حذف 2 و 4 دی‌کلروفنل از محیط‌های آبی با استفاده توام از فرایند فتوکاتالیستی UV-LED/TiO2

نوع مقاله: مقاله پژوهشی

نویسندگان

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

2 دانشیار گروه مهندسی بهداشت محیط، مرکز تحقیقات عوامل اجتماعی مؤثر بر سلامت، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، همدان، ایران

چکیده

2 و 4 دی‌کلروفنل یکی از فراوان‌ترین و رایج‌ترین آلاینده‌هایی است که به‌طور گسترده در پساب صنایع مختلف یافت می‌شود. میزان تجزیه این آلاینده قبل از تخلیه فاضلاب به آب‌های پذیرنده اثرات متفاوتی بر سلامت و محیط زیست دارد. از این رو در این پژوهش حذف 2 و 4 دی‌کلروفنل از محیط‌های آبی با استفاده از فرایند UV-LED/TiO2 مورد بررسی قرارگرفت. در این مطالعه تجربی، حذف 2 و 4 دی‌کلروفنل با استفاده از اشعه ماوراء بنفش LED در حضور TiO2 در یک راکتور با مقیاس آزمایشگاهی بررسی شد. تأثیر پارامترهای بهره‌برداری از جمله pH محلول، در بازه 3 تا 11، غلظت اولیه 2و4 دی‌کلروفنل 50 تا 200 میلی‌گرم‌ در لیتر، غلظت TiO2 003/0 تا 025/0 مول بر لیتر و تأثیر شدت یونی بررسی شد. غلظت نهایی ماده آلی با استفاده از دستگاه اسپکتروفتومتری
DR 5000 در طول موج 500 نانومتر تعیین شد. نتایج این پژوهش نشان داد که حذف 2 و4 دی‌کلروفنل تحت تأثیر پارامترهای مختلف بهره‌برداری بوده و بیشترین کارایی حذف در pH برابر 3 با اضافه کردن 012/0 مول در لیتر دی اکسید تیتانیم و در غلظت اولیه 50 میلی‌گرم در لیتر ماده آلی و به میزان 82/95 درصد به‌دست آمد. در استفاده مجزا از UV-LED و TiO2 کارایی حذف  به‌ترتیب 11/32 و 56/36 درصد بود. همچنین، حداکثر کارایی حذف COD در شرایط بهینه بهره‌برداری 5/71 درصد به‌دست آمد و نتایج بیانگر عدم تأثیر‌گذاری به‌ تغییرات شدت یونی در حذف ماده آلی بود. نتایج این پژوهش نشان داد که فرایند ترکیبی UV-LED/TiO2 در شرایط بهینه بهره‌برداری، امکان استفاده به‌عنوان یک فناوری نوظهور به‌منظور تصفیه فاضلاب‌های صنعتی حاوی 2 و 4 دی‌کلروفنل را دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

2, 4-Dichlorophenol Removal from Aqueous Solution by Continuous Using of UV-LED/TiO2 Photocatalytic Process

نویسندگان [English]

  • Sona Chavoshi 1
  • Gorban Asgari 2
  • Abdolmotaleb Seid-mohammadi 2
1 MSc Student in Environmental Health Engineering, Faculty of Health, Hamadan University of Medical Sciences, Hamadan, Iran
2 Assoc. Prof., Department of Environmental Health Engineering, Social Determinants of Health Research Center, Faculty of Health, Hamadan University of Medical Sciences, Hamadan, Iran
چکیده [English]

2, 4-Dichlorophenol is one of the most common and abundant pollutants widely found in various industrial effluent. The obvious effect of this organic compound on health and environment depends on enhancing the degradation efficiency of this aqueous pollutant before wastewater being discharged into the receiving water. Therefore, in this study, removal of 2, 4-dichlorophenol from aqueous solution was investigated through using UV-LED/TiO2 process. In this experimental study, removal of 2, 4-DCP in the presence of TiO2 by using UV-LED in a bench scale reactor was examined. The effects of operational parameters such as pH (3-11), initial concentration of 2, 4-DCP (50-200mg/L), TiO2 concentration (0.003-0.025mol/L) and ionic strength were evaluated. The results indicated that removal of 2, 4-DCP was influenced by different operational parameters. The highest 2, 4-DCP removal rate were obtained at pH=3 by adding 0.012 mol/L of TiO2 to solution with an initial concentration of 50mg/L of 2, 4-DCP which more than 95.82% of 2, 4-DCP was removed. While UV-LED and TiO2 were used separately, the 2, 4-DCP removal efficiency was 32.11% and 36.56%, respectively. Also, the results indicated that maximum COD removal rate was 71.5% in optimum condition and also indicated lack of impact on ionic strength changes for removal of organic material. The results indicated that combined TiO2/UV-LED process in optimal conditions can be used as a new technology for treatment of various industrial wastewater containing 2, 4-DCP.

کلیدواژه‌ها [English]

  • UV-LED
  • TiO2
  • 2
  • 4-Dichlorophenol
  • Aqueous solution

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