In the present study, adsorbents of zeolite, peat and activated carbon were modified in two ways, one using cationic surfactant of Hexadecyltrimethylammonium Bromide (HDTMABr) and sodium hydroxide (NaOH), and the other using hydrochloric acid (HCl). Adsorbents characterized by X-ray diffraction, Fourier transform infrared spectroscopy and Brunauer–Emmett–Teller analysis. The modified adsorbents applied to remove salinity ions from irrigation saline water. Batch and column experimental were used to evaluate the adsorption capacity of salinity ions and the effect of contact time, concentration and adsorption effect on irrigation water quality parameters. Then, kinetics and adsorption isotherms were evaluated. The adsorption capacity of salinity ions by modified adsorbents in different electrical conductivity (EC) was between 11.4 mg/g to 212.2 mg/g. Between adsorbents, modified peat with HDTMABr and NaOH had the best effect in adsorption of salinity ions. The average reductions in electrical conductivity of 5.58, 10.41 and 20.4 dS/m for different absorbents were 1.2, 2. 5 and 4.8 dS/m, respectively. For all adsorbents the kinetic data described better by pseudo-second-order kinetic model than by the pseudo-first-order kinetic model, and isotherm data were fitted better by the Freundlich model than by the Langmuir model.
