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Effects of Low-Molecular-Weight Organics on the Photoreduction of Bromate in Water
ACS ES&T Engineering Pub Date : 2021-02-07 , DOI: 10.1021/acsestengg.0c00244
Zhihao Chen 1, 2 , Jiyuan Jin 1 , Xiaojie Song 1 , Shijie Wei 1 , Li Zhang 1 , Shujuan Zhang 1
Affiliation  

Reduction of bromate to bromide is of great significance for the remediation of bromate-containing waters. In natural water, some low-molecular-weight organics (LMWOs) ubiquitously coexist with bromate. However, LMWOs-mediated photoreduction of bromate has been rarely studied. Herein, we found that acids (formic acid, acetic acid, pyruvic acid, lactic acid, and oxalic acid), aldehydes (formaldehyde and acetaldehyde), alcohols (tert-butyl and isopropyl), ketones (acetone, 2,3-butanedione, acetylacetone (AA), and 2,5-hexanedione), and quinones (hydroquinone and benzoquinone) could all enhance the photoreduction of bromate under UV irradiation. The mechanisms of LMWOs-mediated photoreduction of bromate were systematically elucidated. Special attention was paid to AA, because the photolysis of AA generates most of the other tested aliphatic LMWOs. The presence of LMWOs exerted complicated effects on the formation of disinfection byproducts (DBPs): On the one hand, the presence of AA inhibited the formation of hypobromous acid (HBrO), which is believed to be helpful to control the potential formation of DBPs, because HBrO is a key precursor of halogenated DBPs. On the other hand, the LMWOs possibly functioned as precursors of organic halogens. The results here may help us to better understand the fate of bromine species in the natural aquatic environment.

中文翻译:

低分子量有机物对水中溴酸盐光还原的影响

将溴酸盐还原为溴化物对修复含溴酸盐的水具有重要意义。在天然水中,某些低分子量有机物(LMWOs)与溴酸盐共存。但是,很少研究LMWOs介导的溴酸盐的光还原。在这里,我们发现酸(甲酸,乙酸,丙酮酸,乳酸和草酸),醛类(甲醛和乙醛),醇类(-丁基和异丙基),酮(丙酮,2,3-丁二酮,乙酰丙酮(AA)和2,5-己二酮)和醌(对苯二酚和苯醌)在紫外线辐射下均可增强溴酸盐的光还原作用。系统地阐明了LMWOs介导的溴酸盐光还原的机理。尤其要注意AA,因为AA的光解会产生大多数其他经过测试的脂族LMWO。LMWO的存在对消毒副产物(DBP)的形成产生了复杂的影响:一方面,AA的存在抑制了次溴酸(HBrO)的形成,据信这有助于控制DBP的潜在形成,因为HBrO是卤代DBP的关键前体。另一方面,LMWO可能充当有机卤素的前体。
更新日期:2021-03-12
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