Enhanced remediation of heavy metals contaminated soils with EK-PRB using β-CD/hydrothermal biochar by waste cotton as reactive barrier

Yulin Li; Mengyu Shao; Manhong Huang; Wenjing Sang; Shengyang Zheng; Nan Jiang; Yanan Gao

doi:10.1016/j.chemosphere.2021.131470

Enhanced remediation of heavy metals contaminated soils with EK-PRB using β-CD/hydrothermal biochar by waste cotton as reactive barrier

Chemosphere. 2022 Jan;286(Pt 1):131470. doi: 10.1016/j.chemosphere.2021.131470. Epub 2021 Jul 7.

Authors

Yulin Li¹, Mengyu Shao¹, Manhong Huang², Wenjing Sang¹, Shengyang Zheng¹, Nan Jiang¹, Yanan Gao¹

Affiliations

¹ College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China.
² College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, China; Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education, Shanghai, 201620, China. Electronic address: huangmanhong@dhu.edu.cn.

PMID: 34311401
DOI: 10.1016/j.chemosphere.2021.131470

Abstract

Heavy metals in the soil are major global environmental problems. Waste cotton was used to synthesize a novel β-CD/hydrothermal biochar (KCB), which is a low-cost and environment-friendly adsorbent for heavy metal soil remediation. KCB were used as reactive materials of electrokinetic-permeable reactive barrier (EK-PRB) to explore the removal characteristics of heavy metals. FTIR and XPS analysis revealed that KCB contained large numbers of surface functional groups. Adsorption of KCB for Pb²⁺ and Cd²⁺ reached 50.44 mg g^-1 and 33.77 mg g^-1, respectively. Metal ions in contaminated soil were removed by reactive barrier through electromigration, electrodialysis and electrophoresis, the removal efficiency of Pb²⁺ and Cd²⁺ in soil reached 92.87% and 86.19%. This finding proves that KCB/EK-PRB can be used as a cheap and green process to effectively remediate soils contaminated with heavy metals.

Keywords: Adsorption; Biochar; Electrokinetic-permeable reactive barrier; Heavy metals; Hydrothermal carbonization; Waste cotton.

MeSH terms

Charcoal
Environmental Restoration and Remediation*
Metals, Heavy* / analysis
Soil
Soil Pollutants* / analysis

Substances

Metals, Heavy
Soil
Soil Pollutants
biochar
Charcoal