Kourosh Razmgar - Department of Chemical Engineering, Hakim Sabzevari University, Sabzevar, Iran
Zahra Beagom Mokhtari Hosseini

The pollution of water environments is a challenging issue especially indeveloping countries. Contamination of drinking water with heavy metals hasbeen reported in many parts of the world. Arsenic, chromium and lead aredangerous heavy metals and also common contaminants of drinking water. Inthis study, the capacity and performance of the surfactant -modified Sabzevarnatural nanozeolite (SMSNZ) on the removal of heavy metals from an aqueoussolution was investigated. Initially, the appropriate concentration ofhexadecyltrimethylammonium bromide HDTMA-Br solution for modificationwas investigated; it was found that it must be higher than the criticalconcentration micelle (CMC). Then, the removal of As (V), Cr (VI), and Pb(II)from an aqueous solution was studied using SMSNZ. The results indicated thatthe removal efficiency was very high in different initial concentrations of heavymetals. The Linear, Langmuir and Freundlich isotherm models were used toinvestigate the adsorption equilibrium of the surfactant-modified natural zeolitefor heavy metals adsorption. The results showed that the Linear isotherm is abetter fit for the three studied heavy metals.

Adsorption،Cationic surfactant،Heavy metal،Modification،Natural nanozeolite