Abstract
Photocatalytic degradation is an important method to mediate organic pollution in the environment. This article reports Ag-modified SnO2@TiO2 core-shell composite photocatalysts prepared via a hydrothermal method. The composite materials were characterized by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetry, X-ray photoelectron spectrometry, and UV-vis diffuse reflectance spectroscopy. The Ag modification and core structure in the composite enhanced the photocatalytic activity and stability of TiO2 for Rhodamine B degradation under visible light irradiation. The composite modified in 0.15 M AgNO3 showed an optimal level of photocatalytic activity, as it degraded 99.14% of Rhodamine B in 60 min while pure TiO2 only degraded 45.7% during the same time.
Highlights
Titanium dioxide (TiO2) has attracted great interest for the degradation of pollutants [1,2,3], such as most organic compounds and inorganic ions [4,5]
Ag or other noble metals deposited on the surface of TiO2 form a short-circuit battery with TiO2, which leads to effective separation of the photogenerated electrons/holes and a lower potential in the reduction reaction, greatly improving the photocatalytic activity
The photocatalytic activities of the samples were evaluated by the degradation of Rhodamine B in a 500-mL jacketed beaker, a 500 W mercury lamp was selected as the visible light source
Summary
Titanium dioxide (TiO2) has attracted great interest for the degradation of pollutants [1,2,3], such as most organic compounds and inorganic ions [4,5]. The photocatalytic performance of TiO2 is greatly restricted by its wide band gap (3.2 eV) and high electronhole recombination rate. Proposed solutions to these problems include doping with metallic or nonmetallic ions [6,7], dye photosensitization on the TiO2 surface [8], deposition of noble metals [9,10], and semiconductor modification [11]. Ag or other noble metals deposited on the surface of TiO2 form a short-circuit battery with TiO2, which leads to effective separation of the photogenerated electrons/holes and a lower potential in the reduction reaction, greatly improving the photocatalytic activity. The Ag-modified SnO2@TiO2 core-shell composites demonstrated excellent photocatalytic activity and cycle stability under visible light
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