حذف فسفات از آب و پساب با استفاده از پودر اسکلت داخلی سپیا (ماهی مرکب) به‌عنوان یک جاذب طبیعی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه شیمی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 کارشناسی ارشد، دانشکده علوم پزشکی آبادان، آبادان، ایران

3 دانشیار، مرکز تحقیقات علوم دارویی دریایی، دانشکده داروسازی، دانشگاه علوم پزشکی جندی شاپور اهواز، اهواز، ایران

چکیده

تخلیه یون فسفات از فاضلاب شهری و صنعتی به پیکره آبی باعث رشد بی‌رویه جلبک‌ها می‌شود. هدف از این پژوهش بررسی حذف فسفات از محلول‌های آبی با استفاده از پودر اسکلت داخلی سپیا (ماهی مرکب) به‌عنوان یک جاذب طبیعی زیستی، ارزان و غیرسمّی است. این پژوهش در یک سیستم بسته انجام شد. اسکلت داخلی سپیا با آب مقطر شسته شد. سپس در دمای 80 درجه سلسیوس خشک و به‌وسیله آسیاب کاملاً پودر شد. ویژگی‌های فیزیکی و شیمیایی جاذب با استفاده از دستگاه‌های پارتیکل سایزر، میکروسکوپ نیروی اتمی، طیف‌سنجی مادون قرمز و فلورسانس اشعه ایکس تعیین شد. تأثیر متغیرهای مؤثر بر حذف فسفات مانند pH، مقدار جاذب، زمان تماس، غلظت اولیه فسفات وسرعت اختلاط بهینه شدند. همچنین برای ارزیابی داده‌ها از مدل‌های ایزوترم (لانگمیر، فروندلیچ، تمکین و دوبینین رادشکویچ) و مدل‌های سینتیک شبه‌مرتبه اول و شبه‌مرتبه دوم استفاده شد. نتایج به‌دست آمده نشان داد که بیشترین درصد حذف در pH برابر با 5، مقدار جاذب 5 گرم در لیتر و زمان تماس 10 دقیقه در غلظت اولیه 10 میلی‌گرم در لیتر فسفات مشاهده می‌شود. با استفاده از پودر سپیا تحت شرایط بهینه، یون فسفات موجود در نمونه‌های آبی در غلظت 10 میلی‌گرم در لیتر با بازدهی بیش از 99 درصد حذف شد. نتایج حاصل نشان داد که مدل ایزوترم فروندلیچ بهتر از سایر مدل‌ها داده‌های به‌دست آمده از این پژوهش را توضیح می‌دهد و نشانگر جذب یون فسفات در یک سطح ناهمگن است. با استفاده از مدل لانگمیر، بیشینه ظرفیت جذب برای فسفات، 02/68 میلی‌گرم بر گرم به‌دست آمد. همچنین مدل سینتیکی حذف فسفات از مدل شبه‌مرتبه دوم پیروی کرد. مقدار درصد حذف فسفات از نمونه‌های حقیقی آب رودخانه و آب زهکشی، بیش از 98 درصد به‌دست آمد که نشان‌دهنده توانایی مناسب این جاذب زیستی و ارزان قیمت در حذف این آلاینده از محلول‌های آبی است.

کلیدواژه‌ها


عنوان مقاله [English]

Phosphate Removal from Water and Wastewater using Sepia (Cuttlefish) Endoskeleton Powder as a Natural Adsorbent

نویسندگان [English]

  • Shahla Elhami 1
  • Mehdi Sagha Kahvaz 2
  • Nadereh Rahbar 3
1 Assist. Prof., Dept. of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 MSc, Abadan School of Medical Sciences, Abadan, Iran
3 Assoc. Prof., Marine Pharmaceutical Science Research Center, Faculty of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
چکیده [English]

Wastewaters produced from various industries and their entry into surface water is one of the most important environmental problems that have harmful effects on aquatic life. Discharging phosphate from urban and industrial wastewater to the aquatic environment causes a lot of algae growth. The aim of this study was to evaluate the removal of phosphate from aqueous solutions using sepia endoskeleton (cuttlebone) powder as a natural biomass, cheap and non-toxic absorbent. This study was conducted in a batch system. Sepia endoskeleton was washed with distilled water. It was then dried at 80 °C and thoroughly powdered by milling. Physical and chemical properties of the adsorbent were determined using the Particle Sizer, atomic force microscopy, and infrared spectroscopy and X-ray fluorescence. The effects of variables affecting phosphate uptake, such as pH, adsorbent amount, contact time, initial concentration of phosphate and stirring rate were optimized. Also, the isotherm models (Langmuir, Freundlich, Tamkin and Dubbin-Radshkvich) and first-order and second-order kinetics models were used to evaluate the data. The results showed that the highest removal percentage was observed at pH 5, adsorbent content of 5 g/L and contact time of 10 min at initial phosphate concentration of 10 mg/L. Using sepia powder under optimal laboratory conditions, the phosphate ion with the concentration of 10 mg/L was removed with a yield of over 99%. The results indicated that the Freundlich isotherm model gives a better description than other models showing the adsorption of phosphate ions occurs in a heterogeneous surface. Using Langmuir model, the maximum absorption capacity for phosphate was 68.02 mg/g. The kinetic model of phosphate removal followed the pseudo-second-order model. Besides, the percentage of removal of the real samples was over 98%, indicating the great ability of this natural and inexpensive absorbent to remove this pollutant from the water solutions.

کلیدواژه‌ها [English]

  • Phosphate removal
  • Biomass
  • Sepia Endoskeleton
  • Cuttlebone
  • Water and wastewater
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