Study on the removal of diclofenac sodium from an aqueous medium using natural clinoptilolite zeolite modified with Hexadecyltrimethylammonium bromide cationic surfactant

Subject Areas :

Reza  Nodehi ¹ (M.Sc. in Chemical Engineering, Separation Process, Faculty of Chemical Engineer, Iran University Science & Technology, Tehran, Iran)
Ahmad  Rahbar-Kelishami ² (Ph.D. of Chemical Engineering, Separation Process, Faculty of Chemical Engineer, Iran University Science & Technology, Tehran, Iran)

Received: 2020-12-17 Accepted : 2020-12-17 Published : 2020-09-22

Keywords: zeolite, Adsorption, Surface modification, Diclofenac sodium removal,

Abstract :

Zeolites are crystalline and hydrated aluminosilicates from earth alkali and alkaline metals, which are used to the removal and separation of pharmaceutical pollutants due to their chemical structure and proper surface area. In the present study, first, natural zeolite was powdered by ball mill, and after that, it was modified by a cationic surfactant of the Hexadecyltrimethylammonium bromide. The modified zeolite was investigated by XRF, FTIR, SEM, BET, and XRD techniques. According to BET results, surface area, average pore diameter, and pore volume of the sample were 12 m2/g, 31.55 nm, and 0.094 cm3/g, respectively. Additionally, the efficiency of the sample was studied for removal of diclofenac from the aqueous medium. The results showed that environmental factors, such as adsorbent dose, contact time, pH, temperature, and diclofenac concentration were effective in removal percentage. In addition, the kinetic data were described better with pseudo-second-order kinetic model, also, the equilibrium data for adsorption of diclofenac were fitted well by Langmuir isotherm and the maximum adsorption capacity was 34.364 mg/g at 298 K approximately.

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