Abstract
Abstract A simple one step solvotermal strategy using non-toxic and cost-effective precursors has been developed to prepare reduced graphene oxide (RGO)-Fe 3 O 4 non-nanocomposite for removal of Cr(VI). Compared with the nano-adsorbent, the RGO-Fe 3 O 4 hybrid particles with size larger than 100 nm can reduce cell toxicity in water treatment processes. The structure, surface and magnetic characteristics of the non-nanocomposite were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), and Vibrating sample magnetometer (VSM). The RGO-Fe 3 O 4 composite with the highest loading of Fe 3 O 4 demonstrates the fastest removal of 500 μg/L Cr(VI) which can reach 85% within 5 min at neutral pH. The adsorption kinetics follows the pseudo-second-order model and the adosorbent exhibits better Cr(VI) removal efficiency in water at low pH. However, the removal efficiency of Cr(VI) decreased when common hazardous ions were added in water. The large saturation magnetization (41.12 emu/g) of the synthesized non-nanoparticles allows fast separation of the adsorbent from water. The RGO-Fe 3 O 4 non-nanocomposite could be utilized as an efficient, stable, less toxic and magnetically separable adsorbent for environmental cleanup.
Published Version
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