Comparing Two New Composite Photocatalysts, t-LaVO4/g-C3N4 and m-LaVO4/g-C3N4, for Their Structures and Performances

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• 作者：Yiming He ; Jun Cai ; Lihong Zhang ; Xiaoxing Wang ; Hongjun Lin ; Botao Teng ; Leihong Zhao ; Weizheng Weng ; Huilin Wan ; Maohong Fan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 9, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：5905-5915
• 全文大小：755K
• 年卷期：v.53,no.14(April 9, 2014)
• ISSN：1520-5045

文摘

The objective of this research was to prepare, characterize, and evaluate two new composite photocatalysts: t-LaVO₄/g-C₃N₄ and m-LaVO₄/g-C₃N₄. The two catalysts were synthesized with m-LaVO₄ or t-LaVO₄ and g-C₃N₄, and characterized by various techniques including Brunauer鈥揈mmett鈥揟eller method (BET), thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet鈥搗isible-light (UV-vis) diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The structure characterizations indicate that the two composites have similar phase composition. Both of them consist of LaVO₄ and g-C₃N₄. Meanwhile, their photoabsorption performance is also similar. The photocatalytic test indicates that both m-LaVO₄ and t-LaVO₄ can effectively promote the photoactivity of g-C₃N₄, as demonstrated with the PL and photocurrent鈥搕ime experiments, although the optimal concentrations of LaVO₄ in the two catalysts are different. Both LaVO₄/g-C₃N₄ and t-LaVO₄/g-C₃N₄ are promising photocatalysts for degradation of RhB.