Singh H K, Saquib M, Haque M M, Muneer M
Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India.
J Hazard Mater. 2007 Apr 2;142(1-2):425-30. doi: 10.1016/j.jhazmat.2006.08.038. Epub 2006 Aug 22.
Photocatalyzed degradation of uracil (1) and 5-bromouracil (2) has been investigated in aqueous suspensions of titanium dioxide under a variety of conditions. The degradation was studied by monitoring the change in substrate concentration employing UV spectroscopic analysis technique and depletion in total organic carbon (TOC) content as a function of irradiation time. The degradation of the compounds under investigation was studied using various parameters such as, different types of TiO2 powders, pH, catalyst concentration, substrate concentrations, and in the presence of electron acceptors like hydrogen peroxide (H(2)O(2)) and potassium bromate (KBrO(3)) besides molecular oxygen. Photocatalyst Degussa P25 was found to be more efficient for the degradation of both compounds as compared with other TiO2 powders such as UV100, PC500 and TTP.
在多种条件下，对二氧化钛水悬浮液中尿嘧啶（1）和5-溴尿嘧啶（2）的光催化降解进行了研究。通过使用紫外光谱分析技术监测底物浓度的变化以及作为辐照时间函数的总有机碳（TOC）含量的减少来研究降解情况。使用各种参数研究了所研究化合物的降解，例如不同类型的TiO₂粉末、pH值、催化剂浓度、底物浓度，以及除分子氧外还存在诸如过氧化氢（H₂O₂）和溴酸钾（KBrO₃）等电子受体的情况。与其他TiO₂粉末如UV100、PC500和TTP相比，发现光催化剂德固赛P25对这两种化合物的降解更有效。
