摘要
采用溶胶-凝胶法制备了掺杂Zn2+的TiO2复合半导体,用X射线衍射和拉曼光谱对其微晶结构进行表征,并掺杂不同金属离子对复合半导体进行调变。以活性艳红K-2BP为模型降解物,在固定催化剂投加量、通气量和pH的条件下,考察了Zn2+与Ce4+、La3+、Fe3+掺杂量对ZnO-TiO2光催化活性的影响。结果表明,Zn2+掺杂使TiO2衍射峰宽化、蓝移且峰强减弱,晶粒径减小。当Zn2+掺杂量为20.0%时,对活性艳红30 min的降解率为97%,表观反应速率常数k值达到了0.133 min-1,为TiO2的1.4倍。La3+、Fe3+、Ce4+掺杂可提高ZT的活性,其中,当La3+掺杂量为0.5%时,k值为ZT的1.4倍。
The Zn^2＋ -doped TiO2 coupled semiconductor was prepared by Sol-Gel method and its microcrystal structure was characterized by X-Ray diffraction and Raman spectroscopy. On this basis, coupled semiconductor was adjusted through doping with different metal ions. With the reactive brilliant red K- 2BP as the simulacrunm, the effect of Zn^2＋ and Ce^4＋ , La^3＋ , Fe^3＋ doping amounts on photocatalytic activity of ZnO-TiO2 was studied under the fixed photocatalyst amount, air flow rate and pH value. The results show that, Zn^2＋ -doping can cause the diffraction peaks of TiO2 widening, blue shift, the diffraction intensity weakened and the grain size decreased. The reactive red K-2BP can be degradated to 97% within 30min when Zn^2＋ doping content is 20.0%. The apparent rate constant reaches 0. 133min^-1 which is 1.4 times to TiO2. La^3＋ , Fe^3＋ and Ce^4＋ doped can further enhance ZT photocatalytic activity. Among them, the value is 1.4 times to ZT when La^3＋ doping content is 0.5 %.
出处
《西安理工大学学报》
CAS
北大核心
2009年第1期8-12,共5页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(50579061)
陕西省教育厅专项基金资助项目(07JK248)
关键词
氧化锌
氧化钛
复合半导体
光催化活性
活性艳红
Zinc oxide
titania
coupled semiconductor
photocatalytic activity
reactive red
作者简介
程刚（1965-），男，陕西西安人，副教授，博士生，研究方向为水污染控制技术。E—mail：w_environment@163．com。
周孝德（1960-），男，江西玉山人，教授，博导，博士，研究方向为水染污控制和环境水力学。E-mail：zhouxd@mail．xaut．edu．cn。
