تاثیر کاربرد غشای ژئوسینتتیک حاوی نانو ذره در حذف الکتروکینتیک فلز مس از خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران

2 گروه آبیاری و زهکشی، مرکز تحقیقات فنی و مهندسی کشاورزی، کرج، ایران

3 گروه مهندسی ژئوکنیک، دانشکده مهندسی , ریاضیات و علوم طبیعی، دانشگاه اکزتر، اکزتر، انگلستان

چکیده

روش الکتروکینتیک، به عنوان یکی از روش‌های فیزیکی و شیمیایی پالایش خاک‌های آلوده و از جمله روش‌های پرکاربرد در تصفیه محیط‌های خاکی و لجن به شمار می‌رود. در این پژوهش، برای بهبود تصفیه به روش الکتروکینتیک، غشایی با استفاده از الیاف ژئوتکستایل و به روش پلیمریزاسیون شیمیایی توسط پلیمر رسانای پیرول و نانو ذره اکسید مس ساخته شد و در تماس مستقیم با ورقه‌های مسی در داخل میدان الکتریکی قرار گرفت. برای ارزیابی کارایی غشای ساخته شده، مدلی فیزیکی طراحی و ساخته شد و با کائولینیت آلوده شده به فلز مس (با غلظت 200 میلی‌گرم در کیلوگرم خاک خشک) پر گردید. جهت واجذبی فلزات سنگین، از پتاسیم کلرید 01/0 مولار به عنوان محلول‌های آنولیت و کاتولیت استفاده شد. محلول هیدروکلریک اسید 1/0 مولار با نرخ 6/0 میلی‌لیتر در هر ساعت به مخزن حاوی کاتولیت تزریق شد. نتایج نشان داد، جاگذاری غشای ساخته شده در میدان الکتریکی، سبب تسریع خروج فلز مس تحت تاثیر فرآیند الکترواسمز شد. علی‌رغم کاهش جریان خروجی از مدل (در آزمایش با غشای ساخته شده)، غلظت مس باقیمانده در جریان خروجی، 6 برابر غلظت مس باقیمانده در آزمایش کنترل بود. افزایش راندمان حذف فلز مس از 5/29 درصد در آزمایش کنترل (در مجاور الکترود کاتد) به  38 درصد در آزمایش با جاگذاری غشای ساخته شده (در مجاور الکترود کاتد)، حاکی از کارایی غشای طراحی شده در تصفیه الکتروکینتیک است. مقدار انباشت فلز مس در مقطع مجاور الکترود آند در آزمایش با غشای ساخته شده به میزان 29 درصد نسبت به آزمایش کنترل کاهش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Application Effect of Geosynthetic Membrane Containing Nanoparticles in Electrokinetic Removal of Copper from the Soil

نویسندگان [English]

  • samar behrouzinia 1
  • Hojjat Ahmadi 1
  • nader Abassi 2
  • Akbar Javadi 3
1 Department of water engineering, Faculty of agriculture and natural resource, Urmia, Urmia University, Iran
2 Department of Irrigation and Drainage, Agricultural engineering research institute, Karaj, Iran
3 College of Engineering Mathematics and Physical Sciences, University of Exeter , Exeter, UK
چکیده [English]

The electrokinetic method is classified as one of the physical and chemical methods of purification of contaminated soils. This is one of the most widely used methods for purifying soil and sludge. To improve purification by electrokinetic method, a geotextile membrane was fabricated by the chemical polymerization method based on Pyyrole polymer and copper oxide nanoparticles. The membrane was placed in direct contact with the copper electrode in the electric field.  To evaluate the effect of membrane in the electrokinetic removal process, a physical model was designed and filled with copper contaminated kaolinite with concentration of 200 mg/kg. For desorption of copper, 0.01 M potassium chloride was used as anolyte and catholyte solutions. 0.1 M hydrochloric acid was injected into the catholyte chamber at a constant rate of 0.6 mL/h. According to the results, Employing the fabricated membrane in an electric field accelerated the removal of copper by the electrokinetic process. In spite of reducing the outflow (in the test employing the fabricated membrane), the residual copper concentration in the outflow was six times of the residual copper in the control test. The removal efficiency of copper adjacent cathode electrode was increased from 29.5% in the control test to 38% in the test employing the fabricated membrane, which indicates the ability of fabricated membrane in electrokinetic purification. The amount of copper accumulation in the test employing the fabricated membrane was reduced adjacent anode electrode and reached 29% compared to the control test.

کلیدواژه‌ها [English]

  • Pyrrole polymer
  • Purification
  • Conductive membrane
  • Geotextile

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تحقیقات آب و خاک ایران
دوره 51، شماره 10
دی 1399
صفحه 2697-2709

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