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عنوان:

استفاده از نانو کامپوزیت های الکترواکتیو بر پایه پلی پیرول و پلی آنیلین برای جذب رنگینه های آلی از محلول های آبی



گروه تخصصی:  علوم پایه

سازمان مجری:  معاونت آموزشی جهاددانشگاهی (پایان نامه ها) 

گروه پژوهشی: 

پژوهشگران: 
آقایی حسین (استاد راهنما)
زارع کریم (استاد راهنما)
انصاری خلخالی رضا (استاد مشاور)
منعمی مجید (استاد مشاور)
بنی مهدکیوانی محمد (پژوهشگر)

تاریخ خاتمه:  1388

کارفرما: معاونت آموزشی جهاددانشگاهی

خروجی طرح: 
نوع: پایان نامه

 
تلفن: 

نشانی سازمان مجری: 
 

چکیده:

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پلی آنیلین,پلی پیرول,نانوپلیمرهای هادی,نایلون 6,نایلون 66,نانوکامپوزیت پلی آنیلین/ خاک اره,نانو کامپوزیت پلی پیرول/ خاک اره,حذف رنگینه های آلی

 
 
Title:

Application of nano electroactive composites based on polypyrrole and polyaniline for adsorption of organic dyes from aqueous solutions



Abstract:

Polyaniline (Pan) and polypyrrole (as shown below) are considered two of the most important electrically conductive and electroactive polymers due to their high conductivity (1-100 S/cm), and environmental stabilities. Furthermore, because of processability of polyaniline in some solvents this polymer can be prepared in the form of membrane or pure thin film as coated on different solid substrates and composites with other common polymers. The other advantages such as lower cost of the monomer, interesting redox behaviour, feasibility of the synthesis, insolubility in common solvents and higher intrinsic environmental and thermal stability has made polyaniline more popular in comparison to polypyrrole. Polypyrrole Polyaniline In this project, polyaniline was synthesized chemically using chemical oxidants such as (NH4)2S2O8 in acidic media (HCl). Composites of polyaniline with classic polymers (nylon 66 and Nylon 6) which are insulator and synthetic polyamides were then prepared. Composites of polyaniline (as a conducting polyamine polymer) can be easily prepared with nylons as synthetic polyamides via solvent (formic acid) cast method. The resulted polymers or polymer composites were characterized using mechanical test (Tensile strength), thermal stability (employing UV-Vis spectroscopy) and conductivity measurement using standard method of 4-Point Probe technique. Nancomposite of polyaniline sawdust (termed as (pan/SD) and nanocomposite of polypyrrole sawdust (termed as Ppy/SD) were prepared in this research and their capabilities for removing of some organic dyes were examined. FeCl3 was used as the chemical oxidant for preparing Ppy/SD composite. Three frequently used organic dyes in textile industries: methylene blue (MB), Rodamine B (RB) and green Malachite (MG) were studied in this investigation as test probe. Removal of the dyes from textile wastewaters is important due to their harms on the environment. It was found that different factors such as pH, sorbent dosage and the initial concentration of the dye affect the amount of dye sorption by the employed adsorbents. Each dye showed a specific pH for its maximum adsorption by the adsorbents used in this study. The best conditions for maximum adsorption were then optimized for each system. Adsorption of the dyes by the polymers coated onto sawdust can be mainly due to the strong electrostatic interactions between the polymer adsorbent and the dyes. Because of the electroactive nature of the polymers some other mechanism such as redox reactions might be possible too. Treatment of the adsorption data were also carried out using Langmuir and Fruendlich isotherms. The results obtained show that the currently introduced adsorbents can be used for adsorption or removing of organic dyes from industrial wastewaters successfully.



Keyword(s): polyaniline, polypyrrole, nano conductive polymers, nylon 6, nylon 66, nano polyaniline/sawdust composite, nano polypyrrole/sawdust composite, dye removal