بررسی ایزوترم و سینتیک جذب سرب از پساب سنتتیک با استفاده از خاک اره درخت اوکالیپتوس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، باشگاه پژوهشگران جوان و نخبگان، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 استادیار، دانشگاه آزاد اسلامی، واحد تهران غرب، گروه محیط زیست، تهران، ایران

چکیده

فلز سرب کاربردهای زیادی در صنایع گوناگون دارد. به‌دلیل سمی بودن این فلز، تخلیه پساب‌های صنعتی حاوی آن، خطرات جبران‌ناپذیری برای محیط زیست و اکوسیستم‌های زنده دارد. این پژوهش با هدف بررسی استفاده از خاک اره درخت اوکالیپتوس به‌عنوان جاذبی ارزان قیمت برای حذف سرب از پساب انجام شد. آزمایش‌ها در سیستم ناپیوسته انجام شد و تأثیر پارامترهای pH، مقدار جاذب، زمان تماس و غلظت اولیه سرب مورد بررسی قرار گرفت. باتوجه به نتایج، حداکثر راندمان جذب سرب 25/96 درصد بود که در pH و زمان تماس 7 و 30 دقیقه و مقدار جاذب 10گرم در لیتر به‌دست آمد. با افزایش غلظت اولیه سرب مقدار فلز جذب شده و درصد حذف افزایش یافت. داده‌های این مطالعه تطابق خوبی با ایزوترم لانگمیر نشان دادند. آنالیز سینتیک نشان داد که جذب سرب با مدل سینتیکی جذب مرتبه دوم مطابقت دارد (998/0=R2). با توجه به راندمان بالای حذف سرب توسط خاک اره درخت اوکالیپتوس می‌توان از این روش به‌عنوان روشی کارآمد و ارزان قیمت برای جذب سرب استفاده نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Kinetic and Isotherm Study of Lead Adsorption from Synthetic Effluent by Eucalyptus Sawdust

نویسندگان [English]

  • Sadegh Ghasemi 1
  • Roya Mafi Gholami 2
1 PhD Student, Young Researchers and Elite Club, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
2 Assist. Prof. Department of Environment Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

Lead is a heavy metal which has many applications in different industries. Due to toxicity of lead, discharging industrial effluents which contain these ions will bring irreversible risks to the environment and living ecosystems. The objective of this study is to analyse the use of Eucalyptus sawdust as a cheap adsorbent for lead removal from effluent. The experiments were conducted in batch system and the effect of pH, the amount of adsorbent, contact time and the initial concentration of lead were examined. Noticing the results, the maximum efficiency of lead adsorption is 96.25% which was obtained in pH of 7 and contact time of 30 minutes and 10 g/L of adsorbent. By increasing the initial concentration of lead, the adsorbed metal and removal percentage also increased. Achieved data from this study indicated a good compatibility with Langmuir adsorption isotherm. Kinetic analysis indicated that lead adsorption matches with the second-order kinetic adsorption model (R2=0.998). Noticing the high efficiency of lead removal by Eucalyptus sawdust, this method could be used as an effective and cheap adsorbent for lead removal.

کلیدواژه‌ها [English]

  • Lead removal
  • Eucalyptus Sawdust
  • Adsorption
  • Low-cost Adsorbent
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