بررسی جذب زیستی یون سرب (II) از محلول‌های آبی با استفاده از جلبک پادینا آسترالیس

نویسندگان
نازنین کشوادی
مریم محمدی روزبهانی
گروه آلودگی محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
چکیده
مقدمه

یکی از مهمترین یون‌های فلزی که مضرات زیادی برای محیط زیست و موجودات زنده به‌خصوص انسان دارد، یون سرب است. یکی از روش‌های موثر جهت سرب از محلول‌های آبی، استفاده از جاذب‌های زیستی می‌باشد. هدف از انجام این پژوهش جذب زیستی سرب (II) از محلول‌های آبی با استفاده از جلبک قهوه‌ای پادینا است.

مواد و روش­ها

جلبک پادینا جمع‌آوری شده از سواحل بوشهر، در آون با دمای7۰ درجه سانتی‌گراد به مدت ۲۴ ساعت خشک و سپس آزمایشات جذب در مقادیر مختلف pH(2-9)، زمان تماس (15-150) دقیقه به فاصله 15 دقیقه یکبار و مقادیر مختلف بیومس (2-1/0) و غلظت اولیه محلول (10-50) میلی‌گرم برلیتر و همچنین ایزوترم جذب انجام شد.

یافته­ها

نتایج نشان داد که کارایی حذف یون سرب بر روی بیوجاذب پادینا با افزایش دوز بیوجاذب افزایش و با افزایش غلظت اولیه محلول کاهش می‌یابد. کمترین میزان درصد حذف یون سرب (ІІ) مربوط به زمان 15 دقیقه (22 درصد) و بیشترین میزان، مربوط به زمان 120 تا 150 دقیقه (72 درصد) بود. بیشترین میزان درصد حذف یون سرب (II) مربوط به غلظت 10 میلی‌گرم بر لیتر (92 درصد) بود. همچنین با افزایش pH کارایی حذف افزایش و در نهایت در6 = pH به حداکثر می‌رسد. داده‌های حاصل از بررسی ایزوترم جذب نشان داد که مکانیسم جذب یون سرب (II) بر بیوجاذب پادینا به‌خوبی از ایزوترم لانگمویر پیروی می‌کند.

نتیجه­گیری

بیومس پادینا به عنوان یک جاذب ارزان و با امکان آماده‌سازی در شرایط مختلف می‌تواند به عنوان یک جاذب در حذف یون سرب (II) از محلول‌های آبی مورد استفاده قرارگیرد.
کلیدواژه‌ها
بیوجاذب
یون سرب (II)
جذب زیستی
جلبک پادینا

عنوان مقاله English

Investigation of the Biosorption of Lead (II) from Squeous Solutions using Algae Padina australis

نویسندگان English

nazanin keshvadi
maryam mohammadiroozbahani
Department of environment pollution, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده English

Introduction

Lead is one of the most important metal ions that has many disadvantages for the environment and organisms, especially humans. One of the most effective methods for causing lead from aqueous solutions is the use of biological adsorbents. The purpose of this study was to investigate the biological biosorption of lead (II) from aqueous solutions using Padina algae.

Materials and Methods

Padina algae was collected from Bushehr coastal and dried in an oven at 70 ° C for 24 hours, then adsorption experiments were carried out at pH(2-9), contact time (15-150)minutes, different amounts of biomass(0.1-2) and initial concentration(10-50) mg/L of the solution and Isotherm also.

Results

The results showed that the removal efficiency of lead ion on the bio-absorbent Padina increased with increasing contact time ( lowest at 15 minutes with 22% and highest at 120- 150 minutes with 75%) and Biosorbent dose ( the highest at 10mg/L concentration with 92%) decreased with an increasing initial concentration of the solution. It also increases the removal efficiency by increasing the pH and finally reaches the maximum at pH = 6. The data obtained from the study of isotherm adsorption showed that the mechanism of adsorption of lead ion (II) to the bio-absorbent of the Padina follows well Langmuir isotherm.

Conclusion

Padian biomass can be used as an adsorbent for the removal of lead ions (II) from aqueous solutions as a cheap absorbent and can be prepared under various conditions.

کلیدواژه‌ها English

bio-absorbent
Lead (II)
Biosorption
Padina algae
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