甲苯-2,4-二氨基甲酸甲酯的光降解考察金红石TiO_2颜料紫外屏蔽特性  

Investigation of UV-Shielding Properties of Rutile Titanium Dioxide Pigments via Photodegradation of Dimethyl Toluene-2,4-dicarbamate

作　　者：周硕林[1] 徐琼[1] 肖家福 钟文周[1] 喻宁亚[1] 尹笃林[1] 

机构地区：[1]湖南师范大学化学化工学院、石化新材料与资源精细利用国家地方联合工程实验室,长沙410081

出　　处：《应用化学》2015年第6期683-688,共6页Chinese Journal of Applied Chemistry

基　　金：国家地方联合创新平台资助项目(No.20123098);国家自然科学基金(Nos.21003043,20976043)~~

摘　　要：以甲苯-2,4-二氨基甲酸甲酯(2,4-TDC)为分子探针模型,构建了一种新的评价金红石二氧化钛颜料紫外屏蔽性能的反应体系,系统地考察了反应条件对分子探针光降解的影响,并对一系列二氧化钛颜料紫外屏蔽性能进行了对比研究。结果表明,金红石二氧化钛作用下,2,4-TDC光降解过程符合一级反应动力学;随着二氧化钛颜料用量的增加,2,4-TDC光降解速率常数呈现指数次下降趋势;紫外光照下表面包覆的金红石二氧化钛颜料不能完全抑制·OH和h+活性物种的产生。根据2,4-TDC的光降解速率常数,能体现一系列工业金红石二氧化钛颜料紫外屏蔽性能差异。该方法具有条件温和、操作简便、实验周期短、结果重现性好等优点,将在二氧化钛颜料的紫外屏蔽性能测试中具有潜在的应用价值。Dimethyl toluene-2,4-dicarbamate（2,4-TDC） was selected as a model molecule to investigate the UV-shielding properties of TiO2 pigments. The results show that the degradation of 2,4-TDC follows the firstorder kinetics at different volume ratios of tetrahydrofuran to n-hexane. The decrease of the degradation kinetics constant of 2,4-TDC shows an exponential power tendency with the increase of the amount of TiO2. Moreover, it is found that the reactive species such as . OH and holes still play a minor role on the photodegradation of 2,4-TDC in presence of TiO2 pigments. Based on the degradation kinetics constant of 2,4- TDC, the UV-shielding properties of different TiO2 pigments can be directly evaluated within four hours. This study might have potential applications in industrial production and practical use for evaluating the UV- shielding properties of TiO2 particles as it has advantages like mild reaction conditions, simple operation and excellent reproducibility.

关 键 词：金红石TiO2 颜料 甲苯二氨基甲酸甲酯 紫外屏蔽 动力学 

分 类 号：O612.4[理学—无机化学]