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image of Methylene Blue Cationic Dyes Adsorptively Removed Using Polyaniline Doped with Tannic Acid

Abstract

Introduction

This paper describes the adsorption efficiency of tannic acid-doped polyaniline (TPAni) to remove methylene blue (Mb) dye from its water-based solution. Ammonium persulfate (APS) was used as an oxidant in the polymerization process to prepare TPAni. Tannic acid-doped polyaniline was characterized using FTIR, FE-SEM, TEM, BET, and ZETA potential conductivity techniques.

Methods

The Langmuir capacity isotherm was found to be 42.3 mg/g. Additionally, the effects of temperature, pH, contact time, and initial concentration of Mb were examined and optimized to 35°C, 8.50 minutes, 8 mg/L, respectively.

Results

Temperature affects the Gibbs free energy, which is -3.356, -3.562, and -3.615 kJ/mol at 290, 300, and 305 K, respectively.

Discussion

This shift in Gibbs's free energy implies that tannic acid-doped polyaniline has the ability to spontaneously and practically remove methylene blue dye. The measured change in enthalpy of 1.13 kJ/mol indicated the presence of physical contact between the adsorbent and the dye molecules.

Conclusion

It can be concluded from this study that the heterogeneous surface of TPAni was involved in the adsorptive elimination of the Mb and that a multilayer formed during the adsorption experiment. The study also examined the impacts of several parameters: contact time, initial dye concentration, adsorbent dose, and pH of the solution. The optimum values of these parameters were found to be 50 minutes, 8 mgL−1, 0.004 g, and 8, respectively. The effect of temperature was also investigated, and found that higher adsorption occurs at high temperature. It is clear from this study that tannic acid-doped polyaniline (TPAni) with a greater number of negative sites on its surface is a very useful and new adsorbent for removing cationic dyes from wastewater.

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2025-12-18
2026-05-13

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Methylene Blue Cationic Dyes Adsorptively Removed Using Polyaniline Doped with Tannic Acid
Bentham Science Publishers ; https://doi.org/10.2174/0118779468427589251130202313
/content/journals/cpc/10.2174/0118779468427589251130202313
/content/journals/cpc/10.2174/0118779468427589251130202313
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  • Article Type:     Research Article
Keywords: Tannic acid ; methylene blue ; polyaniline ; kinetics ; and isotherm ; adsorption

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