Degradation of benzhydroxamic acid by UV activated persulfate

doi:10.19965/j.cnki.iwt.2021-0961

Abstract

Abstract:

Ultraviolet light activated persulfate system was adopted to conduct experimental research on the degradation of benzhydroxamic acid.The effect of different factors containning light sources，light intensity，desages of oxidant and pH on the removal of benzhydroxamic acid was studied detailly. The experimental mechanism and degradation products were also discussed. The experimental results showed that under different lighting conditions，the mercury lamp had a better removal effect on benzhydroxamic acid than the xenon lamp，and the higher light intensity，the higher removal rate. The combined action of ultraviolet light and potassium persulfate（UV/K₂S₂O₈） would promote the removal of benzhydroxamic acid. The higher the concentration of benzhydroxamic acid，the lower removal rate， while the higher concentration of potassium persulfate，the higher removal rate. pH had less influence on the degradation rate of benzhydroxamic acid by UV/K₂S₂O₈. Common anions（Cl^-，NO₃ ^-，HCO₃ ^-） would inhibit the degradation of the reagent while cations Fe²⁺ and Cu²⁺ would promote the degradation of the reagent. The active substance SO₄ ^·- played a major oxidation role in the UV/K₂S₂O₈ system. The degradation process produced intermediate products，which were removed in further degradation.

Key words: benzohydroxamic acid, photodegradation, ultraviolet/potassium persulfate degradation, mineral processing wastewater

摘要：

采用紫外光活化过硫酸盐体系降解选矿药剂苯甲羟肟酸，考察了光源、光照强度、氧化剂投加量、pH等因素对苯甲羟肟酸去除效果的影响，并分析讨论了实验机理以及降解产物。结果表明：不同光照条件下，汞灯对苯甲羟肟酸的去除效果比氙灯好，且光照强度越高去除率越高；紫外光照和过硫酸钾（UV/K₂S₂O₈）的共同作用可显著促进苯甲羟肟酸的去除，且苯甲羟肟酸浓度越高去除率越低，过硫酸钾浓度越高去除率越高；pH对UV/K₂S₂O₈降解苯甲羟肟酸的影响较小；常见阴离子（Cl^-、NO₃ ^-、HCO₃ ^-）抑制了药剂的降解，阳离子Fe²⁺、Cu²⁺促进了药剂的降解；UV/K₂S₂O₈体系中起主要氧化作用的活性物质是SO₄ ^·-，苯甲羟肟酸在降解过程中产生苯甲酸等中间产物，中间产物进一步被降解转化。

关键词: 苯甲羟肟酸, 光降解, 紫外/过硫酸钾降解, 选矿废水

CLC Number:

X703.1

Zhihao WAN, Jiahao PAN, Chunying WANG, Wen YU. Degradation of benzhydroxamic acid by UV activated persulfate[J]. Industrial Water Treatment, 2022, 42(7): 118-124.

万志豪, 潘家豪, 王春英, 余文. 光助过硫酸盐氧化处理苯甲羟肟酸的研究[J]. 工业水处理, 2022, 42(7): 118-124.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0961

https://www.iwt.cn/EN/Y2022/V42/I7/118

Figures/Tables 9

Fig.1 Degradation effect of benzhydroxamic acid under different irradiation conditions

Fig. 2 Effect of K₂S₂O₈ dosage on the degradation of benzhydroxamic acid

Fig. 3 The change of total organic carbon during degradation of benzhydroxamic acid

Fig. 4 Effect of different initial mass concentrations on the degradation of benzhydroxamic acid

Fig. 5 Effect of initial pH on the degradation of benzhydroxamic acid

Fig. 6 Effect of anions on the degradation of benzhydroxamic acid

Fig. 7 Effect of cations on the degradation of benzhydroxamic acid

Fig. 8 Effect of quencher on degradation of benzhydroxamic acid

Fig. 9 Liquid chromatogram of benzhydroxamic acid at different degradation times

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