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Pen Liu

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Proceedings Article | 21 October 2009 Paper

Preparation and photocatalysis properties of La-doped nano-NiO novel photocatalyst

Peng Liu, Zhiyuan Yang, Pan Ran

Proceedings Volume 7493, 749361 (2009) https://doi.org/10.1117/12.840080

KEYWORDS: Lanthanum, Doping, Ultraviolet radiation, Magnesium, Adsorption, Ions, Nickel, Crystals, Sol-gels, Krypton

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The novel photocatalyst, La-doped Nano-NiO, was prepared by sol-gel with nickel nitrate hexahydrate and lanthanum salt, characterized by means of XRD. The photocatalytic activities of prepared La-NiO photocatalysts were evaluated by degradation of Direct Bordeaux (DB) solution as model compound under irradiation of UV and daylight lamp. The results show that Pure and La-doped NiO are a cubic perovskite structure with space group Fm-3m (225). The grain size of NiO powder decreases whereas the crystal plane spacing of NiO increases with the doping contents of La in NiO increasing. The degradation rates of two kinds of La-doped NiO after UV irradiation for 180min are 98.5% and 65.2%, under daylight, reaches 66.3% and 71.9% respectively. Using six times, the degradation rates under UV are still 49.5% and 47.7%. Meanwhile, the catalyst surface reaction rate constants (K_r) have greatly improved comparing with Pure NiO. The XRD analysis shows that a small amounts of perovskite-like structure of La_xNiO_y exists in composite structure of La-NiO, which contributes to the increase of photo-catalytic activities.

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