Loading of MgO onto Fe-rich sludge-derived Fe0 biochar composites for efficient aqueous Pb2+removal: Performance and mechanism
文献类型： 外文期刊
作者： Zhang, Qi 1 ; Xiao, Wendan 1 ; Chen, De 1 ; Zhao, Shouping 1 ; Zhao, Zhen 1 ; Ye, Xuezhu 1 ; Huang, Xiaolei 1 ; Li, Hui 4 ;
作者机构： 1.State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310021, Peoples R China
2.Minist Agr & Rural Affairs China, Key Lab Informat Traceabil Agr Prod, Hangzhou 310021, Peoples R China
3.Zhejiang Acad Agr Sci, Inst Agroprod Safety & Nutr, Hangzhou 310021, Peoples R China
4.Hunan Acad Forestry, State Key Lab Utilizat Woody Oil Resource, Changsha 410004, Peoples R China
关键词： Zero-valent iron; Magnesium oxide; Biochar; Removal; Pb2+
期刊名称：JOURNAL OF WATER PROCESS ENGINEERING （ 影响因子：6.7； 五年影响因子：6.7 ）
ISSN： 2214-7144
年卷期： 2025 年 69 卷
页码：
收录情况： SCI
摘要： Scavenging of Pb from aquatic environments is of great importance to environmental and human health. Although Fe0 biochar composites (Fe0@BCs) possess high Pb2+ adsorption capacities, they have high fabrication costs and relatively low stability. Here, a novel MgO-modified Fe0@BCs was successfully fabricated by copyrolyzing Fe-rich sludge (FRS) and MgCl2 at 900 degrees C. The Fe0@BC obtained at an FRS:MgCl2 mass ratio of 10.0:2.7 (MBC-2.7) displayed significantly higher performance than unmodified Fe0@BC. MgO loading effectively prevented the formation of Pb0-Fe0 bimetallic systems, thereby reducing the Fe ions and maintaining the pH of the solution. The enhanced ion-exchange capacity due to modification was also correlated with the Pb2+ removal capacity. Moreover, MBC-2.7 primarily removed Pb2+ through chemisorption, with a maximum scavenging capacity of 439.23 mg/g. The removal mechanisms mainly involved adsorption, reduction of Pb2+ to Pb0, ion exchange, and precipitation. Overall, Fe0@BCs after proper modification with MgO presented great promise for use in the remediation of Pb contamination.
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