حذف موفقیتآمیز میکروپلاستیکهای فاضلاب شهری به روش ترکیب چند فناوری (Treatment Train) انعقاد و نانوساختارهای مبتنی بر کبالت
ارتقای ایمنی و پیشگیری از مصدومیت ها,
دوره 13 شماره 4 (1404),
17 اوت 2026
,
صفحه 44-58
https://doi.org/10.22037/iipm.v13i4.52875
چکیده
سابقه و هدف: هدف این مطالعه، تقویت فرایندهای اکسیداسیون پیشرفته (AOPs) با استفاده از نانوذرات بود. در این راستا، توسعه یک فرایند اکسیداسیون پیشرفته مبتنی بر فوتوکاتالیست میتواند راهکاری مناسب برای حذف این آلایندهها تحت تابش نور باشد..
روش کار: انتخاب فرایند مناسب برای تصفیه میکروپلاستیکها و نانوپلاستیکها به هدف کیفی آب، اندازه ذرات، حضور مواد آلی طبیعی و محدودیتهای انرژی و هزینه بستگی دارد. ترکیب چند فناوری کاراتر از واحد منفرد است. روشهای متداول شامل جذب سطحی، بیوچار، کربن فعال، انعقاد-فلوکولاسیون، شناورسازی، میکروفیلتراسیون، اولترافیلتراسیون، نانوفیلتراسیون و اسمز معکوس هستند که ذرات را متمرکز میکنند؛ بنابراین، استفاده از فرایندهای اکسیداسیون پیشرفته برای حذف این تهدیدات ثانویه ضروری است.
یافتهها: این فوتوکاتالیست در ترکیب با فلوکولاسیون توسط آلوم، تعداد میکروپلاستیکهای فاضلاب ورودی تصفیهخانه الف را از 3979±420 به 454±4 عدد و در تصفیهخانه ب از 4651±135 به 561±6 عدد در خروجی نهایی کاهش داد. در شرایط بهینه، کاهش تعداد میکروپلاستیکها در کل فرایند به 7/87-6/88% رسید که به جداسازی و تخریب ساختار پلیمری PET و PP نسبت داده شد. همچنین، استفاده از فوتوکاتالیست Co₃O₄/g-C₃N₄ پس از فلوکولاسیون، کاهش جرم میکروپلاستیکها را بهعنوان شاخصی از تخریب فوتوکاتالیستی، حدود 68% برای PET و 1/66% برای PP نشان داد. بنابراین، این روش ترکیبی علاوه بر جداسازی مؤثر میکروپلاستیکها از فاز آبی، با ایجاد تخریب فوتوکاتالیستی، موجب کاهش جرم و تغییر ساختاری بخشی از پلیمرها نیز شد.
نتیجهگیری: مطالعه نشان داد ترکیب انعقاد و نانوکامپوزیت Co₃O₄/g-C₃N₄ برای فعالسازی PMS، تخریب میکروپلاستیکهای PET و PP تحت تابش UVC را ممکن ساخت. نتایج XRD و FESEM بارگذاری Co₃O₄ و تشکیل اتصال ناهمگون Z-شکل را تأیید کردند و بهبود انتقال الکترون و تولید گونههای واکنشپذیر را نشان دادند.
- واژههای کلیدی : میکروپلاستیکها ؛ تصفیه فاضلاب شهری؛ اکسیداسیون پیشرفته؛ پراکسیمونوسولفات؛ نانوساختار Co₃O₄/g C₃N₄
ارجاع به مقاله
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