سنتز هیدروژل نانوکامپوزیتی بر پایه سدیم آلژینات برای حذف مؤثر آبی متیلن از محلول‌های آبی و کاربردهای ضدباکتری

نوع مقاله: پژوهشی

نویسندگان

تهران، دانشگاه پیام نور، دانشکده شیمی، صندوق پستی 4697-19395

چکیده

آلودگی آب از دیدگاه زیست‌محیطی و سلامت انسان به‌عنوان مهم‌ترین تهدید مورد تأکید قرار گرفته است. در این راستا، جاذب‌های مختلف با ظرفیت و سرعت جذب مناسب سنتز شده‌اند. در پژوهش حاضر، سنتز، شناسایی ساختار و بررسی خواص جذب رنگینه آبی متیلن به‌وسیله هیدروژل نانوکامپوزیتی جدید بر پایه سدیم آلژینات و نانوذرات نقره گزارش شده است. هیدروژل نانوکامپوزیتی مزبور از پلیمرشدن پیوندی مونومرهای آکریلی روی پلی‌ساکارید سدیم آلژینات به‌وسیله آمونیوم پرسولفات به‌عنوان آغازگر رادیکالی و متیلن‌بیس‌آکریل‌آمید به‌عنوان شبکه‌ساز و سنتز هم‌زمان نانوذرات نقره از روش کاهش شیمیایی درجا به‌‌دست آمد. ساختار هیدروژل‌های نانوکامپوزیتی به‌وسیله فنون طیف‌سنجی FTIR ،SEM،TEM، EDX ،XRD و TGA تأیید شد. در ادامه، برای مطالعه رفتار نانوکامپوزیت در مقابل جذب رنگینه آبی متیلن اثر پارامترهای مختلف بر مقدار جذب این رنگینه بررسی شد. بررسی پارامترهای ترمودینامیکی جذب رنگینه نشان داد، فرایند جذب، خودبه‌خود و گرماگیر است. همچنین، جاذب‌های سنتز شده گزینش‌پذیری زیادی در برابر جذب رنگینه‌های کاتیونی و ظرفیت جذب رنگینه  168mg/g نشان دادند. خاصیت ضدباکتری نانوکامپوزیت نیز روی گونه باکتری گرم منفی (E. coli) به‌کمک روش انتشار صفحه انجام و اثر ضدباکتری آن نیز تأیید شد. به‌طور کلی، نتایج به‌دست آمده نشان داد، هیدروژل‌های نانوکامپوزیتی سنتز شده با خواص ضدباکتری و جذب رنگینه می‌توانند در کاربردهای پزشکی و نیز تصفیه آب و پساب‌های صنعتی از راه حذف و جذب مواد رنگینه به‌کار گرفته شوند.

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis of Nanocomposite Hydrogels Based on Sodium Alginate for Effective Removal of Methylene Blue and Antibacterial Applications

نویسندگان [English]

  • Hossein Hosseinzadeh
  • Amin Ahmadi
Faculty of Chemistry, Payame Noor University, P.O. Box: 19395-4697, Tehran, Iran
چکیده [English]

Hypothesis: Water pollution has been emphasized as one of the major threats to environment and human health. In this regard, various adsorbents with high adsorption capacities and rapid sorption rates have been synthesized. In the present study, we report the synthesis, structure characterization and methylene blue adsorption of a novel hydrogel nanocomposite based on sodium alginate and silver nanoparticles.
Methods: The hydrogel nanocomposite was prepared using grafting of acrylic monomers onto sodium alginate by using ammonium persulfate (APS) as free radical initiator and methylene bisacrylamide (MBA) as crosslinker in the presence of Ag nanoparticles synthesized by an in situ chemical reduction method. The structure of hydrogel nanocomposite was then characterized by FTIR, SEM, TEM, EDX, XRD, and TGA techniques.
Findings: The adsorption behavior of methylene blue dye on the synthesized hydrogel nanocomposites was studied. In order to obtain the maximum adsorption capacity, the effects of various parameters were optimized with respect to dye adsorption capacity of hydrogel nanocomposites in detail. The thermodynamic parameters also demonstrated that the dye adsorption process was spontaneous and exothermic in nature. Moreover, the hydrogel nanocomposite adsorbents showed a high selectivity for the adsorption of cationic dyes with a high adsorption capacity of 168 mg/g. The antibacterial activity of the nanocomposites was examined against E. coli using disk diffusion method. In general, the results indicated that the synthesized hydrogel nanocomposite with antibacterial and dye adsorption properties is a potential material for medical applications as well as wastewater treatment.

کلیدواژه‌ها [English]

  • Hydrogel
  • Nanocomposite
  • sodium alginate
  • antibacterial
  • Ag nanoparticles

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