نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، مهندسی بهداشت محیط، گروه مهندسی بهداشت محیط، دانشکدة بهداشت و عضو مرکز تحقیقات فناوری‌های زیست‌محیطی، دانشگاه علوم پزشکی جندی‌شاپور اهواز، اهواز، ایران

2 استاد، مهندسی بهداشت محیط، گروه مهندسی بهداشت محیط، دانشکدة بهداشت و عضو مرکز تحقیقات فناوری‌های زیست‌محیطی، دانشگاه علوم پزشکی جندی‌شاپور اهواز، اهواز، ایران

3 کارشناس‌ارشد، مهندسی بهداشت محیط، گروه مهندسی بهداشت محیط، دانشکدة بهداشت، دانشگاه علوم پزشکی جندی‌شاپور اهواز، اهواز، ایران

چکیده

اهداف کروم شش ظرفیتی یکی از فلزات سنگین دارای سمیت بهداشتی و محیط‌زیستی است که از طریق فاضلاب‌های صنعتی وارد منابع پذیرندة آبی می‌شود. هدف از پژوهش فعلی تعیین کارایی زئولیت کلینوپتیلولایت تهیه‌شده از معادن واقع در جنوب شرق سمنان در حذف کروم شش ظرفیتی از محلول آبی سنتتیک بود.
مواد و روش‌هاپس از اصلاح زئولیت به روش شیمیایی، متغیرهای pH در محدودة 2-10، دوز جاذب در محدودة 2-20 گرم بر لیتر، زمان‌ماند در محدودة 5-150 دقیقه و غلظت کروم شش ظرفیتی در محدودة 10-50 میلی‌گرم بر لیتر به روش یک عامل در زمان مطالعه شد. همچنین، همبستگی داده‌ها با ایزوترم‌ها و سینتیک‌های جذب بررسی شد.
یافته‌هادر سطوح بهینة pH معادل دو، زمان واکنش سی دقیقه، دوز جاذب 8 گرم بر لیتر و غلظت اولیة کروم شش ظرفیتی 10 میلی‌گرم بر لیتر بیشترین بازدة حذف معادل 53/99 درصد مشاهده شد. ایزوترم فروندلیچ و سیتیک شبه درجة دوم بیشترین همبستگی را با داده‌های تجربی داشت.
نتیجه‌گیرینتایج حاصل از پژوهش فعلی در مقیاس آزمایشگاهی نشان می‌دهد که زئولیت طبیعی کلینوپتیلولایت جاذب کارآمدی برای حذف کروم شش ظرفیتی از محلول‌های آبی است.

کلیدواژه‌ها

عنوان مقاله [English]

Removal of Cr(VI) from Aqueous Solutions Using Semnan Natural Clinoptilolit Zeolite

نویسندگان [English]

  • Sahand Jorfi 1
  • Nematallah Jafarzadeh Haghighifard 2
  • Mohammad Javad Ahmadi 3
  • Narjes Shaheidar 3
  • Hakimeh Purhoseini 3

1 Assistant Proffesor, Department of Environmental Health Engineering, School of Health, Ahvaz Judishapur University of Medical Sciences, Ahvaz, Iran

2 Proffesor, Department of Environmental Health Engineering, School of Health, Ahvaz Judishapur University of Medical Sciences, Ahvaz, Iran

3 M.Sc. of Environmetal Health, School of Health, Ahvaz Judishapur University of Medical Sciences, Ahvaz, Iran

چکیده [English]

Background & Objectives: Cr(IV) is a toxic heavy metal with dangerous effects on health and environment and is discharged through industrial effluents. The main aim of the current study was to determine the efficiency of natural zeolite on removal Cr(IV) from aqueous solutions.
Materials & Methods: Following the chemical modification of Zeolite, the study variables including pH (2-10), adsorbent dosage (2-20 g/L), reaction time (5-150 min) and Cr(IV) concentration (10-50) were optimized according to the one at the time experimental design. The correlation of obtained data with conventional isotherms and kinetics were also studied.
Results: In optimum pH 2, reaction time of 30 min and adsorbent dosages of 8 g/L, the most removal efficiency of 99.53% was observed for initial Cr(IV) concentration of 10 mg/L. The Freundlich isotherm and pseudo –second order kinetics were better fitted to the findings.
Conclusions:According to findings of current study in lab scale, it can be concluded that natural Zeoliite can be considered as an efficient and cost effective alternative on treatment of effluents containing Cr(IV).

کلیدواژه‌ها [English]

  • adsorption
  • clinoptilolite zeolite
  • Cr(IV)
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