حذف فلزات سرب و کروم (VI) از آب در سیستم ناپیوسته با استفاده از گاما آلومینای فعال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه علوم و مهندسی محیط‌زیست، دانشکده جغرافیا و علوم محیطی، دانشگاه حکیم سبزواری، سبزوار، ایران

2 دانشیار، گروه علوم و مهندسی محیط زیست، دانشکده جغرافیا و علوم محیطی، دانشگاه حکیم سبزواری، سبزوار، ایران

چکیده

افزایش آلودگی آب به­دلیل تخلیه نامناسب پساب­های شهری و صنعتی به منابع آبی که حاوی فلزات سنگین و سایر آلاینده­ها هستند، به یک مشکل محیط‌زیستی مهم تبدیل‌شده است. ازاین‌رو هدف از این مطالعه، بررسی کارایی گاما آلومینای فعال (AGA) در حذف سرب (II) و کروم (VI) از آب است که برای سنتز آن، از هیدرات آلومینیوم استفاده‌شده است. اثر متغیرهایی مانند pH، زمان تماس، مقدار جاذب، و غلظت اولیه آلاینده­ها که مؤثر در حذف سرب و کروم شش ظرفیتی می­باشند بررسی‌شده است. حداکثر راندمان حذف سرب و کروم شش ظرفیتی توسط AGA در شرایط مقدار جاذب g/l 1، pH معادل 8 برای سرب و معادل 3 برای کروم شش ظرفیتی، غلظت اولیه سرب و کروم شش ظرفیتی mg/l 20 و زمان تماس min 60 به­دست آمد. همچنین بررسی ایزوترم جذب و مدل سینتیکی نشان داد که داده­های فرآیند حذف با مدل لانگمویر (980/0= R2 سرب و 986/0=R2 کروم) و سینتیک شبه مرتبه دوم (991/0=R2 سرب و 953/0= R2 کروم)، همبستگی دارند. بیش­ترین ظرفیت جذب برای سرب و کروم شش ظرفیتی به­ترتیب معادل 78/27 و mg/g 77/30 به­دست آمد. بر اساس نتایج به‌دست‌آمده در مطالعه حاضر، جاذب گاما آلومینای فعال از قابلیت بالایی برای حذف سرب و کروم شش ظرفیتی برخوردار است و می­توان آن را به‌عنوان یک جاذب ارزان‌قیمت برای تصفیه پساب­های آلوده به سرب و کروم پیشنهاد کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Removal of Lead and Chromium (VI) metals from Water in the Batch System Using Activated Gamma Alumina

نویسندگان [English]

  • Ghasem Zolfaghari 1
  • Ghasem Zolfaghari 2
  • Safoora Sarnobeh 1
1 M.Sc. Alumni, Department of Environmental Sciences and Engineering, Faculty of Geography and Environmental Sciences, Hakim Sabzevari University, Sabzevar, Iran
2 Assoc. Professor, Department of Environmental Sciences and Engineering, Faculty of Geography and Environmental Sciences, Hakim Sabzevari University, Sabzevar, Iran
چکیده [English]

Increased water pollution has become an important environmental problem due to the discharge of urban and industrial wastewater into water resources that contain heavy metals and other pollutants. Therefore, the aim of this study was to investigate the effectiveness of Activated Gamma Alumina (AGA) in the removal of lead and chromium (VI) from water, for the synthesis of which, aluminum hydrate has been used. Aluminum hydrate was exposed to 700 °C and converted to gamma alumina. The effect of variables such as pH, contact time, adsorbent dose and initial concentration of pollutants that are effective in removing lead (II) and chromium (VI) also investigated. The maximum removal efficiency of lead and chromium (VI) removal was obtained by Activated Gamma Alumina at a dose of 1 g/L, pH equivalent of 8 for lead and equivalent of 3 for chromium (VI), initial lead and chromium (VI) concentration 20 mg/L and contact time 60 min. Also, the study of absorption isotherm and kinetic model showed that the data of the elimination process are correlated with Langmuir model (Lead: R2 = 0.9805 and Chromium: R2 =0.9865) and kinetic of the pseudo-second-order models (Lead R2=0.9914 and Chromium R2=0.9536). The maximum adsorption capacity for lead and chromium (VI) obtained 27.78 and 30.77 mg/g, respectively. According to the results obtained in this study, the AGA adsorbent has a high ability to remove lead and chromium (VI) and can be recommended as a cheap adsorbent for the filtration of lead and chromium contaminated backwater.

کلیدواژه‌ها [English]

  • Water Pollution
  • Activated Gamma Alumina (AGA)
  • Lead (II)
  • Chromium (VI)
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