بررسی جذب یون‌های روی، کادمیم و سرب با کیتین استخراج شده از شاه میگو دریای عمان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه شیمی، دانشکده علوم، دانشگاه سیستان و بلوچستان، زاهدان، ایران

2 دانش‌آموخته کارشناسی ارشد گروه شیمی، دانشگاه علوم، دانشگاه سیستان و بلوچستان، زاهدان، ایران

چکیده

پوسته شاه میگو به‌منظور استخراج کیتین در مهرماه 1381 از بندر کنارک جمع‌آوری، خالص سازی و خشک شد. استخراج کیتین از پوسته با روش‌های مرسوم شیمیایی طی مراحل کانی‌زدایی، حذف مواد پروتئینی و مواد رنگی انجام شد. پوسته توسط اسید استیک و کلرید سدیم یک درصد خالص سازی شد که دارای 12 درصد کیتین خالص است. شناسایی و تعیین ساختار ملکولی کیتین حاصله با روش‌های طیف سنجی مادون قرمز و پراش اشعه ایکسBET  و تجزیه عنصری دستگاهی انجام شد. طیف FT-IR کیتین استخراج شده با طیف FT- IR استاندارد مرک کاملاً مطابقت داشت. کیتین یک پلیمر خطی n- استیل کلوگز امین است که یون‌های فلزی می‌توانند روی این گروه‌ها جذب شوند. بررسی سینتیکی واکنش کیتین با یون روی نشان داد که زمان تعادل جذب شش ساعت است. ایزوترم‌های جذب لانگمیر برای یون‌های سرب، روی و کادمیم با غلظت اولیه 3- 10 × 2 مولار در pHهای مختلف و قدرت یونی 002/0 مولار و دمای اتاق با روش نیمه پیوسته ظرفی تهیه شد. بیشترین مقدار یون‌های فلزی جذب شده روی کیتین در pH برابر 75/6 برای کادمیم، 119/0، مول بر کیلوگرم و 2+ برای روی، 714/0 مول بر کیلوگرم و +2 برای سرب، 630/1 مول بر کیلوگرم می‌باشد. نمودارهای مقادیر تعادلی یون‌های فلزی و جذب شده روی کیتین نسبت به pH نشان می‌دهند که ظرفیت جذب کیتین به pH ، زمان واکنش، غلظت یون فلزی، و اندازه ذرات کیتین بستگی دارد. بنابراین کیتین به‌عنوان یک پلیمر طبیعی غیر سمی می‌تواند در سم‌زداییآب به‌علت وجود یون‌های فلزی سنگین به‌کار رود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study of Zn, Cd, and Pb Adsorption Using Chitin Extracted from Lobsters from Oman Sea

نویسندگان [English]

  • Alireza Sardashti 1
  • Hosseinali Badin 2
1 Assoc. Prof. of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran
2 . MSc Graduate of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran
چکیده [English]

Lobster shells from Konarak Port were collected in October 2002, purified, and dried for the purposes of the present study. Chitin was extracted from the shellsusing the common chemical processes of demineralization, proteinzation, and decolonization, beforepurificationwith 1% CH3COOH and 1% NaCl to obatin an extract containing 12% (w/w) chitin. Chitin composition was determined using FT-IR, X-Ray powder diffraction, BET, and C.H.N.S analysis. The FT-IR spectrum of the extracted chitin was corresponded well to the Merck standard one, indicating that it is a linear polymer of N-acetyl-D- glucosamine on which metal ions can be adsorbed. Kinetic study of chitin’s reaction with Zn+2 at pH=6.75 and an ionic strength of 0.02 M indicated that adsorption equilibrium was reached within six hours of mixing. Adsorption Langmuir isotherms for a solution of Zn+2, Cd+2, and Pb+2 ions at an initial concentration of 2×103 M were determined for an ionic strenght of 0.02 M, different pH levels, and at ambient temparature using the discontinued in-pot method. The maximum amounts of metal ions adsorbed on chitin at pH= 6.75 were measured to be 0.119 mol/kg for Cd+2, 0.714 mol/kg for Zn+2, and 1.630 mol/Kg for Pb+2. The overdyeing graphs, Cs= f (pH), show that the adsorption capacity of chitin is influenced by such factors as pH, reaction time, metal ion concantration, and adsorbent particle size. Thus, chitin as a non-toxic natural polymer may be highly recommended for water detoxification from heavy metal ions.

کلیدواژه‌ها [English]

  • Shells of Lobster
  • Extracted Chitin
  • Adsorption of Metal Ions
  • BET
  • Langmuir Isotherms

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