Studying the effect of different modifiers on clinoptilolite zeolite to improve the surface adsorption of cationic and anionic dyes

Water wastes are one of the important problems in small and large industries today. It is very important to find a cost-effective adsorbent and develop a simple modification method to improve its effectiveness in removing environmental pollutants [۱]. Among the various techniques for industrial wastewater treatment, surface adsorption stands out as a very efficient method for color removal. Natural zeolites are a suitable, economical, and easily available option for adsorbing dye and pigments from wastewater [۲]. This study was conducted to evaluate the efficiency of zeolite in removing cationic and anionic dyes. The characteristics of the used zeolite were analyzed using X-ray diffraction (XRD), which showed SiO۲ and Al۲O۳ as the main constituents of the used zeolite [۳]. This research investigated the effect of zeolite mesh size (۸, ۱۰, ۱۸, ۲۰, ۴۰, ۶۰, ۸۰, and ۱۲۰) on the surface adsorption efficiency of dyes and the effect of different acids (sulfuric acid, hydrochloric acid, and phosphoric acid) on increasing the adsorption performance of zeolite. The findings showed that reducing the size of zeolite and modifying it with phosphoric acid leads to improved adsorption efficiency. Notably, phosphoric acid-modified zeolite with mesh size ۱۲۰ showed the highest dye removal efficiency, obtaining ۶۹% for methylene blue and ۹۵% for methyl orange after one hour of contact.

کلیدواژه ها:

Modified Zeolite ، Surface Adsorption ، Dyes Effluents ، Aluminosilicates ، Methylene Blue