Authors | Mohammad Hossein Sayadi,Shahin Homaeigohar |
---|---|
Journal | Environmental Science and Pollution Research |
Page number | 15236-15247 |
Serial number | 12 |
Volume number | 28 |
IF | 2.741 |
Paper Type | Full Paper |
Published At | 2020 |
Journal Grade | ISI |
Journal Type | Electronic |
Journal Country | Belgium |
Journal Index | JCR،Scopus |
Abstract
In this study, for the first time, a TiO2/graphene (G) heterostructure was synthesized and doped by Bi and SnO2 nanoparticles through a hydrothermal treatment. The as-synthesized nanocomposite was employed for photocatalytic degradation of pentachlorophenol (PCP) under visible light irradiation. Structural characterizations such as X-ray photoelectron spectroscopy (XPS) and X-ray diffraction spectroscopy (XRD) proved the valence band alignment at Bi/SnO2/TiO2-G interfaces and crystallinity of the nanocomposite, respectively. The as-developed nanocomposite photocatalyst was able to decompose 84%PCP, thanks to the generation of a large number of active OH•− and O2 •− radicals. To achieve this optimum photodegradation efficiency, various parameters such as pH, catalyst dosage, and PCP concentration were optimized. The results showed that the PCP photodegradation process followed the first-order kinetic model and the reaction rate constant rose from 0.007 min−1 (Bi) to 0.0149 min−1 (Bi/SnO2/TiO2-G). The PCP photodegradation efficiency did not decrease significantly after 5 cycles, and the nanocomposite photocatalyst still showed a high efficiency of 68% in the last cycle. The excellent photocatalytic activity of Bi/ SnO2/TiO2-G is ascribed as well as the heterostructure of the nanocomposite photocatalyst.
tags: Advanced oxidation processes . Solar photocatalysis . Reusability . Water treatment