FeS介导下的1,2-二溴乙烷非生物自然衰减

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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 k_obs 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.

Key words： halogenated hydrocarbon groundwater remediation groundwater pollution gas station natural attenuation leaded gasoline abiotic degradation iron mineral

Received: 22 May 2023

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X523

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	GU Chun-yun
	LIAO Gao-ming
	DENG Yi-rong
	MA Jie

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GU Chun-yun,LIAO Gao-ming,DENG Yi-rong等. The abiotic natural attenuation of 1,2-dibromoethane mediated by FeS[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4632-4638.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4632

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