纳米TiO_2催化DBD等离子体氧化降解水中亚甲基蓝  

Nano TiO_2 catalyzes DBD plasma oxidating and degrading the methyl blue in water

作　　者：李坚 杨长河[1] 曹定龙 胡金根 LI Jian;YANG Changhe;CAO Dinglong;HU Jingen(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学建筑工程学院,江西南昌330031

出　　处：《南昌大学学报（工科版）》2018年第3期232-238,共7页Journal of Nanchang University(Engineering & Technology)

摘　　要：以负载于颗粒活性炭(GAC)上的纳米二氧化钛(TiO_2)作为催化剂,研究了其对介质阻挡放电(DBD)等离子体氧化降解水中亚甲基蓝的催化性能。考察了峰值电压、溶液电导率、催化剂投量等因素对去除率的影响,测定了溶液p H值及化学需氧量(COD_(Cr))的变化,对降解中间产物的进行了分析,并探讨了亚甲基蓝的降解路径。结果表明:TiO_2的催化作用,能够大幅提高处理效果;峰值电压越高、催化剂投量越大,亚甲基蓝的去除效率越高;溶液电导率对亚甲基蓝去除率具有正、反两方面的影响;在优化的实验条件下,处理35 min后去除率高达98.45%;亚甲基蓝分子受到活性粒子的攻击而发生断键、开环行为,产生亚联苯、萘、邻苯二甲酸丁基异丁基酯、(Z)-14-甲基-8-十六碳烯-1-缩醛、2-苯基十三烷、芥酸酰胺等中间产物,继而被矿化。This paper investigates the photocatalytic property of nano titanium dioxide （TiO2） loaded on granu- lar activated carbon （GAC） during methylene blue in water degradated by dielectric barrier discharge （DBD）.We studied the influence of peak pulse voltage, conductivity of solution and catalyst dosage to the removal rate, meas- ured the changes of pH value and chemical oxygen demand （CODcr）, then discussed the degradation pathway of methylene blue through analyzing degradation intermediates in this paper.The results show that the catalytic effect of TiO2 can significantly improve the treatment effect, the removal efficiency of methylene blue improves with the in- creasing of peak pulse voltage and catalyst dosage.conductivity of solution has positive and negative effects on the methylene blue removal rate at at the same time.After a treatment for 35 minutes under the optimized experimental conditions,the removal rate of methylene blue reaches up to 98.45%; Methylene blue molecules were attacked by active particle, then there came to keys breaking, loops opening and generated biphenylene, naphthalene, “ 1,2- benzenedicarboxylic acid,buty 1 2-methylpropyl ester”,“8-hexadecenal, 14-methyl-, （Z）-”, “benzene, （ 1- methyldodecyl）-” ,“ 13-docosenamide, （Z） ” and other intermediates,and then mineralized.

关 键 词：二氧化钛 颗粒活性炭 等离子体 亚甲基蓝 介质阻挡放电 

分 类 号：X703[环境科学与工程—环境工程]