过硫酸盐
化学
苯并三唑
羟基自由基
高级氧化法
硫酸盐
激进的
过氧二硫酸盐
降级(电信)
无机化学
动力学
核化学
催化作用
有机化学
物理
电信
量子力学
计算机科学
作者
Jie Ma,Yi Ding,Liping Chi,Xin Yang,Yingjie Zhong,Zhiheng Wang,Quan Shi
标识
DOI:10.1080/09593330.2019.1625959
摘要
Benzotriazole (BTA) is a recalcitrant contaminant that is widely distributed in aquatic environments. This study explored the effectiveness of sulfate radical-based advanced oxidation process in degrading BTA (SR-AOP). The sulfate radical was generated by heat activation of persulfate (PS). Our results show alkaline pH promoted the BTA degradation. The solution pH also affected the speciation of total radicals. Sulfate radical (SO4⋅−) predominated at acidic pH while hydroxyl radical (HO•) predominated at basic pH. High temperature, high PS concentration and low BTA concentration promoted the BTA degradation. Influence of water matrix constituents on the reaction kinetics was assessed. We found that ≤10 mM of Cl− promoted the reaction, but 100 mM Cl− inhibited it. HCO3− was similar to Cl−. Br− and CO32− inhibited the reaction while SO42− did not affect the reaction. NO3− of ≤10 mM did not affect the reaction, but 100 mM of NO3− inhibited it. Eleven degradation intermediates were identified using ultra-high solution Orbitrap mass spectrometry. Based on the intermediates identified, possible reaction pathways were proposed. Overall, SR-AOP can effectively mineralize BTA, but water matrix constituents greatly influenced the reaction kinetics and thus should be carefully considered for its practical application.Abbreviations: BTA, benzotriazole; PS, persulfate; PMS, peroxymonosulfate; SPC, sodium percarbonate; AOP, advanced oxidation process; PS-AOP, persulfate-based advanced oxidation process; SR-AOP, sulfate radical-based advanced oxidation process; TAP, thermally activated persulfate; TOC, total organic carbon; TBA, tert-butyl alcohol
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