نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری تخصصی محیط‌زیست، گروه محیط‌زیست، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

2 دانشیار، گروه محیط‌زیست، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

3 استاد، گروه محیط‌زیست، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

4 استادیار، گروه مهندسی شیمی، دانشکده فنی و مهندسی، واحد گچساران، دانشگاه آزاد اسلامی، گچساران، ایران

چکیده

با توجه به آلودگی بوم‌سازگان‌های آبی به فلزات سنگین به‌واسطه تخلیه پساب‌های صنعتی، شهری و کشاورزی، این پژوهش با هدف بررسی کارایی حذف یون عناصر سرب و کروم از محلول‌های آبی توسط غشاهای نانوکامپوزیتی با لایه نازک (TFN) ساخته‌شده با استفاده از پلیمریزاسیون سطحی در ترکیب با نانوذرات سلولز اصلاح‌شده (mNC) انجام شد. بدین منظور، نسبت به اصلاح نانوبلور­های سلولز، ساخت بستر غشایی و آماده­سازی لایه پلی­آمید برای حذف سرب و کروم از آب اقدام شد. خصوصیات ظاهری نانوذرات اصلاح‌شده و غشاهای نانوکامپوزیتی نیز با استفاده از میکروسکوپ الکترونی عبوری (TEM)، میکروسکوپ الکترونی روبشی (SEM)، طیف­ مادون‌قرمز (FT-IR)، میکروسکوپ نیروی اتمی (AFM) و پتانسیل زتا بررسی شد. نتایج نشان داد که شار آب در غشای TFN2 از 42 به l/m2/h 125 افزایش یافت. از طرفی، در pH برابر با 5/8، نرخ حذف عناصر سرب و کروم به­ترتیب برابر با 93 و 100% به‌دست آمد. همچنین، در این شرایط، فرآیند جذب این عناصر از ایزوترم لانگمویر پیروی کرد. علاوه بر آن، مشخص شد که فرآیند جذب عناصر از مدل سینتیکی شبه مرتبه دوم پیروی کرده است. درمجموع، از غشای سنتزشده نانوکامپوزیت با تعبیه نانوبلورهای اصلاح‌شده سلولز می‌توان در حذف مؤثر یون عناصر سرب و کروم از محلول­های آبی استفاده کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Efficient Removal of Pb(II) and Cr(III) Ions from Aqueous Solutions Using Modified Cellulose Nanocrystals into the Polyamide Nanofiltration Membrane

نویسندگان [English]

  • Keivan Farokhi 1
  • Mehrdad Cheraghi 2
  • Soheil Sobhan Ardakani 3
  • Bahareh Lorestani 2
  • Daryoush Emadzadeh 4

1 Ph.D. Scholar, Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran

2 Assoc. Professor, Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran

3 Professor, Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran

4 Assist. Professor, Department of Chemical Engineering, College of Engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran

چکیده [English]

Nowadays, discharge of toxic heavy metals through industrial, domestic, and agricultural effluents into the environment, in this study, the efficiency of thin-layer nanocomposite (TFN) nanofiltration membranes made using surface polymerization in combination with modified cellulose nanoparticles (mNC) was assessed for the removal of lead and chromium ions from aqueous solutions. In so doing, after modification of MNCSNCs, fabrication of membrane substrate and also PA selective layer, and then testing the performance of the membrane, the physical properties of the modified nanoparticles and nanocomposite membranes were also investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and zeta potential. Based on the Results obtained, the water flux of TFN2 membranes increased from 42 to 125 l/m2/h. Also, at pH = 8.5, the removal rate of Pb(II) and Cr(III) was 93% and 100%, respectively. Moreover, under these conditions, the adsorption process followed the Langmuir adsorption isotherm and the pseudo-second-order kinetic models. In general, the results showed that the synthesized nanofiltration nanocomposite membrane by embedding modified cellulose nanocrystals can be used to effectively remove Pb(II) and Cr(III) ions from aqueous solutions.

کلیدواژه‌ها [English]

  • Heavy Metals
  • Isotherm Model
  • Kinetic Model
  • Pseudo-Second-Order
  • Surface Polymerization
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