不同pH值制备的TiO2和TiO2/SiO2催化剂结构、表面性质及光催化活性

doi:10.3866/PKU.WHXB20110621

摘要/Abstract

摘要：

以TiOSO₄和SiO₂溶胶为原料, 采用沉淀法用氨水调节pH值制备TiO₂和TiO₂/SiO₂催化剂. 制备的催化剂用X射线衍射(XRD), 扫描电镜(SEM), N₂吸附(BET), 紫外-可见(UV-Vis)漫反射光谱, 程序升温脱附(NH₃-TPD), 傅里叶变换红外(FT-IR)光谱技术分析. XRD谱图显示纯TiO₂中锐钛型和金红石相共存, 且金红石相含量随pH值升高而增加. 但是, TiO₂/SiO₂催化剂只有锐钛型. 扫描电镜发现制备的催化剂呈类球形, 颗粒间相互交叠, 粒径在10-25 nm之间. TiO₂和TiO₂/SiO₂光催化剂的比表面积随pH值升高略有增大. SiO₂的添加会增大催化剂的比表面积. 程序升温脱附实验结果说明催化剂的表面酸量随pH值升高而增加. TiO₂/SiO₂的表面酸量比相同pH值制备的TiO₂大. 红外光谱分析说明Si掺杂和高pH值有利于催化剂表面生成更多的羟基. TiO₂和TiO₂/SiO₂光催化剂的催化活性随pH值升高而明显增强. TiO₂/SiO₂的光催化活性优于TiO₂. TiO₂/SiO₂催化剂具有较好的耐久性.

关键词: pH, TiO₂, SiO₂掺杂, 微结构, 表面性质, 光催化

Abstract:

TiO₂ and SiO₂-doped TiO₂ (TiO₂/SiO₂) catalysts were prepared using aqueous solutions containing a TiOSO₄ and/or SiO₂ sol in which NH₃·H₂O was used to adjust the pH value by a precipitation method. The as-synthesized photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption (BET), UV-Vis diffuse reflectance spectroscopy, NH₃ temperature programmed desorption (NH₃-TPD), and Fourier transform infrared (FT-IR) spectroscopy. The XRD patterns showed that anatase and rutile coexisted in the as-prepared TiO₂ and the rutile phase content increased with the increase in pH value. However, only anatase-TiO₂ was observed in the TiO₂/SiO₂ catalysts. SEM revealed that the surface morphology of the particles was a sub-spherical shape and some agglomeration occurred on the surface while the particle size was mostly between 10 and 25 nm. Surface area measurements showed that the surface areas of the catalysts increased slightly with the increase in pH value. The incorporation of SiO₂ increased the surface area. NH₃-TPD analysis indicated that the amount of surface acid increased as the pH increased. The amount of surface acid on SiO₂-doped TiO₂ was higher than that on TiO₂ when they were prepared at identical pH values. The addition of silica and the high pH value environment led to more surface hydroxyl groups on the catalysts as determined by FT-IR spectroscopy. The photocatalytic activity of the catalysts improved remarkably with the increase in pH value. The photocatalytic activity of SiO₂-doped TiO₂ is better than that of TiO₂. The TiO₂/SiO₂ catalyst has better durability.

Key words: pH, TiO₂, SiO₂-doping, Microstructure, Surface property, Photocatalysis

MSC2000:

O643

仇伟, 任成军, 龚茂初, 侯云泽, 陈耀强. 不同pH值制备的TiO₂和TiO₂/SiO₂催化剂结构、表面性质及光催化活性[J]. 物理化学学报, 2011, 27(06): 1487-1492.

QIU Wei, REN Cheng-Jun, GONG Mao-Chu, HOU Yun-Ze, CHEN Yao-Qiang. Structure, Surface Properties and Photocatalytic Activity of TiO₂ and TiO₂/SiO₂ Catalysts Prepared at Different pH Values[J]. Acta Phys. -Chim. Sin., 2011, 27(06): 1487-1492.

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不同pH值制备的TiO₂和TiO₂/SiO₂催化剂结构、表面性质及光催化活性

Structure, Surface Properties and Photocatalytic Activity of TiO₂ and TiO₂/SiO₂ Catalysts Prepared at Different pH Values

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