Reductive dechlorination for remediation of polychlorinated biphenyls

• Published in: Chemosphere (Oxford) Vol. 88; no. 7; pp. 757 - 768
• Main Authors: Wu, Ben-Zen, Chen, Hsiang-Yu, Wang, Shaofen J, Wai, Chien M., Liao, Weisheng, Chiu, KongHwa
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-08-2012; Elsevier
• Subjects: Applied sciences; Biodegradation, Environmental; Catalyst; Chlorine - chemistry; Dechlorination; Environmental Monitoring; Environmental Pollutants - chemistry; Exact sciences and technology; Global environmental pollution; Hydrogen - chemistry; Oxidation-Reduction; Pollution; Polychlorinated biphenyls (PCBs); Polychlorinated Biphenyls - chemistry; Reduction; Reduction; Dechlorination; Polychlorinated biphenyls (PCBs); Catalyst; Catalytic reaction; Dehalogenation; Polychlorobiphenyls; Review; Organic chlorine compounds; Hydrogenation; Organic halogen compounds; Persistent organic pollutant; Chemical reduction; Halogenated hydrocarbon; Decontamination; Chlorocarbon; Aromatic compound; Organic compounds
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2012.03.056

► Reductive methods for PCB remediation published in the last decade are reviewed. ► Catalytic HDC with H2 and Fe-based reductive dechlorination are major methods. ► The nano-technology enhances the PCB remediation efficiency. ► The supercritical fluid technology makes the process more environmentally friendly.
Technologies such as thermal, oxidative, reductive, and microbial methods for the remediation of polychlorinated biphenyls (PCBs) have previously been reviewed. Based on energy consumption, formation of PCDD/F, and remediation efficiency, reductive methods have emerged as being advantageous for remediation of PCBs. However, many new developments in this field have not been systematically reviewed. Therefore, reductive technologies published in the last decade related to remediation of PCBs will be reviewed here. Three categories, including catalytic hydrodechlorination with H2, Fe-based reductive dechlorination, and other reductive dechlorination methods (e.g., hydrogen-transfer dechlorination, base-catalyzed dechlorination, and sodium dispersion) are specifically reviewed. In addition, the advantages of each remediation technology are discussed. In this review, 108 articles are referenced.