The abiotic natural attenuation of 1,2-dibromoethane mediated by FeS
GU Chun-yun1, LIAO Gao-ming2, DENG Yi-rong2, MA Jie1
1. State Key Laboratory of Heavy Oil Processing, Beijing Key Lab of Oil & Gas Pollution Control, College of Chemical Engineering and Environment, China University of Petroleum-Beijing, Beijing 1022494, China; 2. Guangdong Provincial Key Laboratory of Environmental Management and Remediation of Contaminated Sites, Guangdong-Hong Kong-Macao Environmental Quality Collaborative Innovation Laboratory, Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, China
Abstract：The reduction degradation of 1,2-dibromoethane (EDB) by FeS in anaerobic environment was studied. The experimental data showed that FeS could effectively degrade EDB under anaerobic conditions. The degradation reaction conformed to the pseudo-first-order reaction kinetics. The corrected kobs value was (0.065±0.003) d-1 (R2=0.91). The degradation half-life was 11days. FeS were characterized by BET, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscope-energy spectroscopy (SEM-EDS). The results showed that FeS had a large specific surface area, which increased the number of reaction sites and thus enhanced the reduction degradation of EDB by FeS. In addition, FeS transformed to goethite and greigite during the reduction reaction. The degradation rate of EDB increased with increases in concentrations of sulfide (HS-) and FeS. At high pH, the reduction degradation of EDB by FeS was faster. In addition, the presence of transition metal ions Co2+ and Cu2+ could promote the degradation of EDB by FeS, while the presence of Mn2+ could inhibit the degradation of EDB. In general, the presence of FeS in the ground can achieve abiotic natural attenuation of EDB in EDB-contaminated groundwater sites.
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