نشریه محیط زیست طبیعی

بررسی حذف کروم (VI) از محلول‏‏‏ها‏ی آبی به‌وسیلۀجاذب‏‏‏ ها‏ی معدنی بر پایۀ روش تاگوچی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد دانشکدۀ محیط‌زیست، دانشگاه بیرجند

2 دانشیار دانشکدۀ محیط‌زیست، دانشگاه بیرجند

3 استاد دانشکدۀ شیمی، دانشگاه بیرجند

4 استادیار دانشکدۀ شیمی دانشگاه بیرجند

چکیده

کروم (VI) یکی از فلزات سنگین است که وجود آن در آب و پساب مشکلات فراوانی برای محیط‌‏زیست، موجودات زنده و به­ویژه سلامتی انسان ایجاد می‏کند. در سال‏های اخیر استفاده از جاذب‏‏‏های معدنی به­دلیل ارزان‏بودن، دسترسی و فراوانی آن‏‏‏ها مورد‏ توجه ‏قرار‏گرفته ‏است. هدف از انجام این تحقیق، بررسی حذف کروم(VI)  از محیط آبی و پارامتر‏‏های مؤثر بر آن، با استفاده از برخی جاذب‏‏‏های معدنی با استفاده از روش طراحی آزمایشات تاگوچی است. روش طراحی ‏آزمایش تاگوچی، درهزینه و زمان آزمایشات صرفه‏جویی می‏کند. در این تحقیق، حذف کروم(VI)  از محلول‏‏‏های آبی به وسیلۀ 4 جاذب معدنی پرلیت، پرلیت ‏منبسط، زئولیت و زئولیت اصلاح‏ شده با اسید بررسی شد. تاثیر عوامل دوز جاذب، غلظت کروم (VI) ، زمان تماس، pH و نوع جاذب بر فرایند جذب، در سیستم ناپیوسته با استفاده از روش طراحی ‏آزمایش تاگوچی مورد آزمایش قرار گرفت. جهت طراحی آزمایش از نرم‏افزارDesign Expert (v.8)  و جهت آنالیز داده­‏‏ها از نرم‏افزار Excel استفاده ‏شد. تجزیه تحلیل‏‏‏ها‏ی ایزوترم و سنتیک نیز انجام گرفت. نتایج نشان ‏داد که بهترین جاذب کروم (VI) ، پرلیت‏ منبسط است و شرایط بهینۀ جذب، غلظت mg L-1 1کروم(VI)  ، دوز پرلیت ‏ منبسط   g L-125 و 2 pH= و زمان تماسh 1،  باکارایی % 100 است. ترتیب مشارکت پارامتر‏‏ها در فرایند حذف بدین صورت است:  pH> غلظت > دوز جاذب > زمان > نوع جاذب. پرلیت‏ منبسط توانایی حذف کروم (VI) را از محلول‏‏‏های آبی تحت شرایط تجربی طراحی شده به­وسیلۀ روش تاگوچی دارد. 

کلیدواژه‌ها

عنوان مقاله [English]

Study of Cr (VI) removal from Aqueous solutions by Mineral absorbents by use of Taguchi method

نویسندگان [English]

  • motahare haghi 1
  • q q 2
  • q q 3
  • q q 4

1 q

2 q

3 q

4 q

چکیده [English]

Abstract

Cr (VI) is one of heavy metal that its presence in water and waste water, results in many problems for environment and organisms especially human health. Recently, because of its low cost, availability and abundant, use of mineral adsorbent were considered. The aim of present study was to evaluate Cr (VI) removal from aqueous solutions and investigation of influence of main parameters on removal using of some mineral adsorbent by using of Taguchi experimental design method. Taguchi experimental design method save time and cost of experiments. In this experimental study, Cr (VI) removal from aqueous solutions by 4 mineral absorbent i.e., perlite, expanded perlite, zeolite and acid modified zeolite were investigated. The effect of adsorbent dose, the concentration of Cr (VI), stirring time, pH and type of adsorbent on the adsorption process were examined using Taguchi experimental design in batch extraction mode. Design Expert (v.8) and Microsoft Excel were used for experimental design and statistical analysis, respectively. Isotherm and kinetic analysis were performed. The results showed that the best adsorbent for Cr (VI) removal was expanded perlite. Optimal conditions for adsorption were Cr (VI) concentration 1ppm, expanded perlite dose 25g L-1,1h shaking time and pH 2 with 100% extraction efficiency. Percent Parameters contribution most to least is as follows: pH, Cr (VI) concentration, adsorbent dose, shaking time and type of adsorbent. Expanded perlite, has the ability of Removal of Cr (VI) under the obtained conditions experimentally designed by Taguchi method.

کلیدواژه‌ها [English]

  • Removal
  • Cr (VI)
  • Mineral absorbents
  • aqueous solution
  • Taguchi experimental design method
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نشریه محیط زیست طبیعی
دوره 70، شماره 3
آذر 1396
صفحه 549-563