Synthesis and application of graphene aerogel as an adsorbent for water treatment

Main Article Content

Thi Lan Nguyen Tri Tin Nguyen Hoang Tu Tran Minh Dat Nguyen Huu Hieu Nguyen

Abstract

In this research, graphene aerogel (GA) was fabricated by chemical reduction method, in which ethylenediamine (EDA) was used as a reducing and functionalising agent. The characterisation of GA was studied by density, field-emission scanning electron microscope, Brunauer-Emmett-Teller (BET) specific surface area, Fourier transform infrared spectroscopy, and X-ray diffraction. The results of the analysis showed that GA exhibits low density, ranging from 4-8 mg/cm3, high porosity, and BET specific surface area changes from 176 to 1845 m2/g. It was found that the suitable content of EDA on the synthesis of GA is 30 μl. The obtained GA was used as an adsorbent for removal of oils and methylene blue (MB) from aqueous solutions. The maximum adsorption capacities of GA for lubricant and crude oils are 160 g/g and 110 g/g respectively. The effecting factors including pH, contact time, and initial concentrations on the adsorption capacity of GA for MB were investigated. The adsorption process of MB onto GA followed the pseudo-second-order kinetic and well-fitted to Langmuir isotherm model. The maximum adsorption capacity for MB from linear Langmuir model was calculated to be 212.76 mg/g at pH 7. Accordingly, GA could be used as a potential adsorbent for removal of oils and MB from water.

 

DOI: https://doi.org/10.31276/VJSTE.61(2).23-28

Article Details

How to Cite
NGUYEN, Thi Lan et al. Synthesis and application of graphene aerogel as an adsorbent for water treatment. Vietnam Journal of Science, Technology and Engineering, [S.l.], v. 61, n. 2, p. 23-28, june 2019. ISSN 2525-2461. Available at: <http://vietnamscience.vn/index.php/VJSTE/article/view/209>. Date accessed: 21 july 2019.
Section
PHYSICAL SCIENCES