کاربرد نانوذرات ZnO تعبیه‌شده در هیدروژل‌های کیتوسان برای بهبود تصفیه فتوکاتالیستی پساب
محورهای موضوعی : پلیمرها در انرژی و کاربردهای بهداشتی و محیطیالهام خلج کریمی 1 , عهدیه امجدی 2 *
1 - مراغه، دانشگاه مراغه، دانشکده فنی و مهندسی، گروه مهندسی شیمی، صندوق پستی ۸۳۱۱۱-۵۵۱۸۱
2 - مراغه، دانشگاه مراغه، دانشکده فنی و مهندسی، گروه مهندسی شیمی، صندوق پستی ۸۳۱۱۱-۵۵۱۸۱
کلید واژه: تصفیه فتوکاتالیستی, آلودگی های آب, نانوذرات اکسید روی, دوپینگ, هیدروژل کیتوسان, بهبود عملکرد,
چکیده مقاله :
آلودگی آب ناشی از مواد شیمیایی مقاوم مانند رنگ‌ها، آنتی‌بیوتیک‌ها و آفت‌کش‌ها یکی از چالش‌های جدی زیست‌محیطی در سراسر جهان است. روش‌های تصفیه سنتی غالباً به دلیل ناکارآمدی در حذف کامل این آلاینده‌ها، با محدودیت‌های بسیاری مواجه هستند. در این میان، فوتوکاتالیست‌ها به‌عنوان یکی از راهکارهای نوآورانه و کارآمد برای تخریب آلاینده‌های آلی و مقاوم، توجه زیادی را به خود جلب کرده‌اند. از میان فوتوکاتالیست‌های مختلف، اکسید روی (ZnO) و دی‌اکسید تیتانیوم (TiO₂) به دلیل خواص برجسته نوری، شیمیایی و کاتالیستی خود، بیشترین کاربرد را دارند. بااین‌حال، ZnO با محدودیت‌هایی مانند بازده پایین جذب نور مرئی، بازترکیب سریع جفت الکترون-حفره و پایداری ضعیف روبه‌رو است. این پژوهش به بررسی روش‌های مختلف سنتز و دوپینگ ZnO پرداخته تا عملکرد فوتوکاتالیستی آن بهبود یافته و حساسیت آن به نور مرئی افزایش یابد. در ادامه، استفاده از هیدروژل‌های مبتنی بر کیتوسان به‌عنوان بستری نوآورانه و زیست‌سازگار برای رفع این محدودیت‌ها پیشنهاد شده است. این هیدروژل‌ها، با ویژگی‌هایی نظیر ظرفیت بالای جذب آلاینده‌ها، زیست‌سازگاری و بهبود پایداری، تأثیر قابل‌توجهی بر کارایی ZnO دارند. نتایج نشان می‌دهد که ترکیب ZnO با هیدروژل‌های کیتوسان می‌تواند به کاهش آلودگی‌های زیست‌محیطی و تصفیه مؤثر آب منجر شود و راهکاری پایدار و عملی برای تصفیه آب صنعتی و شهری ارائه دهد.
Water pollution caused by resistant chemicals such as dyes, antibiotics, and pesticides is a significant global environmental challenge. Traditional treatment methods often face substantial limitations in fully eliminating these pollutants. Among the innovative solutions, photocatalysts have gained considerable attention for their efficiency in degrading organic and resistant pollutants. Zinc oxide (ZnO) and titanium dioxide (TiO₂) stand out among photocatalysts due to their exceptional optical, chemical, and catalytic properties. However, ZnO suffers from challenges such as low visible light absorption, rapid electron-hole recombination, and limited stability, which restrict its efficiency. This study explores various synthesis techniques and doping strategies to improve ZnO’s photocatalytic performance and enhance its visible light sensitivity. Furthermore, the integration of ZnO with chitosan-based hydrogels is proposed as a novel and eco-friendly approach to overcoming these limitations. These hydrogels, featuring high pollutant adsorption capacity, biocompatibility, and enhanced stability, play a crucial role in boosting ZnO’s performance. The results demonstrate that combining ZnO with chitosan hydrogels significantly enhances the degradation efficiency of organic pollutants and offers a sustainable strategy for reducing water pollution. This innovative approach provides a practical and environmentally friendly solution for addressing water contamination and holds potential for application in industrial and municipal wastewater treatment systems.
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