Zn、S共掺杂对TiO<sub>2</sub>纳米颗粒结构和光解甘油水溶液制氢性能的影响

摘要

以钛酸丁酯、硝酸锌和硫脲为原料，采用溶胶-凝胶法制备了不同n（Zn）/n（Ti）的Zn、S共掺杂的TiO₂光催化剂。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、激光拉曼光谱（FT-Raman）、紫外-可见漫反射（UV/vis DRS）等对催化剂的结构和光吸收性能进行了表征。结果显示，Zn和S在TiO₂纳米颗粒中均匀分布，Zn以ZnO形式存在，而S以SO₄^2-形式存在，共掺杂未改变TiO₂的锐钛矿结构。Zn和S共掺杂后，TiO₂纳米颗粒的晶粒变小。由于Zn的掺杂，在TiO₂禁带中产生了杂质能级，降低了纳米材料的禁带宽度，抑制了光生电子和空穴的复合，从而提高了光吸收效率。而S的掺杂，增加了催化剂表面的酸性位，有利于光催化活性的提高。掺杂了Zn、S的TiO₂光催化甘油水溶液制氢的效率远高于纯TiO₂。在氙灯照射下，3%Zn、S共掺杂催化剂的产氢速率可达到150.5 μmol/（h·g）。

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	邓文燕
	辛亚
	王希涛

关键词：二氧化钛；纳米颗粒；光催化；制氢；甘油水溶液

Abstract：

A series of Zn, S-doped TiO₂nanoparticles with different Zn/Ti molar ratios were synthesized by a sol-gel method. The structural and optional properties of the as-prepared photocatalyst were characterized by TEM, SEM, XRD, XPS, Raman and UV-Vis DRS. The results show that the doping Zn existed as the formation of ZnO, and the S existed as SO₄^2-. The doping nanoparticles have uniform diameter of 10—30 nm. And with the increase of the Zn/Ti mole ratio, the diameter of the nanoparticles declined. At the same time, the dope of Zn and acidic sites on the surface of TiO₂ strongly affected photo catalytic performance of the Zn-TiO₂ nanoparticles. Under the same conditions, the TiO₂ nanoparticles with Zn doped exhibited a higher photocatalytic activity for H₂ evolution from glycerol/water mixture than the bare TiO₂ nanoparticles. The 3% Zn-doped TiO₂ had a maximum H₂production rate of rate of 150.5 μmol/(h·g).

Keywords： titanium dioxide； nanoparticles； photocatalytic； hydrogen production； glycerol solution

Received 2014-11-04;

Fund:

国家自然科学基金（21276190和20806059）。

Corresponding Authors: 王希涛,E-mail: wangxt@tju.edu.cn。 Email: wangxt@tju.edu.cn

About author: 邓文燕(1988-),女,硕士研究生,研究方向为工业催化。

引用本文:

邓文燕, 辛亚, 王希涛.Zn、S共掺杂对TiO₂纳米颗粒结构和光解甘油水溶液制氢性能的影响[J]. 化学工业与工程, 2016,33(5): 14-20

Deng Wenyan, Xin Ya, Wang Xitao.Effects of Zn, S Codoping on the Structure of TiO₂ and Photocatalytic Performance for Hydrogen Production from Glycerol Solution[J]. Chemcial Industry and Engineering, 2016,33(5): 14-20

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