ارزیابی کارایی جاذب نانو رس بنتونیت در حذف کروم و کبالت از محلول‌های آبی: مطالعه سینتیک و ایزوترم جذب

نویسندگان
هاجر مریخ پور 1
سهیل سبحان اردکانی 2
1 دانشگاه سید جمال الدین اسدآبادی
2 واحد همدان، دانشگاه آزاد اسلامی
چکیده
مقدمه

از آنجا که جذب سطحی یکی از موثرترین روش‌های حذف فلزات سنگین از محیط است، لذا این پژوهش با هدف بررسی کارایی جاذب نانو رس بنتونیت در حذف کروم و کبالت از محلول‌ آبی سنتتیک انجام یافت.

مواد و روش‌‌ها

همه مراحل آزمایش تحت شرایط بهینه انجام و به ‌صورت ناپیوسته از جاذب نانو رس بنتونیت استفاده شد. اثر متغیرهای pH، مقدار جاذب، غلظت اولیه ماده جذب ‌شونده و زمان تماس بر کارایی حذف کروم و کبالت بررسی شد. همچنین به منظور تعیین ثابت سرعت فرآیند جذب، داده‌‌ها با دو مدل سینتیکی مرتبه اول و شبه مرتبه دوم مقایسه و با ایزوترم‌های لانگ‌‌مویر و فروندلیخ مطابقت داده شدند. پردازش آماری نتایج نیز توسط نرم‌افزار آماری SPSS انجام یافت.

یافته‌‌ها

در مطالعه زمان تعادل، پس از 30 دقیقه کارایی جذب کروم و کبالت به‌ ترتیب 98/2 و %98/9 حاصل شد. بیشینه جذب کروم و کبالت به‌ترتیب در pH ‌های 3 و 5 پس از گذشت 30 دقیقه مشاهده شد. از طرفی بیشترین کارایی جذب کروم و کبالت به‌ترتیب در مقادیر 0/5 و g 2 از جاذب مشاهده شد و با افزایش غلظت جاذب، کارایی جذب روند صعودی قابل ملاحظه نداشت. مطالعات سینتیک جذب نشان داد که مدل سینتیکی شبه مرتبه دوم به‌خوبی با داده‌ها همخوانی داشت. همچنین مدل‌های ایزوترم‌های فروندلیخ و لانگ‌مویر از توانایی توصیف داده‌های جذب برخوردار بودند (0/9 < r2).

نتیجه‌‌گیری

بر اساس نتایج حاصل جاذب نانو رس بنتونیت از توان حذف یون‌های فلزات سنگین سمی از نمونه‌های حقیقی برخوردار است.
کلیدواژه‌ها
ایزوترم جذب
محلول آبی
نانو رس بنتونیت
کروم
کبالت

عنوان مقاله English

Investigation of the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions: Adsorption isotherm and kinetics studies

نویسندگان English

Hajar Merrikhpour 1
Soheil Sobhan Ardakani 2
1 Sayyed Jamaleddin Asadabadi University
2 Hamedan Branch, Islamic Azad University
چکیده English

Introduction and Aims

Nowadays, the presence of toxic heavy metals in the industrial, commercial, domestic and agricultural effluents is known as a major environmental concern. Since the adsorption process is one of the most effective methods for removing of metal ions from the environment, the current study was carried out to investigate the efficiency of bentonite nanoclay as an adsorbent for removal of Cr and Co from aqueous solutions.

Materials and Methods

All stages of the experiment were performed under optimum conditions, using nanosized bentonite absorbent discontinuously. In this study, batch experiments were carried out as a function of solution pH, adsorbent dosage, initial concentration, and contact time. The equilibrium isotherms were characterized and kinetic models were tested. Also, to determine the adsorption rate constant of metals onto the adsorbent, experimental data were compared by pseudo-first-order and pseudo-second-order kinetic models and then were adjusted to Langmuir and Freundlich models. All statistical analyses were performed using the SPSS statistical package.

Results

The results showed that by raising pH, the adsorption efficiency of Co and Cr from solution were increased and decreased respectively. The maximum adsorption capacity of Cr and Co was observed at pH 3 and 5 respectively after 30 minutes. Also, by increasing the adsorbent amount to 0.5 g and 2 g, adsorption efficiency increased and then there is no significant changes in removal efficiency were observed by increasing the adsorbent dosage. Moreover, under these conditions, the kinetics of the adsorption process followed pseudo-second-order and both Langmuir and Freundlich adsorption isotherms with a correlation coefficient greater than 0.90.

Conclusion

Based on the results, it can be concluded that the bentonite nanoclay can be used for removal of metals ions from real samples.

کلیدواژه‌ها English

Adsorption Isotherm
Aqueous Solution
Bentonite Nanoclay
Chromium
Cobalt
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