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Study on the mechanism of preparation of graphene oxide by improved Hummers method

Authors： XU Bo, LI Chunli, ZHANG Haoyue, GONG Zhe, YU ying, QIU Guangming

Units： Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010000

KeyWords： Improved Hummers method; graphene oxide; oxidation degree; thermal stability

ClassificationCode：TQ127.11

year,volume(issue):pagination： 2021,41(6):18-26

Abstract：

Based on the improved Hummers method, graphene oxide (GO) was prepared without sodium nitrate.The effects of oxidant dosage and oxidation reaction time at medium temperature on the GO oxidation degree were studied in this experiment.The morphological structure of GO samples was characterized by SEM; The functional groups and oxidation degree of the samples were analyzed by Fourier infrared spectroscopy (FT-IR), X-ray energy spectrum analysis (EDS), laser microscopic Raman spectroscopy (Raman) ;The thermal stability of the samples was tested by Thermogravimetric analysis (TG-DTG).The SEM image showed that the amount of oxidant and the oxidation reaction time affected the surface morphology of the prepared GO to some extent; Raman spectra showed that the prepared GO had different defect densities; FT-IR and EDS analysis showed that the surface of GO was rich in oxygen-containing functional groups, The oxygen content of different GO samples was between 33%-43%, and the C/O was between 1.9-1.1;The correlation between TGA analysis and elemental analysis results indicated that the thermal weight loss is obviously dependent on element composition, due to the increase of oxygen content, GOc-3 had the largest weight loss, while GOa-1 had better thermal stability.The analysis of the oxidant dosage and oxidation time of GO prepared by the improved Hummers method provides theoretical and data support for the subsequent functional modification of GO.

Funds：

内蒙古自然科学基金（2019MS05067、2020MS05033）

AuthorIntro：

徐博（1996-），男，吉林省公主岭市人，硕士生，研究方向为膜分离水处理技术，E-mail：914739874@qq.com

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