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مطالعه آزمایشگاهی و سینتیکی حذف نیترات از آب توسط جاذب نانوکامپوزیت Fe3O4/ ZnO /Cellulose

نوع مقاله : Research Paper

نویسندگان

1 گروه شیلات، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 گروه مهندسی شیمی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

زمینه ­و ­هدف: نیترات به‌عنوان یکی از شاخص‌های شیمیایی آلودگی آب مورد بررسی قرار می‌گیرد. نیترات به دلیل حلالیت بالا در آب، رایج­ترین آلاینده محسوب می­شود که می­تواند سلامت انسان را تهدید کند. مطالعه حاضر با هدف بررسی حذف نیترات از محیط­های آبی با استفاده از نانوکامپوزیت Fe3O4/ZnO/cellulose انجام شد.
مواد و روش­ها: این تحقیق به‌صورت تجربی در یک رآکتور ناپیوسته انجام شد. متغیرهای مؤثر بر فرآیند جذب شامل: pH (2، 4، 6، 8 و 10)، زمان تماس (25، 50، 75، 100، 125، 150، 175، 200، 225، 250، 275 و 300 دقیقه)، غلظت نیترات (0، 50، 100، 150، 200 و 250 میلی­گرم بر لیتر)، دوز جاذب (0، 2، 4، 6، 8 و 10 گرم بر لیتر) و سرعت اختلاط (0، 50، 100، 150، 200 و 250 دور بر دقیقه) بودند. سینتیک و ایزوترم‌های جذب نیز تعیین شد. برای اندازه‌گیری غلظت نیترات از دستگاه اسپکتوفتومتری و برای تعیین خصوصیات جاذب از میکروسکوپ الکترونی روبشی و طیف­سنج مادون قرمز استفاده شد.
یافته ­ها: بر اساس نتایج، pH بهینه جذب 6 بود و با افزایش زمان تماس، مقدار جاذب و راندمان جذب افزایش یافت. سطح ویژه جاذب 10 مترمربع بر گرم به‌‌دست‌ آمد. آزمایش FTIR نشان داد که گروه­های عاملی موجود بر روی جاذب، نقش مهمی در جذب نیترات داشتند. داده­های آزمایشگاهی از سینتیک درجه دوم تبعیت نموده و همچنین ایزوترم فروندلیچ برای توصیف فرآیند جذب، مطابقت بهتری داشت.
نتیجه ­گیری: با توجه ‌به نتایج به‌‌دست ‌آمده، نانوکامپوزیت Fe3O4/ZnO/cellulose می­تواند نیترات را با راندمان بالایی از محلول آبی جذب نماید.

کلیدواژه‌ها

عنوان مقاله [English]

Laboratory and synthetic study of nitrate removal from water by adsorbent

نویسندگان [English]

  • Laleh Roomiani 1
  • Mahsa Mostofipour 2

1 Department of Fisheries, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

2 Department of Chemical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

چکیده [English]

Background and purpose: Nitrate is used as a chemical water quality indicator. The aim of this work was investigation of nitrate adsorption from aqueous solution by Nanocomposite celloluse/Fe3O4/ZnO as a efficient adsorption.
Materials and methods: This study was conducted in a laboratory batch reactor. The most important variables affecting adsorption process were pH (2, 4, 6, 8, 10), time (25, 50, 75, 100, 125, 150, 175, 200, 250, 300 min), nitrate concentration (0, 50, 100, 150, 200, 250 mg/L), adsorption dose (0, 2, 4, 6, 8, 10 g/ L), Mixing speed (0, 50, 100, 150, 200 r/ min) investigated and adsorption kinetic and isotherms were determinated. Spectrophotometer was used for nitrate measurement and adsorbent characteristics were determined by SEM and FTIR examinations
Results: The results showed the optimum pH=6 and nitrate adsorption increased by increasing contact time and adsorbent dosage. The adsorbent specific surfact area of 10 m2/g was obtained and FTIR test revealed the finctional groups existing on adsorbent surface to have important role in nitrate adsorption. Experimental data was well fitted by pseudo second-order kinetic model. Langmuir isotherm model best represented the experimental data to describe adsorption.
Conclusion: Results showed that the nanocomposite cellulose/Fe3O4/ZnO can efficiently remove nitrate from aqueous solution

کلیدواژه‌ها [English]

  • "Adsorption
  • " "Aqueous solution"
  • "Nanocomposite
  • " "Nitrate removal"
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مجله پژوهش در بهداشت محیط
دوره 8، شماره 4 - شماره پیاپی 32
اسفند 1401
صفحه 353-364
فایل ها
هم رسانی
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