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首页> 外文期刊>Separation and Purification Technology >Preparation and characterization of Pt-N/TiO2 photocatalysts and their efficiency in degradation of recalcitrant chemicals
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Preparation and characterization of Pt-N/TiO2 photocatalysts and their efficiency in degradation of recalcitrant chemicals

机译：Pt-N / TiO2光催化剂的制备，表征及其降解难降解化学物质的效率

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Series of Pt-N/TiO2 photocatalysts were synthesized using the sol-gel method. The photocatalysts' characteristics by X-ray diffractometry (XRD), scanning transmission electron microscopy (STEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) showed that sample with the molar ratio Ti:N equal 1:4 and platinum nanoparticles size of about 3 nm had anatase structure, about 94 m(2)/g specific surface area and nitrogen content about 0.7 at.%. The photocatalytic activity was estimated by measuring the decomposition rate of phenol in 0.2 mM aqueous solution under Vis and UV/Vis light irradiation. Compared to N-TiO2 and Pt-TiO2 samples, the photocatalytic activity was improved markedly for samples Pt-N/TiO2 regarding the observed synergistic effect of nitrogen and platinum. The formation of hydroxyl radicals ((OH)-O-center dot) on the surface of Pt-N/TiO2 nanocomposites was detected by the luminescence technique using terephthalic acid as probe molecules. Regarding flow back fluid treatment after shale gas exploration, the progress of photocatalytic degradation of organic compounds was measured by the total organic carbon (TOC) concentration. (C) 2015 Published by Elsevier B.V.
机译：采用溶胶-凝胶法合成了一系列的Pt-N / TiO2光催化剂。通过X射线衍射法（XRD），扫描透射电子显微镜（STEM），漫反射光谱法（DRS），X射线光电子光谱法（XPS）表征光催化剂，结果表明摩尔比为Ti：N等于1：4的样品铂纳米颗粒的大小约为3 nm，具有锐钛矿结构，比表面积约为94 m（2）/ g，氮含量约为0.7 at。％。通过在Vis和UV / Vis光照射下测量0.2mM水溶液中苯酚的分解速率来估计光催化活性。与N-TiO2和Pt-TiO2样品相比，考虑到氮和铂的协同作用，Pt-N / TiO2样品的光催化活性显着提高。以对苯二甲酸为探针分子，通过发光技术检测了Pt-N / TiO2纳米复合材料表面羟基自由基（（OH）-O-中心点）的形成。关于页岩气勘探后的返排液处理，通过总有机碳（TOC）浓度来测量有机化合物的光催化降解进程。 （C）2015由Elsevier B.V.发布

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