مهندسی شیمی ایران

مهندسی شیمی ایران

استفاده‌از بیوجاذب پوست شلغم در حذف کروم (VI) از آب

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد مهندسی شیمی، دانشگاه کردستان
2 دانشجوی کارشناسی ارشد مهندسی شیمی، دانشگاه صنعتی سهند
3 دانشیار مهندسی شیمی، دانشگاه کردستان
چکیده
کروم (VI) به‌وسیلۀ پساب‌های صنایع رنگ، دباغی و آبکاری وارد منابع آب می‌شود. کروم (VI) در آب، آلاینده‌ای خطرناک و سرطان‌زا است. در این‌ کار، برای حذف کروم (VI) از آب، از روش جذب سطحی و بیوجاذب پوست شلغم استفاده شد. تصاویر SEM، ساختار متخلخل پوست شلغم را نشان دادند. مساحت سطح ویژۀ پوست شلغم 4/436m2/g  اندازه‌گیری شد. اثر شرایط عملیاتی شامل غلظت (از 5 تا mg/L 20) و pH اولیۀ محلول کروم (VI) (از 2pH  تا 10)، مقدار جاذب (از 10 تا 30g/L )، زمان (از 0 تا دقیقه 150) و دما ( از 25 تا85 درجه سلسیوس ) بررسی شدند. ایزوترم جذب سطحی با مدل لانگمویر مطابقت داشت و حداکثر ظرفیت جذب سطحی برابر با 14/45mg/g  در pH برابر با 5 تعیین شد. در شرایط عملیاتی مقدار غلظت10 میلی گرم بر لیتر، pH برابر با 5، مقدار جاذب 20g/L، زمان دقیقه 60، و دمای 25 درجه سلسیوس  مقدار حذف کروم (VI) معادل 78/36% به‌دست آمد، با افزایش دما (تا حدود 85 درجه سلسیوس) یا کاهش pH ( pH برابر با 2) حذف کامل کروم (VI) به‌دست آمد. هزینۀ اندک، ظرفیت جذب سطحی بزرگ و زمان کوتاه برای رسیدن به تعادل، برتری‌های اصلی بیوجاذب پوست شلغم هستند و توانایی خوب بیوجاذب‌ها را که معمولاً از ضایعات کشاورزی تهیه می‌شوند در حذف آلاینده کروم (VI) از آب نشان می‌دهند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Use of Turnip Peel Bioadsorbent to Remove Chromium (VI) from Water

نویسندگان English

A. Moradizdeh 1
M. M. Malek Mohammadi 2
F. Akhlaghian 3
1 M. Sc. Student of Chemical Engineering, University of Kurdistan
2 M. Sc. Student of Chemical Engineering, Sahand University of Technology
3 Associate Professor of Chemical Engineering, University of Kurdistan
چکیده English

Cr (VI) enters water resources via wastewaters of pigment, tanning, and plating industries. Cr (VI) in water is a dangerous pollutant and carcinogenic. In this work, turnip peel bioadsorbent was used to remove Cr (VI) from water. The SEM images showed porous structure of turnip peel. The specific surface area of turnip peel was measured 4.436 m2/g. The effects of the operating conditions including Cr (VI) solution initial concentration (5 to 20 mg/L) and pH (2 to 10), bioadsorbent dose (10 to 30 g/L), time (0 to 150 min), and temperature (25 to 85°C) were investigated. Adsorption isotherm corresponded to Langmuir model and maximum adsorption capacity was 14.45 mg/g at pH of 5. Cr (VI) removal of 78.36% was obtained in the operating conditions of initial Cr (VI) concentration of 10 mg/L, pH of 5, time of 60 min, and temperature of 25°C. Complete removal of Cr (VI) was reached with increase of temperature (to 85°C) or decrease of pH (to pH of 2).
The main advantages of turnip peel bioadsorbent are the low cost, large adsorption capacity, and short time to reach equilibrium and shows the ability of bioadsorbents which usually are from agricultural wastes to remove Cr (VI) from water.

کلیدواژه‌ها English

Adsorption
Chromium (VI)
Bioadsorbent
Wastewater Treatment
Turnip Peel

 

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