Nitrate-induced Photodegradation of Colorants and the Corresponding Mechanisms Study

文献类型： 外文期刊

第一作者： Hu, Wenna

作者： Hu, Wenna;Liu, Wei;Wu, Fan;Liu, Jian

作者机构：

关键词： Nitrate;Oxidation Property;Mechanisms;Photodegradation;Colorants

期刊名称：JOURNAL OF ADVANCED OXIDATION TECHNOLOGIES （ 影响因子：0.901； 五年影响因子：0.794 ）

ISSN： 1203-8407

年卷期： 2018 年 21 卷 1 期

页码：

收录情况： SCI

摘要： In this paper, we first report effects of impact parameters on the oxidation property of photoinduced nitrate anion via degradation of multifarious colorants and indicators. While no degradation efficiencies are observed with respect to photoinduced nitrite instead of nitrate in the experiment. Several fundamental aspects regarding the effects of different structures of colorants, types of nitrate salt, illumination time and dosage of nitrate ion on the oxidation property were explored. The spectral evolution of UV-vis absorption was also investigated along with the degradation kinetics. Remarkably, this photoinduced nitrate ion played a major role in the fine oxidation property, and cations with greater extent of hydrolyzation would give rise to a more enhanced oxidation performance. The photodegradation of methyl orange and rhodamine B follows the zero-order and first-class dynamic equation, respectively. The maximum absorption peaks of dyes in visible light shifts towards shorter wavelengths as the illumination time increases. center dot OH radicals generated from photoinduced aqueous nitrate and center dot O-2(-) originated from the reaction of center dot NO32- with dissolved oxygen were examined by EPR measurements, and they played a significant role in the photooxidation performance. This finding may provide new insights for treatment of industrial wastewater with good economic benefit and has potential application values in the field of photoreaction and photocatalysis.

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