Degradation of methylene blue in aqueous dispersion of hollow titania photocatalyst: optimization of reaction by peroxydisulfate electron scavenger.
Degradation of methylene blue in aqueous dispersion of hollow titania photocatalyst: optimization of reaction by peroxydisulfate electron scavenger.
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DOI：
10.1016/j.jcis.2007.04.027
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发表时间：
2007-09
影响因子：
9.9
通讯作者：
A. Syoufian;K. Nakashima
中科院分区：
文献类型：
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作者：
A. Syoufian;K. Nakashima
以磺化聚苯乙烯乳胶粒为模板，采用溶胶-凝胶法合成了亚微米级二氧化钛空心球。以亚甲基蓝（MB）光催化降解反应为研究对象，考察了电子捕获剂对空心球光催化活性的影响。过硫酸盐作为电子捕获剂的加入显著提高了二氧化钛空心球的光催化活性。MB的光分解速率常数增加了2倍以上，通过加入过硫酸盐。光分解率的显着增加似乎与电子清除以及生产额外的氧化物种。研究发现，过硫酸盐的最佳浓度为10 mM。由于过量的SO42 −物质会使反应速率饱和，因此不建议进一步增加过硫酸盐的浓度。
The submicrometer-sized titania hollow spheres have been synthesized by employing sulfonated polystyrene latex particles as a template in sol–gel method. Photocatalytic activity of the hollow spheres was investigated by focusing on the effect of electron scavengers in the photocatalytic decomposition of methylene blue (MB). Photocatalytic activities of titania hollow spheres were significantly enhanced by the addition of peroxydisulfate as an electron scavenger. The rate constant for photodecomposition of MB was increased more than two times by the addition of peroxydisulfate. The significant increase in the photodecomposition rate seems to be related to electrons scavenging as well as production of additional oxidizing species. It was found that the optimum concentration of peroxydisulfate was 10 mM. Further increase in the concentration of peroxydisulfate is not recommended due to the saturation of reaction rate by the excess amount of SO42−species.