微波水热法制备稀土元素铒掺杂TiO_2光催化剂及光催化活性  

Preparation of Er doped TiO_2 photocatalyst by microwave hydrothermal method and its photocatalytic activity

作　　者：卢月洁 张美[1] 毕先均 Lu Yuejie Zhang Mei Bi Xianjun(Institute of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, Yunnan, Chin)

机构地区：[1]云南师范大学化学化工学院,云南昆明650500

出　　处：《工业催化》2017年第2期27-32,共6页Industrial Catalysis

基　　金：国家自然科学基金(20663007)资助项目

摘　　要：采用微波水热法和溶胶-凝胶法制备稀土元素Er掺杂TiO_2光催化剂TiO_2-Er,以甲基橙溶液为模拟污染物,在微波辐射-紫外光照(MW-UV)和太阳光照条件下,考察TiO_2-Er光催化剂的光催化降解活性。分别用N_2吸附-脱附、ICP-AES和PL光谱分析对TiO_2-Er光催化剂进行结构测试和表征。结果表明,Er掺杂能显著提高TiO_2光催化剂光催化活性,微波水热法制备的TiO_2-Er光催化剂具有较高的光催化活性;微波水热法和溶胶-凝胶法制备的TiO_2-Er光催化剂微波辐射-紫外光照50 min,甲基橙降解率分别为100%和98.5%,太阳光照4 h,甲基橙降解率分别为99.0%和97.5%。微波水热法具有晶化时间短和元素掺杂均匀的优点,制备的TiO_2-Er光催化剂具有形貌均匀、孔径较大、孔分布均匀和比表面积较大等特点,且Er掺杂能抑制光生e^-/h^+复合,使光生e^-/h^+的分离效率得到提高,有利于光催化活性的提高。Erbium doped TiO2 photocatalysts were prepared by microwave hydrothermal method and sol- gel method. Using methyl orange as organic pollutant, the photocatalytic activities of TiO2-Er photocata- lysts were investigated respectively under the irradiation of microwave-ultraviolet （MW-UV） and sun light. The structure of ZiO2-Er photocatalysts were characterized by N2 adsorption-desorption, ICP-AES and PL spectral analysis. The results showed that Er doped could obviously increase the photocatalytic activity of catalyst and TiO2-Er photocatalyst prepared with microwave hydrothermal method had higher photocatalytic activity. The degradation rates of methyl orange on TiO2-Er prepared by two methods were 100% and 98.5% respectively under the condition of MW-UV irradiation for 50 min,while the degrada- tion rate of methyl orange were 99.0% and 97.5% respectively under the sun light for 4 h. Because the microwave hydrothermal method had the advantages of short time of crystallization and the uniform of element doping and so on, TiO2-Er photocatalyst prepared by this method possessed the characteristics of uniform morphology, larger pore size, uniform pore size distribution and larger specific surface area. Er doped could inhibit recombination of photo-induced electrons and holes, and improve the separation efficiency of hole-electron pairs, causing the higher photocatalytic activity of TiO2-Er.

关 键 词：催化化学 微波水热法 稀土元素铒 掺杂改性 TIO2光催化剂 光催化活性 

分 类 号：Q643.36[生物学—生物物理学] TQ034[化学工程]