摘要
以钛酸四丁酯为前驱体,天然凹凸棒石为载体,采用溶胶凝胶法制备了TiO2/凹凸棒石复合光催化剂,并用XRD、TEM对其进行表征。以亚甲基蓝染料为模拟污染物,采用300W汞灯为紫外光源,以光催化实验来评价该催化剂的活性,并研究了H2O2的引入对光催化活性的影响。实验结果表明,H2O2能显著提高染料的脱色效率:亚甲基蓝的初始浓度为50mg/L,催化体系为2mmol/LH2O2+0.5g/LTiO2/凹凸棒石+UV(紫外线),光催化10min后其脱色率为95%,相对于单独的0.5g/LTiO2/凹凸棒石+UV催化体系,其脱色率提高了约50%。全波段扫描显示,加入H2O2后,亚甲基蓝在290nm对应的苯环吸收峰急剧下降,665nm对应的最大吸收峰则近乎消失,且没有新的吸收峰产生。
In this study, tetrabutyl titanate was selected as precursor, and palygorskite was selected as carrier. TiO2 paJygorskite composites were prepared by sol-gel method, and samples were characterized by XRD and TEM. The applicability of H2O2 to increase the efficiency of TiO2/palygorskite photocatalytie degradations was investigated, and Methylene Blue in aqueous solution was used as a model for this purpose. It was proved that H2O2 can rapidly increase the efficiency of degradation. When the initial Methylene Blue＇ s concentration was 50 rag/L, the degradation rate of 2 mmol/L H2O2 ＋0. 5 g/L TiO2 palygorskite ＋ UV photocatalysis system reached 95% , which enhanced about 50% compared to 0.5 g/L TiO2/palygorskite ＋ UV photocatalysis system in 10min. The UV-VIS scanning showed that the absorption peak of benzene ring decreased sharply, and the peak at 665 nm almost disappeared at the present of H2O2, then no new absorption peaks could be detected.
出处
《矿物学报》
CAS
CSCD
北大核心
2009年第4期424-429,共6页
Acta Mineralogica Sinica
基金
国家自然科学基金(批准号:40772031
40672027)
863项目(2007AA06Z118)
