掺铜方法对二氧化钛光催化氧化还原性能的影响

采用浸渍法、水解沉淀法、机械混合法制备了铜掺杂的TiO2光催化剂.利用XRD,XPS,TPR等手段对不同样品进行了表征,以乙酸水溶液的光催化氧化降解及二氧化碳光催化还原为反应探针,对3种催化剂光催化活性进行了评价.结果表明,不同方法掺铜影响催化剂表面性质如吸附氧、元素价态及分布,进而影响光催化性能.吸附氧的性能以及存在合适比例的氧化还原对Cu+/Cu2+导致浸渍法制备的掺铜TiO2光催化剂具有最好的光催化活性.

Photocatalytic Activity of Copper Doping TiO2 Prepared by Several Methods

The copper doping titanium dioxide was prepared by immersion,hydrolysis-precipitation and physical mixing methods.The structural properties of these catalysts were characterized by means of XRD,XPS,TPR and SEM,and the photocatalytic activity was evaluated with the degradation reaction of acetic acid and photocatalytic reduction of carbon dioxide as probes.The experimental results show that the different doping methods lead to different surface properties such as adsorption oxygen,the valence and distribution of elements,which affect the recombination of the reductive electron/hole pairs,thus to further affect the photocatalytic activity.The high degree of dispersion of copper species,the enhancement of adsorption oxygen and the existence of perfect proportion of Cu~+ to Cu~(2+) are regarded to be responsible for the excellent activity of the copper-dopped catalyst prepared by immersion method.