Tetrabromobisphenol A

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Zhang et al23 (2013) reported the removal of tetrabromobisphenol A (TBBPA) from aqueous solution by GO. The effects of contact time, pH, and temperature, and the presence of coexisting anions as well as humic acid, were studied through batch experiments. The adsorption capacity decreased with an increase in temperature as well as solution pH. The presence of coexisting anions such as NO-3 SO4 -2 −, HPO4 -2 and HCO 3 2- reduced TBBPA adsorption in the order NO3 - < SO4 2- < HPO4 2- < HCO3 2-The presence of humic acid also significantly reduced the adsorption of TBBPA onto GO. The adsorption reaction followed the pseudo-second-order kinetics, while the adsorption isotherm was well described by the Langmuir model with a maximum adsorption capacity of 115.77 mg g−1 at 298 K. Thermodynamic studies indicated that the adsorption of TBBPA onto GO was feasible and spontaneous at all temperatures and was exothermic in nature. Both π–π stacking interactions and hydrogen bonding were proposed to be responsible for the adsorption of TBBPA by GO.
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