Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis

Q3 Materials Science

Cerâmica Pub Date : 2021-12-01 DOI:10.1590/0366-69132021673843084

L. M. Santos, D. Silva, M. R. Santos, A. Machado

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引用次数: 1

Abstract

Mesoporous TiO 2 nanoparticles were synthesized by the sol-gel method and using hydrothermal treatment at 200 ºC during different time intervals, which allowed the evaluation of the time or the treatment on the structural, morphological, and optical properties of the oxides. TEM micrographs showed that the morphology of the materials was characterized by the presence of spherical clusters, while the crystalline phases of the anatase and brookite mixtures were analyzed by X-ray diffraction and Raman spectroscopy. A type IV profile was identified from the results of specific surface area, which is characteristic of the mesoporous material with strong and weak affinity. The band gap in the range of 3.29 and 3.40 eV, estimated by the Kubelka-Munk function, showed a gradual increase as a result of oxide crystallization. It was found that 8 h of treatment in a hydrothermal system was sufficient to synthesize a photocatalyst with optimal photocatalytic performance. This efficiency was probably based on a good correlation between physical and chemical factors, such as high surface area and porosity, the improved capability of photon adsorption in the visible range, crystallinity, and a favorable content of brookite.

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水热热处理时间对介孔纳米tio2合成的影响

采用溶胶-凝胶法制备了介孔二氧化钛纳米颗粒，并在200℃下进行了不同时间间隔的水热处理，以评价处理时间或处理时间对氧化物的结构、形态和光学性能的影响。TEM显微图显示，材料的形貌以球形团簇的存在为特征，而通过x射线衍射和拉曼光谱分析了锐钛矿和brookite混合物的晶相。通过比表面积分析，确定了四型结构，这是具有强亲和力和弱亲和力的介孔材料的特征。根据Kubelka-Munk函数估计，在3.29 ~ 3.40 eV范围内的带隙由于氧化物结晶而逐渐增大。结果表明，在水热系统中处理8h就足以合成具有最佳光催化性能的光催化剂。这种效率可能是基于物理和化学因素之间的良好相关性，如高表面积和孔隙度，在可见光范围内光子吸附能力的提高，结晶度和良好的布鲁克石含量。

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来源期刊

Cerâmica Materials Science-Ceramics and Composites

CiteScore

1.90

自引率

0.00%

发文量

审稿时长

10 weeks

期刊介绍： A Revista Cerâmica, órgão oficial da Associação Brasileira de Cerâmica (ABCERAM) publica contribuições originais de interesse na área de cerâmica, compreendendo arte cerâmica, abrasivos, biocerâmicas, cerâmicas avançadas, cerâmica branca, cerâmica de mesa, cerâmica eletroeletrônica, cerâmica estrutural, cerâmica magnética, cerâmica nuclear, cerâmica óptica, cerâmica química, cerâmica termomecânica, cerâmica vermelha, cimento, compósitos de matriz cerâmica, materiais refratários, materiais de revestimento, matérias-primas, vidrados, vidros e vitrocerâmicas, análise microestrutural, ciência básica, instrumentação, processos de fabricação, síntese de pós, técnicas de caracterização etc.