UV与UV/TiO_(2)降解马拉硫磷的试验研究  

Experimental study on degradation of malathion by UV and UV/TiO_(2)

作　　者：熊倪 徐坚 姜勇 滕洁 王甫洋 刘宁 XIONG Ni;XU Jian;JIANG Yong;TENG Jie;WANG Puyang;LIU Ning(College of Chemistry and Life Science,Jinling College,Nanjing University,Nanjing 210089,China;School of Environment,Nanjing University,Nanjing 210023,China)

机构地区：[1]南京大学金陵学院化学与生命科学学院,南京210089 [2]南京大学环境学院,南京210023

出　　处：《工业用水与废水》2022年第3期27-31,共5页Industrial Water & Wastewater

基　　金：南京大学金陵学院教学改革项目(0010521814)。

摘　　要：采用UV与UV/TiO_(2)降解马拉硫磷,并对降解过程中的溶液进行了生物毒性测试,探究UV降解马拉硫磷的效率、影响因素以及降解液的毒性变化规律。结果表明:UV降解马拉硫磷的过程属于一级反应动力学;同等条件下,马拉硫磷初始浓度越高,降解效率越高;碱性条件下降解速率高于酸性条件,pH值在5~9范围内升高,降解速率随之变快,但是,当降解足够长时间,最终降解效率与pH值关系不显著;提高电源功率,初始阶段降解速率明显加快,随着降解时间的延长,电源功率对降解效率的影响不再显著;降解过程中,溶液毒性随降解时间的延长呈先变大后变小的趋势;加入纳米TiO_(2)可显著加快UV降解马拉硫磷的速率,降解8 min后,降解率达到87.6%,另外,纳米TiO_(2)的投加量越大降解速率越快,但过量也会抑制降解效率。Using UV and UV/TiO_(2) to degrade malathion,the biological toxicity of the solution produced during the degradation process were tested,the efficiency of UV degrading malathion,the influencing factors,and the toxicity variation rule of the degradation liquid were investigated.The results showed that,the degradation process of malathion by UV belongs to first order reaction kinetics.Under the same conditions,the higher the initial concentration of malathion,the higher the degradation efficiency would be;the degradation rate under alkaline condition was faster than that under acidic condition,when the pH value was in the range of 5-9,the degradation rate increased with the increasing pH value.However,when the degradation time was long enough,the relationship between final degradation rate and pH value was not significant.Increasing the light intensity,the degradation rate accelerated obviously in the initial stage;during the degradation process,the toxicity of the solution increased firstly and then decreased with the prolonging of the degradation time.The addition of nano-TiO_(2) could significantly accelerate the degradation rate of malathion by UV,which could reach 87.6%within 8 min.In general,the higher the dosage of nano-TiO_(2),the faster the degradation rate will be,but excessive dosage will also reduce the degradation efficiency.

关 键 词：有机磷农药 马拉硫磷 光催化 二氧化钛 明亮发光杆菌 

分 类 号：X703.1[环境科学与工程—环境工程]