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首页> 外文期刊>Separation and Purification Technology >UV light-assisted persulfate activation by Cu-0-Cu2O for the degradation of sulfamerazine
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UV light-assisted persulfate activation by Cu-0-Cu2O for the degradation of sulfamerazine

机译：UV光辅助过硫酸盐通过Cu-0-Cu 2 O活化，用于磺胺嘧啶的降解

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摘要

Sulfate radicals-based advanced oxidation process (SRAOP) has received increasing attention in the wastewater treatment area because sulfate radicals have high redox potential. The key for SRAOP is to develop high efficient catalysts that can effectively and stably activate persulfate (PS) to produce sulfate radicals. Cu2O is a good activator of PS and photo-catalyst. However, its catalytic activity is relatively low because of the poor stability and the recombination of electron and holes. In theory, Cu-0 can reduce Cu2+ to form Cu+, which can decrease the recombination of electron and holes from the Cu2O by the formation of heterojunction. In this study, (CuCu2O)-Cu-0 was synthesized by a simple ball-milling method. The as-prepared Cu-0-Cu2O was characterized and used to activate PS for sulfamerazine (SMZ) degradation by means of UV illumination. In the Cu-0-Cu2O/PS/UV system, the removals of 100% SMZ and 30% TOC within 30 min were achieved, respectively, and the removal efficiency of SMZ decreased by only 12.2% after 5 cycles. The high efficiency and good catalytic stability of Cu-0-Cu2O for the activation of PS were due to that Cu-0 and photo-induced electron of Cu2O promoted the conversion of Cu2+ to Cu+. Quenching experiments demonstrated that the hydroxyl radicals and sulfate radicals contributed to SMZ degradation. However, the concentrations and fractions of radicals was affected by the initial pH of solution. Nine intermediate products were identified, and the degradation pathways were proposed, including the fission of sulfur and nitrogen bond, the oxidation of methyl group and the hydroxylation of benzene ring. The effects of initial pH, PS concentration, Cu-0-Cu2O dosage and SMZ initial concentration on the degradation of SMZ were investigated. This study provided an effective catalyst that could simultaneously activate PS and utilize UV to form photo-induced electron, which could enhance the degradation and mineralization of organic pollutants.
机译：基于硫酸盐的高级氧化过程（SRAOP）在废水处理区域中受到越来越长的注意，因为硫酸盐具有高氧化还原潜力。 SRAOP的关键是开发高效催化剂，可有效稳定地激活过硫酸盐（PS）以产生硫酸盐。 Cu2O是PS和光催化剂的良好活化剂。然而，由于电子和孔的稳定性差和重组，其催化活性相对较低。理论上，Cu-0可以减少Cu 2+以形成Cu +，这可以通过形成异质结来减少电子和孔的重组。在该研究中，通过简单的球磨方法合成-CU-0。通过UV照射，其特征在于并用于激活Sulfamerazine（SMZ）降解的PS。在Cu-0-Cu 2 O / PS / UV系统中，分别在30分钟内进行100％SMZ和30％TOC的去除，并且SMZ的去除效率在5次循环后仅减少12.2％。 Cu-0-Cu 2 O用于活化PS的高效率和良好催化稳定性是由于Cu-0和Cu 2 O的光诱导的电子促进了Cu 2 +至Cu +的转化。淬火实验证明羟基自由基和硫酸盐基团导致SMZ降解。然而，基团的浓度和级分受溶液初始pH的影响。鉴定了九种中间产物，提出了降解途径，包括硫磺和氮键的裂变，甲基氧化和苯环的羟基化。研究了初始pH，PS浓度，Cu-0-Cu2O剂量和SMZ初始浓度对SMZ降解的影响。该研究提供了一种有效的催化剂，其可以同时激活PS并利用UV形成光诱导的电子，这可以增强有机污染物的降解和矿化。

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