Sorption of acid dye by surfactant modificated natural zeolites

• A local natural zeolite (NZ) and its surfactant-modified form (SMNZ) were used for the sorption of Acid Red 18.
• The isotherm data were well described by the Langmuir isotherm model.
• The sorption process followed pseudo-second order kinetic model.
• The capacities of SMNZ and NZ for the sorption of AR18 were found to be 20.42 and 1.17 mg/g, respectively.

The adsorption of Acid Red 18 (AR18) by a natural zeolite (NZ) and its surfactant modified form (SMNZ) was investigated. The effects of initial dye concentration, contact time and adsorbent dose on the removal of AR18 were examined. Sorption kinetic was evaluated using the pseudo-second order, Elovich and Lagergren's first-order models. The equilibrium was analyzed by Freundlich, Langmuir, and Dubinin–Radushkevich models. The pseudo-second order kinetic model was found to agree well with the experimental data. The Langmuir isotherm was found to best represent the sorption data. The capacities of SMNZ and NZ for AR18 were found 20.42 and 1.17 mg/g, respectively. SMNZ could be a useful sorbent for the removal of AR18 from aqueous solutions.

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