بررسی اثر رقابتی یون‌های آهن، کادمیم و روی بر حذف سرب از محیط‌های آبی با استفاده از جاذب نانوساختار خاکستر سدر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

2 استاد گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

3 دانشجوی دکترای آبیاری و زهکشی، دانشکده کشاورزی، دانشگاه فردوسی مشهد

4 دانش‌آموخته کارشناسی ارشد مهندسی عمران، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی واحد دزفول

5 استادیار گروه آب و فاضلاب، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی واحد اهواز

چکیده

هدف از این پژوهش تعیین کارایی خاکستر نانوساختار سدر در حذف سرب از محیط‌های آبی به‌صورت تک و چند‌عنصریبود. به‌این منظور خاکستر نانوساختار سدر سنتز شد و اثر عواملی چون pH، دز جاذب، زمان تماس بر کارایی حذف سرب در سیستم ناپیوسته بررسی شد. برای تعیین ویژگی‌های جاذب از آزمون‌های SEM، PSA و FTIR استفاده شد. تصویربرداری از نانوجاذب تولیدی با میکروسکوپ الکترونی نشان داد که قطر همه ذرات، کوچک‌تر از 207 نانومتر است. نتایج نشان داد که pH بهینه جذب سرب برای سیستم تک‌عنصری 6 و برایچندعنصری5 است. همچنین در سیستم تک و چندعنصری به‌ترتیببیشینه راندمان حذف 97 و 94 درصد و بیشینه ظرفیت جذب 27 و 21 میلی‌گرم بر گرم به‌دست آمد. مقایسه ایزوترم‌های فروندلیچ، لانگمیر و سیپس نشان می‌دهد که مدل لانگمیر،داده‌های سیستم تک‌عنصری را با ضریب تبیین 99/0 و شاخص خطای01/1، بهتر از سایر مدل‌ها توصیف کرده است. همچنین این مدل باضریب تبیین 99/0 و شاخص خطای024/0 برازش بهتری بر داده‌هایسیستم چندعنصریداشت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Competitive Effects of Iron, Zinc, and Cadmium Ions on Lead Removal from Aqueous Solutions Using the Nanostructured Ash Cedar Absorbent

نویسندگان [English]

  • Lale Divband 1
  • Saeid Broomand nasab 2
  • Pooya Shirazi 3
  • Saeid Bibak Hafshejani 4
  • Roya Mafi Gholami 5
1 PhD Student of Irrigation and Drainage, Faculty of Water Science and Engineering, Shahid Chamran University, Ahvaz
2 Prof. of Irrigation and Drainage, Faculty of Water Science and Engineering, Shahid Chamran University, Ahvaz
3 PhD Student of Irrigation and Drainage, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad
4 MSc Graduate of Civil Engineering, Faculty of Engineering, Islamic Azad University, Ahvaz Branch, Ahvaz
5 Assist. Prof. of Water and Wastewater, Faculty of Eng., Islamic Azad University, Ahvaz Branch, Ahvaz
چکیده [English]

The objective of this study was to determine the efficiency of lead removal from aqueous (both single- and multi-element) solutions using the nanostructured ash cedar absorbent. Nanostructured ash cedar was synthesized and the effects of pH, absorbent dosage, and contact time on lead removal efficiency were investigated in a batch system. The absorbent was characterized by SEM, PSA, XRF, and FTIR. SEM results showed that all the particles had diameters smaller than 207 nm. It was also found that the optimum pH values for lead adsorption were 6 and 5 for the single-element and the multi-element systems, respectively. The maximum removal efficiencies of 94% and 98% and maximum adsorption capacities of 27 mg/g and 21 mg/g were obtained for the single- and multi-element systems, respectively. Comparison of the Freundlich, Langmuir, and Sips isotherms showed that the Langmuir model with R2 =0.99 and RMSE = 1.01 for the single element system described the adsorption data better than other models did. Also, this model with R2 = 0.99) and RMSE = 0.024 better fitted the adsorption data in the multi-element system.

کلیدواژه‌ها [English]

  • Nanostructured Ash Cedar
  • Lead
  • Iron
  • Cadmium
  • zinc
  • Single- and Multi-Element Systems

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مجله آب و فاضلاب
دوره 26، شماره 3 - شماره پیاپی 3
پیاپی: 97
مرداد و شهریور 1394
صفحه 11-18

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