Chemical-bonds Conjugated SnO₂/AgIO₄ Hybrids for Degradation of High Concentration Rhodamin B under Visible Light Illumination

Abstract

SnO₂/AgIO₄ hybrids were fabricated by an in-situ synthetic method at room temperature. The structure, morphology, light response range, separation efficiency of the electron-hole pairs and elements of the as-synthesized samples were characterized by adopting X-ray diffraction, scanning electron microscopy, UV-Vis diffuse reflectance spectroscopy, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy, respectively. The synergistically photocatalytic degradation mechanism of the as-synthesized composites was also proposed. The experimental results reveal that under the visible light irradiation the as-synthesized SnO₂/AgIO₄ hybrids can enhance the photocatalytic degradation efficiency of rhodamine B compared to pure samples. With increasing the molar ratios of AgIO₄ to SnO₂, it displays the trend of first increasing and then decreasing. When it is 1:2 in 150 min, the as-prepared hybrids have the highest degradation efficiency of 93.1%, which increases by 6550.0%, 30.5%, and 1505.0% compared to those of pure SnO₂, AgIO₄, and TiO₂ (P25), respectively. Moreover, the Sn-O-Ag cross-linking bonds are formed at the interfaces of SnO₂ and AgIO₄. In addition, superoxide anion radicals and holes play a major role in the process of photodegradation.

Keywords

photocatalysis / rhodamine B / SnO₂ / AgIO₄

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