A study of photocatalytic and photoelectrochemical activity of as-synthesized WO3/g-C3N4 composite photocatalysts for AO7 degradation
| Autor: | Ramyakrishna Pothu, R.A. Senthil, C.K. Senthil Kumar, Prabhakarn Arunachalam, Adikesavan Selvi, Rajender Boddula, Jagannathan Madhavan, Abdullah M. Al-Mayouf, A. Priya |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Materials science Scanning electron microscope Materials Science (miscellaneous) Composite number 02 engineering and technology 010402 general chemistry 01 natural sciences Acid orange 7 chemistry.chemical_compound lcsh:TA401-492 Chemical Engineering (miscellaneous) lcsh:TJ163.26-163.5 Photodegradation Visible-light Renewable Energy Sustainability and the Environment Graphitic carbon nitride Tungsten oxide 021001 nanoscience & nanotechnology Tungsten trioxide 0104 chemical sciences Fuel Technology lcsh:Energy conservation chemistry Chemical engineering Photocatalysts Photocatalysis lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Visible spectrum |
| Zdroj: | Materials Science for Energy Technologies, Vol 3, Iss, Pp 43-50 (2020) |
| ISSN: | 2589-2991 |
| Popis: | Herein, we have examined the effect of tungsten trioxide (WO3) doping in graphitic carbon nitride (g-C3N4) photocatalysts towards photodegradation of organic pollutant in aqueous medium. A sequence of visible light driven WO3/g-C3N4 composites were synthesized at various mole ratios (1, 2, 3 and 5%) of WO3 into g-C3N4 via simple and short-time wet-impregnation method. The fabricated photocatalytic materials were investigated by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, UV–vis diffuse reflection spectroscopy (DRS), photoluminescence (PL) and scanning electron microscopy (SEM). The photocatalytic performance of the fabricated photocatalysts were assessed by the degradation of acid orange 7 (AO7) in visible-light illumination. The WO3/g-C3N4 composites were found to be exhibit an improved visible-light induced photocatalytic performances compared to the pure WO3 and g-C3N4. However, among the different composites, the optimized 3 wt% WO3/g-C3N4 composite has shown complete (100%) degradation efficiency of AO7 after 75 min which is superior than the pure g-C3N4. This synergistic enhancement might be credited to its increased light absorption in visible-light region and the photoexcited electron transfer from g-C3N4 to WO3 catalyst surface and enhanced charge separation efficiency. Additionally, the photo-electrochemical measurements of 3 wt% WO3/g-C3N4 composite has exhibited a quicker migration of the photo-excited charge-carriers. The radical scavenging studies inferred that the O2 − are the key species accountable for the degradation of AO7 for fabricated WO3/g-C3N4 composite materials. Hence, the higher photocatalytic activity, long-term stability and recyclability of WO3/g-C3N4 composite has displayed it is a auspicious material for the photocatlytic degradation of organic contaminant applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|