摘要
研究了碳黑改性TiO2(CB-TiO2)薄膜催化剂光催化臭氧氧化典型有机污染物邻苯二甲酸二丁酯的过程,重点研究了臭氧投加量对邻苯二甲酸二丁酯浓度降解和总有机碳(TOC)去除率的影响.结果表明,邻苯二甲酸二丁酯的光催化臭氧化(TiO2/UV/O3)过程的TOC去除率比光催化氧化(TiO2/UV)、单独臭氧化(O3)和光助臭氧化(UV/O3)过程明显增高.动力学研究表明,邻苯二甲酸二丁酯完全矿化过程遵循零级反应,仅取决于臭氧浓度而与邻苯二甲酸二丁酯浓度无关;邻苯二甲酸二丁酯在TiO2/UV/O3作用下完全矿化的速率常数是UV/O3过程的1.2～1.76倍(同样臭氧浓度下),是TiO2/UV过程的2.24～3.54倍.
The photocatalytic activity of the carbon black modified nano-TiO2 （CB-TiO2） thin films was 1.5 times higher than that of TiO2 thin films in degrading Reactive Brilliant Red X-3B. Photocatalytic ozonation of dibutyl phthalate （DBP） over CB-TiO2 thin films supported on AI sheet was investigated. The ozone concentrations had an important effect on TOC removal of DBP. The experiments showed that combined photocatalysis with UV irradiation and ozonation （TiO2/UV/O3） considerably increased TOC removal compared to combined photocatalysis with UV irradiation （TiO2/UV）, ozonation alone （O3）, combined ozonation and UV irradiation （UV/O3）. The kinetic study showed the complete mineralization of dibutyl phthalate followed pseudo-zero-order kinetics and this only depended upon ozone concentration and indicated that DBP concentration did not affect the kinetics during UV/O3 and TiO2/UV/O3. The rate constants in the complete mineralization of DBP with TiO2/UV/O3 were 1.2 - 1.76 times higher than with UV/O3 with the same concentration of ozone. The rate constants were 2.24 - 3.54 times higher than with TiO2/UV.
出处
《高技术通讯》
CAS
CSCD
北大核心
2005年第8期55-60,共6页
Chinese High Technology Letters
基金
国家高技术研究发展计划(863计划)，国家自然科学基金
