Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7826568 | Reactive and Functional Polymers | 2017 | 9 Pages |
Abstract
In the present study a newly designed hybrid polymer based on poly(methacrylic acid)/SiO2/Al2O3 synthesized by combination of random free-radical polymerization followed by sol-gel process was evaluated for imazethapyr herbicide adsorption from aqueous medium. The adsorbent material has been characterized by FT-IR, SEM, TGA and X-ray diffraction. The adsorption kinetic properties were obtained by application of kinetic models (pseudo-first order, pseudo-second order and intraparticle diffusion). Although the fit models to experimental data were similar each others, the pseudo-second provided a slight best fit for herbicide adsorption onto hybrid polymer. From binding isotherm adsorption, the dual-site Langmuir-Freundlich model showed the best fit and maximum adsorption capacity of 4.50 mg gâ 1. Thermodynamic parameters seem to indicate that adsorption of herbicide by hybrid material is exothermic, with decreasing in the disorder of the system and spontaneous. From the magnitude of ÎH (â 24.68 kJ molâ 1) and the activation energy (12.21 kJ molâ 1), it can be infer that adsorption of imazethapyr by hybrid polymer if of physical nature. From the achieved results, the poly(methacrylic acid)/SiO2/Al2O3 material showed good adsorptive characteristic for imazethapyr and this strategy open a convenient approach for preparation of new hybrid adsorbent materials in the field of separation science.
Related Topics
Physical Sciences and Engineering
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Authors
Juliana Casarin, Affonso Celso Jr, Mariana Gava Segatelli, César Ricardo Teixeira Tarley,