Removal of polycyclic aromatic hydrocarbons (PAHs) from inorganic clay mineral: Bentonite.


Karaca G., Baskaya H. S. , TAŞDEMİR Y.

Environmental science and pollution research international, vol.23, no.1, pp.242-52, 2016 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 1
  • Publication Date: 2016
  • Doi Number: 10.1007/s11356-015-5676-z
  • Journal Name: Environmental science and pollution research international
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.242-52
  • Keywords: UV, Photodegradation, Evaporation, TiO2, Diethylamine, SEWAGE-SLUDGE, SOIL SURFACES, UV-LIGHT, WASTE-WATER, PHOTOCATALYTIC DEGRADATION, ORGANOCHLORINE PESTICIDES, AUTOMOTIVE INDUSTRY, SIMULATED SUNLIGHT, ORGANIC POLLUTANTS, CONTAMINATED SOIL
  • Bursa Uludag University Affiliated: Yes

Abstract

There has been limited study of the removal of polycyclic aromatic hydrocarbons (PAHs) from inorganic clay minerals. Determining the amount of PAH removal is important in predicting their environmental fate. This study was carried out to the degradation and evaporation of PAHs from bentonite, which is an inorganic clay mineral. UV apparatus was designed specifically for the experiments. The impacts of temperature, UV, titanium dioxide (TiO2), and diethylamine (DEA) on PAH removal were determined. After 24 h, 75 and 44 % of Sigma(12) PAH in the bentonite were removed with and without UV rays, respectively. DEA was more effective as a photocatalyst than TiO2 during UV application. The Sigma(12) PAH removal ratio reached 88 % with the addition of DEA to the bentonite. It was concluded that PAHs were photodegraded at high ratios when the bentonite samples were exposed to UV radiation in the presence of a photocatalyst. At the end of all the PAH removal applications, higher evaporation ratios were obtained for 3-ring compounds than for heavier ones. More than 60 % of the amount of Sigma(12) PAH evaporated consisted of 3-ring compounds.