Modified Clinoptilolite for the Removal of Rhodamine B Dye from Wastewater

Syed Fawad Ali Shah, Fatima Khitab, Shagufta Rasool, Rozina Khattak (), Tasmia (), Hajera Gul, Riaz Muhammad, Muhammad Sufaid Khan, Munaza Naseem and Zane Vincevica-Gaile ()
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Syed Fawad Ali Shah: Department of Chemistry, Sarhad University of Science and Information Technology, Peshawar 25000, Pakistan
Fatima Khitab: Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
Shagufta Rasool: Department of Chemistry, Sarhad University of Science and Information Technology, Peshawar 25000, Pakistan
Rozina Khattak: Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
Tasmia: Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
Hajera Gul: Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar 25000, Pakistan
Riaz Muhammad: Department of Chemistry, Sarhad University of Science and Information Technology, Peshawar 25000, Pakistan
Muhammad Sufaid Khan: Department of Chemistry, University of Chitral, Chitral 17200, Pakistan
Munaza Naseem: Department of Environmental Sciences, The Women University Multan, Multan 66000, Pakistan
Zane Vincevica-Gaile: Department of Environmental Science, University of Latvia, LV-1004 Riga, Latvia

Sustainability, 2024, vol. 16, issue 6, 1-19

Abstract: This study reveals the modification of the surface area of natural zeolite Clinoptilolite (CLN) by implementing the ion exchange method. The ammonium chloride cation exchange method was adopted and was followed by calcination at 450 °C for 5 h. This procedure helps to increase the surface area of CLN and also enhances its adsorption efficiency. The modifications of the CLN were confirmed by Fourier-transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) analysis. The efficiency and adsorption capacity of the modified CLN were determined by the adsorption of a Rhodamine B (Rh B) dye from an aqueous medium. The comparative analysis of the adsorption efficiency of raw CLN and the modified CLN revealed an enhanced adsorption of Rh B by the modified CLN at pH = 10. For desorption, different solvents were used. The results showed good desorption in ethanol and methanol, and poor desorption in acidic (HCl) and basic (NaOH) solutions. The kinetic study of the adsorption of Rh B by the modified CLN helped us to conclude that the adsorption follows a pseudo-second-order kinetics. For the surface study and to understand the mechanism of adsorption, several isotherm models were applied to the adsorption data at equilibrium. The data showed consistency with the Freundlich adsorption isotherm confirming that the process took place at its heterogeneous surface. The experimentally calculated adsorption capacity of the modified CLN was 2.81 mg g −1 , showing a comparable value to certain other common adsorbents. Therefore, the modified CLN may also be considered a cost-effective and promising adsorbent for the removal of Rh B dye from wastewater.

Keywords: natural zeolite Clinoptilolite; cation exchange process; adsorption; Rhodamine B (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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