composite photocatalyst
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2022 ◽  
Author(s):  
Xiu-Jie Yang ◽  
Lunan Wu ◽  
Ruona Hu ◽  
Junqi Xing ◽  
Guohao Zhou ◽  
...  

In this paper, hollow Bi2MoO6 microspheres (h-Bi2MoO6) were prepared via a simple solvothermal method. Then, h-Bi2MoO6/(Zn/Ti)LDH composite photocatalyst were prepared through in-situ grown of Zn-Ti layered double hydroxide ((Zn/Ti)LDH), owing...


2021 ◽  
Vol 6 (1) ◽  
pp. 9
Author(s):  
Yu-Hsun Nien ◽  
Jhih-Fong Chen ◽  
Cai-Yin Fang ◽  
Ming-Sheng Liu

Water polluted by organic dyes is a serious environmental problem. In response to this, the aim of this research is to degrade dye wastewater using a modified photocatalyst. Since sunlight only has less than 5% UV energy, for a general photocatalyst, using sunlight for excitation to decompose organic pollutants is not an effective way. Therefore, we manufactured the modified photocatalyst by zirconium dioxide, graphene oxide, and titanium dioxide. This was to better improve the photo-degradation efficiency for the degradation of organic pollutants. The modified photocatalyst was analyzed by X-ray diffractometer (XRD), Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy (Raman), Scanning Electron Microscope (SEM), and Energy-dispersive X-ray spectroscopy (EDS). The results demonstrated that the modified photocatalyst can be activated by the absorption of visible light. Additionally, the band gap of the modified photocatalyst would decrease. The photodegradation percentage of the modified photocatalyst under visible light (Philips TL-D 8W/865 fluorescent tube) for 4 h reached up to 49.92%. At the third test after ultrasonic washing for the cyclic test, the photodegradation percentage of the modified photocatalyst could still maintain at 47.71%. This indicates that the modified photocatalyst has good stability and reusability, and so this can be reused in this regard.


Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1532
Author(s):  
Yi-Chen Chung ◽  
Pei-Jie Xie ◽  
Yi-Wei Lai ◽  
An-Ya Lo

In an attempt to improve the photocatalytic activity of anatase TiO2, we developed a composite photocatalyst composed of hollow TiO2 microspheres (hTS) and graphene. The hTS were prepared through a two-step hydrothermal process, where SiO2 microspheres with desirable diameters of 100–400 nm were used as sacrificial templates. Accordingly, the effect of the hTS cavity size on the activity of the catalyst in wet CO2 photoreduction (CO2PR) was studied. Furthermore, it was established that the hydrothermal pH value crucially influences the photocatalytic activity of the hTS photocatalyst, as well as its composition and microstructure. The hTS photocatalyst was also combined with graphene (0–90 wt%) to improve its photocatalytic activity. This study provides insight into the optimal microsphere diameter, hydrothermal pH value, and graphene/hTSx ratio required for designing hollow microsphere-based photocatalysts with enhanced CO2PR performances.


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