Preparation of Graphene Aerogels with Soft Templates and their Oil Adsorption Mechanism from Water

被引：0

作者：

Huang Y.-F. ^{[1
]}

Liu H.-E. ^{[1
]}

Wang Z.-Y. ^{[1
]}

Zhu J.-M. ^{[1
]}

Chen S. ^{[1
]}

机构：

[1] State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2018年 / 32卷 / 04期

关键词：

Adsorption; Emulsions; Graphene aerogel; Kinetic theory; Oil waste water;

D O I：

10.3969/j.issn.1003-9015.2018.00.007

中图分类号：

学科分类号：

摘要：

Graphene aerogel (GA) prepared with graphene oxide (GO) stabilized emulsions (GE) via hydrothermal process was obtained. Properties of GE and GA were studied by optical microscope (OM), contact angle measurement and scanning electron microscope (SEM). n-Heptane, dodecane, toluene, cyclohexane, aviation kerosene and straight-run diesel oil were used as simulated oil waste in water. Adsorption mechanism was studied by changing GA type and adsorption temperatures. Experimental results show that the adsorption process follows the pseudo-second-order model (PSO). The adsorption process is divided into three phases including macro-pore diffusion, internal meso-pore diffusion and micro-pore diffusion to equilibrium. Adsorption activation energy is 35.07 kJ∙mol-1, which indicates that the process is physical adsorption. The analyzing results show that the adsorption rates of straight-chain alkanes are faster than cycloalkanes and aromatic hydrocarbons with similar carbon numbers, and carbon number has lower impacts than oil type on adsorption rate. GAs with lower density and higher porosity show higher adsorption rates and high temperature is beneficial to adsorption. The results show that the adsorption isotherms follow Freundlich model. © 2018, Editorial Board of Journal of Chemical Engineering of Chinese Universities". All right reserved."

引用

页码：940 / 948

页数：8

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