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Removal of Congo Red from Aqueous Solutions by Spent Black Tea as Adsorbent

  • Physical Chemistry of Water Treatment Processes
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Abstract

Herein we present spent black tea as an adsorbent for the removal of Congo red dye from aqueous solutions. The effects of various parameters such as pH, time, temperature, adsorbent dosage and adsorbate dosage on dye adsorption were investigated. Batch experiments were conducted using different amount of adsorbent material (2.5–1000 mg) at varying amounts of adsorbate (5–500 mg/L) at 35°C and different pH (1–13). A maximum dye removal of >80% was achieved with an adsorbent dose of 100 mg, adsorbate concentration of 5 mg/L under pH range of 6 within 5 min at room temperature. The experimental data were modeled by Langmuir, Freundlich and Temkin isotherms and conforms to both Langmuir and Freundlich isotherms but not to Temkin isotherm. The proposed spent black tea can be effectively used as a low cost adsorbent for the removal of Congo red dye.

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Authors and Affiliations

  1. Department of Environmental Sciences, COMSATS Institute of Information Technology (CIIT), Abbottabad, Pakistan

    Rabia Jalil Khan, Romana Khan & Maria Siddique

  2. Department of Energy and Environmental Engineering, Korea University of Science and Technology, Daejeon, Korea

    Ahmad Nauman Shah Saqib

  3. Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Seoul, Korea

    Ahmad Nauman Shah Saqib

  4. Department of Chemical Engineering, COMSATS Institute of Information Technology, Lahore, Pakistan

    Robina Farooq

Authors
  1. Rabia Jalil Khan
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  2. Ahmad Nauman Shah Saqib
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  3. Robina Farooq
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  4. Romana Khan
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  5. Maria Siddique
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Corresponding author

Correspondence to Maria Siddique.

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The text was submitted by the authors in English.

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Khan, R.J., Saqib, A.N.S., Farooq, R. et al. Removal of Congo Red from Aqueous Solutions by Spent Black Tea as Adsorbent. J. Water Chem. Technol. 40, 206–212 (2018). https://doi.org/10.3103/S1063455X18040057

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  • DOI: https://doi.org/10.3103/S1063455X18040057

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