Abstract
Two types of graphene oxide (GO), namely, superparamagnetic GO (SM-GO) and chemically modified superparamagnetic amino-functionalized GO (SM-NGO), were prepared in this study. The adsorption of 17β-estradiol (E2) and bisphenol A (BPA) by the two types of GO composites was investigated. SM-NGO showed better adsorptive performance than SM-GO in adsorbing E2 and BPA. Moreover, E2 was suitably removed by both adsorbents, which indicated the stronger interaction of E2 with the composites than BPA. The performance of the sorbents was examined through pH, kinetic, and isotherm experiments. The adsorption of E2 and BPA was favorable under neutral condition. The rate-limiting step in the adsorption process was chemisorption for both adsorbents, which fit well with the pseudo-second-order kinetic model. The adsorption isotherms were described by the Langmuir model. Moreover, the theoretical maximum adsorption capacity (Qmax) of E2 by SM-NGO and SM-GO reached 106.38 and 52.91 mg g−1, respectively, and the corresponding Qmax values for BPA were 41.32 and 18.11 mg g−1. Both nanocomposites can be easily separated by a commercial magnet within a few seconds. Therefore, SM-NGO is a promising magnetic adsorbent of heterogeneous organic chemicals.
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