Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance
Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance
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具有增强光催化性能的生长工艺和 CQD 修饰的 Bi4Ti3O12 方形板
DOI：
10.3390/mi10010066
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发表时间：
2019-01
期刊：
影响因子：
3.4
通讯作者：
Yi Zao
中科院分区：
文献类型：
--
作者：
Zhao Xinxin;Yang Hua;Cui Ziming;Wang Xiangxian;Yi Zao
通过水热法合成了Bi4Ti3O12方形板，并系统研究了其生长过程。以葡萄糖为碳源制备碳量子点（CQD），然后通过水热途径将其组装在 Bi4Ti3O12 方形板的表面上，以提高光催化性能。使用 XRD（X 射线粉末衍射）、SEM（扫描电子显微镜）、TEM（透射电子显微镜）、UV-vis DRS（漫反射光谱）、XPS（X 射线光电子能谱）、FTIR（傅里叶变换红外光谱）、PL（光致发光）光谱、EIS（电化学阻抗谱）和光电流光谱来系统地表征所制备的样品。结果表明，Bi4Ti3O12 板上的 CQD 装饰会导致可见光吸收增加、带隙略有增加、光电流密度增加、电荷转移电阻降低和 PL 强度降低。分别采用模拟太阳光和可见光作为光源，评价样品对水溶液中RhB降解的光催化活性。在模拟太阳光和可见光照射下，适量CQDs的CQDs@Bi4Ti3O12复合材料表现出明显增强的光催化性能。然而，过多的CQDs的装饰会导致光催化活性下降。 CQDs修饰的Bi4Ti3O12光催化活性增强可归因于以下原因：（1）Bi4Ti3O12和CQDs之间的电子转移促进了Bi4Ti3O12中光生电子/空穴对的有效分离； (2) CQD 发出的上转换光致发光可以诱导 Bi4Ti3O12 中额外电子/空穴对的产生； (3)CQD中的光激发电子可以参与光催化反应。
Bi4Ti3O12 square plates were synthesized via a hydrothermal route, and their growth process was systematically investigated. Carbon quantum dots (CQDs) were prepared using glucose as the carbon source, which were then assembled on the surface of Bi4Ti3O12 square plates via a hydrothermal route with the aim of enhancing the photocatalytic performance. XRD (X-ray powder diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), UV-vis DRS (diffuse reflectance spectroscopy), XPS (X-ray photoelectron spectroscopy), FTIR (Fourier transform infrared spectroscopy), PL (photoluminescence) spectroscopy, EIS (electrochemical impedance spectroscopy) and photocurrent spectroscopy were used to systematically characterize the as-prepared samples. It is demonstrated that the decoration of CQDs on Bi4Ti3O12 plates leads to an increased visible light absorption, slightly increased bandgap, increased photocurrent density, decreased charge-transfer resistance, and decreased PL intensity. Simulated sunlight and visible light were separately used as a light source to evaluate the photocatalytic activity of the samples toward the degradation of RhB in aqueous solution. Under both simulated sunlight and visible light irradiation, CQDs@Bi4Ti3O12 composites with an appropriate amount of CQDs exhibit obviously enhanced photocatalytic performance. However, the decoration of excessive CQDs gives rise to a decrease in the photocatalytic activity. The enhanced photocatalytic activity of CQDs-modified Bi4Ti3O12 can be attributed to the following reasons: (1) The electron transfer between Bi4Ti3O12 and CQDs promotes an efficient separation of photogenerated electron/hole pairs in Bi4Ti3O12; (2) the up-conversion photoluminescence emitted from CQDs could induce the generation of additional electron/hole pairs in Bi4Ti3O12; and (3) the photoexcited electrons in CQDs could participate in the photocatalytic reactions.
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影响因子：
4.1
作者：
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影响因子：
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DOI：
10.1590/1980-5373-mr-2018-0118
发表时间：
2018-07
期刊：
Materials Research
影响因子：
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通讯作者：
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