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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Comparative Photocatalytic Ability of Nanocrystal-Carbon Nanotube and -TiO2 Nanocrystal Hybrid Nanostructures
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Comparative Photocatalytic Ability of Nanocrystal-Carbon Nanotube and -TiO2 Nanocrystal Hybrid Nanostructures

机译:纳米晶-碳纳米管和-TiO2纳米晶混杂纳米结构的比较光催化能力。

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摘要

We synthesized various nanocrystal (e.g., CdS, CdSe, and Cu2S)-carbon nanotube (NC-CNT) and NC-TiO2 hybrid nanostructures using the solvothermal method and compared their photocatalytic ability toward the visible-light-driven degradation of methylene blue (MB) dye. The free CdS NCs exhibited higher degradation efficiency than the CdSe and Cu2S NCs. The photocatalytic abilities of the NCs were found to determine the relative degradation efficiency of their CNT and TiO2 hybrid nanostructures. These results suggest that the oxidative N-demethylation degradation involves the transfer of holes from the NCs to MB. The hybridization of the NCs with the TiO2 NCs and CNTs enhances the oxidative degradation rate to the same extent, suggesting that the interfacial electron transfer process from the NCs to the attached CNTs (or TiO2), which retards the recombination of the electrons and holes, is comparable for both hybrid nanostructures.
机译:我们使用溶剂热法合成了各种纳米晶体(例如CdS,CdSe和Cu2S)-碳纳米管(NC-CNT)和NC-TiO2杂化纳米结构,并比较了它们对可见光驱动的亚甲基蓝(MB)的光催化能力。 )染料。游离CdS NCs的降解效率高于CdSe和Cu2S NCs。发现NCs的光催化能力决定了其CNT和TiO2杂化纳米结构的相对降解效率。这些结果表明,氧化性N-脱甲基化降解涉及空穴从NC转移到MB。 NCs与TiO2 NCs和CNT的杂化在相同程度上提高了氧化降解速率,表明从NCs到附着的CNT(或TiO2)的界面电子转移过程阻碍了电子与空穴的重新结合,对于两种杂化纳米结构而言是可比的。

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