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Decomposition of dimethyl methylphosphonate vapor on ultrathin-film titania photocatalytic light absorber
Chemosphere ( IF 8.8 ) Pub Date : 2021-01-23 , DOI: 10.1016/j.chemosphere.2021.129719
Wei Wu , Haomin Song , Qiaoqiang Gan , Dongxia Liu

The decomposition of chemical warfare agent simulant, dimethyl methylphophonate (DMMP) vapor, was investigated on an ultrathin film titania (TiO2) photocatalytic light absorber. The light absorber contains an aluminum (Al) reflector and the TiO2 thin film with different thicknesses, sequentially deposited on a supportive glass substrate. The designed structure constructs a nanocavity that exhibits strong light absorption within the photocatalytic TiO2 ultrathin film. Thus, the intrinsic trade-off between optical absorption and charge carrier extraction efficiency, i.e., a light absorber should be thick enough to absorb the light allowable by its band gap but thin enough to allow charge carrier extraction for catalytic reactions, is conquered. The TiO2/Al light absorber significantly boosted TiO2 photocatalytic activity compared to the benchmark Aeroxide®P25 catalyst (i.e., up to 2013 times increase in reaction rate). The effects of reactant (i.e. DMMP, water and oxygen, respectively) partial pressure and reaction temperature on photocatalytic decomposition of DMMP by the ultrathin-film TiO2 photocatalytic light absorber were studied. Kinetic data of the DMMP decomposition can be described by the Langmuir-Hinshelwood model.



中文翻译:

超薄膜二氧化钛光催化光吸收剂上甲基膦酸二甲酯蒸气的分解

在超薄膜二氧化钛(TiO 2)光催化光吸收剂上研究了化学战剂模拟物甲基膦酸二甲酯(DMMP)蒸气的分解。所述光吸收剂包含依次沉积在支撑玻璃基板上的铝(Al)反射器和具有不同厚度的TiO 2薄膜。设计的结构构造了一个纳米腔,该腔在光催化TiO 2超薄薄膜中显示出强大的光吸收能力。因此,克服了光吸收和电荷载流子提取效率之间的固有折衷,即,光吸收剂应足够厚以吸收其带隙所允许的光,但应足够薄以允许电荷载流子提取以进行催化反应。二氧化钛与基准Aeroxide®P25催化剂相比,2 / Al吸光剂显着提高了TiO 2的光催化活性(即,反应速率提高了2013倍)。研究了反应物(分别为DMMP,水和氧气)的分压和反应温度对超薄TiO 2光催化光吸收剂对DMMP光催化降解的影响。DMMP分解的动力学数据可以用Langmuir-Hinshelwood模型描述。

更新日期:2021-02-01
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