Crayfish Shell Waste as Safe Biosorbent for Removal of Cu^(2+)and Pb^(2+)from Synthetic Wastewater  

小龙虾壳废料作为的安全生物吸附剂去除合成废水中Cu^(2+)和Pb^(2+)

作　　者：Wan-qun Hu Shuo Chen Hong Jiang 胡万群;陈烁;江鸿(中国科学技术大学应用化学系,中国科学院城市污染物转化重点实验室,合肥230026)

机构地区：[1]CAS Key Laboratory of Urban Pollutants Conversion,Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2022年第5期842-852,I0030-I0033,I0013,共16页化学物理学报（英文）

基　　金：supported by the Key Special Program on the S&T for the Pollution Control and Treatment of Water Bodies(No.2017ZX07603-003)。

摘　　要：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).

关 键 词：Crayfish shell BIOSORPTION Safety Precipitation COMPLEXATION Heavy metal ions 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]