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Ag@MnxOy: an effective catalyst for photo-degradation of rhodamine B dye

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Abstract

Water pollution by the textile industry is a major issue. Therefore, there is a need for methods to remove organic dyes from industrial effluents. Various metal oxides have been used as catalysts for the degradation of dyes. The catalytic efficiency of metal oxides can be enhanced by doping metal oxides with metals. Here we report the synthesis and characterization of nano-sized mixed valence manganese oxide (Mn x O y ) and silver-doped mixed valence manganese oxide (Ag@Mn x O y ). We study their photo-catalytic efficiency for the photo-degradation of the rhodamine B dye under light irradiation. Mn x O y was prepared using KMnO4, MnSO4 and NH3, and Ag@Mn x O y was prepared using AgNO3 and Calotropis gigantea plant extract. The prepared materials were characterized by X-ray diffractometry, scanning electron microscopy and Fourier transform infrared spectroscopy. Results show that doping with Ag enhanced the photo-catalytic performance of Mn x O y from 11 to 28% and 45 to 91% degradation of rhodamine B dye in 15 and 120 min, respectively. This enhancement is explained by the fact that Ag doping prevents the recombination of photoexcited electrons and positive holes, thus enhancing the photo-catalytic activity of Mn x O y .

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Acknowledgements

Financial support of The World Academy of Sciences (TWAS) under COMSTECH-TWAS Grants Program is highly acknowledged.

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Authors and Affiliations

  1. Department of Chemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan

    Muhammad Saeed, Atta ul Haq & Aisha Azhar

  2. National Center for Nanoscience and Technology, University of Chinese Academy of Sciences, Beiyitiao No. 11, Zhongguancun, Beijing, 100190, China

    Aziz Ahmad & Rajender Boddula

  3. Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Inamuddin

  4. Advanced Functional Materials Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh, 202002, India

    Inamuddin

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  1. Muhammad Saeed
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  2. Aziz Ahmad
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  5. Atta ul Haq
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Correspondence to Muhammad Saeed.

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Saeed, M., Ahmad, A., Boddula, R. et al. Ag@MnxOy: an effective catalyst for photo-degradation of rhodamine B dye. Environ Chem Lett 16, 287–294 (2018). https://doi.org/10.1007/s10311-017-0661-z

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  • DOI: https://doi.org/10.1007/s10311-017-0661-z

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