Abstract
A novel g-C3N4/TiO2/hectorite Z-scheme composites with oxygen vacancy (Vo) defects and Ti3+ were synthesized by so-gel method and high temperature solid phase reaction. This composite exhibited high visible photo-catalytic degradation of rhodamine B (RhB). The apparent rate constant of g-C3N4/TiO2/hectorite was 0.01705 min−1, which is approximately 5.38 and 4.88 times that of P25 and g-C3N4, respectively. The enhancement of photo-catalytic efficiency of the composites can be attributed to the great light harvesting ability, high specific surface area and effective separation of electrons(e−) and holes(h+). The F element from Hectorite causes the formation of Vo and Ti3+ in TiO2, making it responsive to visible light. The effective separation of e− and h+ mainly results from Z-scheme transfer of photo-produced electrons in g-C3N4/TiO2 interface. The composites can be easily recycled and the degradation rate of the RhB still reached 84% after five cycles, indicating its good reusability.
Highlights
The dyestuff industry discharges organic sewage containing dyes and intermediate products.The organic pollutants will damage the ecological environment and cause teratogenic and carcinogenic effects in humans [1]
It is feasible to synthesize a ternary photo-catalyst by combining g-C3 N4 with TiO2 /hectorite to construct a photo-catalytic degradation of visible light
About 0.05 g g-C3 N4 and 0.1 g synthesized TiO2 /hectorite composite were ground for 30 min and the well mixed powders were calcined at 500 ◦ C for 30 min
Summary
The dyestuff industry discharges organic sewage containing dyes and intermediate products. Titanium dioxide exhibits low toxicity, low cost, high chemical and physical stability and photo-degradation of some organic pollutants in water [5]. Ti3+ into TiO2 by combining TiO2 with hectorite and making it exhibit photocatalytic ability under visible light. Non-metallic g-C3 N4 has been found to have excellent visible light absorption in recent years [19,20,21] It has the advantages of good chemical and thermal stability, low cost, water resistance and biocompatibility [22]. It is feasible to synthesize a ternary photo-catalyst by combining g-C3 N4 with TiO2 /hectorite to construct a photo-catalytic degradation of visible light.
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