Shape effects of goethite particles on their photocatalytic activity in the decomposition of acetaldehyde
Shape effects of goethite particles on their photocatalytic activity in the decomposition of acetaldehyde
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DOI：
10.1039/c3cy00768e
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发表时间：
2014-01-01
影响因子：
5
通讯作者：
Okayama, Toru
中科院分区：
文献类型：
--
作者：
Kakuta, Seiji;Numata, Taiki;Okayama, Toru
研究了针铁矿（α-FeOOH）的光催化活性与其颗粒形状的关系。通过硝酸铁溶液水解或Fe（OH）（2）氧化合成了不同形貌（棒状、阵列状和饼状）的针铁矿颗粒。所有合成的颗粒均由{110}和{021}晶面组成。考察了不同样品在光照下对乙醛的光催化降解活性。结果表明，针铁矿的光催化活性受其颗粒形状和比表面积的影响。进一步研究了针铁矿颗粒形状对光催化活性的影响，结果表明针铁矿{021}晶面的光催化活性高于{110}晶面。针铁矿颗粒（短棒状和饼状颗粒），因此，表现出更高的光催化活性比其他类型的颗粒（长棒状和阵列状颗粒）由于更大的{021}面。
The relationship between the photocatalytic activity of goethite (alpha-FeOOH) and the shape of its particles was investigated. Goethite particles with various morphologies (rod-like, array-like, and pancake-like) were synthesized through the hydrolysis of a ferric nitrate solution or the oxidation of Fe(OH)(2). All the particles synthesized consisted of {110} and {021} facets. The photocatalytic activities of the different samples were examined for the decomposition of acetaldehyde under irradiation. It was found that the photocatalytic activity of goethite is affected by both the shape and the specific surface area of its particles. Further investigation of the effects of the particle shape indicated that the photocatalytic activity of the {021} facets is higher than that of the {110} facets of goethite. The goethite particles (short rod-like and pancake-like particles), therefore, exhibited higher photocatalytic activities than other particle types (long rod-like and array-like particles) owing to the greater {021} facets.