胱氨酸改性TiO_2可见光下催化活性及催化机理.pdf

第26卷第12期
无机化学学报
Vol 26 No 12
2010年12月
CHINESE JOURNAL OF INORGANIC CHEMISTRY
2150-2154
胱氨酸改性TO2可见光下催化活性及催化机理
于秀娟*2程修文
(黑龙江大学环境科学与工程系,哈尔滨150080)
黑龙江普通高等学校高效转化的化工过程与技术重点实验室,哈尔滨150080)
摘要:以朓氨酸为掺杂剂,采用溶胶一凝胶法制备了胱氨酸改性的TO2可见光催化剂,并对其进行了TG-DTA、XRD、表面光电
压光谱(SPS)及XPS表征。XRD结果表明,胱氮酸有效抑制了TO2晶粒的生长,提高了锐铽矿向金红石相的转变温度。SPS分析
结果显示,改性TO2光催化剂可见光吸收増强,吸收带边明显红移,且胱氨酸用量为4.2%的样品光伏响应强度最大。XPS分析
结果表明,胱氨酸改性iO2样品表面的羟基含量明显增加,且O2p价带的VMB(价带最大值)值为2.3eV,小于非改性TO2。以
罗丹明B为模型污染物,考察了脱氨酸掺杂量与熇烧温度对改性TiO2在可见光下催化性能。结果表明,胱氨酸掺杂量(相对
TO2)为4.2%,350℃焙烧的催化剂催化活性最好。波长为380-630mm、470~800m的光辐射120min后,罗丹明B的降解率分
別达到91.02%、78.44%
关键词:光催化;YO2:朓氨酸:罗丹明B
中图分类号:0614.41:0613.51;0643.36
文献标识码:
文章编号:1001-4861(2010)12-2150-0
Mechanism and Photocatalytic Activity of Cystine-modified Tio2 with
Visible-light Response
YU Xiu-juan* 2 CHENG Xiu-wen
(Department ofenwironmentad Science and Engineering, Heilongjiang University, Harbin 150080)
Key Laboratory of Chemical Engineering Process Technology for High-efficiency
Conersion, College of Heilongjiang Prolince, Herbin 150080
Abstract: Ti0 nano-particles modified by cystine were prepared through a sol-gel procedure using cystine as the
doping species and characterized by TG-DTA, XRD, ur ace Photo-voltage Spectroscopy (SPS)and XPS. The
XRD results show that cystine added in Tio preparation could efe tively restrain the growth of crystallite and
enhance the temperature of phase transformation. SPS results indicate that the light absorbance edge of cystine
modified Tio2 nano-particles is obviously red-shifted to visible-light and the strongest signal intensity of
Photovoltaic response is given by modified Tio 2 nano-particle with 4.2% cystine. XPS analysis implies that the
content of surface hydroxyl increases significantly and VBM(Valance Bond Maximum) of 02p is 2.3 ev. The
effects of calcination temperature and cystine contenl on the visible-light photocatalytic performance of modifed
Ti0 for degrading RHB were investigated. The modified Tio2 calcined at 350cwith 42% cystine content exhibits
the best photocatalytic perforinance. When the irradiation wavelengths are 380-630 nm and 470-800 nm, the
removal rate for Rhb could achieve 91. 02% and 78. 44%, respectively.
Key words: photocatalytic; TIO: cystine; rhodamine B
随着社会经济的飞速发展,环境污染控制与治价、耐光和化学腐蚀而成为研究的热点,但其也存在
理成为人类亟待解决的重大课题。iO2因其高效、廉着一些缺陷:TO2属宽隙半导体,带隙能为3.2eV
收稿日期:2010-04-12。收修改稿!期:2010-08-26
黑龙江省高校青年学术骨干支持计划资助项目。
*通讯联系人。E-mail:hliyuxiujuan@126.com
第一作者:于秀娟,女、45岁,教授;研究方向:环境催化及清沽生产。