Abstract
This paper investigates the characteristics of graphene oxide (GO) for Bisphenol A (BPA) adsorption in water. Batch experiments on the influence of significant parameters were performed. While an improvement of the adsorption capacity of BPA was obtained by the increment of contact time and the initial BPA concentration, the increment of pH above 8, GO dosage, and temperature showed the reverse results. The thermodynamic study suggested that BPA adsorption on GO was an exothermic and spontaneous process. The kinetics was explained by the pseudo-second-order model which covers all steps of adsorption. The fit of the results with the Langmuir isotherm indicated the monolayer adsorption. At 298 K, the adsorption reached equilibrium within 30 min with the maximum adsorption capacity of 49.26 mg/g. The low BPA adsorption capacity of GO can be interpreted by the occurrence of oxygen-containing functional groups (OCFGs) that are able to form hydrogen bonds with the surrounding OCFGs and water molecules. This effect inhibited the role of π–π interactions that are mainly responsible for the adsorption of BPA.
Highlights
Nanomaterials have been implemented in a variety of applications for water treatment
The C/O ratio of our synthesized Graphene oxide (GO) excellently coheres with the results reported in previous studies
The adsorption kinetics of Bisphenol A (BPA) on GO could be described by the pseudo-second-order model covering the three stages of adsorption, including film diffusion, intraparticle diffusion, and the equilibrium stage
Summary
Nanomaterials have been implemented in a variety of applications for water treatment. To other CNMs, GO is composed of sp hybridized benzene rings that are able to build π–π interactions with the benzene rings of adsorbate, and even to create the cation–π bonding with metal ions/protonated amino groups This unique capacity promotes the excellence of GO as a novel adsorbent for the removal of aquatic contaminants. Bisphenol A (BPA, C15H16O2), a phenolic compound, is considered to be one of EDCs that can cause harmful effects on human and wildlife endocrine systems, even at extremely low concentrations This compound is widely used as a component in industrial products, such as plastic, food cans, epoxy resin, and flame retardants. The resembling consequence was reported by Jin et al [10] These computational studies provide valuable evidence in support of the use of GO as an effective adsorbent for the adsorption of BPA. The evaluation of the experimental results was performed to get a clear understanding of the adsorption characteristics
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