TiO2 nanosheet (NS) with exposed (001) facets was synthesized via a hydrothermal approach using titanate nanotube (NT)as the precursor and NaF as the shape controlling agent. Photocatalytic phenol degradation over the catalysts was investigated. Results showed that upon hydrothermal treatment NT was transformed to anatase NS with high (001) facets. In comparison with NT, NS displayed much higher photocatalytic activity for phenol degradation, and the catalytic activity increased with the hydrothennal temperature. Phenol degradation over NS followed first-order kinetics, and NS prepared at 200 ℃ had the highest rate constant of 0.083 min-1. Moreover, the dependency of phenol degradation rate on initial phenol concentration obeyed the LangmuiHinshelwood model, indicative of an adsorption controlling reaction mechanism.%以钛酸纳米管为前驱体,通过添加NaF高温水热合成了(001)面暴露的TiO2纳米薄片,并对其催化苯酚光降解行为进行了研究.结果表明经水热反应后,钛酸型TiO2:纳米管(NT)转晶成锐钛矿型TiO2纳米薄片(NS),且具有高(001)暴露面.和NT相比,NS对苯酚的光催化降解活性显著提高,其活性随水热温度升高而增加.NS光催化去除苯酚符合一级动力学.其中200 ℃合成的NS反应速率常数κ最高,为0.083 min-1.同时.苯酚的光催化反应初活性与其初浓度的关系符合Langmuir-Hinshelwood模型.表明苯酚的光催化降解受吸附控制.
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