Cobalt/Iron Bimetallic Biochar Composites for Lead(II) Adsorption: Mechanism and Remediation Performance
Jingyu Zhao,
Yuhong Qin,
Yue Liu,
Yunlong Shi,
Qiang Lin,
Miao Cai,
Zhenya Jia,
Changjiang Yu,
Anqi Shang,
Yuxiao Fei,
Jiayi Zhang
Affiliations
Jingyu Zhao
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Yuhong Qin
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Yue Liu
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Yunlong Shi
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Qiang Lin
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Miao Cai
Hainan Pujin Environmental Technology Co., Ltd., Haikou 570125, China
Zhenya Jia
Hainan Huantai Environmental Resources Co., Ltd., Haikou 571158, China
Changjiang Yu
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Anqi Shang
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Yuxiao Fei
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
Jiayi Zhang
Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Function Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, No. 99 Longkunnan Road, Haikou 571158, China
The performance of nano-zero-valent iron for heavy metal remediation can be enhanced via incorporation into bimetallic carbon composites. However, few economical and green approaches are available for preparing bimetallic composite materials. In this study, novel Co/Fe bimetallic biochar composites (BC@Co/Fe-X, where X = 5 or 10 represents the CoCl2 concentration of 0.05 or 0.1 mol L−1) were prepared for the adsorption of Pb2+. The effect of the concentration of cross-linked metal ions on Pb2+ adsorption was investigated, with the composite prepared using 0.05 mol L−1 Co2+ (BC@Co/Fe-5) exhibiting the highest adsorption performance. Various factors, including the adsorption period, Pb2+ concentration, and pH, affected the adsorption of Pb2+ by BC@Co/Fe-5. Further characterisation of BC@Co/Fe-5 before and after Pb2+ adsorption using methods such as X-ray diffraction and X-ray photoelectron spectroscopy suggested that the Pb2+ adsorption mechanism involved (i) Pb2+ reduction to Pb0 by Co/Fe, (ii) Co/Fe corrosion to generate Fe2+ and fix Pb2+ in the form of PbO, and (iii) Pb2+ adsorption by Co/Fe biochar. Notably, BC@Co/Fe-5 exhibited excellent remediation performance in simulated Pb2+-contaminated water and soil with good recyclability.