مقایسه عملکرد نانوذرات مغناطیسی اصلاح شده با β-Cyclodextrin/Thermosensitive درحذف دیازینون و فنیتروتیون از محیط آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکترا، گروه محیط‌زیست، دانشکده منابع ‌طبیعی و محیط‌زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشیار، گروه محیط‌زیست، واحد تنکابن، دانشگاه آزاد اسلامی، تنکابن، ایران

3 دانشیار، گروه شیمی کاربردی، واحد ورامین-پیشوا، دانشگاه آزاد اسلامی، تهران، ایران

4 استاد، گروه شیمی تجزیه، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران

5 استاد، گروه محیط‌زیست، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

چکیده

سموم ارگانوفسفره از جمله دیازینون و فنیتروتیون محلول در چربی هستند و در صورت ذخیره مقدار چشمگیر سم در بافت چربی سمیّت تأخیری به‌وجود می‌آید. بر اساس طبقه‌بندی سازمان جهانی بهداشت دیازینون و فنیتروتیون در طبقه دو (مواد شیمیایی با خطر متوسط) قرار دارند. بنابراین در این پژوهش به‌منظور حذف دیازینون و فنیتروتیون از محیط‌های آبی، از نانوذرات مغناطیسی آهن اصلاح شده با بتاسیکلودکسترین/پلیمر هوشمند حساس به دما استفاده شد. اصلاح سطح این نانوذرات برای افزایش پایداری، افزایش قابلیت کاربرد در شرایط مختلف و افزایش کارایی حذف آلاینده‌ها انجام شد. نانوذرات نهایی با تکنیک‌های
FTIR، میکروسکوپ الکترونی عبوری، میکروسکوپ الکترونی روبشی، آنالیز حرارتی و آنالیز عنصری مشخصه‌یابی شدند. در ادامه تأثیر فاکتورهایی مانند pH، ایزوترم‌های جذب، سینتیک جذب، غلظت آلاینده، دمای واکنش، واجذب التراسونیک و قابلیت کاربرد مجدد بر فرایند حذف آلاینده‌ها بررسی شد. نتایج نشان داد که بهترین دما و pH برای حداکثر جذب سموم به‌ترتیب 20 درجه سلسیوس و pH معادل 6 بود. غلظت اولیه در تمام مراحل 100 میلی‌گرم در لیتر و مقدار جاذب 01/0 گرم در نظر گرفته شد. نتایج بررسی‌ها حاکی از پیروی فرایند جذب از مدل لانگمیر بوده و حداکثر ظرفیت جذب برای سموم به‌ترتیب 34 و 29 میلی‌گرم در گرم محاسبه شد. سینتیک واکنش از معادله درجه دو پیروی کرده و زمان تعادل 90 دقیقه بود. تمامی پژوهش‌ها بیانگر کارایی زیاد نانوجاذب در حذف، قابلیت استفاده مجدد برای حذف آلاینده‌ها، کنترل فرایند جذب و واجذب توسط تغییرات درجه حرارت و حذف آلاینده‌ها از نمونه‌های حقیقی هستند.

کلیدواژه‌ها

عنوان مقاله [English]

A Comparative Study of Modified Magnetic Nano-Particles Grafted to β-yclodextrin/Thermosensitive Polymer for Removal of Diazinon and Fenitrothion from Aqueous Solution

نویسندگان [English]

  • Nazli Tizro 1
  • Keivan Saeb 2
  • Elham Moniri 3
  • Homayoun Ahmadpanahi 4
  • Soheil Sobhan Ardakani 5
1 PhD, Dept. of the Environment, College of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Assoc. Prof., Dept. of the Environment, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
3 Assoc. Prof., Dept. of Chemistry, Varamin (Pishva) Branch, Islamic Azad University, Tehran, Iran
4 Prof., Dept. of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran
5 Prof., Dept. of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
چکیده [English]

Organophosphate pesticides such as diazinon and fenitrotion are fat-soluble, so delayed toxicity occurs if significant amounts of them are stored in adipose tissues.  These insecticides have been classified by the World Health Organization (WHO) as class II, having a moderate hazard. Therefore the preparation and use of grafted β-cyclodextrin/thermo-sensitive polymer/modified Fe3O4/SiO2 nano-particles was investigated for the removal of fenitrothion and diazinon from aqueous solution. Modified MNPs were synthesized due to increase of removal efficiency and applicability in different condition. MNPs were synthesized and characterized by using FTIR, SEM, CHN, TGA, and TEM. The effect of some operational parameters, such as pH, adsorption isotherms, sorption kinetics, concentration, reusability, adsorption/desorption temperature, and ultrasound effect on desorption were examined. The results showed that the best sorption of pesticides on the MNPs-AGENVC-CD took place at 20 °C and optimum pH of 6. The initial concentration and nano-sorbent dosage were 100 mg/L and 0.01 g, respectively. The kinetic study showed that the best time for the pesticides sorption was 90 min. Also, the Pseudo-Second-Order model used fitted the adsorption kinetics well, thus exhibiting high correlation coefficients. Pesticides sorption capacity was found to be 34 and 29 mg/g. The equilibrium data of pesticides modified by the MNPs-sorbent were correctly shown by Langmuir, Freundlich, Redlich-Peterson, and Temkin models. The data was well-fitted to Langmuir equation. The findings showed that the proposed method was very impressive, providing a significant adsorption capacity, appropriate reusability and control functions along with temperature variations.

کلیدواژه‌ها [English]

  • MNPs
  • Diazinon
  • Fenitrothion
  • β-Cyclodextrin
  • Smart Polymer

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مجله آب و فاضلاب
دوره 32، شماره 6 - شماره پیاپی 137
بهمن و اسفند 1400
صفحه 67-83

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