حذف کرومات از پساب صنعتی با استفاده از نانو ذره سیلیکون

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد مهندسی بهداشت محیط و عضو کمیته تحقیقات دانشجویی دانشگاه علوم پزشکی کرمان، عضو باشگاه پژوهشگران جوان، دانشگاه آزاد اسلامی، واحد تبریز، تبریز، ایران

2 کارشناسی ارشد شیمی تجزیه، مربی دانشکده شیمی، دانشگاه اصفهان

3 دانش‌آموخته کارشناسی ارشد مهندسی بهداشت محیط و عضو کمیته تحقیقات دانشجویی دانشگاه علوم پزشکی کرمان، عضو باشگاه پژوهشگران جوان، دانشگاه آزاد اسلامی، واحد اردستان، اردستان، ایران

4 استاد مرکز تحقیقات بهداشت محیط و گروه مهندسی بهداشت محیط، دانشگاه علوم پزشکی کرمان

چکیده

کروم شش ظرفیتی یکی از آلاینده‌های خطرناک در آب‌های سطحی و زیرزمینی است. کروم از طریق فعالیت‌های صنعتی نظیر آبکاری، صنایع تولید رنگ، چرم‌سازی و تولید فلزات وارد بسترهای آبی می‌شود. هدف از این تحقیق حذف کرومات از پساب‌های صنعتی با استفاده از نانو ذره سیلیکون بود. مطالعه از نوع تجربی- آزمایشگاهی بود و آزمایش‌ها بر روی فاضلاب سنتتیک شبیه‌سازی شده و همچنین بر روی فاضلاب واقعی انجام گرفت. متغیرهای مختلفی نظیر pH، زمان تماس، غلظت‌های مختلف کروم و غلظت‌های مختلف SiO2 اندازه‌گیری شد. نتایج با نرم افزار Excelو SPSS نسخه 16 تحلیل شد. میزان حذف کروم با کاهش pH و افزایش زمان تماس افزایش یافت. بیشترین حذف کروم در pH برابر 3 و زمان تماس 120 دقیقه بود. کارایی حذف با افزایش غلظت کروم کاهش یافت. با افزایش غلظت جاذب به بیش از 1 گرم در لیتر، در کارایی حذف تأثیری مشاهده نشد. داده‌هایتعادلی مطابق مدلایزوترمیفروندلیچ وسینتیکفرایند جذبمنطبق بامدلشبهدرجه2بود. نانو ذره سیلیکون توانایی بالایی در حذف کروم داشت. با توجه به حذف 96 درصدی کروم در شرایط بهینه، پارامترهای مورد بررسی و میزان حذف 6/88 درصد در نمونه واقعی، می‌توان، روش مذکور را به‌عنوان یکی از روش‌های کارآمد برای حذف کروم در فاضلاب‌ صنایعمطرح نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Removal of Chromium from Industrial Wastewater Using Silicon Nanoparticle

نویسندگان [English]

  • Laleh Ranandeh Kalankesh 1
  • Samira Alikhasi 2
  • fatemeh mansuri 3
  • Mohammad malakootian 4
چکیده [English]

Hexavalent chromium is a pollutant found in surface and underground waters that causes serious environmental hazards. Chromium enters water as a result of industrial activities such as electroplating, dyeing, leather tanning, and metal manufacturing. The objective of the present laboratory-experimental study was to remove chromate from industrial effluents using silicon nanoparticles. The experiments were performed with both simulated synthetic wastewater and true wastewater. Various parameters such as pH, contact time, and different concentrations of Cr(VI) and SiO2 were examined. The data obtained were analyzed using the Excel and SPSS Ver. 16. It was found that Cr(VI) removal increased with decreasing pH and increasing contact time. The highest Cr(VI) removal was achieved at pH=3 and a contact time of 120 minutes. It was also observed that removal observed to obey the Langmuir isotherm and pseudo second-order kinetic models, respectively. The findings indicate that silicon nanoparticles are capable of removeing Cr(VI) from industrial effluents. Given the Cr(VI) removal efficiency of 93.6% achieved under optimum conditions and  the removal efficiency of 88.6% achieved in real samples, the method may be recommended as a highly efficient one for removing Cr(VI) from industrial wastewaters.

کلیدواژه‌ها [English]

  • Chromium
  • Industrial Wastewaters
  • Silicon Nanoparticle
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