An In-Situ DRIFTS/MS Study of the Photocatalytic Degradation of EDTA over TiO2

Student thesis: Master's Thesis

Abstract

Among the various applications of photocatalysis, this research focuses on the photocatalytic degradation of Ethylenediaminetetraacetic acid (EDTA) over TiO2. The study investigates the reaction under different operational parameters. The objective is to determine the best conditions for the reaction to take place efficiently. The degradation has been studied in-situ using a DRIFTS-MS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy – Mass Spectroscopy) hyphenated system, with the reaction taking place inside a reaction cell exposed to radiation from lamps simulating solar or UV-visible broad range radiation to assess the influence of radiation on performance. Other factors, such as the reactant gas, the presence of humidity and the amount of EDTA loading on the surface of TiO2, were manipulated and studied individually as well. Degusa (Evonik) P25 is the Titania catalyst used in this study. The results showed that Oxygen as a reactant gas was essential for the photodegradation to take place by oxidizing EDTA. As for the level of humidity, 30% of relative humidity (RH) showed to be a good intermediate amount in a range between 0% and 80%. Among the three amounts of EDTA loadings on 1 g of P25, the least amount of 2 mg EDTA was found the best to recognize the results of degradation. The 500 W Xe-Hg lamp was found to be too powerful for the purpose of this stud. Reducing the intensity of irradiation by using the less powerful 300 W solar simulating Xe lamp was found to be more efficient in assessing the degradation reaction.
Date of AwardJul 2018
Original languageAmerican English

Keywords

  • Photocatalysis
  • Ethylenediaminetetraacetic acid (EDTA)
  • radiation performance
  • biologicald Degradation.

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