Photocatalytic activities of layered intercalated materials H 2 NiTi 4 O 10 /TiO 2 under UV and visible light irradiatio
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Photocatalytic activities of layered intercalated materials H2NiTi4O10/TiO2 under UV and visible light irradiation
Jihuai Wu∗, Yunfang Huang, Taohai Li, Jianming Lin, Miaoliang Huang and Yuelin Wei Institute of Materials Physical Chemistry, Huaqiao University, Quanzhou, 362021, China.
Abstract H2NiTi4O10/TiO2 intercalated compound was fabricated by successive intercalation reactions of H2NiTi4O10 with n-C6H13NH2/C2H5OH mixed solution and acid TiO2 sol, followed by irradiating with a high-pressure mercury lamp. H2NiTi4O10, a layered perovskite type compound with TiO2-loading, exhibited a high activity for decomposition of methyl orange under UV and visible light irradiation. The experimental results showed that methyl orange was degraded with the decomposition ratio of 59.0 % by using H2NiTi4O10/TiO2 as photocatalyst under visible light (λ > 420 nm) irradiation for 24 h. The H2NiTi4O10/TiO2 possessed higher photocatalytic activity than those commercial titania powder (Degussa P-25) which showed the decomposition ratio just only 24% under same condition.
Keywords: photocatalytic activity, intercalated material, H2NiTi4O10, TiO2
1. Introduction Recently photoelectrochemical process at semiconductors interface, such as splitting of water
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To whom correspondence should be addressed.
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and deoxidization of carbon dioxide, have received special attention because of their possible application for the conversion of solar energy into chemical energy. TiO2 is one of the most efficient photocatalysts among the semiconductors being studied, however, the application of TiO2 is yet limited due to ultra-violet light absorption of the TiO2 photocatalyst, whose band gap is large than 3.0 eV. Therefore, further investigation of the photocatalyst materials for photoelectrochemical process is essential for revealing factors of active photocatalysts and getting development of new photocatalyst materials. Incorporation of semiconductor particles via chemical reactions in the interlayer region of a lameller compound is a promising method for the fabrication of a nanocomposite consisting of host layers with ultrafine particles in the interlayer. Since in such a system the distance the photoinduced holes and electrons must diffuse before reaching the interface decreases, and the holes and electrons can be effectively captured by the electrolyte in the solution [1]. On the other hand, the coupling of two semiconductor particles with different energy levels is useful to achieve effective charge separation. Some researchers [2-7] have reported the incorporation of extremely small particles of Fe2O3, TiO2, CdS and CdS-ZnS mixture, less than 1 nm in thickness, into the interlayer of layered compound such as montmorillonite, layered double hydroxides, layered niobate and layered titanate. As expected, the photocatalytic activities of the incorporated semiconductors were much higher than that of unsupported semiconductors. In previous papers, we have succeeded in developing several new active photocatalyts such as HNbWO6/TiO2
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