سنتز و شناسایی جاذب نوین بر پایه سیلیکای مزوپور رشته‌ای (KCC-1) برای حذف فلز سنگین از محلول آبی با رهیافت جذب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه شیمی، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

2 دانشیار، گروه شیمی، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

3 استادیار، گروه مهندسی شیمی، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

چکیده

آلودگی فلزات سمّی در منابع آبی یک نگرانی بزرگ محیط‌زیستی‌ در سرتاسر دنیاست. در این میان، کادمیوم به‌عنوان یکی از سمّی‌ترین فلزات سنگین قلمداد می‌شود زیرا آن نه تنها تهدیدی برای گیاهان، بلکه تهدیدی برای انسانهاست. ازاین‌رو، توسعه روش‌های جدید برای حذف فلز کادیوم اهمیت زیادی برای پژوهشگران دارد. این پژوهش را می‌توان به‌طور کلی به سه بخش تقسیم کرد: 1) سنتز و شناسایی مزوپور سیلیکای رشته‌ای KCC-1، 2) اصلاح سطح و شناسایی KCC-1 عامل‌دارشده با گروه‌های تری‌آمین (TA-KCC-1، 3) بررسی عملکرد TA-KCC1- به‌عنوان جاذب با هدف حذف فلز کادمیوم (Cd) از محیط آبی به‌روش جذب. مواد سنتزشده با آنالیزهای FTIR، FESEM و ایزوترم جذب واجذب نیتروژن شناسایی و بررسی شدند. به‌منظور بررسی ویژگی‌های جذبی و تعیین بهترین ظرفیت جذب برای جاذب TA-KCC-1 شرایط جذبی مانند pH، مقدار جاذب، غلظت اولیه آلاینده، و زمان بررسی و بهینه شد. سپس، به‌منظور بررسی و پیش‌بینی ویژگی‌های جذبی و مکانیزم جذب این آلاینده توسط جاذب TA-KCC-1 ستز شده، از مدل‌های غیرخطی سینتیکی و ایزوترمی مختلف استفاده شد. پارامترهای تئوری به‌دست آمده از داده‌های تجربی نشان دادند که جذب کاتیون Cd(II)، توسط TA-KCC1- از مدل سینتیکی شبه‌درجه دوم و مدل ایزوترمی لانگمیر پیروی می‌کند. در شرایط بهینه زمان= 300 دقیقه، دما = 298 درجه کلوین، مقدار جاذب = 5 میلی‌گرم، pH=7 بیشینه ظرفیت جذب 378 میلی‌گرم بر گرم به‌دست آمد. نتایج حاصل از این پژوهش نشان داد که جاذب نوین گزارش شده در این کار پژوهشی دارای پتانسیل بالایی به‌منظور حذف آلاینده فلز سمّی Cd(II) از محیط‌های آبی است. همچنین، زیست تخریب‌پذیری، طراحی‌پذیری، و ظرفیت جذب بالای این جاذب می‌تواند نویدی برای کارهای پژوهشی مشابه آینده در زمینه حذف دیگر آلاینده‌ها از محیط‌های آبی باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis and Characterization of Novel Adsorbent Based on Mesoporous Fibrous Silica (KCC-1) for Removal of Heavy Metal from Aqueous Solution via Adsorption Approach

نویسندگان [English]

  • Fatemeh Zarei 1
  • Azam Marjani 2
  • Ali Hassani Joshaghani 3
1 PhD Student of Chemistry, Dept. of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
2 Assoc. Prof., Dept. of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
3 Assist. Prof., Dept. of Chemical Engineering, Arak Branch, Islamic Azad University, Arak, Iran
چکیده [English]

Heavy metal pollution in water sources is a great environmental issue worldwide. In this line, Cd(II) is considered to be one of the top toxic heavy metals because it is a threat not only to plants, but also to humans. Accordingly, development of new strategies for removal of Cd(II) is of great importance for scientists. This study could be divided into three overall sections: 1) synthesis and characterization of fibrous mesoporous silica KCC-1, 2) surface modification and characterization of triamine-functionalized KCC-1 (TA-KCC-1), 3) investigation of the applicability of TA-KCC-1 as an adsorbent for the removal of Cd(II) from aqueous solution via adsorption method. Synthesized materials were analyzed and investigated by FTIR, FESEM, and N2 adsorption-desorption isotherms. In order to investigate adsorption features and determine the better adsorption capacity for TA-KCC-1, adsorption conditions such as pH, adsorbent dosage, initial concentration of pollutants, and contact time were monitored and optimized. Then, to investigate and predict the adsorption properties and adsorption mechanism of Cd(II) by synthesized TA-KCC-1, various nonlinear kinetic and isotherm models were used. Theoretical parameters obtained from experimental data revealed that the adoption of Cd(II) cations by TA-KCC-1 follows the Langmuir isotherm model with the maximum adsorption capacity of 378 mg g–1 under optimum conditions (pH=7.0; adsorbent dosage=5.0 mg; time=300 min; temperature=298 K). The results of this study showed that the novel adsorbent reported in this study possesses the high potential for adsorptive removal of Cd(II) from aqueous solution. Also, biodegradability, designability, and high adsorption capacity of this adsorbent may be promising for similar research in the field of adsorption pollutants in the future.

کلیدواژه‌ها [English]

  • Fibrous Silica KCC-1
  • Surface modification
  • Adsorption of Toxic Metals
  • Langmuir isotherm
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