نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 استاد، پژوهشکده سرامیک، پژوهشگاه مواد و انرژی، کرج، ایران
2 استادیار، باشگاه پژوهشگران جوان و نخبگان، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران
چکیده
در این پژوهش، سیستم‌های دوفازی آبی بر پایه دکستران به عنوان یک سیستم دوستدار محیط زیست برای استخراج یون‌های فلزی بکار رفته است که در آن برای ایجاد منطقه دوفازی از نمک سدیم سیترات یا سدیم فسفات استفاده‌شده است. دما، pH، میزان یون فلزی موجود در پساب و میزان استخراج‌کننده ازجمله عوامل تأثیرگذار بر استخراج در سیستم‌های دوفازی آبی هستند که در این تحقیق موردبررسی قرارگرفته است. بدین منظور اثر pH بر استخراج یون‌های فلزی سرب، آرسنیک و کادمیوم در سطوح 7 تا 10 بررسی شده و آزمایش‌ها در دماهای 5 تا 45 درجه‌سانتیگراد تکرار شده است. نتایج آزمایشگاهی حاکی از آن است که در سیستم دکستران/سدیم فسفات، یون‌های فلزی کادمیوم و سرب میتواند تا 100 درصد حذف شوند ولی یون فلزی آرسنیک حداکثر 88% قابلیت جداسازی دارد. در سیستم دکستران/سدیم سیترات، امکان جدسازی 100 درصدی یون‌های فلزی کادمیوم و آرسنیک وجود دارد ولی حداکثر جداسازی سرب60% خواهد بود. برای بررسی تعادل ترمودینامیکی در سیستم‌های دوفازی آبی، از مدل UNIQUAC استفاده شده است. نتایج نشان می‌دهد که این مدل توانایی مدل‌سازی سیستم‌های دوفازی آبی حاوی یون‌های فلزی را داشته و میزان خطای آن‌ها از نتایج تجربی حدود 1% است. خط برازش شده بین ضریب توزیع تجربی و ضریب توزیع به‌دست‌آمده از داده‌های مدل‌سازی، دارای R2 بالاتر از 99/0 است. این نتایج نشان‌دهنده توانایی مدل پیشنهادی برای پیش‌بینی ضریب توزیع یون فلزی برای سیستم بررسی شده است.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Investigation of the Effect of Different Parameters on the Separation of Lead, Arsenic, and Cadmium Ions from Wastewater using Aqueous Two-Phase Systems
نویسندگان [English]
- Mohammad Reza Rahimipoor 1
- Afshin Hamta 2
1 Professor, Department of Ceramic, Materials and Energy Research Center, Karaj, Iran
2 Assistant Professor, Young Researchers and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran
چکیده [English]
In this study, dextran-based Aqueous Two-Phase Systems (ATPS) were used as the environmentally-friendly systems for extraction of metal ions. To this end, sodium citrate or sodium phosphate was used to create the two-phase region. The temperature, pH, metal ion concentration in wastewater, and amount of extractant were among the factors affecting the extraction efficiency in aqueous two-phase systems that were investigated in this study. For this purpose, the effect of pH on the extraction of lead, arsenic, and cadmium ions was investigated at the pH levels of 7-10, and the experiments were repeated at the temperatures ranging from 5 to 45 degrees Celsius. The laboratory results showed that cadmium and lead ions could be removed up to 100 % in the dextran/sodium phosphate system while the maximum separation of the lead ions was 60 % in the dextran/sodium citrate system. The maximum separation of arsenic ions was found to be 88 %. The UNIQUAC model was used to investigate the thermodynamic equilibrium in the aqueous two-phase systems. According to the obtained results, the proposed model could accurately predict the distribution coefficient of the metal ions in the ATPS. The error rate of the model was approximately 1 %. The proposed model can also be used to predict the distribution coefficient of the metal ions in the ATPS.
کلیدواژه‌ها [English]
- Heavy Metals
- Refinery Effluent
- Two-Phase Aqueous System
- Thermodynamic Modeling
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