This study proposes the use of new materials based on core-shell structure magnetic microparticles with Ag (Ag(0)-MPs) on their surface to remove bromides and chlorides from waters intended for human consumption. Hydrogen peroxide was used as oxidizing agent, Ag(0)-MPs is thereby oxidized to Ag (I)-MPs, which, when in contact with Cl and Br ions, form the corresponding silver halide (AgCl and AgBr) on the surface of Ag-MPs. The concentration of Cl and Br ions was followed by using ion selective electrodes (ISEs). Silver microparticles were characterized by high-resolution scanning electron microscopy and X-ray photoelectron spectroscopy, while the presence of AgCl and AgBr on Ag-MPs was determined by microanalysis. We analyzed the influence of operational variables, including: hydrogen peroxide concentration in Ag-MP system, medium pH, influence of Cl ions on Br ion removal, and influence of tannic acid as surrogate of organic matter in the medium. Regarding the influence of pH, Brand Cl removal was constant within the pH range studied (3.5-7), being more effective for Br than for Cl ions. Accordingly, this research states that the system Ag-MPs/HO can remove up to 67.01% of Br ions and 56.92% of Cl ions from water (pH = 7, [Ag-MPs] = 100 mg L, [HO] = 0.2 mM); it is reusable, regenerated by radiation and can be easily removed by applying a magnetically assisted chemical separation process.
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| http://dx.doi.org/10.1016/j.jenvman.2019.109731 | DOI Listing |
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