期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 56, 期 1, 页码 634-641出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c06471
关键词
selective oxidation; phosphonate; Fenton-like reaction; intramolecular electron transfer; metal-ligand complexation
资金
- Natural Science Foundation of China [21925602/51878332]
- Fundamental Research Funds for the Central Universities [14380177]
Phosphonates are highly soluble organophosphorus compounds in contaminated waters, and their selective oxidation into phosphates is urgently needed. This study demonstrated efficient and selective oxidation of 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) by the Cu(II)/H2O2 process at alkaline pH, unaffected by natural organic matters or various anions. The complexation of Cu(II) with HEDP enabled an intramolecular electron transfer process, resulting in high selective oxidation, which was further validated in an industrial effluent.
Phosphonate is an important category of highly soluble organophosphorus in contaminated waters, and its oxidative transformation into phosphate is usually a prerequisite step to achieve the in-depth removal of the total phosphorus. Currently, selective oxidation of phosphonate into phosphate is urgently desired as conventional advanced oxidation processes suffer from severe matrix interferences. Herein, we employed 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) as a model phosphonate and demonstrated its efficient and selective oxidation by the Cu(II)/H2O2 process at alkaline pH. In the presence of trace Cu(II) (0.020 mM), 90.8% of HEDP (0.10 mM) was converted to phosphate by H2O2 in 30 min at pH 9.5, whereas negligible conversion was observed by UV/H2O2 or a Fenton reaction (pH = 3.0). The oxidation of HEDP by Cu(II)/H2O2 was insignificantly affected by natural organic matters (10.0 mg TOC/L) and various anions including chloride, sulfate, and nitrate (10.0 mM). The complexation of Cu(II) with HEDP coupling Cu(III) produced in situ enabled an intramolecular electron transfer process, which features high selective oxidation. Selective degradation of HEDP was further validated by adding stoichiometric H2O2 into an industrial effluent, where the existing Cu(II) could serve as the catalyst. This study also provides a successful case to trigger selective oxidation of trace pollutants of concern upon synergizing with the nature of the contaminated water.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据