Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2010 Sep;45(11):1413-20. doi: 10.1080/10934529.2010.500934.
Nanoparticles of zinc oxide semiconductor were applied for removal of toxic organic pollutants such as dyes (alizarin yellow GG) from wastewater using laser induced photocatalytic process. A special photoreactor was designed for this purpose using local resources. Laser enhanced photo degradation of alizarin yellow GG (AYGG) was carried out by irradiating the contaminated aqueous solution with a 355 nm radiation generated from third harmonic of Nd:YAG laser. The effect of different operational parameters such as the initial dyes concentration, the concentration of photocatalyst, laser irradiation time, laser energy and pH on photocatalytic degradation of the dyes was investigated. It was observed that pH and the initial dyes concentration has a significant role in the dyes removal process. Using the optimum conditions (parameters), almost 90% degradation was achieved by nano ZnO in a short span of time. The efficiency achieved in this work using nano ZnO was much higher than micro ZnO catalyst and using conventional custom made setups. This is a first study of its kind where laser and nano ZnO particles have been employed for removal of dyes from wastewater.
氧化锌半导体纳米粒子被应用于激光诱导光催化过程，以去除废水中的有毒有机污染物，如染料（茜素黄 GG）。为此，利用当地资源设计了一种特殊的光反应器。通过用 Nd:YAG 激光的三次谐波产生的 355nm 辐射照射受污染的水溶液，进行激光增强的茜素黄 GG（AYGG）光降解。考察了不同操作参数对染料光催化降解的影响，如初始染料浓度、光催化剂浓度、激光辐照时间、激光能量和 pH 值。结果表明，pH 值和初始染料浓度对染料去除过程有显著影响。在最佳条件（参数）下，纳米 ZnO 在短时间内几乎达到 90%的降解。本工作中使用纳米 ZnO 获得的效率远高于使用微 ZnO 催化剂和传统定制装置的效率。这是首次利用激光和纳米 ZnO 颗粒从废水中去除染料的研究。
