کارایی نانو اکسید تیتانیوم تثبیت شده بر روی بستر بتنی در حذف رنگزای AB113

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس

2 دانشیار گروه مهندسی محیط زیست، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس

3 استاد گروه مهندسی محیط زیست، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس

چکیده

نیمه‌رساناهای با ساختار نانو، نقش مهمی در تشخیص و تخریب آلاینده‌های شیمیایـی مضـر از جمله رنگزاها ایفا می‌کنند. در این تحقیق، پارامترهای مؤثر شامل روش پوشش‌دهی، pH اولیه، غلظت آلاینده، مصرف انرژی، نوع و شدت توان UV در حذف رنگزای‌ آزویی AB113 به‌روش فتوکاتالیستی توسط نانو ذرات اکسید تیتانیوم تثبیت شده بر بستر بتنی مورد مطالعه قرار گرفت. نتایج نشان داد که روش SSP راندمان بالاتری داشته و افزایش غلظت رنگـزا و کاهش pH باعث کاهش نرخ رنگبری می‌شود. بنابر نتایج حاصل، بیش از 92 درصد رنگزای AB113 با غلظت اولیه 75 پی پی ام و به‌ترتیب 17، 7/6 و 3/9 درصد از حلقه‌های بنزنی، نفتالینی و فنلی و نیز 21 درصد TOC، در pH قلیایی 9 توسط 40 گرم بر متر مربع اکسید تیتانیوم پوشش داده شده بر سطح بستر در حضور لامپ UVC 90 وات در کمتر از 5 ساعت حذف شدند.

کلیدواژه‌ها


عنوان مقاله [English]

Efficiency of Immobilized Nano-TiO2 on Concrete Surface in AB113 Removal

نویسندگان [English]

  • Roya Nayebi 1
  • Bita Ayati 2
  • Hossein Ganjdoust 3
چکیده [English]

Semi conductors with nano-structure play an important role in detecting and destroying harmful chemical contaminants such as dye. In this study, the effective parameters including coating method, initial pH, dye concentration, energy consumption, kind and intensity of UV lamp in AB113 dye removal by photo-catalytic process using TiO2 nano-particles immobilized on concrete bed were studied. The results have shown that the Separated Sealer and Photocatalyst (SSP) method had higher efficiency. According to the results, over 92 percent of 75 ppm AB113 and 17, 6.7 and 9.3 percent of  benezylic, naphthalene and phenolic rings and 21 percent of TOC were removed using 40 gr/m2 immobilized TiO2 and 90 W UV-C lamps at pH 9 in less than 5 hours.

کلیدواژه‌ها [English]

  • Azo dye
  • TiO2
  • Nano Particle
  • photocatalyst
  • UV
  • Total Organic Carbon
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