以硫脲作为N、S源,尿素作为水解调节剂,水热合成了N/S-TiO2催化剂.采用XRD、SEM、XPS等手段对产品进行了表征.产品分散后,以质量浓度为0.02 g·L-1的甲基橙水溶液为模拟污染物,采用UV-vis光谱,多点BET分析及光催化实验研究了所得产品的光催化活性效果.实验结果表明:S以-+-6价形式进入TiO2晶格取代Ti形成Ti-O-S键,N通过取代晶格中的O形成O-Ti-N键而改变了TiO2能带结构.当煅烧温度为500℃时,水热合成出的产品结晶度较高,粒径较小,约17nm左右.光催化活性实验结果表明:当紫外灯照射时间达到1.5h时,N/S-TiO2催化剂降解甲基橙溶液基本完成,脱色率达到96％/以上.
N/S-TiO2 catalysts were prepared by hydrothermal method with thiourea as the source of nitrogen and sulfur,and urea as hydrolysis modifier.The products were characterized by XRD、SEM and XPS.Photo-catalytic effect was evaluated by UV-vis spectrum,BET analysis and photo-catalytic experimental when MO solution was applied as simulation pollutant whose mass concentration was 0.02g · L-1.The experiment result showed that N and S substituted for Ti and O,respectively,in TiO2 lattice to form Ti-O-S(+6) and OTi-N.The product prepared was of smaller size of about 17 nm,when calcined temperature was 550℃.The photo-catalytic activity result indicated that when exposure time under UV light reached 1.5h,MO degradation completed thoroughly,and the decolorization rate reached higher than 96％.
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