CdS QDs-Decorated Self-Doped γ-Bi2MoO6: A Sustainable and Versatile Photocatalyst toward Photoreduction of Cr(VI) and Degradation of Phenol
CdS QDs-Decorated Self-Doped γ-Bi2MoO6: A Sustainable and Versatile Photocatalyst toward Photoreduction of Cr(VI) and Degradation of Phenol
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DOI：
10.1021/acsomega.7b01250
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发表时间：
2017-12-01
期刊：
影响因子：
4.1
通讯作者：
Parida, K. M.
中科院分区：
文献类型：
--
作者：
Kandi, Debasmita;Martha, Satyabadi;Parida, K. M.
本文以葡萄糖为还原剂，采用水热法制备了CdS量子点敏化自掺杂Bi2MoO6，并进行了原位沉积。合成的催化剂用于还原有毒的Cr（VI）和降解水溶液中的苯酚。使用x射线衍射、紫外-可见漫反射、光致发光（PL）、扫描电子显微镜、透射电子显微镜（TEM）、傅里叶变换红外光谱和电化学阻抗谱进行了结构、光学和电化学表征。通过计算乌尔巴赫能、PL和光致发光激发光谱，精确地研究了其光学性质。量子点的有序分布通过PL谱半最大值全宽度、厄巴赫能和TEM分析的相关性得到证实。测试了该材料对Cr（VI）还原和苯酚降解的多用途光催化活性。3% CdS qds敏化的自掺杂Bi2MoO6在日光下对Cr（VI）的还原和苯酚的降解活性最高，分别为97%和47.5%。动力学和pH（PZC）值的测定支持了催化剂对Cr（VI）的还原。此外，光稳定性和可重复使用性测试表明，该催化剂可重复使用5次而不降低其活性。
In this work, CdS quantum dots (QDs)-sensitized self-doped Bi2MoO6 has been synthesized using glucose as reducing agent by hydrothermal method, followed by in situ deposition of the QDs. The synthesized catalyst has been employed to reduce toxic Cr(VI) and degrade phenol from the aqueous solution. The structural, optical, and electrochemical characterizations are performed using X-ray diffraction, UV-vis diffuse reflection, photoluminescence (PL), scanning electron microscopy, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy, and electrochemical impedance spectroscopy. The optical properties were precisely investigated by calculating the Urbach energy, PL, and photoluminescence excitation spectra. The orderly distribution of QDs is confirmed from the correlation between full width at half-maximum of PL spectra, Urbach energy, and TEM analysis. The versatile photocatalytic activity has been tested toward Cr(VI) reduction and degradation of phenol. 3% CdS QDs-sensitized self-doped Bi2MoO6 showed highest activity, i.e., 97 and 47.5% toward reduction of Cr(VI) and degradation of phenol under solar light. The reduction of Cr(VI) by the catalyst is supported by the kinetics and determination of the pH(PZC) value. In addition to this, the photostability and reusability test showed that the catalyst can be reused up to five cycles without diminishing its activity.