The elimination of bisphenol A (BPA) from aqueous solution by adsorption on graphene oxide (GO) was investigated. The maximum adsorption capacity (qm) of GO for BPA estimated from the Langmuir isotherm was 87.80 mg•g -1 at 25 °C. The required contact time to reach adsorption equilibrium was about 30 min, which was much shorter than that of activated carbon. The adsorption kinetics and isotherm data fitted well with the pseudo-second-order kinetic model and the Langmuir isotherm, respectively. Neutral pH and low solution temperature were favorable for adsorption, whereas the presence of NaCl in the solution was unfavorable. The GO had good recyclability and could be reused several times with a slight decline in adsorption ability. Both hydrogen bonding and π-π interaction were thought to be responsible for the adsorption of BPA on GO. The excellent adsorption capacity and high adsorption rate of GO result from its sheet-like structure and the abundant oxygen-containing groups on its surface. Although qm of GO for BPA is lower than that of graphene, GO has the benefits of large scale production, a hydrophilic surface with plenty of oxygen-containing groups, and good dispersion in water. Therefore, GO can be regarded as a good potential adsorbent for water treatment.
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