超薄钼酸铋纳米片光催化甲苯选择性氧化
首发时间:2018-06-05
摘要:以氧化钼纳米棒为前驱体,通过简单的水热、醇热法可控合成了具有不同厚度的钼酸铋纳米片,其中以醇热法可以制备超薄钼酸铋纳米片(约6 nm)。可见光照射下,以氧气为氧化剂,三氟甲苯为溶剂,可以高选择性(选择性大于96%)氧化甲苯制备苯甲醛。钼酸铋纳米片的光催化活性与其片的厚度相关,厚度越薄,光催化活性越高。通过自由基捕获实验探究光催化反应机理,发现空穴是该催化过程中最主要的活性物种。空穴与催化剂表面吸附的甲苯反应生成苄基自由基是该反应的控速步骤,随后生成的苄基自由基与氧气反应生成过氧苯甲基中间体,中间体最终脱水生成目标产物苯甲醛
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Ultrathin Bi2MoO6 nanosheets for photocatalytic oxidation of toluene
Abstract:Bismuth molybdate nanosheets different in thickness were facilely prepared and tested as photocatalysts for selective oxidation of toluene to benzaldehyde in the presence of oxygen and under visible light irradiation. It was found that the photocatalytic activity is closely related to the thickness of bismuth molybdate nanosheets. Apparently, thinner nanosheets could induce higher photocatalytic activity. Among them, the ultrathin bismuth molybdate nanosheets (about 6 nm in thickness) which were prepared by a simple solvothermal method using molybdenum oxide rods as precursor and ethylene glycol as solvent showed the highest activity. The excellent activity is ascribed to the ultrathin sheet-like structure that facilitates efficient separation and transfer of charge carriers. Holes was found to be the main active species. The active species were investigated by addding trapping agents and holes were main active species, which interact with toluene molecules on bismuth molybdate surface, and there is immediate formation of benzyl radicals. Then the benzyl radicals react with oxygen both on the surface of catalyst or in the reaction solution to produce benzaldehyde.
Keywords: industral catalysis photocatalysis selective oxidation toluene
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