High-efficiency removal of lead/cadmium from wastewater by MgO modified biochar derived from crofton weed

被引：138
作者：
Cheng, Song [1 ,3 ]
Zhao, Saidan [1 ]
Guo, Hui [2 ,3 ]
Xing, Baolin [1 ,3 ]
Liu, Yongzhi [1 ]
Zhang, Chuanxiang [1 ,3 ]
Ma, Mingjie [1 ]
机构：
[1] Henan Polytech Univ, Coll Chem & Chem Engn, Henan Key Lab Coal Green Convers, Jiaozuo 454003, Henan, Peoples R China
[2] Henan Polytech Univ, Sch Mat Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
[3] Collaborat Innovat Ctr Coal Work Safety & Clean H, Jiaozuo 454003, Henan, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2022年 / 343卷
基金：
中国国家自然科学基金;
关键词：
Crofton weed; Pb2+/Cd2+; Adsorption; Mechanism; Column experiment; COMPETITIVE ADSORPTION; SORPTION MECHANISMS; AQUEOUS-SOLUTION; HEAVY-METALS; PB(II); CU(II); CD(II);
D O I：
10.1016/j.biortech.2021.126081
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
The adsorption performance and mechanisms of Pb2+ and Cd2+ in wastewater using MgO modified biochar derived from crofton weed (MBCW600) are investigated. The Pb2+ and Cd2+ adsorption capacities of MBCW600 by the Hill model reach 384.08 mg/g and 207.02 mg/g, respectively, which is larger than that of original biochar. Pb2+ could be more easily captured by MBCW600 compared to Cd2+ in the multimetal system. Mg2+ contributes to Pb2+ and Cd2+ adsorption among coexisting cations. The exhausted MBCW600 could be well regenerated by simple method after use. The adsorption mechanism study indicates that Pb2+ and Cd2+ removal are primary contributed to mineral precipitation and ion exchange. The effective treatment volumes of Pb2+ and Cd2+ wastewater achieve 3050 mL and 2150 mL in the fixed-bed column experiment, respectively. Therefore, MBCW600 presents remarkable adsorption capability, excellent recoverability and large throughput, which shows the potential application in future treatment of wastewater containing heavy metal.
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页数：8
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