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以三聚氰胺为前驱物采用热聚合法制备了石墨相氮化碳(g-C3N4),并在其表面原位合成了碘氧化铋(BiOI),构筑了石墨相氮化碳-碘氧化铋复合材料。采用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)、紫外可见漫反射仪(UV-Vis-DRS)等对催化剂进行了表征。结果表明,当BiOI与g-C3N4物质的量比为0.5时,BiOI/g-C3N4催化剂具有高分散的BiOI颗粒及适中的禁带宽度,吸附和降解甲基橙性能最佳。回流温度为120 ℃时制备的BiOI/g-C3N4催化剂具有适中的粒径、比表面积和表面羟基浓度,吸附和降解甲基橙性能最佳,且该催化剂具有良好的重复使用性能。 相似文献
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Shuyang Yao Ruifen Zheng Rong Li Yiqi Chen Xiaosong Zhou Xiaomei Ning Liang Zhan Jin Luo 《Journal of the American Ceramic Society》2020,103(3):1709-1721
Exploring noble-metal-free co-catalysts highly flexible for separating the photogenerated charge carriers is of prime importance for the visible-light-driven photocatalysis. Herein, three-dimensional flower-like BiOI microspheres were fabricated and applied to support noble-metal-free LaCoO3 co-catalysts to construct a unique LaCoO3/BiOI hybrid photocatalyst with a higher ability in charge separation. As expected, the optimum tetracycline degradation rate of LaCoO3 (4.0 wt%)/BiOI was up to 0.0161 min−1, which was nearly 3.4 fold larger than that of pure BiOI (0.0048 min−1). The enhanced photocatalytic performance was mainly ascribed to the vital role of LaCoO3 co-catalyst, which acted as an excellent electron collector for capturing the electrons generated by BiOI, effectively promoting the separation of photogenerated charge carriers and prolonging the lifetime of photo-induced electron-hole pairs at the same time. Furthermore, the active species trapping experiments revealed that the excellent photocatalytic activity was primarily driven by photogenerated holes and superoxide radicals. This work is expected to provide a new inspiration for rationally designing and fabricating noble-metal-free co-catalyst system with high efficiency applied in environment purification. 相似文献
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《International Journal of Hydrogen Energy》2019,44(39):21865-21872
ZnO/CdS photoanode with an excellent photoelectrochemical (PEC) performance for water splitting to produce hydrogen, but its practical application is seriously hindered owing to the photocorrosion induced by photoholes on the surface of CdS. Herein, a 3D cross-linked heterostructure ZnO/CdS/BiOI nanorod arrays (NRAs) has been prepared by a simple solvothermal strategy. Under visible light illumination (λ > 420 nm), the ZnO/CdS/BiOI NRAs photoanode shows an excellent PEC activity and generates a photocurrent density of 9.12 mA cm−2 at 1.1 V vs. RHE, which is 1.8 times higher than that of the ZnO/CdS NRAs photoanode in the alkaline electrolyte. Furthermore, the photoanode achieves a high photo conversion efficiency of 3.49% and a long-time stability over 6000 s. It is proposed that the BiOI nanosheets not only serve as protecting layer to restrain the photocorrosion of CdS, but also facilitate the charge separation in CdS by the virtue of the p-n junction formed between CdS and BiOI. 相似文献
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Shan Feng Haigang Du Taiping Xie Longjun Xu Yajing Wang 《Ceramics International》2019,45(8):10468-10474
BiOI/MnxZn1-xFe2O4 magnetic photocatalysts were successfully prepared for the first time. With the degradation of simulated RhB wastewater as a pointer to the photocatalytic reaction and combined with Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–visible diffuse reflectance spectroscopy (UV–vis DRS), and vibrating sample magnetometer (VSM), the reasons influencing the photocatalytic performance of the magnetic photocatalysts were further explored. The excessive or insufficient Mn-Zn ferrite both leads to a relatively low photocatalytic activity. When the calcination temperature reaches to 200 and 400?°C, the photocatalytic activity is enhanced significantly, but the main active component in the photocatalysts has changed from BiOI to Bi5O7I at 400?°C. The nanocomposites prepared under alcohol water environment with hollow microspheres morphology possess a highly photocatalytic efficiency, and the RhB degradation rate within 4?h in the ethanol water environment is significantly higher than that in pure water (98% vs. 59%). 相似文献
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Gang-Juan Lee Yu-Wen Chien Sambandam Anandan Cong Lv Jun Dong Jerry J. Wu 《International Journal of Hydrogen Energy》2021,46(8):5949-5962
An octahedron-like metal-organic framework (MOF) was successfully synthesized by the ultrasound irradiation synthesis method. Meanwhile, a novel visible-light-driven Cu-doped BiOI/MOF composite photocatalyst was also synthesized by the microwave irradiation. MOFs, a new class of porous crystalline materials, have attracted tremendous attention considering their broad applications because MOF possesses the repeated crystalline structures and thereby improving the harvest of solar energy and transportation of charge carriers. In this article, the result has revealed that the appropriate modification of BIOI by incorporating MOF and copper could reach the maximum hydrogen yield under visible light irradiation. The hydrogen evolution for 10% v/v lactic acid and 0.30 g L?1 of 3In/BiOI/4MOF composite photocatalyst had the maximum of 269.1 μmol h?1 g?1 for 6 h. However, as the overall time in a course of irradiation is prolongated until 48 h, 3Cu/BiOI/4MOF has the higher hydrogen evolution efficiency (7685.2 μmol) than that of 3In/BiOI/4MOF. Therefore, this study has substantially demonstrated to enhance the photocatalytic efficiency of BiOI photocatalyst using MOF and copper modified BiOI. 相似文献
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采用溶剂热-沉淀法制备BiOI负载Fe_3O_4的新型可见光催化剂BiOI/Fe_3O_4,并通过X射线衍射(XRD)和扫描电镜(SEM)对BiOI/Fe_3O_4进行表征分析。实验结果表明:金橙Ⅱ的降解率随着初始过硫酸盐(PS)浓度和催化剂浓度的增大而增大。但当PS浓度、催化剂质量浓度分别增大到0.5 mmol/L、0.5 g/L时,降解率随着两者浓度的增大而降低。随着初始pH的增大,金橙Ⅱ的降解速率逐渐降低。此外,自由基淬灭剂异丙醇和叔丁醇的加入,证明了该体系主要的活性自由基是羟基自由基(·OH)和硫酸根自由基(SO_4~(·-)).。 相似文献