کارایی جاذب مغناطیسی دانه‌ای‌شکل بر پایه زئولیت طبیعی-پلیمر کیتوسان در حذف آرسنیک از آب‌های آلوده

نوع مقاله : پژوهشی

نویسندگان

تبریز، دانشگاه تبریز، دانشکده مهندسی شیمی و نفت، گروه مهندسی شیمی، صندوق پستی 16471-51666

چکیده

فرضیه: از میان آلاینده‌های مختلف موجود در آب طبیعی، آرسنیک به‌دلیل سمیت زیاد، از اهمیت بیشتری برخوردار است. جذب سطحی یکی از کاراترین روش‌ها برای حذف این آلودگی‌ از جریان‌های آب آلوده به آن است. از جمله جاذب‌های آرسنیک می‌توان به نانوکامپوزیت‌های زئولیتی اشاره کرد. جاذب‌های پودری به‌دلیل ایجاد مشکلاتی از قبیل گرفتگی صافی‌ها، افت فشار زیاد پمپ و نیز مشکل جداسازی از آب در سامانه‌های صنعتی کارایی چندانی ندارند.
روش‌ها: برای حل مشکل نام‌برده، پودرهای نانوکامپوزیت زئولیتی با روش ژل‌سازی به‌کمک پلیمر 
کیتوسان و با سه نوع محلول‌ اتصال‌دهنده عرضی شامل سدیم هیدروکسید، سدیم تری‌پلی‌فسفات و سدیم هیدروکسید + سدیم تری‌پلی‌فسفات دانه‌ای‌شکل شدند. اثر عوامل مختلفی از قبیل نوع و نسبت اولیه مواد در شکل‌گیری دانه‌های تهیه‌شده بررسی شد.
یافته‌ها: نتایج نشان داد، دانه‌ها در محلول اتصال‌دهنده عرضی سدیم هیدروکسید + سدیم تری‌پلی‌فسفات و نسبت اولیه بهینه 1 به 3 از کیتوسان به نانوکامپوزیت شکل ظاهری مناسب‌تر و استحکام بهتر و نیز عملکرد بهتری در جذب آرسنیک دارند. به‌منظور تأیید و توجیه نتایج فوق از آزمون‌های SEM، BET و AAS استفاده شد. پارامترهای عملیاتی مختلف از قبیل مقدار غلظت اولیه آرسنیک و دُز جاذب در بازده جذب این دانه‌ها بررسی و مقدار بهینه دُز جاذب 1g/L، با بازده 92.9 تعیین شد. در ادامه‌، برای دستیابی به اطلاعات بیشتر درباره نحوه جذب و تعیین حداکثر ظرفیت جاذب، هم‌دما‌های Langmuir و Freundlich برای جاذب‌های دانه‌ای بررسی شدند. بیشترین ظرفیت جذب 7450.7mg/g به‌دست آمد و نتایج نشادن داد، هم‌دمای Freundlich هم‌خوانی بهتری با داده‌های به‌دست‌آمده دارد. 

کلیدواژه‌ها

عنوان مقاله [English]

Efficiency of Magnetic Granular Adsorbent Based on Natural Zeolite/Chitosan in Removing Arsenic from Polluted Water

نویسندگان [English]

  • Maryam tahmasebpoor
  • Leila Sanaei
  • maryam noori
Faculty of Chemical and Petroleum Engineering, University of Tabriz, P.O. Box 51666-16471, Tabriz, Iran
چکیده [English]

Hypothesis: Among the various pollutants found in natural water, the heavy metal arsenic is more important due to its high toxicity. One of the most efficient methods to remove this pollution from water streams is the surface adsorption method. Zeolite nanocomposites can be considered powerful among arsenic adsorbers. Powder adsorbents are not very effective in industrial systems due to the problems such as clogging of filters, high pressure drop and also the problem of separation from water.
Methods: To solve this problem, zeolite nanocomposite powder was transformed into beads using the chitosan gel method in three different types of cross-linking solutions including sodium hydroxide, sodium tripolyphosphate and joint sodium hydroxide/sodium tripolyphosphate. The effect of various parameters such as the type and initial ratio of the materials on the formation of beads was investigated.
Findings: The results showed that the beads formed in the sodium hydroxide+sodium tripolyphosphate cross-linking solution and the optimal initial ratio of 1:3 from chitosan to the nanocomposite have a more suitable appearance and strength and better performance in arsenic absorption. In order to confirm and justify the mentioned Findings, SEM, BET and AAS analyses were performed. Operational parameters of initial arsenic concentration and adsorbent dose which are effective on the beads’ adsorption efficiency were investigated and the optimal amount of adsorbent dose was determined as 1 g/L with an efficiency of 92.9%. In order to obtain more information about the method of adsorption and determining the maximum capacity of adsorbents, Langmuir and Freundlich isotherms for granular adsorbents were investigated. The highest adsorption capacity of 7450.7 mg/g was obtained and Freundlich isotherm was in better agreement with the results.

کلیدواژه‌ها [English]

  • Adsorbent
  • Chitosan polymer
  • Natural zeolite
  • arsenic
  • Bead

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مجله علوم و تکنولوژی پلیمر
دوره 35، شماره 4 - شماره پیاپی 180
مهر و آبان 1401
صفحه 367-379

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