Adsorption Characteristics of Chlorophenols from Aqueous Solution onto Graphene
JOURNAL OF CHEMICAL AND ENGINEERING DATA(2017)
Abstract
The adsorption of chlorophenols (CPs) on pristine graphene was investigated. The adsorption capacities of graphene were 88.1 mg g(-1) for 2-chlorophenol (2-CP), 114.2 mg g(-1) for 4-chlorophenol (4-CP), 155.3 mg g(-1) for 2,4-dichlorophenol (DCP), and 175.8 mg g(-1) for 2,4,6-trichlorophenol (TCP), respectively. The equilibrium was attained during 20 min. There was no significant effect on the adsorption amounts in the pH range of pH 1.01-8.09 for 2-CP, 1.08-8.01 for 4-CP, 1.04-7.03 for DCP, and 2.86-5.63 for TCP. The Langmuir and pseudo-second-order models supplied good fitting of the experimental data. Thermodynamic constants demonstrated that the process was endothermic and spontaneous.
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Key words
graphene,chlorophenols,adsorption
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