摘要
在复合半导体基础上,采用超声浸渍法对催化剂表面作进一步铜改性,制备了铜锡改性的纳米二氧化钛光催化剂CuOx-SnO2/TiO2,考察了表面铜改性、二氧化锡复合对催化剂光催化氧化还原性能的影响.结果表明,表面铜改性和复合都有利于提高催化剂光催化氧化还原能力,二者间表现出相互增强的作用.结合XRD、XPS、TEM等催化剂表征结果,对铜锡改性纳米二氧化钛光激发机制进行了讨论,提出了二氧化碳光催化还原的可能机制.
TiO2 coupling with SnO2 was modified by impregnation method with aqueous solution of Cu（NO3）2 under ultrasonic irradiation, followed by calcinations at 450 ℃. The photocatalytic activity of the catalysts was evaluated using the reaction of photocatalytic oxidation of acetic acid as well as formaldehyde, and photocatalytic reduction of CO2. The results show that the photoeatalytic activity of TiO2 can be improved either by copper modified or coupling with SnO2. One of the two improvement methods is enhanced by the other. The catalysts were characterized by X-ray diffraction （XRD） , X-ray photoelectron spectroscopy （XPS） and transmission electron microscopy （TEM）. The mechanism for the improvement of CuOx-SnO2/TiO2 state was discussed and the possible route of photoeatalytic reduction of CO2 was proposed.
出处
《感光科学与光化学》
EI
CSCD
2006年第5期366-376,共11页
Photographic Science and Photochemistry
基金
中国船舶重工业集团第七一八研究所博士后科研工作站的资助
关键词
复合半导体
光催化氧化还原
铜表面改性
甲醛
乙酸
二氧化碳
coupled semiconductor
photocatalytic redox
acetic acid
copper modified
formaldehyde
carbon dioxide
