بررسی همدماهای جذب نیترات توسط زغال‌های زیستی پوشش‌داده شده با آهن(III) و روی به کمک اولتراسونیک

آب و خاک

دوره 38، شماره 5 - شماره پیاپی 97، آذر و دی 1403، صفحه 554-541   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.2024.86650.1379

نویسندگان

محمد رضا آلاشتی¹؛ مجتبی خوش روش^{* 1}؛ فردین صادق زاده²؛ هازی محمد عظمت الله³

¹گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

²گروه علوم و مهندسی خاک، دانشگاه علوم کشاورزی و منابع طبیعی ساری

³گروه مهندسی عمران و محیط زیست، دانشگاه هند غربی، ترینیداد و توباگو

چکیده

نیترات یکی از مهم‌ترین آلاینده‌ها در منابع آبی می‌باشد که سبب بروز مشکلات زیست‌محیطی و بهداشتی می‌شود. این پژوهش با هدف بررسی همدماهای جذب لانگمویر و فروندلیچ، در توصیف جذب نیترات توسط اشکال مختلف زغال‌های زیستی انجام شد. در این پژوهش پس از انجام پیش‌آزمایشات بهینه‌سازی دوز جاذب در نسبت‌های 1/0، 3/0، 5/0، 8/0 و 1 گرم از جاذب و 40 میلی‌لیتر محلول نیترات، غلظت‌های 20، 45، 80، 100، 150 و 200 میلی‌گرم در لیتر محلول نیترات (از منبع نیترات پتاسیم) مورد بررسی قرار گرفت. تیمارهای آزمایشی شامل زغال زیستی (B)، زغال زیستی و اولتراسونیک (BU)، زغال زیستی با پوشش آهن(III) (BF)، زغال زیستی با پوشش آهن(III) و اولتراسونیک (BFU)، زغال زیستی با پوشش روی (BZ) و زغال زیستی با پوشش روی و اولتراسونیک (BZU) و تعداد تکرار 3 عدد بود. نتایج نشان داد تیمارهای BF و BFU به‌ترتیب با مقادیر جذب 34/3 و 66/3 میلی‌گرم بر گرم دارای ماکزیمم ظرفیت جذب بود. همدمای فروندلیچ، با توجه به مقادیر ضرایب تعیین بالاتر و RMSE کمتر برازش بهتری را برای داده‌های جذب نشان داد. در بررسی همدمای فروندلیچ، مقادیر n (درجه‌ی همگنی سطوح جذب‌کننده)، برای تیمارهای BF و BFU (با مقادیر بین 2 تا 10) نشان‌دهنده‌ی همدما از نوع مطلوب بود. مقادیر بالای ظرفیت جذب (K_F) به‌دست آمده برای BF و BFU که به‌ترتیب 414/1909 و 22/1484 ((mg g^-1)(L mg^-1)^1/n) است، نشان‌دهنده‌ی ظرفیت جذب بالای این جاذب‌ها برای نیترات است. مقایسه‌ی مقادیر به‌دست آمده برای درصد حذف نیترات از محلول، ضریب تعیین همدماها و نیترات جذب‌شده در واحد وزن ماده‌ی جذب‌کننده (q_e)، نشان داد اولتراسونیک اثرات مثبتی بر فرآیند جذب نیترات توسط بیوچار دارد.

کلیدواژه‌ها

جاذب؛ ظرفیت جذب؛ فروندلیچ؛ همدمای خطی

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