Graphene-like materials supported on sepiolite clay synthesized at relatively low temperature

被引:4
作者
Barra, Ana [1 ,2 ]
Lazar, Oana [3 ]
Mihai, Geanina [3 ]
Bratu, Catalina [3 ]
Ruiz-Garcia, Cristina [2 ,4 ]
Darder, Margarita [2 ]
Aranda, Pilar [2 ]
Enachescu, Marius [3 ,5 ]
Nunes, Claudia [1 ]
Ferreira, Paula [1 ]
Ruiz-Hitzky, Eduardo [2 ]
机构
[1] Univ Aveiro, CICECO Aveiro Inst Mat, Dept Mat & Ceram Engn, Aveiro, Portugal
[2] Mat Sci Inst Madrid, CSIC, c-Sor Juana Ines Cruz 3, Madrid 28049, Spain
[3] Univ Pilotehn Bucharest, Ctr Surface Sci & Nanotechnol, Bucharest 060042, Romania
[4] Univ Autonoma Madrid, Fac Sci, Chem Engn Dept, Madrid 28049, Spain
[5] Acad Romanian Scientists, Splaiul Independentei 54, Bucharest 050094, Romania
基金
芬兰科学院;
关键词
Sepiolite; Sucrose; Supported graphene; Microwave pyrolysis; Hydrothermal carbonization; HYDROTHERMAL CARBONIZATION; RAMAN-SPECTROSCOPY; CARBONS; POLYACRYLONITRILE; GRAPHITE; POROSITY;
D O I
10.1016/j.carbon.2023.118767
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The preparation of solids with graphitic structure usually requires synthesis procedures using very high temperatures. In this work, a comparative study involving different experimental strategies of synthesis at relatively low temperature was carried out to obtain graphene-like materials supported on microporous sepiolite (SEP) clay. The final objective was the optimization of the development of new clay-graphitic nanostructured materials to achieve porous solids while saving energy and time during the preparation stages. The pyrolysis of sucrose (SUC), used as carbon precursor, was accomplished by microwave (MW) pyrolysis or tube furnace (TF) pyrolysis at 200 or 500 degrees C followed by a hydrothermal carbonization (HTC) step. The resulting carbon-clay nanoarchitectures were characterized by Raman and Infrared spectroscopy, X-ray diffraction, elemental analysis, electron microscopy, and nitrogen adsorption-desorption isotherms. The MW200 and TF200 treatments caramelized SUC and the post-HTC step was fundamental to obtain porous carbonaceous materials. The TF500 pyrolysis produced predominantly crystalline carbon, while the MW500 pyrolysis formed an amorphous material. Moreover, the high-resolution transmission electron microscopy observations of TF500 sample revealed a crystalline material with a d-spacing of 0.33 nm, matching the graphitic lattice. All the treatment conditions performed at 500 degrees C i.e., MW or TF followed or not by HTC, resulted in mesoporous carbons with a specific surface area above 200 m(2) g(-1). The MW pyrolysis saved 100 min of the reaction time in comparison to TF pyrolysis to obtain the carbonaceous porous materials.
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页数:10
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