حذف و بازیابی کادمیم از محلول‌های آبی به‌وسیله نانوساختار کنوکارپوس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران

2 استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران؛ استادیار گروه مرتع و آبخیزداری، دانشکده کشاورزی، دانشگاه گنبدکاووس، گنبد، ایران

3 استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران

4 دانشیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کرمانشاه، کرمانشاه، ایران

چکیده

فلزات سنگین مواد سمی هستند که از طریق دفع زباله در آب و محیط به زنجیره غذایی وارد می‌شوند. پژوهش حاضر با هدف بررسی حذف یون کادمیم از محلول آبی توسط نانوساختار کنوکارپوس انجام شد. به این منظور کنوکارپوس توسط آسیاب گلوله‌ای در اندازه نانو خرد شد و تأثیر پارامترهای تجربی مانند pH، زمان، دز جاذب و غلظت اولیه کادمیم در فرایند ناپیوسته مورد بررسی قرار گرفت. برای تعیین ویژگی‌های جاذب از آزمون‌های PSA، FTIR وSEM استفاده شد. با تصویربرداری از جاذب نشان داده شد که گودی‌های عمیق سطح جاذب نشان‌دهنده جذب بهتر کادمیم است. 5/8 درصد ذرات جاذب در محدوده نانو ذره و 5/91 درصد ذرات در محدوده نانو ساختار بودند. نتایج نشان دادند که pH بهینه جذب کادمیم 6 و حداکثر راندمان حذف و ظرفیت جذب کادمیم به ترتیب برابر 9/80 درصد و 86/0 میلی‌گرم بر گرم بود. مقایسه مدل‌های ایزوترم و سینتیک جذب نشان داد که مدل ایزوترم لانگمیر و مدل سینتیک هوو به‌ترتیب با داشتن مقادیر R2 برابر 998/0 و 990/0 نسبت به سایر مدل‌ها از برازش بهتر و شرح بهتری از داده‌های جذب برخوردار بودند. پژوهش حاضر نشان داد که جاذب نانوساختار کنوکارپوس یک جاذب مؤثر برای حذف کادمیم از محلول‌های آبی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Cadmium Removal and Recovery from Aqueous Solution Using Conocarpus Nanostructure

نویسندگان [English]

  • Pejman Pourmohammad 1
  • Masoomeh Farasati 2
  • Bahman Farhadi 3
  • Meghdad Pirsaheb 4
1 MSc Student of Water Engineering, Faculty of Agricultural, University of Razi, Kermanshah, Iran
2 Assist Prof. of Water Engineering, Faculty of Agricultural, University of Razi, Kermanshah, Iran; and Assist. Prof. of Watershed Management University of Gonbad Kavoos, Gonbad, Iran
3 Assist Prof. of Water Engineering, Faculty of Agricultural, University of Razi, Kermanshah, Iran
4 Assoc. Prof., Faculty of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
چکیده [English]

Heavy metals are recognized as one of the most toxic groups. They enter the food chain through the waste disposal into the water and environment. This study was carried out with the aim of investigating cadmium ions removal from aqueous solution using conocarpus nanostructure. For this purpose, conocarpus was grinded to nano-size by the ball mill. The effect of experimental parameters such as pH, time, adsorbent dosage and initial concentration of cadmium were studied in batch system. The PSA, FTIR and SEM tests were used to determine the absorbent characteristics. The imaging of adsorbent indicated that surface of conocarpus had many deep pores, which represents the better adsorption of cadmium. 8.5% of adsorbent particles were in the range of nanoparticles and 91.5% of them were in the range of nanostructure. The results showed that optimum pH for cadmium adsorption is 6 and the maximum removal efficiency and adsorption capacity of cadmium are 80.9% and 0.86 mg/g., respectively. Comparing the adsorption isotherm and kinetics models showed that the Langmuir and Ho models, with R2 values of 0.998 and 0.990 respectively, had a better fitting and description of adsorption data than other models. The study showed that conocarpus nanostructure is an effective adsorbent for cadmium removal from aqueous solution.

کلیدواژه‌ها [English]

  • Cadmium
  • Conocarpus Nanostructure
  • Recovery
  • Adsorption Model
  • Industrial Sewage
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