Nano-Ag particles doped TiO2 for efficient photodegradation of Direct azo dyes
Nano-Ag particles doped TiO2 for efficient photodegradation of Direct azo dyes
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DOI：
10.1016/j.molcata.2006.05.013
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发表时间：
2006-10
影响因子：
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通讯作者：
N. Sobana;M. Muruganadham;M. Swaminathan
中科院分区：
文献类型：
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作者：
N. Sobana;M. Muruganadham;M. Swaminathan
采用BET比表面积、扫描电子显微镜、X射线衍射仪、能谱分析、电子自旋共振、漫反射光谱等表面分析方法对纳米银掺杂二氧化钛进行了表征。为了评价银沉积对TiO2光催化活性的影响，我们研究了直接红23(DR 23)和直接蓝53(DB 53)两种直接重氮染料在纳米二氧化钛和银沉积纳米粒子悬浮液中的光催化降解。发现二氧化钛中银的存在增强了DR23和DB53的光降解。银掺杂二氧化钛的高活性是由于银颗粒的电子陷阱增强了电子-空穴的分离。
Silver nanoparticles doped TiO2has been prepared and characterised by surface analytical methods such as BET surface area, scanning electron micrographs (SEM), X-ray diffraction (XRD), energy dispersive X-ray micro analysis (EDX), electron spin resonance (ESR) and diffuse reflectance spectroscopy (DRS). We have investigated the photocatalytic degradation of two Direct diazo dyes, Direct red 23 (DR 23) and Direct blue 53 (DB 53) in the aqueous suspensions of TiO2and Ag deposited TiO2nanoparticles under UV-A light irradiation in order to evaluate the various effects of silver deposition on the photocatalytic activity of TiO2. The presence of silver in TiO2was found to enhance the photodegradation of DR 23 and DB 53. The higher activity of silver doped TiO2is due to the enhancement of electron–hole separation by the electron trapping of silver particles.