حذف مخلوط یون‌های فلزی سرب، نیکل و کادمیم از محلولهای آبی با استفاده از جاذب نانوحفره MCM-41 اصلاح شده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، تهران

2 استادیار گروه محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، تهران

3 استادیار گروه شیمی، کمیته فناوریهای نو، موسسه پژوهشی برنامه ریزی درسی و نوآوری‌های آموزشی، تهران

چکیده

گروهی از جاذبهای سیلیکاتی میان حفره تحت عنوان MCM-41 که مساحت سطح زیادی دارند، با اصلاح برخی از گروههای عاملی سطحی توسط گروه‌های آمین و ایجاد گونه اصلاح شده NH2-MCM-41، به ظرفیت جذب بالاتری برای جذب یون‌های فلزات سنگین دست پیدا می‌کنند. در این پژوهش، جذب یون‌های کادمیم، نیکل و سرب از محلولهای آبی توسط جاذب اصلاح شده NH2-MCM-41 بررسی شد. کلیه آزمایش‌ها در یک سیستم ناپیوسته و با محلول حاوی سه یون فلزی انجام شد و اثر متغیرهای غلظت اولیه محلول یون‌های فلزی، مقدار جاذب، زمان تماس و pH مورد بررسی قرار گرفت. نتایج نشان داد که  pHبرابر 5 برای جذب بهینه است. با افزایش غلظت یون‌های فلزی و کاهش مقدار جاذب، ظرفیت جذب افزایش یافت. داده‌های آزمایش از مدل‌های لانگمیر و فروندلیچ تبعیت کردند. حداکثر ظرفیت جذب با مدل لانگمیر برای یون‌های فلزات سرب، کادمیم و نیکل به‌ترتیب برابر با 57/74، 18/25، 12/36 میلی‌گرم بر گرم بود. نتایج این مطالعه نشان داد که NH2-MCM-41 جاذبی با ظرفیت جذب بالا برای یون‌های فلزات سرب، نیکل و کادمیم است.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Cd(II), Ni(II), and Pb(II) Ions in an Aqueous Solution by Chemically Modified Nanoporous MCM-41

نویسندگان [English]

  • Aghdas Heidari 1
  • Habibollah Younesi 2
  • Zahra Mehraban 3
1 Ph.D. Student of Environmental Sciences, Faculty of Natural Resources and Marine Sciences, Tarbiat Modarres Univerisity, Tehran
2 . Assist. Prof. of Environmental Sciences, Faculty of Natural Resources and Marin Sciences, Tarbiat Modarres Uni., Tehran
3 Assist. Prof. of Chemistry Dept., New Technology Committee, Research Institute for Curriculum Development and Educational Innovations, Tehran
چکیده [English]

MCM-41 includes a group of silica mesopore components with a high surface area whose adsorption capacities can be enhanced by modifying their surface with amine groups. In this study, the modified NH2-MCM-41 was used to investigate adsorption of Cd(II), Ni(II) and Pb(II) ions in a mixture of aqueous solutions. All the experiments were carried out in a batch system containing a solution of metal ions to study the effects of the initial metal concentration, adsorbent dosage, contact time, and solution pH. The results showed that optimum adsorption would be achieved at pH 5 and that adsorption capacity increased with increasing metal ion concentration but with decreasing adsorbent dosage. Experimental data were fitted with Langmauir and Freundlich models. Maximum adsorption capacities for Ni(II), Cd(II), and Pb(II) were 12.36, 18.25 and 57.74 mg/g, respectively. The results indicate that NH2-MCM-41 is an effective adsorbent for Ni(II), Cd(II) and Pb(II) ions with a high adsorption capacity.

کلیدواژه‌ها [English]

  • MCM-41
  • NH2-MCM-41
  • Lead(II)
  • Nickel(II)
  • Cadmium(II)
  • Adsorption
  • Isotherm
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