Ag-Co3O4: Synthesis, characterization and evaluation of its photocatalytic activity towards degradation of rhodamine B dye in aqueous medium

doi:10.1016/j.cjche.2018.02.024

Abstract

Abstract: Synthesis, characterization of Co₃O₄ and Ag-Co₃O₄ composites and evaluation of their photo-catalytic activities towards photo-degradation of aqueous solution of rhodamine B dye under irradiation of visible light have been described in this paper. Co₃O₄ was prepared by solid phase mechano chemical process using Co(NO₃)₂·6H₂O and NH₄HCO₃ as precursor materials. Ag was deposited on Co₃O₄ from AgNO₃ using Calotropis gigantea extract as reducing agent. XRD, SEM and FTIR were used for characterization of prepared composites. Photo-catalytic efficiencies of as-prepared Co₃O₄ and Ag-Co₃O₄ were evaluated for aqueous phase photo-degradation of rhodamine B. It was found that deposition of Ag on Co₃O₄ highly enhanced the photo-catalytic activity of Co₃O₄. Photo-catalytic degradation followed the Eley-Rideal mechanism. About 100% and 91% photo-degradation of 40 ml dye solution achieved at 313 K in 90 and 120 min over 0.05 g of Ag-Co₃O₄ as photo-catalyst using 100 and 200 mg·L^-1 as initial concentration of dye respectively.

Key words: Co₃O₄, Ag-Co₃O₄, Photo-catalysis, Photo-degradation, Calotropis gigantea, Rhodamine B, Elay-Rideal mechanism

摘要： Synthesis, characterization of Co₃O₄ and Ag-Co₃O₄ composites and evaluation of their photo-catalytic activities towards photo-degradation of aqueous solution of rhodamine B dye under irradiation of visible light have been described in this paper. Co₃O₄ was prepared by solid phase mechano chemical process using Co(NO₃)₂·6H₂O and NH₄HCO₃ as precursor materials. Ag was deposited on Co₃O₄ from AgNO₃ using Calotropis gigantea extract as reducing agent. XRD, SEM and FTIR were used for characterization of prepared composites. Photo-catalytic efficiencies of as-prepared Co₃O₄ and Ag-Co₃O₄ were evaluated for aqueous phase photo-degradation of rhodamine B. It was found that deposition of Ag on Co₃O₄ highly enhanced the photo-catalytic activity of Co₃O₄. Photo-catalytic degradation followed the Eley-Rideal mechanism. About 100% and 91% photo-degradation of 40 ml dye solution achieved at 313 K in 90 and 120 min over 0.05 g of Ag-Co₃O₄ as photo-catalyst using 100 and 200 mg·L^-1 as initial concentration of dye respectively.

关键词: Co₃O₄, Ag-Co₃O₄, Photo-catalysis, Photo-degradation, Calotropis gigantea, Rhodamine B, Elay-Rideal mechanism

Muhammad Saeed, Majid Muneer, Nida Mumtaz, Mohsin Siddique, Nadia Akram, Muhammad Hamayun. Ag-Co₃O₄: Synthesis, characterization and evaluation of its photocatalytic activity towards degradation of rhodamine B dye in aqueous medium[J]. Chin.J.Chem.Eng., 2018, 26(6): 1264-1269.

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Ag-Co₃O₄: Synthesis, characterization and evaluation of its photocatalytic activity towards degradation of rhodamine B dye in aqueous medium

Ag-Co₃O₄: Synthesis, characterization and evaluation of its photocatalytic activity towards degradation of rhodamine B dye in aqueous medium

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