Photocatalytic decomposition of shale gas flowback water producing hydrogen by S-scheme heterojunction NiTiO3/CdS
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摘要: 本研究通过简单水热法制备出具有S型异质结构的NiTiO3/CdS光催化材料。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、比表面积分析及紫外-可见漫反射光谱（UV-vis DRS）等手段对光催化剂进行表征，并通过光催化页岩气返排废水产氢实验测试其产氢性能。结果表明，NiTiO3和CdS两者成功复合，15% NiTiO3/CdS表现出最强的产氢性能（1568.9 µmol/(g·h)）和优异的循环利用潜力。本研究对开发高效稳定的S型异质结光催化剂、废水的多效利用及缓解能源短缺具有重要意义。Abstract: Constructing S-scheme heterojunction is an effective strategy to form photocatalytic materials with strong reduction property and improve photocatalytic performance. In this paper, NiTiO3/CdS photocatalytic materials with S-scheme heterostructures were prepared by a simple hydrothermal method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), specific surface area analysis and Ultraviolet-visible diffuse reflection spectroscopy (UV-vis DRS). The hydrogen production performance was tested by the photocatalytic hydrogen production experiment from shale gas flowback water. The results showed that NiTiO3 and CdS were successfully compounded. In addition, 15% NiTiO3/CdS showed the optimum hydrogen production performance (1568.9 µmol/(g·h)), and excellent recycling potential. This work is of great significance for the exploration of efficient and stable photocatalysts with S-scheme heterojunctions, the efficient utilization of wastewater and the alleviation of energy shortages.
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图 1 NTO/CS光催化剂产氢性能
Figure 1 Hydrogen production performance of NTO/CS(a): H2 production yield; (b): rate constant.
图 3 样品的SEM图、晶粒尺寸分布图及NTO/CS-15的TEM、HRTEM图片
Figure 3 SEM for (a) NTO, (b) CS and (c) NTO/CS-15, (d) grain size distribution images of samples, (e) TEM and (f) HRTEM images of NTO/CS-15
图 4 NTO、CS和NTO/CS-15的XPS能谱图
Figure 4 XPS spectra for NTO, CS and NTO/CS-15
(a): full spectrum; (b): Ni 2p; (c): Ti 2p; (d): O 1s; (e): Cd 3d; (f): S 2p.
图 5 样品氮气吸附-脱附曲线（内含孔径分布）
Figure 5 N2 adsorption-desorption isotherms and pore size distribution curves (inset) for CS and NTO/CS-15
图 6 NTO、CS和NTO/CS-15的光学性能测试
Figure 6 (a) UV-DRS and (b) band gap energy for NTO, CS and NTO/CS-15
图 8 NTO/CS-15的循环实验产氢曲线及循环前后的XRD谱图
Figure 8 (a) Stability test and (b) XRD patterns before and after 5 recycles for NTO/CS-15
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