ELECTROCHEMICAL SYNTHESIS OF POLYANILINE FOR ENHANCED CONGO RED REMOVAL

Dawei Zheng (), Tong Guo (), Weixiao Chang (), Dezhong Yu and Dong Liu
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Dawei Zheng: School of Chemistry and Environmental Engineering, Hubei Key Laboratory of Novel Reactor and Green Chemistry Technology, Wuhan Institute of Technology, Wuhan 430205, P. R. China
Tong Guo: School of Chemistry and Environmental Engineering, Hubei Key Laboratory of Novel Reactor and Green Chemistry Technology, Wuhan Institute of Technology, Wuhan 430205, P. R. China
Weixiao Chang: School of Chemistry and Environmental Engineering, Hubei Key Laboratory of Novel Reactor and Green Chemistry Technology, Wuhan Institute of Technology, Wuhan 430205, P. R. China
Dezhong Yu: School of Chemistry and Environmental Engineering, Hubei Key Laboratory of Novel Reactor and Green Chemistry Technology, Wuhan Institute of Technology, Wuhan 430205, P. R. China†Key Laboratory for Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, P. R. China
Dong Liu: School of Chemistry and Environmental Engineering, Hubei Key Laboratory of Novel Reactor and Green Chemistry Technology, Wuhan Institute of Technology, Wuhan 430205, P. R. China†Key Laboratory for Green Chemical Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, P. R. China

Surface Review and Letters (SRL), 2025, vol. 32, issue 10, 1-13

Abstract: This study aimed to investigate the synthesis of polyaniline (PANI) through electrochemical cyclic voltammetry at varying pH levels and its subsequent adsorption behavior towards Congo red. The products were analyzed using Fourier Transform-infrared spectroscopy (FTIR) and Scanning Electron Microscope (SEM). Results showed that acidic conditions led to faster synthesis rates and complete planes with intercalated flakes, while neutral and alkaline conditions resulted in mostly granular aggregates. PANI synthesized with the maximum adsorption capacity is 58.07mg/g. The interaction between PANI and Congo red occurred through protonation-induced positive charges and electrostatic attraction, as indicated by UV–Vis spectroscopy results. The adsorption process followed the Langmuir model and pseudo-second-order kinetic process, indicating a chemical adsorption process. This study emphasizes the significance of pH conditions in polyaniline synthesis and its potential application in dye removal processes.

Keywords: Polyaniline; cyclic voltammetry; adsorption; Congo red (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1142/S0218625X24501312

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