Applied Chemical Engineering

Efficient adsorption of congo red dye from aqueous solution using MWCNT/Chitosan-g-Poly (acrylic acid–crotonic acid) composite

Khudhair M. Mahdi

Department of Chemistry, University of Sumer, College of Education, Thi-Qar, 64011, Iraq

Safaa Abdulkadhim Almansarawi

Department of Chemistry, University of Sumer, College of Education, Thi-Qar, 64011, Iraq

Layth S. Jasim

Department of Chemistry, College of Education, University of Al-Qadisiyah, Diwaniyah, 58002, Iraq

Maryam Batool

Department of Chemistry, University of Sahiwal, Sahiwal, 57000, Pakistan

DOI: https://doi.org/10.59429/ace.v8i3.5729

Keywords: Congo red (CR) dye; composite; adsorption; water

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Abstract

This research studies the synthesis and evaluation of a new composite material, MWCNT/Chitosan-g-Poly (acrylic acid–crotonic acid), designed for the efficient removal of congo red (CR) dye from water. The composite was created through a graft polymerization technique and characterized by FTIR, XRD, and FE-SEM. These analyses confirmed the successful integration of MWCNTs and presence of numerous functional groups for adsorption. To understand the composite's performance, a series of batch experiments were performed to investigate the impact of contact time, pH, adsorbent dose, and initial dye concentration. Study was best described by pseudo-second model and Langmuir model (with maximum adsorption capacity of 14.13 mg g⁻¹) was the best fit for the equilibrium data and process was thermally spontaneous and exothermic. Overall, the synthesized material showed good adsorption potential for dye removal from water.

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