引用本文:
周硕林, 徐琼, 肖家福, 钟文周, 喻宁亚, 尹笃林. 甲苯-2,4-二氨基甲酸甲酯的光降解考察金红石TiO2颜料紫外屏蔽特性[J]. 应用化学,
2015, 32(6): 683-688.
doi:
10.11944/j.issn.1000-0518.2015.06.140349
Citation: ZHOU Shuolin, XU Qiong, XIAO Jiafu, ZHONG Wenzhou, YU Ningya, YIN Dulin. Investigation of UV-Shielding Properties of Rutile Titanium Dioxide Pigments via Photodegradation of Dimethyl Toluene-2, 4-dicarbamate[J]. Chinese Journal of Applied Chemistry, 2015, 32(6): 683-688. doi: 10.11944/j.issn.1000-0518.2015.06.140349
Citation: ZHOU Shuolin, XU Qiong, XIAO Jiafu, ZHONG Wenzhou, YU Ningya, YIN Dulin. Investigation of UV-Shielding Properties of Rutile Titanium Dioxide Pigments via Photodegradation of Dimethyl Toluene-2, 4-dicarbamate[J]. Chinese Journal of Applied Chemistry, 2015, 32(6): 683-688. doi: 10.11944/j.issn.1000-0518.2015.06.140349
甲苯-2,4-二氨基甲酸甲酯的光降解考察金红石TiO2颜料紫外屏蔽特性
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。
English
Investigation of UV-Shielding Properties of Rutile Titanium Dioxide Pigments via Photodegradation of Dimethyl Toluene-2, 4-dicarbamate
Abstract:
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 UVshielding properties of TiO2 particles as it has advantages like mild reaction conditions,simple operation and excellent reproducibility.
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Key words:
- rutile titanium dioxide
- / pigment
- / dimethyl toluene-dicarbamate
- / UV-shielding
- / kinetics
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