H2–O2 promoting effect on photocatalytic degradation of organic pollutants in an aqueous solution without an external H2 supply
H2–O2 promoting effect on photocatalytic degradation of organic pollutants in an aqueous solution without an external H2 supply
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DOI：
10.1016/j.apcata.2010.03.057
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发表时间：
2010-05
影响因子：
5.5
通讯作者：
Zizhong Zhang;Xuxu Wang;Jinlin Long;Z. Ding;Xianliang Fu;Xianzhi Fu
中科院分区：
文献类型：
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作者：
Zizhong Zhang;Xuxu Wang;Jinlin Long;Z. Ding;Xianliang Fu;Xianzhi Fu
为了制备无需外部H2supply也能快速降解有机污染物的h2o2促进体系，我们用一种由Pt/ tio2和一些具有水分解能力的辅助催化剂组成的协同催化剂代替纯Pt/ tio2光催化剂。在紫外光照射下，将协同催化剂用于有机污染物的光氧化，与纯Pt/ tio2催化剂相比，除甲酸外，水杨酸和苯酚的去除率均有所提高。不同金属氧化物作为辅助催化剂时，催化活性的提高取决于其促进h2释放的能力。采用荧光光谱法、光度法、气相色谱-质谱联用技术对合作体系进行了研究。结果表明，在协同催化剂作用下，H2O分子生成了更多的羟基自由基（OH）和过氧化氢（H2O2）。提出了有机污染物在协同催化剂上的光降解机理。
To fabricate the H2–O2promoting effect systems for quicker degradation of organic pollutants without an external H2supply, we replace pure Pt/TiO2photocatalyst by a cooperative catalyst composed of Pt/TiO2and some assistant catalysts with water-splitting ability. When the cooperative catalysts were used for the photooxidation of organic pollutants under UV light irradiation, enhanced activities were observed for salicylic acid and phenol removal, except for formate, as compared to pure Pt/TiO2catalyst. For different metal oxides as the assistant catalyst, an increase in the activity depended on their ability to promote H2release. The fluorescence spectroscopy and photometric techniques combind with GC–MS were applied to investigate the cooperative system. Results revealed that more hydroxyl radical (OH) and hydrogen peroxide (H2O2) were formed from the H2O molecules over a cooperative catalyst. A photodegradation mechanism of organic pollutants on a cooperative catalyst is proposed.