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Correlation between the Properties of Sol-Gel Synthesized Graphene/Titania Hybrid Nanostructures and Their Catalytic Activity in Selective Aerobic Oxidation of Alcohols
ECS Journal of Solid State Science and Technology ( IF 1.8 ) Pub Date : 2020-11-16 , DOI: 10.1149/2162-8777/abc80f
Hamed M. Alshammari 1 , Nadir Abbas 2 , Jamal R. Humaidi 1 , Salma A. Alzahrani 1 , Abdullah S. Alshammari 3 , Mosaed S. Alhumaimess 4 , Obaid F. Aldosari 5 , Hassan M. A. Hassan 4, 6
Affiliation  

A low-cost sol-gel process was used to synthesize hybrids of graphene and titania without the use of surfactants or additives. A less frequently used titania precursor, titanium oxychloride, was used to yield TiO2 nanoparticles and dispersed graphene was used in the reaction mixture to provide a surface for the nano-sized titania particles’ dispersion. The obtained samples after filtration and drying were calcined at 400 C to get an anatase phase titania powder. Various techniques like XRD, SEM, and TEM have investigated the structure of the prepared samples. The hybrid’s structural morphology shows the incorporation of the transition metal oxide (TiO2) particles into the dispersed layers of graphene. The size of the TiO2 particles and the nature of the interaction among the prepared hybrid materials were explored. Nitrogen gas physisorption studies revealed that graphene adds variety to the pore size of hybrid materials which is a special property of hybrid structures. Additionally, the catalytic performance of hybrid nanostructured samples was investigated in the catalytic reaction for benzyl alcohol oxidation. It was found that the addition of graphene content in the hybrid increases the rate of reaction. The increase in the reaction rate is attributed to the ease of electron transfer through graphene layers. This study provides a systematic view of graphene/titania hybrids’ preparation, their resulting properties, and their catalytic performance in the benzyl alcohol oxidation reaction. Results and conclusions show interesting possibility of using two-dimensional graphene with nanoparticles for further studies in benzyl alcohol oxidation.



中文翻译:

溶胶-凝胶合成的石墨烯/二氧化钛杂化纳米结构的性质与其在乙醇选择性好氧氧化中的催化活性之间的相关性

不使用表面活性剂或添加剂,使用低成本的溶胶-凝胶法合成石墨烯和二氧化钛的杂化物。使用较少使用的二氧化钛前体,三氯氧化钛生产TiO 2纳米颗粒,并在反应混合物中使用分散的石墨烯,以提供纳米级二氧化钛颗粒分散体的表面。过滤并干燥后,将获得的样品在400℃下煅烧以获得锐钛矿相二氧化钛粉末。XRD,SEM和TEM等各种技术已经研究了所制备样品的结构。杂化物的结构形态显示过渡金属氧化物(TiO 2)颗粒掺入到石墨烯的分散层中。TiO 2的尺寸研究了制备的杂化材料中的颗粒和相互作用的性质。氮气的物理吸附研究表明,石墨烯为杂化材料的孔径增加了多样性,这是杂化结构的特殊性能。另外,在苄醇氧化催化反应中研究了杂化纳米结构样品的催化性能。发现在杂化物中添加石墨烯含量增加了反应速率。反应速率的增加归因于电子容易通过石墨烯层的转移。这项研究提供了石墨烯/二氧化钛杂化物的制备,其最终性质以及它们在苯甲醇氧化反应中的催化性能的系统视图。

更新日期:2020-11-16
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