Enhanced arsenic removal by reusable hexagonal CeO2/Fe2O3 nanosheets with exposed (0001) facet br

Arsenite in wastewater has caused increasing concern because of high toxicity and mobility. Iron oxides are widely available and regarded as effective adsorbents for arsenic. However, conventional iron oxides usually are only effective for arsenate (As(V)) adsorption by complexation, but not for As(III) adsorption because of their poor catalytic oxidation activities, which greatly limits arsenic removal efficiency. In this study, a uniform hexagonal Fe-Ce bimetal oxide nanosheets (Fe0.21Ce0.29O) enclosed by high active (0001) planes was synthesized by a solvothermal method to im-prove the catalytic activity of Fe2O3. The experimental results showed that adsorption capacity of Fe0.21Ce0.29O reached 61.1 mg/g for arsenic and 70 % of that at equilibrium was achieved in <10 min. Based on characterization analyses and density functional theory simulation, the new insight in oxidation and complexation mechanism of arse-nic was proposed. Firstly, As(III) was adsorbed to adsorbent surface by forming stable structure of Ce-O-As or Fe-O-As, and then converted into As(V) by dissolved oxygen under the catalysis of (0001) planes densely distributed on Fe2O3 and CeO2 surfaces. The formed As(V) species were bound on Fe0.21Ce0.29O surface by forming bidentate and monodentate surface complexes. Finally, the safety of As-containing solution treated with Fe0.21Ce0.29O was well proved by the zebrafish embryo developmental toxicity tests.

Automated summary

This study synthesized a hexagonal Fe-Ce bimetal oxide nanosheets with high catalytic activity to improve the adsorption efficiency of iron oxides for arsenic removal. The experimental results showed that the nanosheets had a high adsorption capacity for arsenic and achieved equilibrium in a short period of time. The study also proposed a new insight into the oxidation and complexation mechanism of arsenic.