Abstract
The effective removal of endocrine disruptors from water is important for human health. Herein, magnetic sorbents, composed of ZiF-67-derived carbon polyhedrons containing Co nanocrystals (Co-C) modified reduced graphene oxide (rGO) nanosheets (Co-C/rGO), were synthesized. The optimized Co-C/rGO-2 exhibited a high adsorption capacity of 175.1 mg g−1 for removal of bisphenol A (BPA) from water because of the optimized porous structure including micropores, mesopores and macropores as well as high surface area of 284.4 m2 g−1. In addition, the adsorption equilibrium of BPA was almost reached within 3 h and showed almost stable at pH 2–7. Existence of humic acid, Ca2+, K+, Na+ had little effect, while the Al3+ showed negative on the adsorption of BPA. Furthermore, the magnetic Co-C/rGO-2 can be easily recovered and showed high reuse performance remaining 83.7% of the initial adsorption capacity after the 4th recycling. The fixed-bed experiment indicated that the removal efficiency of BPA (10 μg L–1) from water can reach almost 100% at bed volume lower than 4000. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy results revealed that the adsorption of BPA was mainly dominated by the π-π interaction.
Published Version
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