Removal of herbicides from aqueous solutions by modified forms of montmorillonite

Park, Yuri, Sun, Zhiming, Ayoko, Godwin A., & Frost, Ray L. (2014) Removal of herbicides from aqueous solutions by modified forms of montmorillonite. Journal of Colloid and Interface Science, 415, pp. 127-132.

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This investigation for the removal of agricultural pollutants, imazaquin and atrazine was conducted using montmorillonite (MMT) exchanged with organic cations through ion exchange. The study found that the adsorption of the herbicides was affected by the degree of organic cation saturations, the size of organic cations and the different natures of the herbicides. The modified clays intercalated with the larger surfactant molecules at the higher concentrations tended to enhance the adsorption of imazaquin and atrazine. In particular, the organoclays were highly efficient for the removal of imazaquin while the adsorption of atrazine was minimal due to the different hydrophobicities. Both imazaquin and atrazine were influenced by the changes of pH. The amphoteric imazaquin exists as an anion at the pH 5–7 and the anionic imazaquin was protonated to a neutral and further a cationic form when the pH is lower. The weak base, atrazine was also protonated at lower pH values. The anionic imazaquin had a strong affinity to the organoclays on the external surface as well as in the interlayer space of the MMT through electrostatic and hydrophobic interactions. In this study, the electrostatic interaction can be the primary mechanism involved during the adsorption process. This study also investigated a comparative adsorption for the imazaquin and atrazine and the lower adsorption of atrazine was enhanced and this phenomenon was due to the synergetic effect. This work highlights a potential mechanism for the removal of specific persistence herbicides from the environment.

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9 citations in Web of Science®

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ID Code: 83639
Item Type: Journal Article
Refereed: Yes
Keywords: adsorption, atrazine, imazaquin, water purification, comparative adsorption
DOI: 10.1016/j.jcis.2013.10.024
ISSN: 0021-9797
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier
Deposited On: 16 Apr 2015 05:48
Last Modified: 16 Apr 2015 05:48

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