Investigation of phosphate adsorption from aqueous media using synthetic mordenite and modified natural clinoptilolite zeolite adsorbents: characteristics, kinetics, and isotherms

Document Type : Research Paper

Authors

Research Laboratory of Nanoporous Materials, Department of Chemistry, Iran University of Science and Technology, Tehran, Iran

Abstract

This study investigates phosphate removal from aqueous solution by synthetic mordenite and modified clinoptilolite zeolite. The mordenite zeolite was synthesized using the solvothermal method, and natural clinoptilolite zeolite was modified by ultrasound energy and manganese dioxide. The adsorbents were characterized by utilizing X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Scanning electron microscope (SEM) images, energy dispersive X-ray analysis (EDXA), and the Brunauer-Emmet-Teller (BET) method. This study investigated the adsorption behavior of the two adsorbents, including the influence of solid/liquid ratio, contact time, initial concertation, and modification of the adsorption process, adsorption kinetics, and isotherms. The maximum phosphate adsorption capacity of the modified synthetic mordenite and the modified clinoptilolite are 23.06 and 17.9 mg.g-1, respectively, which is higher than the values reported in other studies. The present study shows that the amount of adsorption of modified synthetic mordenite for phosphate removal is higher than the modified clinoptilolite zeolite. The kinetics study shows that the pseudo-second-order kinetic equation better describes the adsorbents' adsorption behavior. The isotherms study suggests that the adsorption process of synthetic mordenite and modified clinoptilolite zeolite follow the Langmuir and Freundlich models, respectively.

Graphical Abstract

Investigation of phosphate adsorption from aqueous media using synthetic mordenite and modified natural clinoptilolite zeolite adsorbents: characteristics, kinetics, and isotherms

Highlights

  • Removal of phosphate from aqueous solution by synthetic mordenite and modified clinoptilolite zeolite has been investigated.
  • The maximum adsorption capacities by synthetic mordenite and modified clinoptilolite zeolite were 23.06 and 17.9 mg.g-1 for phosphate ions.
  • The results confirm the efficiency of adsorbents for reduction of phosphate from aqueous solution.
  • The results of the present study indicate that sorption capacity of mordenite is higher than MnO2-clino.

Keywords


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Volume 7, Issue 2
October 2021
Pages 119-130
  • Receive Date: 01 September 2021
  • Revise Date: 03 June 2022
  • Accept Date: 08 June 2022
  • First Publish Date: 08 June 2022