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/K_(2)S_(2)O_(8))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/K_(2)S_(2)O_(8)降解苯甲羟肟酸的影响较小;常见阴离子(Cl-、NO_(3)^(-)、HCO_(3)^(-))抑制了药剂的降解,阳离子Fe^(2+)、Cu^(2+)促进了药剂的降解;UV/K_(2)S_(2)O_(8)体系中起主要氧化作用的活性物质是SO_(4)·^(-),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。
Ultraviolet light activated persulfate system was adopted to conduct experimental research on the degrada⁃tion of benzhydroxamic acid.The effect of different factors containning light sources,light intensity,desages of oxi⁃dant and pH on the removal of benzhydroxamic acid was studied detailly.The experimental mechanism and degrada⁃tion products were also discussed.The experimental results showed that under different lighting conditions,the mer⁃cury 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/K_(2)S_(2)O_(8))would pro⁃mote 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/K_(2)S_(2)O_(8).Common anions(Cl-,NO_(3)^(-),HCO_(3)^(-))would inhibit the degra⁃dation of the reagent while cations Fe^(2+)and Cu^(2+)would promote the degradation of the reagent.The active substance SO_(4)·^(-)played a major oxidation role in the UV/K_(2)S_(2)O_(8) system.The degradation process produced intermediate prod⁃ucts,which were removed in further degradation.
作者
万志豪
潘家豪
王春英
余文
WAN Zhihao;PAN Jiahao;WANG Chunying;YU Wen(Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control,Ganzhou 341000,China;College of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2022年第7期118-124,共7页
Industrial Water Treatment
基金
国家大学生创新创业训练计划项目(202010407004)
江西理工大学清江青年英才支持计划项目(JXUSTJYX2016003)。
关键词
苯甲羟肟酸
光降解
紫外/过硫酸钾降解
选矿废水
benzohydroxamic acid
photodegradation
ultraviolet/potassium persulfate degradation
mineral process⁃ing wastewater
