摘要
以活性炭为催化剂,采用微气泡催化臭氧化处理酸性大红3R,考察其处理性能和机理,并与微气泡以及传统气泡臭氧化处理性能进行了比较。结果表明:微气泡催化臭氧化可加速液相臭氧分解,其分解系数为0.093 min^(-1);同时氧化能力明显增强,其脱色速率和TOC去除速率常数分别为0.342 min^(-1)和0.0242 min^(-1),均显著高于微气泡和传统气泡臭氧化。微气泡催化臭氧化处理中,臭氧微气泡收缩破裂和活性炭催化的协同效应可强化·OH氧化反应,其对TOC去除的贡献率可达到75%。·OH捕获剂的存在使得微气泡催化臭氧化TOC去除率下降,其中Na2CO3的抑制作用最为显著。微气泡催化臭氧化中,臭氧利用效率和反应效率亦得到强化,平均臭氧利用率为98.3%,累积TOC去除量和臭氧消耗量比值R可达0.128 mg·mg^(-1)。GC-MS分析结果表明,微气泡催化臭氧化酸性大红3R降解途径包括偶氮键断裂、萘环/苯环开环、小分子有机酸矿化等过程。
The performance and mechanism of catalytic microbubble ozonation of acid red 3 R with activated carbon as catalyst were investigated,and its performance was compared with microbubble or coarse bubble ozonation.The results showed that catalytic microbubble ozonation could promote the decomposition of dissolved ozone with higher decomposition coefficient of 0.093 min^(-1),and improve oxidative ability with higher decolorization rate constant of 0.342 min^(-1)and TOC removal rate constant of 0.0242 min^(-1),than microbubble and coarse bubble ozonation.The synergistic effect of ozone microbubble breakage and activated carbon catalytic activity could enhance·OH oxidation in catalytic microbubble ozonation,which contributed to about75%TOC removal.Some·OH scavengers could reduce TOC removal rate by catalytic microbubble ozonation,of which Na2CO3 presented the highest inhibition.In catalytic microbubble ozonation,the ozone utilization efficiency and reaction efficiency also increased,the average ozone utilization efficiency could reach 98.3%,and the cumulative ratio of TOC removal amount to ozone consumption amount could reach 0.128 mg·mg^(-1).GC-MS analyses indicated that the degradation pathway of acid red 3 R in catalytic microbubble ozonation included the processes of azo bond cleavage,naphthalene/benzene ring breakage,and mineralization of low molecular organic acids.
作者
张静
钱泽朋
刘春
郭延凯
陈晓轩
刘苗奇
王晓菊
ZHANG Jing;QIAN Zepeng;LIU Chun;GUO Yankai;CHEN Xiaoxuan;LIU Miaoqi;WANG Xiaoju(Pollution Prevention Biotechnology Laboratory of Hebei Province,School of Environmental Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2021年第4期1199-1208,共10页
Chinese Journal of Environmental Engineering
基金
河北省自然科学基金项目(E2019208418)
河北省教育厅项目(QN2018257)。
