پديد آورندگان :
Eslami A. نويسنده , Nasseri S. نويسنده , Mesdaghinia A. نويسنده , Vaezi F. نويسنده , Nabizadeh R. نويسنده , Yadollahi B. نويسنده
چكيده لاتين :
The oxygenate methyl tert-butyl ether is added to gasoline to increase the octane level and to reduce
carbon monoxide and hydrocarbon emissions by vehicles. The high mobility, water solubility, and
resistance to natural attenuation associated with methyl tert-butyl ether may result in contamination of
ground and surface waters. In this research the degradation of aqueous methyl tert-butyl ether at relatively
high concentrations was investigated by UV-vis/TiO2/H2O2 photocatalytic process. The effect of
important operational parameters such as pH, amount of H2O2, catalyst loading, and irradiation time were
also studied. Concentrations of methyl tert-butyl ether and intermediates such as tert-butyl formate and
tert-butyl alcohol were measured over a 180 min period using a gas chromatograph equipped with flame
ionization detector and combined with headspace sampler. Results showed that the time required for
complete degradation increased from 30 to 180min, when the initial concentration was increased from 10
to 500mg/L. The first order rate constant for degradation of methyl tert-butyl ether from the hydroxyl
radical was estimated to be 0.177 to 0.022 1/min as the concentration increased from 10 to 500mg/L.
Study on the overall mineralization monitored by total organic carbon (TOC) analysis showed that in the
initial concentration of 100mg/L methyl tert-butyl ether, complete mineralization was obtained after
110min under UV-vis/TiO2/H2O2 photocatalytic process.
