مهندسی شیمی ایران

مهندسی شیمی ایران

کیتوزان پوست میگوی اصلاح‌شده: سنتز، شناسایی و کاربرد برای حذف فسفات از پساب

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناسی ارشد مهندسی شیمی، دانشگاه یاسوج
2 دانشیار مهندسی شیمی، دانشگاه یاسوج
چکیده
وجود فسفات در آبهای آلوده یکیاز مهمترین مشکلات زیستمحیطی است. هدف این مطالعه، حذف فسفات از پساب شهری به‌وسیلۀ کامپوزیت سهجزئی کیتوزان پوستۀ میگو/ کربن فعال/ نانوذرات آهن سنتزشدهبا روش سونوشیمیایی بود. کیتوزان از پوستۀ میگو باروش سونوشیمیایی سنتزشد و سپس، بااستفادهاز کربن فعالشدۀ پوست پرتقال با سنتز کامپوزیت سهجزئی کیتوزان/ کربن فعال/ نانوذرات آهن (1CACIC) اصلاحشد. شناسایی گروه‌های عاملی کامپوزیت، ریخت‌شناسی سطح و منافذ آن و خواص تخلخل با شگرد‌های FTIR، SEM و BET بررسیشد. اثر pH محلول(6-1)، مقدار جاذب (0/15-0/05 گرم) و غلظت آلاینده (mg/L 100-20) بر عملیات جذب بررسیشد و شرایط عملیاتی بهینه بااستفادهاز طرح مرکب مرکزی تعیینشد. الگوهای جنبشی شبه درجۀ اول، شبه درجۀ دوم، نفوذ درونذره و بوید برای به تصویرکشیدن داده­های جنبشی و همچنین، ایزوترمهای فروندلیچ، لانگمویر، و دوبینین- رادوشکویچ برای تحلیل تعادل داده­های جذب استفادهشد. نتایج نشانداد که جذب سینتیک شبه درجۀ دوم را تأییدمیکند (R2=1). همچنین، در بین ایزوترمهای مورد مطالعه، الگوی لانگمویر بهخوبی جذب فسفات روی کامپوزیت را توصیفکرد (0/9996=R2) و حداکثر ظرفیت جذب 312/5 میلیگرمبرگرم کامپوزیت بود. pH بهینۀ جذب فسفات 5/92 بود. میزان فسفات جذبشده‌باCACIC  در شرایط بهینه برابربا mg/g 97/05 به‌دستآمد. بهطور کلی، میتوانگفت که کامپوزیت کیتوزان/ کربن فعال پوست پرتقال/ نانوذرات آهن عملکرد خوبی در فرایند جذب یون فسفات در فرایند جذب ناپیوسته دارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Modified Shrimp-Shell Chitosan: Synthesis, Characterization and Application for Phosphate Removal from Wastewater

نویسندگان English

Kh. Amirsadat 1
H. Sharififard 2
A. lashanizadegan 2
1 MSc. in Chemical Engineering, Yasouj University
2 Associate Professor of Chemical Engineering, Yasouj University
چکیده English

Phosphate removal from polluted waters is one of the most important environmental problems. This study aimed to remove phosphate from municipal wastewater by a ternary composite of shrimp shell- chitosan/activated carbon/iron nanoparticles synthesized via the sonochemical method. Chitosan was synthesized from shrimp shell via sonochemical method and then modified using orange peel-activated carbon via synthesis of a ternary composite of chitosan/activated carbon/iron nanoparticles (CACIC). Identification of the composite functional groups, the morphology of its surface and pores, and porosity properties were investigated by FTIR, SEM, and BET techniques.
The effect of solution pH (1-6), adsorbent amount (0.05-0.15 g), and pollutant concentration (20-100 mg/L) on the adsorption operation was investigated and the optimal operating conditions were determined using the Central Composite Design (CCD). Pseudo-first-degree, pseudo-second-degree, intra-particle diffusion, and Boyd kinetic patterns were utilized to portray the kinetic data, as well as the Langmuir, Freundlich, and Dubinin-Radushkevitch isotherms to describe the adsorption equilibrium data. The results offered that the adsorption confirmed the pseudo-second-degree kinetics (R2=1). Also, among the studied isotherms, the Langmuir pattern described well the phosphate adsorption upon the composite (R2=0.9996) and the maximum adsorption valence was 312.5 mg of phosphate /g composite. The optimum pH of phosphate uptake was 5.92.
The amount of phosphate adsorbed by CACIC under optimal conditions was 97.05 mg/g. In general, it can be said that the composite of chitosan/orange peel-activated carbon/iron nanoparticles performs well in the process of phosphate ion adsorption in discontinuous adsorption.

کلیدواژه‌ها English

Phosphate
Chitosan
Activated Carbon
Domestic Wastewater
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