摘要
以胱氨酸为掺杂剂,利用溶胶-凝胶法直接制备了N、S共掺杂改性的光催化剂TiO2-N-S,借助XRD、XPS和SPS等手段对其进行了表征,并以苯酚为模型污染物考察了其在模拟太阳光下的催化活性。XRD分析表明该光催化剂为锐钛矿晶型,N、S共掺杂能有效抑制TiO2晶粒的生长,提高了晶相间转变温度。XPS显示S是以S6+形式存在的,其掺杂方式是置换了晶格金属Ti4+形成阳离子S6+;N的峰形结构呈现宽化状态,形成了O—Ti—N和Ti—N—O键,且表面羟基含量显著提高。SPS研究结果表明,该催化剂的可见光吸收增强,吸收带边发生明显"红移"。模拟太阳光下降解苯酚的实验结果表明,该光催化剂在120min内对苯酚的降解率可高达79.3%。
Nitrogen and sulfur co-doped TiO2 photocatalyst （label as TiO2-N-S） was prepared by a sol-gel process using cystine as doping agent. The samples were characterized by the methods of X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, X-ray photoelec- tron spectroscopy （XPS） and surface photovohage spectrum （SPS） and the performance of the samples was tested by degradation for phenol solution under simulated sunlight irradiation. XRD analysis showed that the asprepared modified-catalyst was absolute anatase and co-doping with nitrogen and sulfur could efficiency restrain the growth of crystalline grain and enhance the temperature of phase transformation. XPS analysis displayed that sulfur existing as cationic S^6＋ by replacing Ti4- and the structure of nitrogen was broadening which could be attributed to the formation of O-Ti-N and Ti-N-O and also the content of the surface hydroxyl groups was remarkable increased. The light absorption band edge of TiO2-N-S in the visible-light region was clearly observed according to SPS analysis. Under the simulated sunlight irradiation with 120min, the 79.3% degradation rate of phenol could be achieved.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B02期11-14,共4页
Journal of Functional Materials
关键词
TIO2
模拟太阳光
光催化
共掺杂
苯酚
titanium dioxide
simulated sunlight
photocatalytic
co-doped
phenol
