Abstract
The Zn x Cd 1–x S/TiO 2 hierarchical heterostructures were successfully fabricated by combining electrospinning technology and hydrothermal methods. The morphology, crystallinity, composition and band gap of Zn x Cd 1–x S/TiO 2 were characterized by SEM, XRD, EDS, and UV-vis diffuse reflectance spectroscopy. The results indicated the sulphur concentration had a significant influence on the composition and morphology of the products. The values of the band gap energy for Zn x Cd 1–x S/TiO 2 varied from 2.33 to 2.66 eV with the change of sulphur concentration.Whenthe molar ratio of S/Ti was 0.96, the Zn x Cd 1–x S/TiO 2 hierarchical heterostructures exhibited enhanced visible light photocatalytic behaviour for the decomposition of Rhodamine B (RhB) under visible light irradiation. The photocatalytic degradation of RhB followed first-order reaction kinetics. KEYWORDS Electrospinning, heterostructures, photocatalysis, dye degradition.
Highlights
The wastewater generated by the textile dying and paperprinting industries are rated as one of the most polluting among all industrial sectors
Rhodamine B, an important representative dye, was used as a probe contaminant to evaluate the activity of ZnxCd1–xS/TiO2 photocatalyst under visible light irradiation
The ZnxCd1–xS/TiO2 hierarchical heterostructures with novel architectures were successfully fabricated by using electrospinning technology and hydrothermal processes
Summary
The wastewater generated by the textile dying and paperprinting industries are rated as one of the most polluting among all industrial sectors. Traditional techniques can generally be used efficiently for the removal of dyes. They are non-destructive since they just transfer organic compounds from water to a solid phase, which can cause secondary pollution. Photocatalytic degradation of organic contaminants has received more attention due to its high efficiency, nonselective degradation and low cost. Many researchers have focused on the photocatalytic property of ZnxCd1–xS semiconductor composite.[12,13,14,15] By adjusting the components ratio (x value), the band gap of ZnxCd1–xS can be changed. The change renders ZnxCd1–xS to exhibit both high visible light photocatalytic behaviour and adjustable conduction band (CB) potential. Rhodamine B, an important representative dye, was used as a probe contaminant to evaluate the activity of ZnxCd1–xS/TiO2 photocatalyst under visible light irradiation
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