Effect of hydrothermal temperature on microstructure and optical properties of ZnIn2S4 microspheres and their photocatalytic degradation of methylene blue
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ZnIn2S4 microspheres were synthesized via a hydrothermal method using zinc chloride (ZnCl2), indium chloride tetrahydrate(InCl3·4H2O) and L-cysteine (C3H7NO2S). The effect of hydrothermal temperatures (160 oC, 200 oC and 240 oC) on thecrystallinity, morphology and optical properties of the synthesized powders was investigated. The synthesized products werecharacterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electronmicroscope (FE-SEM) and transmission electron microscope (TEM). The results showed that the synthesized powders werepure ZnIn2S4 with a hexagonal structure. The ZnIn2S4 powders were microspheres with diameters of 8.3-9.5 µm, constructedfrom several nanosheets. These nanosheets interconnected with each other, forming a pore structure. With increasinghydrothermal temperature, the nanosheets increased in thickness and the width of the pores between the nanosheets expanded. The ZnIn2S4 powder synthesized at 240 oC exhibited stronger UV-Vis absorption and photoluminescence (PL) intensities thanthe other samples. The photocatalytic activity of the ZnIn2S4 photocatalyst was investigated by photodegradation of methyleneblue under blue light irradiation; 97% of the methylene blue degraded within 210 min. Photostability of the ZnIn2S4photocatalyst was also investigated.
Abstract
ZnIn2S4 microspheres were synthesized via a hydrothermal method using zinc chloride (ZnCl2), indium chloride tetrahydrate(InCl3·4H2O) and L-cysteine (C3H7NO2S). The effect of hydrothermal temperatures (160 oC, 200 oC and 240 oC) on thecrystallinity, morphology and optical properties of the synthesized powders was investigated. The synthesized products werecharacterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electronmicroscope (FE-SEM) and transmission electron microscope (TEM). The results showed that the synthesized powders werepure ZnIn2S4 with a hexagonal structure. The ZnIn2S4 powders were microspheres with diameters of 8.3-9.5 µm, constructedfrom several nanosheets. These nanosheets interconnected with each other, forming a pore structure. With increasinghydrothermal temperature, the nanosheets increased in thickness and the width of the pores between the nanosheets expanded. The ZnIn2S4 powder synthesized at 240 oC exhibited stronger UV-Vis absorption and photoluminescence (PL) intensities thanthe other samples. The photocatalytic activity of the ZnIn2S4 photocatalyst was investigated by photodegradation of methyleneblue under blue light irradiation; 97% of the methylene blue degraded within 210 min. Photostability of the ZnIn2S4photocatalyst was also investigated.
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