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

This study investigates phosphate removal from aqueous solution by syntheticmordenite and modified clinoptilolite zeolite. the mordenite zeolite was synthesizedusing the solvothermal method, and natural clinoptilolite zeolite was modified byultrasound energy and manganese dioxide. the adsorbents were characterized byutilizing x-ray diffraction (xrd), fourier transform infrared (ft-ir), scanningelectron microscope (sem) images, energy dispersive x-ray analysis (edxa), and thebrunauer-emmet-teller (bet) method. this study investigated the adsorption behaviorof the two adsorbents, including the influence of solid/liquid ratio, contact time, initialconcertation, and modification of the adsorption process, adsorption kinetics, andisotherms. the maximum phosphate adsorption capacity of the modified syntheticmordenite and the modified clinoptilolite are 23.06 and 17.9 mg.g^-1, respectively, whichis higher than the values reported in other studies. the present study shows that theamount of adsorption of modified synthetic mordenite for phosphate removal is higherthan the modified clinoptilolite zeolite. the kinetics study shows that the pseudosecond-order kinetic equation better describes the adsorbents' adsorption behavior.the isotherms study suggests that the adsorption process of synthetic mordenite andmodified clinoptilolite zeolite follow the langmuir and freundlich models, respectively.