بیوکامپوزیت مغناطیسی هالویسایت - نانوکیتین عامل‌دار شده برای حذف سرب (II) از محیط‌های آبی: سنتز، سینتیک و آنالیز ترمودینامیکی
الموضوعات : Environmental pollutionالهه ناصرنصیر 1 , حسین پرورش 2 , فاطمه السادات محسنی شهری 3 , فرید معین پور 4 , محسن دهقانی قناتغستانی 5
1 - گروه مهندسی محیط زیست، واحد بندر عباس، دانشگاه آزاداسلامی، بندر عباس، ایران
2 - گروه مهندسی محیط زیست، واحد بندر عباس، دانشگاه آزاداسلامی، بندر عباس، ایران
3 - گروه شیمی، واحد بندر عباس، دانشگاه آزاداسلامی، بندر عباس، ایران
4 - گروه شیمی، واحد بندر عباس، دانشگاه آزاداسلامی، بندر عباس، ایران
5 - گروه مهندسی محیط زیست، واحد بندر عباس، دانشگاه آزاداسلامی، بندر عباس، ایران
الکلمات المفتاحية: NiFe₂O₄-HNT-Chitin , نانوکامپوزیت مغناطیسی, جذب سطحی, جذب یون سرب (II),
ملخص المقالة :
مقدمه: آلودگی آب به یون‌های سرب (II) به دلیل سمیت شدید و آثار جبران‌ناپذیر بر سلامت انسان، به‌ویژه بر سیستم عصبی، یکی از چالش‌های مهم زیست‌محیطی است. این پژوهش با هدف توسعه جاذبی کارآمد، زیست‌سازگار و قابل بازیافت، به سنتز و ارزیابی یک بیوکامپوزیت مغناطیسی نوین بر پایه نانولوله‌های هالویسایت و کیتین عامل‌دارشده با فریت نیکل (NiFe₂O₄-HNT-Chitin) برای حذف Pb(II) از محلول‌های آبی پرداخته است. استفاده از هالویسایت و کیتین به‌دلیل فراوانی، هزینه پایین و زیست‌سازگاری، همراه با افزودن خاصیت مغناطیسی و گروه‌های عاملی، عملکرد جذب و قابلیت جداسازی جاذب را بهبود بخشید.
مواد و روش‌ها: در روش کار، ابتدا هالویسایت با اسید هیدروکلریک اصلاح و با فریت نیکل پوشش داده شد. عامل‌دار کردن هالویسایت و کیتین به‌ترتیب با APTES و CPTES انجام گرفت و محصول نهایی با تکنیک‌های FT-IR، XRD، SEM، TEM، BET، EDS و VSM شناسایی شد. عملکرد جذب در آزمایش‌های ناپیوسته و در شرایط مختلف pH، زمان تماس، دوز جاذب، غلظت اولیه Pb(II)، قدرت یونی و دما بررسی گردید. داده‌ها با مدل‌های سینتیکی، ایزوترمی و ترمودینامیکی تحلیل شدند.
نتایج و بحث: نتایج FT-IR و XRD تأیید کردند که NiFe₂O₄ و گروه‌های عاملی به‌طور موفق بر ساختار هالویسایت و کیتین تثبیت شده‌اند. تصاویر میکروسکوپی نشان دادند که نانولوله‌ها با ذرات فریت نیکل و کیتین پوشیده شده و مساحت سطح BET برابر m²/g 33/81 حاصل گردید. این جاذب در شرایط بهینه (pH=6، دوز g/100 mL 05/0، دمایC ∘25) ظرف 10 دقیقه به تعادل رسیده و ظرفیت جذب حداکثری N=3, p<0.05) mg/g) 12/5 ± 370/37 را نشان داد. تحلیل داده‌ها بیانگر تطابق کامل با مدل شبه مرتبه دوم (R²=0.999) و ایزوترم لانگمویر (R²=0.996) و ماهیت جذب تک‌لایه شیمیایی بود.
اختلاف بین مدل‌ها از نظر آماری معنی‌دار بود (p < 0.05). بررسی ترمودینامیکی نشان داد فرآیند گرمازا، خود به‌خودی و همراه با کاهش بی‌نظمی سطحی است. جاذب پس از چهار چرخه جذب-واجذب، کارایی بالای خود را حفظ کرد و کاهش راندمان در چرخه چهارم نسبت به چرخه اول از نظر آماری معنی‌دار نبود. (p > 0.05).
نتیجه‌گیری: کامپوزیت NiFe₂O₄-HNT-Chitin با ترکیب مزایای ساختار لوله‌ای هالویسایت، گروه‌های عاملی کیتین و خاصیت مغناطیسی NiFe₂O₄، جاذبی سبز، سریع‌العمل، پایدار و قابل بازیافت برای حذف Pb(II) از آب محسوب می‌شود.
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