Comparison of Absorption Efficiency and Release of Nitrate by Iranian and Foreign Micro-Zeolite (Clinoptilolite), Modified by Hexa-Decyltrimethy- Ammonium

Subject Areas : Environmental pollutions (water, soil and air)

Fariba Nemati ¹ , Hossein Torabi Golsefidi ² , Amir Mohammad Naji ³

1 - M.Sc. Graduated, Dept. of Soil Science, Shahed University, Tehran, Iran.
2 - Assistant Prof., Dept. of Soil Science, Shahed University, Tehran, Iran, *(Corresponding Author)
3 - Assistant Prof., Dept. of Plant Breeding and Biotechnology, Shahed University, Tehran, Iran

Received: 2017-01-14 Accepted : 2019-01-20 Published : 2021-03-21

Keywords: External Cation exchange Capacity of Zeolite, Clay, Organ Zeolite,

Abstract :

Background and objective: Organocalys are modified by cationic surfactant on surface and between layers of natural or synthesis clays and widely are used. The objective of this study were comparison of absorption efficiency and release of nitrate in aqueous solutions by modified Iranian natural zeolite-clinoptilolite (Semnan) and synthesis zeolite of Fluka-96096.Material and Methods: The Iranian and Fluka-96096 micro-zeolite (clinoptilolite) was separated by centrifuge method. The micro-zeolites were first modified by hexa-decyltrimethyl-ammonium (HDTMA), a cationic surfactant. Structure and morphology of zeolites were determined XRD, SEM, EDX and AFM. In this study, adsorption efficiency in initial concentrations of nitrate by modified zeolite with surfactant loading of 100 and 200% external cation exchange capacity (ECEC) was investigated in a completely randomized factorial design. The nitrate release as affected by time at 4 and 14 mM of nitrate in surfactant loading 200% ECEC were also evaluated.Results: The results showed that absorption efficiency of nitrate by Fluka micro-organozeolite with surfactant loading of 200% ECEC in 3, 6, 20 and 30 mM nitrate were 77, 63, 48, 37 and 30% respectively, whereas, by Iranian micro-organ zeolite were 75, 67, 54, 50 and 33% respectively and no significant together (p≤0.01). The mean of nitrate release were 31 to 21%, in Iranian micro-organ zeolite, whereas for Fluka micro-organ zeolite were 17 to 34%.Discussion and Conclusion: The adsorption efficiency of nitrate was significant by initial nitrate concentration and surfactant’s level. The best adsorption efficiency of nitrate occurred at 200% of ECEC. The results of this research showed that the micro-organ zeolite of Fluka-96096 not only is not better than Iranian micro-zeolite, but also, Iranian micro-organ zeolite have been better for nitrate absorption and release in some cases.

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