Effects and mechanism on cadmium adsorption removal by CaCl2-modified biochar from selenium-rich straw

被引：37
作者：
Gao, Zongyu [1 ,2 ]
Shan, Dexin [2 ]
He, Jiahong [2 ]
Huang, Tao [2 ]
Mao, Yuan [2 ]
Tan, Haiping [2 ]
Shi, Huiting [1 ,2 ]
Li, Tingzhen [1 ]
Xie, Taiping [3 ,4 ]
机构：
[1] Chongqing Three Gorges Univ, Key Lab Water Environm Evolut & Pollut Control Thr, Wan Zhou 404100, Peoples R China
[2] Chongqing Univ Arts & Sci, Coll Chem & Environm Engn, Chongqing Key Lab Environm Mat & Remediat Technol, Yongchuan 402160, Peoples R China
[3] Yangtze Normal Univ, Sch Mat Sci & Engn, Chongqing 408100, Peoples R China
[4] Chongqing Univ, Sch Chem & Chem Engn, Chongqing 400044, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2023年 / 370卷
关键词：
Selenium -rich straw; Biochar; Cadmium ions; Calcium chloride; Heavy metals; AQUEOUS-SOLUTION; RELATIVE DISTRIBUTION; CD(II); WATER; EFFICIENCY; SORPTION; LEAD; CD;
D O I：
10.1016/j.biortech.2022.128563
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
As every-one knows, cadmium contamination poses a significant and permanent threat to people and aquatic life. Therefore, research on how to remove cadmium from wastewater is essential to protect the natural environment. In this study, agricultural and forestry waste straw sprayed with selenium-enriched foliar fertilizer was prepared as biochar, which was altered by calcium chloride (CaCl2) to remove Cd2+ from water. The outcomes demon-strated that biochar generated by pyrolysis at 700 degrees C (BC700) had the best adsorption effect. Secondly, pseudo -second-order kinetics and Langmuir adsorption models were used to predict the Cd2+ adsorption. Finally, electrostatic adsorption, ion exchange, and complexation of oxygen functional groups (OFGs) were demon-strated to be the main adsorption mechanisms. These conclusions indicate that selenium-rich straw biochar is a novel adsorbent for agroforestry waste recovery. Meanwhile, this work will offer a promising strategy for the overall utilization of rice straw.
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页数：8
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