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• W2893420637 abstract "A molecular theory has been applied to study the equilibrium conditions of glyphosate and aminomethylphosphonic acid (AMPA) adsorption from aqueous solutions to hydrogel films of cross-linked polyallylamine (PAH). This theoretical framework allows for describing the size, shape, state of charge/protonation, and configurational freedom of all chemical species in the system. Adsorption of glyphosate is a nonmonotonic function of the solution pH, which results from the protonation behavior of both the adsorbate and adsorbent material. Glyphosate and chloride ions compete for adsorption to neutralize the polymer charge; lowering the solution salt concentration enhances the partition of glyphosate inside the hydrogel film. AMPA adsorption is qualitatively similar to that of glyphosate but orders of magnitude smaller under the same conditions. AMPA is less charged than glyphosate, which unbalances the competition for adsorption with salt counter ions. In mixed solutions, glyphosate presence can significantly hinder AMPA adsorption. A higher pH establishes inside the film than in the bulk solution, which has important implications for the herbicide biodegradation because microbial activity is pH-dependent. Thus, PAH hydrogel films can be considered as functional materials that combine glyphosate sequestration and in situ degradation. In devising these materials, the polymer density is an important variable of design; polymer networks with high density of titratable units can enhance adsorption; this density can also be used to modify the pH inside the material." @default.
• W2893420637 created "2018-10-05" @default.
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• W2893420637 date "2018-09-24" @default.
• W2893420637 modified "2023-10-15" @default.
• W2893420637 title "Using Polymer Hydrogels for Glyphosate Sequestration from Aqueous Solutions: Molecular Theory Study of Adsorption to Polyallylamine Films" @default.
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• W2893420637 doi "https://doi.org/10.1021/acs.langmuir.8b02727" @default.
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• W2893420637 hasPublicationYear "2018" @default.
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