سنتز موضعی کامپوزیت کیتوزان-پلی‌آکریل آمید بارگذاری شده با نانوذرات دی اکسید تیتانیم برای جذب رنگ زرد سیریوس از محیط آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه مهندسی شیمی، واحد قائمشهر، دانشگاه آزاد اسلامی، قائمشهر، ایران

2 دانشجوی دکترای مهندسی شیمی، گروه مهندسی شیمی، واحد آیت الله آملی، دانشگاه آزاد اسلامی، آمل، ایران

3 استادیار، گروه مهندسی نساجی، واحد قائمشهر، دانشگاه آزاد اسلامی، قائمشهر، ایران

4 استادیار، گروه مهندسی شیمی، دانشکده فنی امام محمد باقر، ساری، ایران

چکیده

تخلیه پساب‌های رنگی و غیررنگی صنایع مختلف مانند نساجی، کاغذسازی، آرایشی و بهداشتی، کشاورزی، پلاستیک و چرم، معضلات محیط ‌زیستی شدیدی را به‌وجود می‌آورد. بسیاری از ترکیبات رنگی به‌علت ترکیب پیچیده آروماتیک و انحلال زیاد در آب، سمی، سرطان‌زا و زیست‌تخریب ناپذیرند و حذف آنها از پساب اهمیت زیادی دارد. در این پژوهش، کامپوزیت کیتوزان- پلی‌آکریل‌آمید بارگذاری شده با  TiO2 (Ch-PAA-TiO2) سنتز شد و به‌عنوان جاذب برای حذف رنگزای آنیونی زرد سیریوسK-CF از محلول آبی مورد استفاده قرار گرفت. مشخصات جاذب سنتز شده با استفاده از آنالیز‌های XRD، TEM، FT-IR و FE-SEM ارزیابی شد. تأثیر پارامترهایی مانند pH، مقدار جاذب و زمان تماس بر راندمان حذف رنگ بررسی شد. پارامتر‌های بهینه در این پژوهش شامل pH برابر 2، مقدار جاذب 50 میلی‌گرم، دمای 40 درجه سلسیوس و زمان تماس 90 دقیقه بودند. نتایج بررسی ترمودینامیکی نشان داد که فرایند جذب، گرماگیر، امکان‌پذیر و خودبه‌خودی است. همدماهای جذب نیز بررسی شدند که همدمای لانگمیر بهترین تطابق را با داده‌های تعادلی نشان داد و به‌عنوان همدمای غالب در نظر گرفته شد. حداکثر ظرفیت جذب، 86/142 میلی‌گرم بر گرم محاسبه شد. به‌منظور بررسی اثر دما بر میزان جذب، ظرفیت و سرعت جذب، سینتیک جذب نیز بررسی شد و نتایج حاصل از داده‌های آزمایشگاهی، نشان داد که این فرایند از مدل سینتیکی شبه مرتبه دو تبعیت می‌کند. در این پژوهش مشخص شد که کامپوزیت کیتوزان- پلی‌آکریل‌آمید بارگذاری شده با  TiO2(Ch-PAA-TiO2) ظرفیت جذب زیادی در جذب رنگ داشته و به‌عنوان یک جاذب کارآمد و قوی برای حذف آلاینده‌ها از محیط‌های آبی قابل استفاده است.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

In Situ Synthesis of Chitosan-Grafted Polyacrylamide Loaded by TiO2 Nanoparticles for the Adsorption of Sirius Yellow K-CF from Aqueous Media: Isotherm, Kinetic and Thermodynamic Studies

نویسندگان [English]

  • Ehsan Binaeian 1
  • Saber Babaee Zadvarzi 2
  • Alireza Hoseinpour Kasgari 3
  • Morteza Ebrahimnezhd Afrouzi 4
1 Assoc. Prof. of Chemical Engineering, Department of Chemical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
2 PhD Student of Chemical Engineering, Department of Chemical Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran
3 Assist. Prof. of Textile Engineering, Department of Textile Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
4 Assist. Prof. of Chemical Engineering, Department of Chemical Engineering, Imam Muhammad Bagher Technical University, Sari, Iran
چکیده [English]

Toxic waste water and infected water are the considerable sources of environmental contaminations . Dyes as the source of toxicity of waste water are used in various industries like dyestuff, textile, paper, plastics and pharmaceutical. Recently, reactive dyes have been commonly used because of their advantages such as better dyeing processing conditions and bright colors. So, removal of dyes from effluents is so important.  Among the materials used as the common adsorbents, chitosan and polyacrylamide are relatively cheap and the promising materials can be used as adsorbents. In the present study, TiO2 nanoparticles dispersed in chitosan grafted polyacrylamide matrix was synthesized by in situ method and used for the removal of Sirius yellow K-CF dye from aqueous solution. The synthesized nano-composite was characterized by FE-SEM, TEM, XRD and FT-IR. The effect of pH, adsorbent dosage, time and temperature were investigated. The results showed that the highest dye removal efficiency was happended in the acidic pH of 2 with 0.05 g of TiO2-PAA-Ch adsorbent. The equilibrium data were compatible very well with the Langmuir isotherm (qm=1000 mg/g, 96.81% of dye removal). The Dubinin-Radushkevich isotherm and thermodynamic studies proved that the adsorption process is physical, endothermic and spontaneous. Kinetic study verifies that pseudo second order kinetic model is the predominant model. In this study, TiO2 nanoparticles dispersed in polymer matrix was synthesized and employed for the removal of Sirius yellow K-CF from aqueous media. Electrostatic attraction between positive charges of adsorbent surface (NH3+) and molecules of anionic dye together with formation of hydrogen bond (Dye-NH3+) cause the adsorption of dye on PAA-Ch. On the other hand, Ti+4 in PAA-Ch structure can intract with the anionic molecules through the electrostatic adsorption. The results of this study interact that the new synthesized TiO2-PAA-Ch composite with high amount of NH2 functional groups and Ti+4 is an efficient adsorbent for an environmental applications to remove many contaminants, dyes and organic pollutants.

کلیدواژه‌ها [English]

  • Adsorption
  • Polyacrylamide
  • Chitosan
  • TiO2
  • Composite

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