Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 353, Issue -, Pages 410-420Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.04.034
Keywords
Ti-Mn binary oxide; Sorption; Oxidation; Arsenite; Water treatment
Categories
Funding
- National Key R&D Program of China [2017YFA0207203]
- National Natural Science Foundation of China [51478457]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2016DX04]
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Owing to the high toxicity and mobility, the removal of arsenite (As(III)) is significantly more difficult than arsenate (As(V)), thus representing a major challenge in arsenite-contaminated water treatment. For efficient elimination of As(III), we successfully fabricated a novel Ti-Mn binary oxide via a simultaneous oxidation and coprecipitation process. The amorphous oxide was aggregated from nanosized particles with a high specific surface area of 349.5 m(2)/g. It could effectively oxidize As(III) to As(V) and had a high As(III) sorption capacity of 107.0 mg/g. As(III) sorption occurred rapidly and equilibrium was achieved within 24 h. The kinetic data was well fitted by the pseudo-second-order equation, indicating a chemical sorption process. The material was almost independent upon the presence of competitive ions. The As(III) removal by the sorbent is a combined process coupled oxidation with sorption, where the MnO2 content is mainly responsible for oxidizing As(III) to As(V) and the formed As(V) is then adsorbed onto the surface of amorphous TiO2 content, through replacing the surface hydroxyl group or the adsorbed As(III) and forming inner-sphere surface complexes. Furthermore, the arsenic-containing oxide could be effectively regenerated and reused. The bi-functional sorbent could be used as a potentially attractive sorbent for As(III) removal in drinking water treatment and environmental remediation.
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