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Emergence of bismuth substituted cobalt ferrite nanostructures as versatile candidates for the enhanced oxidative degradation of hazardous organic dyes.

Abstract

Bismuth, a post transition metal element, has enticed a greater attention to be incorporated into the ferrite sub-lattice for tuning different physical and chemical characteristics, thereby drastically affecting the catalytic performance. The present investigation focuses on the substitution of bismuth into the lattice of cobalt ferrite to be explored as efficient catalysts for the oxidative degradation of hazardous organic dyes, both in the presence and absence of visible light irradiation. A series of bismuth doped cobalt ferrite nanostructures (CoBixFe2-xO4, x = 0.02, 0.04, 0.06, 0.08, 0.1) were fabricated by facile sol-gel methodology. The amount of bismuth doped into the cobalt ferrite lattice played an important role in determining the rate of degradation reaction. The drastic enhancement in the catalytic efficacy was observed via incorporation of just 1% bismuth (x = 0.02) replacing iron in the cobalt ferrite lattice due to its octahedral site preference. With further increase in bismuth content up to 3% (x = 0.04 and 0.06) displayed slight improvement whereas beyond x = 0.06 devastation in catalytic behavior was observed that could be attributed to the mixed tetrahedral and octahedral site occupancy for the former, and catalytically inactive tetrahedral site occupancy of bismuth ions for the latter. Therefore, CoBi0.02Fe1.98O4 possessed the best catalytic performance out of all bismuth incorporated samples. The observed catalytic efficacy trend of bismuth doped cobalt ferrite could be related to the physical characteristics such crystallite size, saturation magnetization and band gap. Additionally, very good recyclability of the synthesized samples highlighted their applicability as potential recyclable catalysts for the remediation of hazardous dyes.

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Publication details

The article was received on 27 Feb 2018, accepted on 01 Aug 2018 and first published on 01 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ00977E
Citation: New J. Chem., 2018, Accepted Manuscript
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    Emergence of bismuth substituted cobalt ferrite nanostructures as versatile candidates for the enhanced oxidative degradation of hazardous organic dyes.

    S. Kapoor, A. Goyal, S. Bansal and S. Singhal, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00977E

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