an abundant natural waste meanwhile a potential biosorbent for pollutants if the release of heavy metals can be ignored. In this study, the safety of crayfish shell as a biosorbent was first accessed by the release experiments involving primary heavy metal ions, such as Cu2+, Zn2+, and Cr3+, in aqueous solution under environmental conditions. Although the release concentrations of heavy metals were dependent on pH, ionic strength, and humic acid, the concentrations were still lower than the national standard. The removal of Cu2+ and Pb2+ by crayfish shell in synthetic wastewater was investigated. The results indicated that crayfish shell is an excellent biosorbent for the removal of Cu2+ and Pb2+, and the removal process involved biosorption, precipitation, and complexation. Particularly, the precipitation step is calcium species-, pH- and temperature-dependent. The maximum removal capacity of Pb2+ and Cu2+ reached 676.20 and 119.98 mg g-1, respectively. The related precipitation and complex products include Cu2CO3(OH)2, Ca2CuO3, CuCO3, Pb2CO3(OH)2, CaPb3O4, and PbCO3. This study evaluated a recyclable pathway of crayfish shell waste and provides a new explanation for the biosorption of heavy metals by crayfish shell.
关键词:  Crayfish shell  biosorption  safety  precipitation  complexation  heavy metal ions
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