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• W4306752142 endingPage "108808" @default.
• W4306752142 startingPage "108808" @default.
• W4306752142 abstract "Schwertmannite (Sch) has been proved to be a promising and efficient adsorbent for the removal of various metal ions. However, how to further improve the adsorption capacity and stability of Sch to As(III), As(V) and P(V) is always a problem. In this study, we developed a method to synthesize various Schs with different initial ratios of SO 4 2- :Fe(III). Our results show that Schs can be used to remove As(III), As(V) and P(V) in a wide concentration range of pH 3.0-7.0, and negligible difference can be observed in the adsorption capacities of various Schs towards As(III), As(V) and P(V), indicating that increasing initial concentrations of SO 4 2- does not necessarily increase the adsorption capacity of Sch. In addition, the maximum adsorption capacities ( Q max ) of Sch-0.75 towards As(V) and P(V) increase with decreasing pHs, whereas increase with increasing pHs towards As(III). The Q max values of As(III), As(V) and P(V) are 80.5, 161.5 and 139.9 mg g -1 at pH 3.0, respectively, and are 214.5, 107.6 and 86.5 mg g -1 at pH 7.0, respectively, indicating that the strong dependence of Q max on pH values. Besides, we also successfully developed a method to synthesize the diatomite-modified Sch (DMS) The synthesized DMS with the ratio of Fe(III) salts and diatomite of 4:1 (DMS-4) shows the maximum adsorption capacities of As(III), As(V) and P(V) of 59.81, 151.52 and 236.97 mg g -1 at pH 3.0, respectively, and of 282.49, 126.58 and 165.02 mg g -1 at pH 7.0, respectively. DMS-4 also shows high stability during repeated experiments, and the removal efficiencies of DMS-4 to As(III), As(V) and P(V) maintain 97.42%, 88.39% and 94.72% after five cycles, whereas the removal efficiencies of Sch-0.75 rapidly decreased to 63.61%, 31.12% and 50.71% towards As(III), As(V) and P(V) after five cycles. This study provides a new method to synthesize stable DMS with high adsorption capacities towards As(III), As(V) and P(V). • Synthesis process of diatomite-modified schwertmannite was described. • The adsorption stability of schwertmannite improved a lot after modified by diatomite. • Diatomite-modified schwertmannite exhibited high removal efficiency towards As(III), As(V) and P(V)." @default.
• W4306752142 created "2022-10-19" @default.
• W4306752142 creator A5000419418 @default.
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• W4306752142 date "2022-12-01" @default.
• W4306752142 modified "2023-10-01" @default.
• W4306752142 title "Efficient removal of arsenic and phosphate contaminants by diatomite-modified schwertmannite" @default.
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• W4306752142 doi "https://doi.org/10.1016/j.jece.2022.108808" @default.
• W4306752142 hasPublicationYear "2022" @default.
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