碱热联合活化过硫酸钠氧化降解2,4-二氯苯酚研究  

Study on Oxidative Degradation of 2,4-Dichlorophenol by Alkaline and Thermal Co-activated Sodium Persulfate

作　　者：周阳 应路瑶 于欣 郑文睿 祖丽呼玛尔·木沙江 肖鹏飞[1] ZHOU Yang;YING Luyao;YU Xin;ZHENG Wenrui;ZULHUMAR Musajan;XIAO Pengfei(College of Forestry,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040

出　　处：《水处理技术》2021年第3期68-72,共5页Technology of Water Treatment

基　　金：中央高校基本科研业务费专项资金项目(2572017CA08);国家自然科学基金项目(41201307);国家级大学生创新创业训练计划项目(201810225115)。

摘　　要：以水中的2,4-二氯苯酚(2,4-DCP)为目标污染物,比较了多种方式活化过硫酸盐氧化降解效果,探讨了碱热活化过硫酸钠氧化降解水中2,4-DCP的影响因素及自由基降解机理。结果表明,相同时间内碱热联合活化过硫酸钠对2,4-DCP降解效果要优于单一碱、热和紫外活化过硫酸钠的降解效果,在p H为9、60℃条件下处理180 min后的降解率达到97.83%。碱热活化过硫酸盐对2,4-DCP的降解效果随着过硫酸钠的投加量的增加而增加,但随着初始2,4-DCP含量的增加而降低。CO_(3)^(2-)可促进2,4-DCP的氧化降解,0.5 mol/L的CO_(3)^(2-)可提高降解率20%以上。在p H为9、60℃的碱热活化降解条件下,SO4^(-)·和HO·共存于体系中降解2,4-DCP,其中HO·起主导作用。Taking 2,4-DCP in water as the target pollutant,the oxidative degradation effects of persulfate activated by various methods were compared,the influencing factors and free radical degradation mechanism of 2,4-DCP in water oxidative degradation by sodium persulfate with alkaline-thermal co-activation were discussed.The results showed that,the degradation rate of 2,4-DCP by alkaline and thermal co-activated Na2 S2 O8 was higher than that of the alkaline,thermal and ultraviolet activation.The degradation rate reached 97.83%after 180 min at pH was 9 and 60℃.The 2,4-DCP degradation rate by alkaline and thermal co-activated Na_(2)S_(2) O8 was increased with the increase of Na_(2)S_(2) O8 dosage,but decreased with initial content of 2,4-DCP.Moreover,the degradation efficiency of 2,4-DCP was improved by addition of CO_(3)^(2-),and degradation rate was increased by more than 20%with CO32-of 0.5 mol/L.Under the alkaline thermal activation degradation conditions of pH of 9 and 60℃,SO4^(-)·and HO·coexist in the system to degrade 2,4-DCP,and HO·played a leading role.

关 键 词：过硫酸盐 2 4-二氯苯酚 碱热活化 氧化降解 硫酸根自由基 

分 类 号：X703.1[环境科学与工程—环境工程]