جذب سرب از محلول‌های آبی به‌وسیله سپیولیت و بنتونیت اصلاح‌شده با بیوپلیمر کیتوزان: همدما و سینتیک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد گروه خاکشناسی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، عضو باشگاه پژوهشگران جوان و نخبگان، دانشگاه آزاد اسلامی، واحد کرمان، کرمان، ایران

2 دانشیار گروه خاکشناسی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

چکیده

در این پژوهش، کانی‌های رس سپیولیت و بنتونیت با بیوپلیمر کیتوزان اصلاح شد و ویژگی‌های جذبی آنها برای جذب سرب، در حالت بسته تحت شرایط مختلف، مانند زمان تماس و غلظت اولیه سرب مورد بررسی قرار گرفت. جاذب‌ها با استفاده از روش‌های XRD، XRF، FTIR، SEM و TOC مشخصه‌یابی شد و همدماها و سینتیک جذب سرب توسط این جاذب‌ها بررسی شد. مدل‌های همدمای لانگمیر و فروندلیچ برای توصیف داده‌های تعادلی به‌کار برده شد و ثابت‌های همدماها نیز تعیین شد. مدل فروندلیچ به‌خوبی داده‌های آزمایش جذب سرب به‌وسیله جاذب‌ها را توصیف نمود. پس از اصلاح رس‌ها با کیتوزان، ظرفیت جذب سرب به‌وسیله سپیولیت از 83 به27 میلی‌گرم بر گرم و بنتونیت از 56 به 29 میلی‌گرم بر گرم کاهش یافت. نتایج آزمایش‌های سینتیک نشان داد که رس‌های طبیعی به بیش از 24 ساعت برای به تعادل رسیدن جذب سرب نیاز دارند، درحالی که این زمان در مورد کیتوزان- سپیولیت به 16 ساعت و برای کیتوزان- بنتونیت به 4 ساعت کاهش یافت. مدل‌های سینتیک شبه مرتبه اول، شبه مرتبه دوم، الوویچ و پخشیدگی درون ذره‌ای برای توصیف داده‌های آزمایش به‌کار برده شد. مدل شبه مرتبه دوم، برازش بهتری بر داده‌های جذب سرب به‌وسیله سپیولیت، کیتوزان- سپیولیت و کیتوزان- بنتونیت نشان داد که دلالت بر این دارد که جذب شیمیایی مرحله کنترل‌کننده سرعت جذب سرب است. داده‌های جذب سرب به‌وسیله بنتونیت بهترین برازش را با مدل الوویچ نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Sorption of Lead (Pb) from Aqueous Solutions by Sepiolite and Bentonite Modified with Chitosan Biopolymers: Isotherms and Kinetics

نویسندگان [English]

  • Hamid Reza Rafiei 1
  • Mehran Shirvani 2
1 Former Graduate Student of Soil Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, and Member of young Researchers and Elite Club, Kerman Branch, Islamic Azad University, Kerman, Iran
2 Assoc. Prof. of Soil Sciences, College of Agriculture, Isfahan University of Technology, Isfahan
چکیده [English]

In this study, sepiolite and bentonite clay minerals were modified with a natural chitosan biopolymer and the modified-clays were characterized using XRF, XRD, FTIR, SEM, and TOC analyses. The isothermal and kinetic parameters of lead (Pb) sorption by both the minerals and the modified-minerals were determined in a batch mode under various conditions such as different contact times and initial concentrations of Pb. It was found that the Freundlich model described well the isotherm experimental data of Pb sorption by the sorbents. Modification with chitosan, however, decreased the Pb adsorption capacity of sepiolite from 83 to 27 mg g-1 and that of bentonite from 56 to 29 mg g-1. Kinetic results showed that more than 24 hours was required for Pb sorption by the natural clays to reach equilibrium, while the equilibrium time reduced to 16 and 4 hours for Pb sorption on chitosan-sepiolite and chitosan–bentonite, respectively. The pseudo-second-order model well described the time-dependent Pb sorption data by sepiolite, chitosan-sepiolite, and chitosan-bentonite, suggesting that chemical sorption is the rate-limiting step of Pb adsorption mechanism. The Pb sorption data by bentonite showed the best fit with Elovich model.

کلیدواژه‌ها [English]

  • Lead Sorption Isotherm
  • Polymer-Clay Composite
  • Bentonite
  • Sepiolite
  • Chitosan
  • Water purification
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