Constructing novel ternary composites of carbon quantum dots/Bi2MoO6/graphitic nanofibers with tunable band structure and boosted photocatalytic activity
Constructing novel ternary composites of carbon quantum dots/Bi2MoO6/graphitic nanofibers with tunable band structure and boosted photocatalytic activity
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构建具有可调能带结构和增强光催化活性的碳量子点/Bi2MoO6/石墨纳米纤维的新型三元复合材料
DOI：
10.1016/j.seppur.2019.02.024
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发表时间：
2019-06
影响因子：
8.6
通讯作者：
Li Dan
中科院分区：
文献类型：
--
作者：
Huang Weiya;Wang Shuhong;Zhou Qin;Liu Xin;Chen Xirong;Yang Kai;Yu Changlin;Li Dan
采用水热法制备了新型三元碳量子点(CDs)/Bi2MoO6(BMO)/石墨碳纳米纤维（GNFs）复合材料（CDs/BMO/GNFs），并对其作为光催化剂进行了研究。对所制备的光催化剂的形态、结构和理化性质进行了详细的考察；cd修饰的BMO粒子锚定在修饰的GNFs表面形成异质结。与相应的二元复合材料（BMO/GNFs和CDs/BMO）和纯BMO相比，CDs/BMO/GNFs在降解罗丹明B （RhB）、亚甲基蓝（MB）和苯酚三种不同的有机物以及还原重金属离子Cr（VI）方面的光催化活性均优于BMO/GNFs和CDs/BMO。我们的研究表明，cd /BMO/GNFs三元复合材料的光催化性能受到cd或/和GNFs在BMO中的负载的显著影响。其中，优化后的样品C5/BMO/GNF-0.2在Bi/C摩尔比为0.2和添加5 mL CDs的条件下，光催化降解RhB的活性最好。经模拟太阳光照射70 min后，发现99.4%的RhB被去除。这归因于组件（CDs， BMO和GNFs）和异质结之间的协同效应，导致光电子和空穴的有效空间分离。提出C5/BMO/GNF-0.2的光催化机理可能是光生空穴、自由基dotO2−和自由基dotOH参与了光催化，自由基猝灭实验和电子自旋共振分析支持了这一理论。
Novel ternary carbon quantum dots (CDs)/Bi2MoO6(BMO)/graphitic carbon nanofibers (GNFs) composites (CDs/BMO/GNFs) were prepared by a facile hydrothermal method and studied for use as photocatalysts. The morphological, structural and physicochemical properties of the as-prepared photocatalysts were examined in detail; that the CDs-decorated BMO particles anchored on the surfaces of modified GNFs to form heterojunctions. The photocatalytic activity of the resultant CDs/BMO/GNFs was superior for the degradation of three different organics, including Rhodamine B (RhB), methylene blue (MB) and phenol, as well as the reduction of a heavy metal ion Cr(VI), when compared with the corresponding binary composites (BMO/GNFs and CDs/BMO) and pure BMO. Our study revealed that the photocatalytic performance of ternary composite CDs/BMO/GNFs was significantly affected by the loadings of CDs or/and GNFs in BMO. Especially, the optimized sample C5/BMO/GNF-0.2, which was synthesized with a Bi/C molar ratio of 0.2 and the addition of 5 mL CDs, exhibited the best activity in the photocatalytic degradation of RhB. It was found that 99.4% of RhB was removed after 70-min exposure to the simulated solar light irradiation. This was attributed to the synergistic effects between components (CDs, BMO and GNFs) and heterojunctions, resulting in an efficient spatial separation of the photogenerated electrons and holes. A possible photocatalytic mechanism of C5/BMO/GNF-0.2 was proposed that the photogenerated holes,radical dotO2−andradical dotOH radicals contributed to the photocatalysis, which was supported by the radical quenching experiment and electron spin resonance analysis.
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