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Photocatalytic degradation of humic acid in aqueous solutions

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  1. Tez No: 364556
  2. Yazar: ZEYNEP BOYACIOĞLU
  3. Danışmanlar: DOÇ. DR. MİRAY BEKBÖLET
  4. Tez Türü: Yüksek Lisans
  5. Konular: Çevre Mühendisliği, Environmental Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 1997
  8. Dil: İngilizce
  9. Üniversite: Boğaziçi Üniversitesi
  10. Enstitü: Çevre Bilimleri Enstitüsü
  11. Ana Bilim Dalı: Çevre Teknolojileri Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 185

Özet

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Özet (Çeviri)

Recent interest has been focused on the destructive removal of humic acids in natural waters since these substances are known to be major precursors of carcinogenic disinfection by-products like trihalomethanes produced during chlorination. Various methods have been proposed to control the precursors of trihalomethanes in drinking water. Advanced oxidation processes (AOPs) have been developed in order to achieve complete minerilization of organic compounds. Photocatalytic degradation process usmg semiconducter oxides such as titanium dioxide has gained attention recently. The main mechanism of this process is the generation hydroxyl radical which is known as a the most powerfull and non-selective oxidizing agent. In this study the effects of pH dependent phosphate species on the photocatalyic degradation of humic acid (10 mg L-1) in aqueous medium was investigated. Bench scale experiments, were carried out using titanium dioxide as the photocatalyst and Black Light Fluorescent Lamp as the irradiation source. The degradation was followed in terms of Color436, Color4oo, UV280, UV254 and TOe. In acidic medium, after Ih irradiation time 95% Color436 and 62% TOC were removed with Ti02 concentration of 0.25 mg mL-1 in the absence of phosphate ion whereas in the presence of low concentration of phosphate ions « 0.005 M) the corresponding values were found to be 36% and 24%. In spite of the fact that acidic medium was favorable for the removal of humic acids, 49-79% reduction in the rates of degradation was observed due to the presence of phosphate ions. Increasing phosphate concentration up to fivefold did not affect the degradation rate of humic acid, whereas degradation rates increased with increasing photocatalyst concentrations in the range of 0.25 -l.0 mg mL-1.The decrease in the photocatalytic degradation rates in terms of first order reaction kinetics can be explained by an inhibition effect due to the presence of phosphate species in aqueous medium.

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