Enhanced adsorption of congo red using cationic surfactant functionalized zeolite particles

• Published in: Microchemical journal Vol. 153; p. 104281
• Main Authors: Nodehi, Reza, Shayesteh, Hadi, Kelishami, Ahmad Rahbar
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2020
• Subjects: Adsorption; Clinoptilolite; Congo red; HDTMA modification; Clinoptilolite; Congo red; Adsorption; HDTMA modification
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2019.104281

•Natural and cationic surfactant modified clinoptilolite have been used for the removal of CR.•Enhanced adsorption of congo red using cationic surfactant functionalized zeolite particles.•Adsorption kinetic, isotherm, and thermodynamic were studied in detail.•SMC exhibited high adsorption capacity for the CR irons. In the present work, natural and modified clinoptilolite by cationic surfactant used for congo red removal. Adsorption kinetic models showed that pseudo-second-order by R2 > 0.99 for both adsorbents were well adapted. Congo red maximum adsorption capacities can attain 16.92 and 200 mg/g for natural and cationic surfactant modified clinoptilolite of the Langmuir isotherm, respectively. The enthalpy change (ΔHo) in the adsorption process are −39.94 and −14.39 kJ/mol , showing the adsorption is an exothermic reaction. ΔS∘ < 0 shows that system confusion degree decreases and the order degree increases. The values of ΔG∘ for adsorption of CR onto NC and SMC ranges from 6242 to 9329 kJ/mol and −3553 to −2821 kJ/mol, respectively. The obtained results proved that cationic surfactant modified clinoptilolite powder can be applied effectively for removal of CR as natural adsorbent.