کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
73252 49052 2013 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polyaniline and its composites with zeolite ZSM-5 for efficient removal of glyphosate from aqueous solution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Polyaniline and its composites with zeolite ZSM-5 for efficient removal of glyphosate from aqueous solution
چکیده انگلیسی


• Nanostructured and granular polyaniline/ZSM-5 composites were synthesized.
• PANI, ZSM-5 and their composites were evaluated as adsorbents for glyphosate.
• The highest adsorption of glyphosate exhibited the deprotonated granular PANI.
• High adsorption capacity shows also the deprotonated PANI/(50 wt.%) ZSM-5 composite.

Nanostructured and granular polyanilines (PANIs) and their composites with zeolite ZSM-5, synthesized by the oxidative polymerization of aniline in water and aqueous solution of sulfuric acid, are evaluated as adsorbents of the organic herbicide glyphosate [N-(phosphonomethyl)glycine] in aqueous solution. The protonated and deprotonated forms of synthesized materials were characterized by elemental and thermogravimetric analysis, scanning electron microscopy, FTIR, Raman and UV–Vis spectroscopies, X-ray powder diffraction, and nitrogen physisorption measurements. The adsorption isotherms of glyphosate on studied materials were best fitted by Freundlich and Langmuir–Freundlich models. The adsorption characteristics of the investigated PANIs and PANI/ZSM-5 composites were found to be much more influenced by the oxidation state and protonation level of PANI in the adsorbents then by the textural and morphological properties of materials. The highest adsorption of glyphosate among all investigated PANI and PANI/ZSM-5 samples, as well as pure ZSM-5, exhibited the deprotonated granular PANI which was synthesized in sulfuric acid medium (98.5 mg/g). High adsorption capacity also showed the deprotonated PANI/ZSM-5 composite with ∼50% of zeolite (61.9 mg/g) and the protonated nanostructured PANI (59.9 mg/g), both materials prepared in water without added acid.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 180, 1 November 2013, Pages 141–155
نویسندگان
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