استفاده از فرایند اکسیداسیون پیشرفته UV/TiO2/H2O2 در حذف نفتالین از آب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی گروه مهندسی بهداشت محیط، دانشگاه علوم پزشکی اراک، اراک

2 کارشناس آزمایشگاه شیمی محیط زیست، دانشگاه علوم پزشکی اراک، اراک

چکیده

نفتالین در اثر سوختن مواد آلی از قبیل سوخت‌های فسیلی و چوب، صنایع و انتشار از اگزوز خودرو‌ها وارد محیط زیست می‌شود. نفتالین در ساخت پلاستیک، رزین، سوخت و رنگ‌ها استفاده می‌شود. این پژوهش با هدف ارزیابی عملکرد فرایند UV/TiO2/H2O2در تجزیه نفتالین از محلول آبی انجام شد. تجزیه فوتوکاتالیستی نفتالین، توسط تابش نور UV در حضور TiO2 و H2O2 تحت شرایط گوناگون بررسی شد. تجزیه نوری فرایندهای H2O2/UV، TiO2/UV و H2O2/TiO2/UV در یک راکتور بسته با تابش لامپ کم‌فشار جیوه‌ای مقایسه شد. اثر پارامترهای بهره‌برداری نظیر زمان واکنش، pH محلول، نفتالین اولیه، غلظتTiO2  و H2O2 در فرایند تجزیه فوتوکاتالیستی مورد بررسی قرار گرفتند. در غلظت 15 میلی‌گرم در لیتر نفتالین و زمان‌های ماند 5، 10، 20،30، 40، 50، 60، 100 و 120 دقیقه، راندمان حذف نفتالین به ترتیب برابر با 63، 75، 80، 88، 92، 95، 5/96و 98 درصد به ترتیب در سیستمUV/TiO2/H2O2  و 50، 5/59، 69، 80، 85، 88، 91 و 95 درصد در سیستم UV/TiO2 به‌دست آمد. در pH اولیه 3، 4، 5، 6، 7، 9، 10 و 12، به‌طور تقریبی راندمان حذف نفتالین به‌ترتیب 8/96، 5/85، 86، 5/75، 8/68، 8/57 و 5/52 درصد، با سیستم UV/TiO2/H2O2 حاصل شد. نشان داده شد که تجزیه نوری با استفاده از فرایند H2O2/TiO2/UV بسیار مؤثرتر از استفاده هر دو فرایند H2O2/UV یا فرایندTiO2/UV است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Application of UV/TiO2/H2O2 Advanced Oxidation to Remove Naphthalene from Water

نویسندگان [English]

  • Behroz Karimi 1
  • Mohammadsadegh Rajaei 1
  • Mehri Eesvand 2
  • Maryam Habibi 2
1 Faculty Member of Environmental Health Engineering, Faculty of Public Health, Arak University of Medical Sciences, Arak
2 Lab. Instructor of Environmental Chemistry, Arak University of Medical Sciences, Arak
چکیده [English]

Naphthalene is released into the environment by burning such organic materials as fossil fuels and wood and in industrial and vehicle exhaust emissions. Naphthalene is used in the manufacture of plastics, resins, fuels, and dyes. The aim of this study was to evaluate the performance of UV/TiO2/H2O2 process to decompose naphthalene in aqueous solutions. For this purpose, the photocatalytic degradation of naphthalene was investigated under UV light irradiation in the presence of TiO2 and H2O2 under a variety of conditions. Photodegradation efficiencies of H2O2/UV, TiO2/UV, and H2O2/TiO2/UV processes were compared in a batch reactor using the low pressure mercury lamp irradiation. The effects of operating parameters such as reaction time (min); solution pH; and initial naphthalene, TiO2, and H2O2 concentrations on photodegradation were examined. In the UV/TiO2/H2O2 system with a naphthalene concentration of 15 mg/L, naphthalene removal efficiencies of 63, 75, 80, 88, 92, 95, 96.5, and 98% were achieved, respectively, for reaction times of 5, 10, 20, 30, 40, 50, 60, 100 and 120 min. This is while removal efficienciesof 50, 59.5, 69, 80, 85, 88, 91, and 95% were obtained in the UV/TiO2 system under the same conditions. For initial pH values of 3, 4, 5, 6, 7,9, 10, and 12, naphthalene removal efficiencies of approximately 96.8, 85.5, 86, 75.5, 68.8, 57.8, and 52.5% were acheived, respectively, with the UV/TiO2/H2O2 system. Thus, it may be claiomed that, compared to either H2O2/UV or TiO2/UV process, the H2O2/TiO2/UV process yielded a far more efficient photodegradation.

کلیدواژه‌ها [English]

  • Advanced oxidation processes
  • Aqueous solution
  • H2O2/TiO2/UV
  • Naphthalene

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