Decontamination of Bisphenol A from Aqueous Solution by Graphene Adsorption

The decontamination of bisphenol A (BPA) from aqueous solution by graphene adsorption was investigated. The maximum adsorption capacity (q m) of graphene for BPA obtained from a Langmuir isotherm was 182 mg/g at 302.15 K, which was among the highest values of BPA adsorption compared with other carbo...

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Published inLangmuir Vol. 28; no. 22; pp. 8418 - 8425
Main Authors Xu, Jing, Wang, Li, Zhu, Yongfa
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 05.06.2012
Subjects
Adsorption
Benzhydryl Compounds
Chemistry
Decontamination - methods
Exact sciences and technology
General and physical chemistry
Graphite - chemistry
Hydrogen-Ion Concentration
Kinetics
Phenols - isolation & purification
Sodium Chloride - chemistry
Solutions
Surface physical chemistry
Temperature
Thermodynamics
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
Water treatment
Adsorption capacity
Langmuir isotherm
Bisphenol A
Kinetic model
Thermodynamics
Adsorption
Decontamination
pH
Kinetics
Aqueous solution
Adsorbent
Structure
Hydrogen bond
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Summary:The decontamination of bisphenol A (BPA) from aqueous solution by graphene adsorption was investigated. The maximum adsorption capacity (q m) of graphene for BPA obtained from a Langmuir isotherm was 182 mg/g at 302.15 K, which was among the highest values of BPA adsorption compared with other carbonaceous adsorbents according to the literature. Both π–π interactions and hydrogen bonds might be responsible for the adsorption of BPA on graphene, and the excellent adsorption capacity of graphene was due to its unique sp2-hybridized single-atom-layer structure. Therefore, graphene could be regarded as a promising adsorbent for BPA removal in water treatment. The kinetics and isotherm data can be well described by the pseudo-second-order kinetic model and the Langmuir isotherm, respectively. The thermodynamic studies indicated that the adsorption reaction was a spontaneous and exothermic process. Besides, the presence of NaCl in the solution could facilitate the adsorption process, whereas the alkaline pH range and higher temperature of the solution were unfavorable.
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ISSN:0743-7463
1520-5827
DOI:10.1021/la301476p