Rapid solid-state metathesis route to transition-metal doped titanias
Rapid solid-state metathesis route to transition-metal doped titanias
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DOI：
10.1016/j.jssc.2015.09.028
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发表时间：
2015-12
影响因子：
3.3
通讯作者：
N. Coleman;S. Perera;E. G. Gillan
中科院分区：
文献类型：
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作者：
N. Coleman;S. Perera;E. G. Gillan
快速固态分解(SSM)反应通常是短命的高放热反应，产生熔融的碱性卤化物盐，有助于产品的生长和结晶。由于反应时间短(秒)，SSM反应也可能产生动力学稳定的结构。本文研究了过渡金属掺杂二氧化钛(M-TiO2O4)的快速SSM反应。掺杂剂的目标组成为10%，元素分析表明，许多M-TiO2样品接近这一目标水平。根据表面分析，一些样品的表面掺杂含量显著增加，特别是铬和锰掺杂的样品。由于这些反应的高放热性质，在所有情况下都观察到了金红石型结构的二氧化钛。M-TiO2样品是可见的有色样品，并显示出与氧化物环境中的掺杂剂一致的磁性和光学性质。紫外光和可见光催化实验表明，这些金红石型M-TiO2粉末对亚甲基蓝染料有很强的吸收能力，在紫外光和可见光照射下均能降解染料。这项工作可能会开辟SSM反应作为一种替代的非热力学反应策略，用于掺杂到广泛的氧化物和非氧化物中。
Rapid solid-state metathesis (SSM) reactions are often short-lived highly exothermic reactions that yield a molten alkali halide salt that aids in product growth and crystallization. SSM reactions may also produce kinetically stabilized structures due to the short (seconds) reaction times. This report describes the investigation of rapid SSM reactions in the synthesis of transition-metal doped titanias (M–TiO2). The dopant targeted compositions were ten mol percent and based on elemental analysis, many of the M–TiO2samples were close to this targeted level. Based on surface analysis, some samples showed large enrichment in surface dopant content, particularly chromium and manganese doped samples. Due to the highly exothermic nature of these reactions, rutile structured TiO2was observed in all cases. The M–TiO2samples are visible colored and show magnetic and optical properties consistent with the dopant in an oxide environment. UV and visible photocatalytic experiments with these visibly colored rutile M–TiO2powders showed that many of them are strongly absorbent for methylene blue dye and degrade the dye under both UV and visible light illumination. This work may open up SSM reactions as an alternate non-thermodynamic reaction strategy for dopant incorporation into a wide range of oxide and non-oxides.