بررسی حذف هم‌زمان رنگ راکتیو اورنج 3 آر و کروم از محلول‌های آبی با استفاده ازکربن اصلاح شده حاصل از چوب درخت چنار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی بهداشت محیط، دانشگاه علوم پزشکی سبزوار، سبزوار، ایران

2 دانشیار، گروه مهندسی بهداشت محیط دانشکده بهداشت دانشگاه علوم پزشکی سبزوار، سبزوار، ایران

3 استادیار، گروه مهندسی بهداشت محیط دانشکده بهداشت دانشگاه علوم پزشکی سبزوار، سبزوار، ایران

4 دانشجوی دکتری مهندسی بهداشت محیط، دانشگاه علوم پزشکی سبزوار، سبزوار، ایران

چکیده

زمینه و هدف: امروزه فلزات سنگین و ترکیبات آلی مانند رنگ­ها جز فراوان و پرخطرترین آلاینده­های نوپدید هستند که به آب­های سطحی و زیرزمینی راه پیدا کرده­اند و سلامت انسان­ها را تهدید می­کنند. هدف از این مطالعه، بررسی میزان حذف رنگ راکتیو اورنج 3 آر و کروم در فرایند جذب مجزا و هم‌زمان به‌وسیله کربن فعال می­باشد.
مواد و روش‌ها: در این پژوهش از کربن چنار اصلاح شده با NH4Cl به‌منظور حذف آلاینده‌ها استفاده گردید و تاثیر متغیرهایی از جمله pH (2-9)، غلظت جاذب (5/0-1/0گرم بر لیتر)، غلظت آلاینده (mg/L100-5 ) و زمان تماس (40-2 دقیقه) در حذف رنگ و کروم (هم‌زمان و مجزا) توسط جاذب کربن فعال محاسبه گردید. سپس آزمایش‌های تعادل جذب انجام و ظرفیت جذب و مدل­های ایزوترم جذب فروندلیچ و لانگمویر و سینتیک واکنش­های آن بررسی شد.
یافته‌ها: نتایج این پژوهش نشان داد که کربن­ فعال درpH=4، غلظت 4/0 گرم بر لیتر جاذب در زمان تماس 15 دقیقه بهترین شرایط حذف برای هردو آلاینده رنگ و کروم را داراست. در شرایط بهینه کربن فعال توانست 72 درصد کروم و 84 درصد رنگ در حالت مجزا و 59 درصد کروم و 67 درصد رنگ در حالت هم‌زمان در محلول آلاینده با غلظت mg/L  25 را حذف کند. همچنین بررسی ایزوترم­های جذب مشخص کرد که آزمایش­ها با مدل فروندلیچ مطابقت بیش­تری دارد. سنتیک جذب از معادلات شبه مرتبه دوم تبعیت می­کند.
نتیجه‌گیری: طبق نتایج به‌دست‌آمده، این جاذب، عملکرد مناسبی در حذف مجزا و همزمان رنگ و کروم دارد و می­تواند به‌منظور تصفیه فاضلاب­ حاوی آلاینده­های آلی و معدنی به‌کار رود.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Simultaneous Removal of Reactive Orange 3R and Chromium from Aqueous Solutions Using Modified Carbon from Sycamore Wood

نویسندگان [English]

  • atefeh dehnabi 1
  • ahmad Allahabadi 2
  • MohammadHossein Saghi 3
  • Forough Riahimanesh 4
1 Master's degree Student, Department of Environmental Health Engineering, Sabzevar University of Medical Sciences, Sabzevar, Iran
2 Associate Professor, Department of Environmental Health Engineering, Sabzevar University of Medical Sciences, Sabzevar, Iran
3 Assistant Professor, Department of Environmental Health Engineering, Sabzevar University of Medical Sciences, Sabzevar, Iran
4 Ph.D Student, Department of Environmental Health Engineering, Sabzevar University of Medical Sciences, Sabzevar, Iran
چکیده [English]

Introduction: Today, heavy metals and organic compounds such as dyes are among the most dangerous pollutants that have entered surface and groundwater and threaten human health. The aim of this study was to investigate the removal of reactive orange 3R dye and chromium by adsorption separately and simultaneously activated carbon.
Materials and Methods: In this study, Sycamore carbon modified with NH4Cl was used to remove contaminants.  Effect of variables such as pH (2-9), adsorbent concentration (0.5-1-0 g/L), pollutant concentration (10-50 mg/L) and contact time (2-40 minutes) on dye and chromium removal (simultaneously and separately) were calculated. Freundlich and Langmuir adsorption isotherm models and kinetics were also investigated.
Results: The results of this study showed that activated carbon at pH = 4, 0.4 g/L adsorbent at 15 min contact time has the best removal conditions for both paint and chromium contaminants. Under optimal conditions, activated carbon was able to remove 72% of chromium and 84% of dye separately and 59% of chromium and 67% of dye simultaneously in solution at a concentration of 25 mg/L. The study of adsorption isotherms also showed that the experiments were more consistent with the Freundlich model.The absorption kinetics follows Pseudo-second order equations.
Conclusion: According to the results, this adsorbent has a good performance in separate and simultaneous removal of paint and chromium and can be used to treat wastewater containing organic and inorganic contaminants.

کلیدواژه‌ها [English]

  • adsorption
  • activated carbon
  • chromium
  • dye
  • simultaneous removal
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دوره 29، شماره 4
مهر و آبان 1401
صفحه 531-548
  • تاریخ دریافت: 23 شهریور 1400
  • تاریخ بازنگری: 01 آذر 1400
  • تاریخ پذیرش: 01 آذر 1400
  • تاریخ اولین انتشار: 15 شهریور 1401