بررسی تعادلی و سینتیکی جذب رنگزای C.I. Basic red 14 بر روی جاذب ارزان قیمت فلدسپار

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی نساجی، دانشکده فنی، دانشگاه گیلان، رشت، ایران

چکیده

دراین تحقیق امکان استفاده از جاذب فلدسپار که یک جاذب معدنی ارزان قیمت بر پایه سیلیکا است، برای حذف رنگزای کاتیونی 14 red Basic. I.C با نام تجاری (  Brilliant red 4G  )از محلول آبی بررسی شد. خصوصیات سطحی جاذب با استفاده از میکروسکوپ الکترونی روبشی (SEM) ،پراش فلوئورسنس پرتو ایکس (XRF )و تبدیل فوریه مادون قرمز (FTIR )بررسی شد.تاثیر عوامل مختلف از جمله مقدار ماده جاذب، مدت زمان تماس، غلظت اولیه رنگزا،pH اولیه و حضور الکترولیت بر فرآیند جذب مورد مطالعه قرار گرفت. نتایج نشان دادند که افزایش pH ،زمان تماس و مقدار جاذب بر میزان رنگبری تاثیر مثبت دارد درحالیکه افزایش غلظت محلول رنگزا سبب کاهش مقدار رنگبری می شود. همچنین افزودن الکترولیت میزان رنگبری را به مقدار بسیار کمی کاهش می دهد که چشمگیر نیست. فلدسپار در زمانی حدود یک ساعت با رنگزای    C.I Basic red 14 به تعادل می رسد راندمان حذف برابر ۹۶ درصد است. در نتیجه فلدسپار یک جاذب قوی و مناسب برای حذف مواد رنگزای کاتیونی از محلولهای آبی است. ایزوترم حالت تعادل با مدل ایزوترمهای جذب النگمیر، فرندلیش، تمکین، ردلیش پیترسون و دوبینین رادشکویچ مطابقت داده شد و نتایج نشان دادند که رنگبری تطابق خوبی با ایزوترم فرندلیش دارد. سینتیک جذب سطحی با استفاده از مدل های سینتیکی شبه مرتبه اول، شبه مرتبه دوم و نفوذ درون ذره ای بررسی شد و مشاهد گردید که فرآیند جذب بر روی فلدسپار از معادالت سینتیکی شبه مرتبه دوم تبعیت میکند، لذا فرآیند جذب سطحی بیشتر بهصورت جذب شیمیایی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Equilibrium and Kinetics Investigations on Sorption of C.I. Basic Red 14 onto Low-cost Feldspar

نویسندگان [English]

  • Hossein Ketabi
  • leila mivehi
Textile Engineering Department, Faculty of Engineering, University of Guilan, Rasht, Iran
چکیده [English]

Feldspar as a low-cost mineral adsorbent based on silica was used to removal a cationic dye, C.I. Basic Red 14 (Brilliant red 4G), from aqueous solution. The adsorbent was characterized using Scanning Electron Microscopy (SEM), X-ray Fluorescence (XRF) and Fourier Transform Infra-Red spectroscopy (FTIR). The effect of some parameters such as the amount of adsorbent, contact time, the initial concentration of dye, initial pH and electrolyte on dye removal was investigated. Results showed that dye removal increased by increasing pH; contact time and adsorbent dosage, whereas decreased by increasing the dye concentration. Also, the addition of electrolyte caused a negligible decreasing in dye removal. It took about 1 hour to equilibrium the feldspar with C.I. Basic red 14 and dye removal efficiency was 96%. So, feldspar is a suitable and powerful absorbent for removal of cationic dye from aqueous solutions. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Temkin, Redlich-Peterson, and Dubinin–Radushkevich adsorption models and found that the experimental data were correlated reasonably well with Freundlich isotherm. The adsorption kinetics was studied by using pseudofirst-order, pseudo-second-order, and intra-particle diffusion models and realized the adsorption of C.I. Basic red 14 on feldspar followed the pseudo-second-order equation which indicates to chemical sorption.

کلیدواژه‌ها [English]

  • Dye removal
  • surface sorption
  • cationic dye
  • feldspar
  • isotherms and kinetics of adsorption

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نشریه مهندسی عمران امیرکبیر
دوره 51، شماره 3
مرداد و شهریور 1398
صفحه 535-546

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