Preparation and Organic Gas Adsorption Properties of Rice Husk-Based Silica Gel/Graphene Composites
The cheap and renewable rice husks have been used to prepare the desilication solution with sodium carbonate through pyrolysis and hydrothermal treatment.Then the rice husk-based silica gel/graphene composites(GRHS)have been pre-pared with graphene oxide dispersion in an acidic environment.The product structure was characterized using the scanning elec-tron microscopy and microporous physical adsorption analyzer,with a focus on studying the adsorption and cyclic adsorption sta-bility of GRHS towards water vapor and n-hexane.The results show that GRHS has the average pore size and specific surface area of 2.87 nm and 723.22 m 2/g,respectively.There are more nano-scale particles on the surface of GRHS,and a three-dimension-al network structure of silica,compared with the uncomposited rice husk-based silica gel.At 20℃,the adsorption capacity of GRHS for water vapor was 0.097 g/g,which is much lower than that of RHS(0.226 g/g);The adsorption capacity of GRHS for n-hexane was 0.332 g/g,which is higher than that of RHS(0.217 g/g).At the 7th adsorption,the adsorption capacity for n-hexane decreased by 0.023 g/g compared to the 1st adsorption,and the adsorption capacity for water vapor increased by 0.012 g/g compared to the 1st adsorption,which is beneficial for improving its service life in VOCs recovery.
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