Synthesis of Nano and Micro-Organobentonite Using Hexadecyltrimethylammonium Bromide and Evaluation of Their Absorption Efficiency and Release of Nitrate in Aqueous Solution

Fariba Nemati Shamsabad | Hossein Torabi Golsefidi | Amirmohammad Naji

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=53969
Date :  2017/08/21
Publish in :    تحقيقات اب و خاک ايران- علوم کشاورزي ايران سابق


Keywords :Synthesis, Evaluation, Absorption

Abstract :

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Organocalys are natural clay minerals which modified by polymer compounds and applying for especial purposes. By doing so, the clay layers are permanently propped and high surface area in the interlayers. The objective of this study was absorption efficiency and release of nitrate in aqueous solutions by modified Iranian bentonite (Arak). The micro and nano-bentonite was first modified by hexadecyltrimethylammonium bromide, a cationic surfactant. In this study, adsorption efficiency in 0, 3, 6, 9, 14, 20, 30 and 40 mM nitrate by modified micro and nano-organobentonite particles in surfactant loading of 100 and 200 CEC was investigated in a completely randomized factorial design. Furthermore, in order to identity the stability of adsorbed nitrate by modified bentonite, the nitrate desorption process was performed at nitrate concentration of 6 and 20 mM in 15, 30, 45 minutes and 1, 2, 8 and 16 hours in a completely randomized factorial design. The results showed that absorption efficiency of nitrate by nano-organobentonite with surfactant loading of 200 CEC in 3, 6, 9, 14, 20, 30 and 40 mM nitrate were 96, 94, 91, 90, 84, 76 and 68, whereas in mico-organobentonite were 87, 92, 89, 86, 74, 80 and 68 respectively. The results showed that concentration of surfactant was significant on adsorption and release of nitrate (p≤0.01), but the particle sizes was not significant (p≤0.01). Nano-bentonite in 200 CEC of HDTMA and low concentration of nitrate have a highest adsorption efficiency (96) with minimum release (3.7).