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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Hydrogel template-assisted synthesis of nanometric Fe2O3 supported on exfoliated clay
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Hydrogel template-assisted synthesis of nanometric Fe2O3 supported on exfoliated clay

机译：水凝胶模板辅助的片状粘土负载纳米Fe2O3合成

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摘要

A synthesis of metal oxide modified clays based on the hydrogel template assisted route was proposed. This novel method was verified by an intercalation of poly(acrylic acid) (PAA) into the interlayer space of montmorillonite (MT) using the in situ polymerization technique. The obtained hydrogel/clay composite with a MT/PAA mass ratio close to 1.0 exhibited an expanded layered structure and an excellent adsorption capacity for transition metal cations. These features were exploited to the modification of MT-FAA material with various amounts of Fe3+ cations by deposition at controlled pH = 2.5. The introduced Fe species favored the hydrogel burning, therefore in a subsequent step the organic template could be easily removed by calcination under oxidizing conditions at temperature protecting the clay against deep dehydroxylation. A gradual delamination of MT with an increase in the Fe content was observed after thermal treatment. This effect resulted in opening of the MT structure, manifested by a relatively high surface area and a large porosity. XRD, TEM, UV Vis-DRS and XPS measurements exhibited that the formed alpha-Fe2O3 nanoparticles were highly dispersed on the exfoliated clay, which comprised a framework stabilizing the nanophase. (C) 2015 Elsevier Inc. All rights reserved.
机译：提出了基于水凝胶模板辅助路线的金属氧化物改性粘土的合成方法。通过使用原位聚合技术将聚丙烯酸（PAA）嵌入蒙脱石（MT）的层间空间中，验证了这种新方法。所获得的MT / PAA质量比接近1.0的水凝胶/粘土复合材料表现出膨胀的层状结构和对过渡金属阳离子的优异的吸附能力。通过在受控的pH = 2.5的条件下沉积，可以利用这些特征对MT-FAA材料进行修饰，使其具有各种数量的Fe3 +阳离子。引入的铁物种有利于水凝胶燃烧，因此在随后的步骤中，可以通过在氧化条件下，在保护粘土防止深度脱羟基的温度下进行煅烧，轻松去除有机模板。热处理后观察到MT随Fe含量增加而逐渐分层。这种作用导致MT结构的开放，表现为相对较高的表面积和较大的孔隙率。 XRD，TEM，UV Vis-DRS和XPS测量表明，所形成的α-Fe2O3纳米颗粒高度分散在脱落的粘土上，该粘土包含稳定纳米相的骨架。 （C）2015 Elsevier Inc.保留所有权利。

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