Enhanced remediation of heavy metals contaminated soils with EK-PRB using β-CD/hydrothermal biochar by waste cotton as reactive barrier. (January 2022)

• Record Type: Journal Article
• Authors: Li, Yulin; Shao, Mengyu; Huang, Manhong; Sang, Wenjing; Zheng, Shengyang; Jiang, Nan; Gao, Yanan
• Is Part Of: Chemosphere. Volume 286:Part 1(2022)
• Publication Date: 2022-01
• Subjects: Biochar -- Waste cotton -- Hydrothermal carbonization -- Electrokinetic-permeable reactive barrier -- Adsorption -- Heavy metals; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.131470
• Languages: English
• ISSNs: 0045-6535

Abstract

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 Pb 2+ and Cd 2+ 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 Pb 2+ and Cd 2+ 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. Graphical abstract: Image 1 Highlights: Biochar was prepared from waste cotton by hydrothermal carbonization. β-cyclodextrin/Hydrothermal charcoal enhanced Pb and Cd adsorption capacity to 150%. Removal efficiencies of Pb and Cd were above 86% by EK-PRB with β-cyclodextrin/Hydrothermal charcoal. Over 80% of Pb and Cd removal were contributed by complexation and electromigration.