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Synthesis and characterization of a heterojunction rGO/ZrO2/Ag3PO4 nanocomposite for degradation of organic contaminants
- Source :
- Journal of Hazardous Materials. 358:416-426
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Synergy between surface adsorption and photocatalysis is key for effective contaminant degradation in the liquid phase. Herein, we report a heterojunction photocatalyst of reduced graphene oxide (rGO)/zirconium dioxide (ZrO2)/silver phosphate (Ag3PO4) that incorporates this synergy for 4-nitrophenol (PNP) removal. Compared with other photocatalyst combinations, ZrO2 and Ag3PO4 coupling generates reactive species with greater degradation potential. ZrO2 and rGO were synthesized by a green approach using a one-step hydrothermal reaction in ethanol–water. The growth of rGO/ZrO2 and Ag3PO4 were accomplished and the functions of each part were well developed together. The rGO/ZrO2/Ag3PO4 composite exhibited enhanced light absorption and a low band gap energy (2.3 eV) owing to rGO and Ag3PO4 integration. The composite’s photocatalytic activity was much higher than that of ZrO2, Ag3PO4, or ZrO2/Ag3PO4. The maximal adsorption of PNP was 26.88 mg/g, and a pseudo-first-order model described the PNP degradation kinetics (k = 0.034 min−1). Synergy between the three components resulted in 97% PNP removal in 90 min, and even after five cycles, 94% PNP removal was obtained. The quantum yield of the system (7.31 × 10−5 molecules/photon) was compared with those in previous reports to assess the photocatalytic performance and energy requirements.
- Subjects :
- Environmental Engineering
Materials science
Nanocomposite
Graphene
Health, Toxicology and Mutagenesis
Silver phosphate
Oxide
Quantum yield
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Pollution
0104 chemical sciences
law.invention
chemistry.chemical_compound
Adsorption
chemistry
Chemical engineering
law
Photocatalysis
Environmental Chemistry
Degradation (geology)
0210 nano-technology
Waste Management and Disposal
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 358
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi...........3bc86ad13f74c8ec0ad898870caf8df1