Silica-Based NTPC-Fly Ash for Dye-Removal Application and Effect of Its Modification

Authors

  • Babitha K. Babu,

    1. Nano-Ceramics Section, Materials and Minerals Division (MMD), National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Thiruvananthapuram, Kerala, India
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  • Jeena Vadakke Purayil,

    1. Nano-Ceramics Section, Materials and Minerals Division (MMD), National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Thiruvananthapuram, Kerala, India
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  • Hareesh Padinhattayil,

    1. Nano-Ceramics Section, Materials and Minerals Division (MMD), National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Thiruvananthapuram, Kerala, India
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  • Satyajit Shukla,

    Corresponding author
    • Nano-Ceramics Section, Materials and Minerals Division (MMD), National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Thiruvananthapuram, Kerala, India
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  • Krishna Gopakumar Warrier

    1. Nano-Ceramics Section, Materials and Minerals Division (MMD), National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Thiruvananthapuram, Kerala, India
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satyajit_shukla@niist.res.in

Abstract

Silica-based fly ash (FA) received from the National Thermal Power Corporation (NTPC), India has been utilized for determining its dye-adsorption capacity. The dye adsorption using the NTPC-FA has been examined by varying the initial methylene blue dye concentration (7.5–150 μM) and initial solution-pH (2.5–11.5). The dye-adsorption capacity of NTPC-FA has been found to be 0.43 mg/g. To increase the dye-adsorption capacity, the NTPC-FA is subjected to the hydrothermal treatment and typical washing cycles without and with the coating of sol–gel derived anatase-titania. The hydrothermally treated NTPC-FA and hydrogen titanate–silica composite thus obtained exhibit dye-adsorption capacity higher than that of NTPC-FA.

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