铁掺杂钛基反蛋白石材料的性能表征及其可见光催化活性

Effect of Fe doping on the photocatalytic activity of titania inverse opal under visible light irradiation

采用溶胶凝胶法制备了不同掺杂比的铁掺杂二氧化钛反向蛋白石结构材料,通过扫描电镜,X射线能谱及紫外可见分光光度仪等对掺杂前后的样品进行比较,并采用罗丹明-B作为降解底物,对掺杂后样品在可见光下的光催化降解活性进行了研究。结果表明,铁掺杂后,样品的吸收带边发生红移,光响应区域扩展至550 nm,且样品中表面羟基氧的含量最高可提高到40%。铁掺杂样品的催化活性明显优于未掺杂的样品,其中掺杂比为10%的样品光催化降解活性最高,经可见光照射4 h后,其降解率可达85%以上。

Fe-doped titania inverse opal（TIO） materials with different doping ratios have been prepared by a sol-gel method.The products were characterized by scanning electron microscopy,X-ray photoelectron spectroscopy,and UV-Vis spectroscopy.By using Rhodanmine-B as a model pollutant,the effects of Fe doping on the photocatalytic activity under visible irradiation were studied.The results indicated that the presence of Fe induced a red-shift of the absorption edge,as a result of which the photoresponse region was extended to 550 nm.In addition,Fe doping resulted in an increase in the content of surface hydroxyl group on the TiO2 surface of up to 40%.The photodegradation experiments showed that the visible photocatalytic activity of Fe-doped TIO is superior to that of the undoped sample.The 10% Fe-doped TIO exhibited the highest efficiency,giving a degradation extent of 85% under visible light irradiation for 4 hours.