Abstract
Tea polyphenols were used to synthesize Fe-based nanoparticles (TP-Fe NPs) and remove hexavalent chromium (Cr(VI)) in an aqueous solution. The results demonstrated that 0.92 was the optimal mass ratio of tea polyphenols and FeCl3, and the addition of polyvinyl alcohol (PVA) as a stabilizer significantly improved the stability of Fe nanoparticle suspension, which can be maintained stable for 60 h. Both scanning electron microscopy (SEM) and X-ray diffraction (XRD) results showed that the sizes of the synthesized Fe nanoparticles, namely, FeO, FeOOH, Fe2O3, and organic matter such as quinone range from 50 to 120 nm. TP-Fe NPs effectively remove Cr(VI) in an aqueous solution by reduction and adsorption, and the removal rate surpasses 99.5%. Because of its low cost and high reduction efficiency, TP-Fe NPs has broad application prospects for remediating Cr-contaminated soil and groundwater.
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