Enhanced Radical Generation in an Ultraviolet/Chlorine System through the Addition of TiO2

反应性(心理学) 紫外线 动力学 降级(电信) 化学 无机化学 卤素 光化学 激进的 材料科学 有机化学 光电子学 病理 物理 电信 替代医学 医学 量子力学 计算机科学 烷基
作者
Hao-Chen Zhang,Yu-Lei Liu,Lu Wang,Zhuoyu Li,Xiaohui Lu,Tao Yang,Jun Ma
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:55 (17): 11612-11623 被引量:56
标识
DOI:10.1021/acs.est.0c08785
摘要

Ultraviolet (UV)/chlorine draws increasing attention for the abatement of recalcitrant organic pollutants. Herein, it was found that TiO2 would significantly promote the degradation of dimethyl phthalate (DMP) in the UV/chlorine system (from 19 to 84%). Hydroxyl radicals (HO•) and chlorine radicals (Cl•) were the dominant reactive species for DMP degradation in the UV/chlorine/TiO2 system. Chlorine decayed much faster in UV/chlorine/TiO2 compared with UV/chlorine, which is possibly because photogenerated electrons (ecb–) and superoxide radicals (O2•–) have high reactivity with chlorine. As a result, the recombination of photogenerated holes (hvb+) and ecb– was inhibited and the accumulation of HO• and Cl• was facilitated. A kinetic model was established to simulate the reaction process, and it was found that the concentrations of HO• and Cl• were several times to dozens of times higher in UV/chlorine/TiO2 than that in UV/chlorine. The contributions of HO• and Cl• to DMP degradation were 70.3 and 29.7% by model simulation, respectively, and were close to the probe experiment result. In the UV/chlorine/TiO2 system, the degradation of DMP did not follow pseudo-first-order kinetics but the degradation of benzoate fitted well with pseudo-first-order kinetics. This phenomenon was elucidated by the structure of the pollutant and TiO2 and further tested by calculating the adsorption energy (Eads)/binding energy (Eb) with density functional theory. Due to faster decay of chlorine, lower amounts of disinfection byproducts formed in UV/chlorine/TiO2 compared with UV/chlorine. Adding TiO2 into the UV/chlorine system can promote the degradation of recalcitrant organic pollutants in an aqueous environment.
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