Removal of 1,2-dichloroethane in groundwater using Fenton oxidation

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Won-Gune Jeong , Jong-Gook Kim , Kitae Baek
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引用次数: 20

Abstract

Among the chlorinated aliphatic hydrocarbons, 1,2-dichloroethane (1,2-DCA) is widely used for the synthesis of vinyl chloride monomers. Despite the high demand for 1,2-DCA, it poses a risk to the environment because it is persistent and carcinogenic. Therefore, in this study, several reagents (dithionite, hydrosulfide, sulfite, persulfate, sulfate radicals, and hydroxyl radicals) were evaluated for the degradation of 1,2-DCA. Among these, the hydroxyl radicals generated by the Fenton reaction were the most suitable oxidant, decomposing 92% of 1,2-DCA. Chloride, one of the final oxidized products, was observed, which supported the oxidation reaction. Moreover, with an increasing concentration of hydroxyl radicals, the degradation of 1,2-DCA increased. Furthermore, sufficient amounts of hydrogen peroxide were more important than Fe(II) in the decomposition of 1,2-DCA. The radical reaction can generate larger molecules via the degradation of 1,2-DCA, which are degraded over time. The applicability of Fenton oxidation was evaluated using real 1,2-DCA-contaminated groundwater. Although the degradation of target contaminant was lowered due to the alkaline pH and the presence of chloride and bicarbonate ions in groundwater, the Fenton reaction was still efficient to oxidize 1,2-DCA. These results indicate that Fenton oxidation is an effective technique for the treatment of 1,2-DCA in contaminated groundwater.

Fenton氧化法去除地下水中的1,2-二氯乙烷
在氯化脂肪烃中,1,2-二氯乙烷(1,2- dca)被广泛用于合成氯乙烯单体。尽管1,2- dca需求量很大,但由于它具有持久性和致癌性,因此对环境构成了风险。因此,在本研究中,几种试剂(二亚硝酸盐、氢硫化物、亚硫酸盐、过硫酸盐、硫酸盐自由基和羟基自由基)对1,2- dca的降解进行了评价。其中,Fenton反应生成的羟基自由基是最合适的氧化剂,可分解92%的1,2- dca。观察到最终氧化产物氯化物的存在,支持了氧化反应。此外,随着羟基自由基浓度的增加,1,2- dca的降解也增加。此外,在1,2- dca的分解中,足够量的过氧化氢比铁(II)更重要。自由基反应可以通过1,2- dca的降解产生更大的分子,这些分子随着时间的推移而降解。用实际的1,2- dca污染地下水评价了Fenton氧化法的适用性。虽然地下水中碱性pH和氯离子、碳酸氢盐离子的存在降低了目标污染物的降解,但Fenton反应仍能有效氧化1,2- dca。结果表明,Fenton氧化法是处理地下水中1,2- dca的有效方法。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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