El-Moselhy Medhat Mohamed
Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt.
J Hazard Mater. 2009 Sep 30;169(1-3):498-508. doi: 10.1016/j.jhazmat.2009.03.120. Epub 2009 Apr 2.
Al and Fe modified silicates were synthesized using the hydrothermal method. The obtained materials were calcined at different temperatures (250, 500 and 750 degrees C) and characterized using XRD, FTIR, UV and SEM spectroscopy. The obtained materials were applied for the photo-decolorization of acid red 44 as a member of azo dye family, in aqueous medium using UV irradiation (lambda=254 nm) under different experimental conditions. The effect of calcination temperature, catalyst concentration and pH on the decolorization of acid red 44 dye were investigated. The decolorization of acid red 44 dye and the decreasing in concentration of the formed intermediates have been followed using UV-vis spectrophotometry and high performance liquid chromatography (HPLC). Results showed that the addition of Al and Fe-silicate to the dye solution as well as pH change greatly enhanced the rate of degradation. The decolorization followed the pseudo first order kinetics model and a significant mineralization of AR44 was observed.
采用水热法合成了铝和铁改性的硅酸盐。将所得材料在不同温度（250、500和750℃）下煅烧，并使用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、紫外光谱（UV）和扫描电子显微镜（SEM）光谱进行表征。在不同实验条件下，使用紫外线照射（波长λ=254nm），将所得材料用于酸性红44（作为偶氮染料家族的一员）在水介质中的光脱色。研究了煅烧温度、催化剂浓度和pH值对酸性红44染料脱色的影响。使用紫外可见分光光度法和高效液相色谱法（HPLC）跟踪酸性红44染料的脱色以及所形成中间体浓度的降低情况。结果表明，向染料溶液中添加铝和铁硅酸盐以及改变pH值极大地提高了降解速率。脱色遵循准一级动力学模型，并且观察到AR44有显著的矿化作用。
