Investigation on Pb2+adsorption characteristics by AAEMs-rich biochar in aqueous solution: Performance and mechanism

被引：14
作者：
Jiang, Jiahao [1 ]
Li, Ruiyu [1 ,2 ]
Yang, Kaixuan [1 ,3 ]
Li, Yuhang [1 ,4 ]
Deng, Lei [1 ]
Che, Defu [1 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, State Key Lab Multiphase Flow Power Engn, Xia 710049, Peoples R China
[2] Shunde Inst Inspect, Guangdong Inst Special Equipment Inspect & Res, Foshan 528300, Peoples R China
[3] Shanghai Power Equipment Res Inst Co Ltd, Shanghai 200240, Peoples R China
[4] Xian Thermal Power Res Inst Co Ltd, Xian 710032, Peoples R China
来源：
ENVIRONMENTAL RESEARCH | 2023年 / 236卷
基金：
中国国家自然科学基金;
关键词：
soybean straw biochar; Lead removal; Adsorption; AAEMs; Quantitative analysis; Waste water; RELATIVE DISTRIBUTION; SORPTION MECHANISMS; PB(II) ADSORPTION; ION-EXCHANGE; METAL-IONS; LEAD; PYROLYSIS; STRAW; TEMPERATURE; REMOVAL;
D O I：
10.1016/j.envres.2023.116731
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Biochar derived from soybean straw with AAEMs (alkali and alkaline earth metals) enrichment could efficiently remove heavy metals from contaminated water. In this study, the influences of pyrolysis temperature on the physicochemical property and adsorption performance of soybean straw biochar were investigated. The con-tributions of different adsorption mechanisms were analyzed quantitatively. The results show that the soybean straw biochar exhibits excellent Pb2+ adsorption performance (157.2-227.2 mg g-1), with an order of BC800 > BC400 > BC600 > BC700 > BC500. The mechanisms of metal ion exchange (37.49%-72.58%) and precipitation with minerals (22.38%-58.03%) mainly control the Pb2+ adsorption, whereas complexation with organic functional groups (OFGs) and cation-C & pi; interaction make the less contribution. The order of cation exchange capacity (CEC) is BC400 > BC800 > BC700 > BC600 > BC500, showing a high correlation (0.965) with the contribution of metal ion exchange with AAEMs. Moreover, Ca exhibits the strongest exchange capacity. The contribution of precipitation is consistent with the variation of soluble CO32-content in biochar. These results suggest that soybean straw biochar rich in AAEMs is a prospective adsorbent for Pb2+ elimination.
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页数：9
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