بررسی سینتیک و ماهیت جذب مالاشیت گرین توسط ریزجلبک‌های سبز

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان

2 دانشیار، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان

3 استادیار، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان

4 استاد، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان

چکیده

در مطالعه حاضر، تأثیر چهار فاکتور اصلی غلظت اولیه مالاشیت گرین، pH اولیه محلول حاوی مالاشیت گرین، وزن زی‌توده جلبک‌ها و مدت زمان انجام آزمایش بر روی راندمان جذب مالاشیت گرین توسط ریزجلبک‌های سبز سندسموس و کلرلا با استفاده از روش باکس- بنکن مورد ارزیابی قرار گرفت. حداکثر راندمان جذب زیستی مالاشیت گرین توسط ریزجلبک‌های سبز سندسموس و کلرلا به‌ترتیب 23/76 و 32/91 درصد بود. در شرایط بهینه، مدل شبه‌‌درجه دوم بهترین تناسب را با داده‌های آزمایش نسبت به سایر مدل‌ها نشان داد (99/0<). روش اسپکتروسکوپی مادون قرمز نشان داد که چندین گروه عاملی، به‌خصوص گروه‌های کربوکسیل، هیدروکسیل و آمین در سطح زی‌توده‌های جلبکی، مسئول اتصال یون‌های مالاشیت گرین به سطح جلبک‌ها در فرایند جذب زیستی هستند. علاوه بر این، تفاوت راندمان‌های حدف مالاشیت گرین توسط زی‌توده‌های جلبکی، می‌تواند ناشی از تفاوت در برخورد بین مولکول‌های رنگی و زی‌توده‌های جلبکی باشد. این یافته‌ها نشان داد که زی‌توده‌های جلبکی می‌توانند به‌عنوان مواد زیستی مناسب برای جذب زیستی مالاشیت گرین از پساب استفاده شوند. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Kinetics and Nature of Malachite Green Biosorption by Green Microalgae

نویسندگان [English]

  • Masoud Kousha 1
  • Omidvar Farhadian 2
  • Salar Dorafshan 3
  • Nasrollah Mahboobi Soofiyani 4
1 Grad. MSc Student, Dept. of Natural Resources, Isfahan University of Tech., Isfahan
2 Assoc. Prof., Dept. of Natural Resources, Isfahan University of Tech., Isfahan
3 Assist. Prof., Dept. of Natural Resources, Isfahan University of Tech., Isfahan
4 Prof., Dept. of Natural Resources, Isfahan University of Tech., Isfahan
چکیده [English]

In the present study, the Box-Behnken design was used to investigate the effects of the four main parameters of initial Malachite green )MG( concentration, initial solution pH, algae content, and contact time on the efficiency of dye biosorption by the green microalgae Scenedesmus quadricauda and Chlorella vulgaris. The results showed that maximum dye removal efficiencies of S. quadricauda and C. vulgaris biomasses for the biosorption of MG were 76.23 and 91.32%, respectively. Under optimum conditions, the pseudo-second order fitted with the experimental data much better than other similar models (R2>0.99). The FT-IR spectroscopy method showed that several functional groups, especially carboxyl, hydroxyl, and amine groups, present on the surface of the S. quadricauda and C. vulgaris biomasses are responsible for binding of MG ions in the biosorption process. The differences observed in the MG biosorption efficiencies of algal biomasses may be attributed to differences in interactions between the dye molecules and the algal biomasses. Finally, the findings revealed that the algal biomasses used in this study are suitable as the biomaterial for MG biosrption from wastewaters.

کلیدواژه‌ها [English]

  • Biosorption
  • Scenedesmus quadricauda
  • Chlorella Vulgaris
  • Kinetic Models
  • Fourier Transform Infra-Red
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