Rational Design of 0D/2D WO3/g-C3N4 Z-scheme Hybrid for Improving Photocatalytic Dye Degradation

摘要

A Zero-dimensional/two-dimensional(0D/2D)tungsten trioxide/graphitic carbon nitride(WO3/g-C3N4)Z-scheme hybrid was prepared by employing a simple calcination process.Then,the photocatalytic property of the WO3/g-C3N4 hybrids was assessed through their efficiency in the degradation of toxic industrial dye pollutant,Rhodamine B(RhB)and phenol under visible light irradiation.From the results and analysis,the 1% WO3/g-C3N4 composite with a larger Brunauer-Emmett-Teller(BET)surface area of 41.14 m~2g 1 compared to the pristine g-C3N4(25.25 m~2g 1)presented the uppermost improvement in the photocatalytic performance contrasted to both WO3 and g-C3N4.It achieved the degradation of RhB and phenol with an efficiency of 96% in 15 min and 98.5% in 30 min,respectively.X-ray photoelectron spectroscopy(XPS)results confirmed the existence of the internal electric field.The enhanced activity was attributed to the homogeneous distribution of the WO3 nanoparticles on the g-C3N4 nanosheets with intimate interface and matched band gap structure which favored the construction of the Z-scheme hybrid,therefore boosting the electronhole separation efficiency and maintaining the strong redox capability for photocatalytic degradation.