Construction of Z-scheme tungsten trioxide nanosheets-nitrogen-doped carbon dots composites for the enhanced photothermal synergistic catalytic oxidation of cyclohexane

Construction of Z-scheme tungsten trioxide nanosheets-nitrogen-doped carbon dots composites for the enhanced photothermal synergistic catalytic oxidation of cyclohexane
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Z型三氧化钨纳米片-氮掺杂碳点复合材料的构建用于增强环己烷光热协同催化氧化

DOI:
10.1016/j.apcatb.2019.118063
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发表时间:
2019-12
期刊:
Applied Catalysis B: Environmental
影响因子:
--
通讯作者:
Fang Yanxiong
Fang Yanxiong
中科院分区:
其他
文献类型:
--
作者:
Zhang Jinhong;Liu Jincheng;Wang Xiaoyu;Mai Jijin;Zhao Wei;Ding Zhongxiang;Fang Yanxiong

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通过在wo3纳米片表面组装具有不同末端胺基和羧酸基的碳点,制备了新型Z-scheme wo3纳米片-碳点复合材料。进一步比较了它们的微形貌、结构组成、光学和电化学性能。wo3 - n掺杂碳点(NCDs)复合材料具有较低的荧光强度和界面电阻,表明了两种半导体之间有效的电子转移。WO3-NCDs复合材料光热催化环己烷氧化活性显著提高,对KA油的转化率为7.88%,选择性为98.9%。该性能是wo3 -碳点与羧基(ccd)复合材料的1.2倍,是纯wo3纳米片的1.5倍。NCDs与WO3之间有效的Z-scheme电荷转移和光热协同催化加速了环己烷氧化链的引发导致了催化性能的显著提高。
The novel Z-scheme WO3nanosheets-carbon dots (CDs) composites were prepared by assembling carbon dots with different terminal groups of amine groups and carboxylic acid groups on the surface of WO3nanosheets. Their microtopography, structural composition, optical and electrochemical properties are further compared. The lower fluorescence intensity and interfacial resistance of WO3-N-doped carbon dots (NCDs) composites indicate the efficient electron transfer between the two semiconductors. The WO3-NCDs composites show the significantly improved photothermal catalysis activity of cyclohexane oxidation with the highest conversion of 7.88% and selectivity to KA oil of 98.9%. This performance is 1.2 times that of WO3-carbon dots with the carboxyl groups (CCDs) composites and 1.5 times that of pure WO3nanosheets. The significantly increased catalytic performance was caused by the effective Z-scheme charge transfer between NCDs and WO3, and the accelerated chain initiation of cyclohexane oxidation by the photothermal synergistic catalysis.
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