Adsorption characteristics and the removal mechanism of two novel Fe-Zn composite modified biochar for Cd(II) in water

被引：163
作者：
Yang, Tingting [1 ,2 ]
Xu, Yingming [1 ,2 ]
Huang, Qingqing [1 ,2 ]
Sun, Yuebing [1 ,2 ]
Liang, Xuefeng [1 ,2 ]
Wang, Lin [1 ,2 ]
Qin, Xu [1 ,2 ]
Zhao, Lijie [1 ,2 ]
机构：
[1] Minist Agr, Agroenvironm Protect Inst, Innovat Team Remediat Heavy Met Contaminated Farm, Tianjin 300191, Peoples R China
[2] Minist Agr, Key Lab Original Environm Pollut Control, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2021年 / 333卷
关键词：
Cadmium removal; Adsorption mechanism; Precipitation; Complexation; AQUEOUS-SOLUTION; SORPTION; CADMIUM; MAGNETIZATION; TEMPERATURE; ACTIVATION; BEHAVIOR; AS(III); PB(II); CU(II);
D O I：
10.1016/j.biortech.2021.125078
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
In this study, adsorbents (Fe/Zn-RBC and Fe/Zn-DBC) for the removal of Cd(II) in water were successfully prepared by iron/zinc composite modified biochar derived from the branches of Robinia pseudoacacia biochar (RBC) and durian shells biochar (DBC). The results revealed that the iron and zinc ions were successfully loaded onto the biochar. The adsorption data of Cd(II) on Fe/Zn-BC conformed to the models of pseudo-second-order kinetic, Langmuir isothermal, and Redlich-Paterson. According to the results of batch experiments, the maximum sorption capacities of Fe/Zn-RBC and Fe/Zn-DBC for Cd(II) were approximately five times and three times higher than RBC and DBC, respectively. As the most dominant adsorption mechanisms, Cd(II) and CO32-, FeO, Zn-O, and oxygen-containing functional groups on the Fe/Zn-BC surfaces precipitated CdCO3, Cd(OH)2, and CdO. Therefore, Fe/Zn-BC is an excellent adsorbent that removes Cd(II) from aqueous solutions, and also can be used in waste resource utilization, which has potential applications prospects.
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页数：9
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