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Detection and removal of Congo red via aniline-based polymer and polymer composite

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Abstract

Nowadays due to growth in industrialization, hazardous coloured effluents are released in water which affects flora and fauna as well as human life. Due to the scarcity of fresh water on the earth, a lot of scientific approaches were being applied for investigating and removal of these coloured effluents from wastewater. Amongst them, electrochemical sensing and adsorption of such dyes using conducting polymers are the emerging field nowadays. In this regard, a conducting polymer i.e. polyaniline and its composite with graphene oxide were synthesized via an in-situ chemical oxidative method. The electrochemical sensing reveals that polymer composite has high sensitivity towards Congo red as compared to prestige polyaniline. Maximum drop in peak current was noticed for polymer composite i.e. 1.43 mA from 1.98 mA i.e. attributed to a porous surface and maximum active surface area i.e. 3.46E−3 cm2. The adsorption and sensing of Congo red on polyaniline-graphene oxide follow pseudo-second-order kinetics. The charge transfer resistance for composite first increases and then decreases with an increase in dye dosage i.e. due to the redox property of Congo red. The interaction between dye and polymer surface is physical. From the concentration-effect, it has been concluded that adsorption of CR on polyaniline-graphene oxide composite follows the Freundlich isotherm model which indicates the physio-sorption of Congo red i.e. also confirmed by the \(\Delta H\) in the range of 5–80 kJ/mol.

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Acknowledgements

Institute of Chemical Science, University of Peshawar and National Centre of Excellence in Physical Chemistry, University of Peshawar are gratefully acknowledged for financial support.

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Authors and Affiliations

  1. Polymer Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan

    Syed Faizan,  Bakhtawara & Fatima Zaid

  2. Physical Chemistry Laboratory, Institute of Chemical Science, University of Peshawar, Peshawar, 25120, Pakistan

    Syed Faizan

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  1. Syed Faizan
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Faizan, S., Bakhtawara & Zaid, F. Detection and removal of Congo red via aniline-based polymer and polymer composite. Polym. Bull. 80, 7971–7989 (2023). https://doi.org/10.1007/s00289-022-04432-7

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  • DOI: https://doi.org/10.1007/s00289-022-04432-7

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