期刊
REACTIVE & FUNCTIONAL POLYMERS
卷 121, 期 -, 页码 101-109出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.reactfunctpolym.2017.10.023
关键词
Adsorption; Organic-inorganic polymer; Isotherm; Kinetics; Thermodynamics
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [481669/2013-2, 305552/2013-9, 472670/2012-3]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [25/2014]
- Fundacao Araucaria do Parana
- Secretaria da Ciencia, Tecnologia e Ensino Superior do Parana (SETI)
- SANEPAR [013/2015]
- Laboratorio de Espectroscopia da Central de Multiusuario da PROPPG
- Institute Nacional de Ciencia e Tecnologia de Bioanalitica (INCT) [573672/2008-3]
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 g(-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 Delta H (-24.68 kJ mol(-1)) and the activation energy (12.21 kJ mol(-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.
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