Abstract

Sol-gel process with continuous ultrasonication was used to produce pure and vanadium doped titania powders. The amount of vanadium doped in titania was varied by using different initial concentrations of vanadium solutions. Scanning electron microscopy and particle size analyses showed formation of spherical shaped particles with diameter ranging from 3 to 11 nm. The average pore volume was 0.0248 cm³/g, and the surface areas of pure and V-doped titania were 62.9 and 66.1 m²/g, respectively. The maximum amount of vanadium doped on titania catalyst, as determined using energy dispersive X-ray spectroscopy was 1.7 wt%, and the X-ray diffraction patterns showed the presence of mainly anatase form of titania. The photocatalytic activities of pure and V-doped titania were tested for methylene blue, and the metal uptake was found to increase from 10 mg/g for pure titania to 17 mg/g for V-doped titania. Adsorption isotherms for removal of lead and zinc from aqueous solutions were generated under ultraviolet exposure for 24 h, and the results revealed that the photocatalytic activity was enhanced when titania was doped with vanadium.

摘要

使用具有连续超声的溶胶-凝胶工艺来生产纯钒掺杂的二氧化钛粉末。通过使用不同的初始钒溶液浓度来改变二氧化钛中掺杂的钒的量。扫描电子显微镜和粒度分析表明形成了直径为3至11nm的球形颗粒。平均孔体积为0.0248cm³/ g，纯和V掺杂的二氧化钛的表面积分别为62.9和66.1 m ²/ g。使用能量分散X射线光谱法测定，二氧化钛催化剂上掺杂的钒的最大量为1.7重量％，并且X射线衍射图表明主要存在锐钛矿形式的二氧化钛。测试了纯和V掺杂的二氧化钛对亚甲基蓝的光催化活性，发现金属的吸收量从纯二氧化钛的10 mg / g增加到V掺杂的二氧化钛的17 mg / g。在紫外光下暴露24 h产生了吸附等温线，用于从水溶液中去除铅和锌，结果表明，二氧化钛掺杂钒时，光催化活性得到增强。