S. A. Kurnosenko, A. A. Burov, O. I. Silyukov, V. V. Voytovich, I. A. Zvereva
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引用次数: 0
摘要
采用陶瓷法在可变条件下合成了层状钙钛矿类铌酸盐APb2Nb3O10 (A = Rb, Cs),获得了具有较高相纯度的样品,是一种很有前途的可见光活性光催化剂。所制备的氧化物在水中几乎不发生质子化和层间空间的水化。两相APb2Nb3O10经酸处理得到相应的质子化水合产物HxA1−xPb2Nb3O10∙yH2O。结果发现,样品的质子取代层间阳离子的倾向明显取决于A+阳离子:含rb的铌酸盐在6 M硝酸的单次处理下就能完全质子化(x = 1),而含cs的铌酸盐只有在酸溶液多次更新后才能获得足够高的质子化度(x≥0.9)。将得到的质子化铌酸盐在水热条件下进行额外的水处理,与质子化前体相比,可以产生新的水合衍生物,其对层间脱水的热稳定性增强。
Optimization of Methods for Synthesis and Protonation of Layered Perovskite-Structured Photocatalysts APb2Nb3O10 (A = Rb, Cs)
Synthesis of layered perovskite-like niobates APb2Nb3O10 (A = Rb, Cs), being promising visible light active photocatalysts, has been conducted by the ceramic method under variable conditions to obtain the samples with the highest possible phase purity. The oxides prepared were shown practically not to undergo protonation and hydration of the interlayer space upon keeping in water. Both phases APb2Nb3O10 were used to yield corresponding protonated hydrated forms HxA1 − xPb2Nb3O10∙yH2O via acid treatment. It was found that the propensity of the samples to the substitution of interlayer cations by protons depends clearly on the A+ cation: while the Rb-containing niobate is capable of complete protonation (x = 1) upon a single treatment with 6 M nitric acid, the Cs-containing counterpart gives a high enough protonation degree (x ≥ 0.9) only after several renewals of the acid solution. The protonated niobates obtained were exposed to an additional water treatment under hydrothermal conditions, which allowed producing new hydrated derivatives with the enhanced thermal stability towards interlayer dehydration as compared with the protonated precursors.
期刊介绍:
Glass Physics and Chemistry presents results of research on the inorganic and physical chemistry of glass, ceramics, nanoparticles, nanocomposites, and high-temperature oxides and coatings. The journal welcomes manuscripts from all countries in the English or Russian language.