[Photocatalytic degradation of gaseous dibenzofuran by TiO2 doped with Fe3+, Ce3+].
The gaseous photocatalytic degradation of dibenzofuran, dioxins-like substance, was investigated by using TiO2, Ce3+/TiOs and Fe3+/TiO2 as photocatalysts. The batch-type photocatalytic reaction experiments were conducted, and the effects of initial concentration of reactant, humidity, circulation flow rate and light intensity on the photocatalytic degradation of dibenzofuran were studied. And the models and methods for estimating photocatalytic reaction constants and Langmuir adsorption constants were proposed. Results showed that the photocatalytic activity of the TiO2 photocatalyst was obviously improved after doping with Fe3+ and Ce3+, and the photocatalytic activity of Fe3+/TiO2 was the best in three photocatalysts. The degradation rate of dibenzofuran increased with the increase of the initial concentration of gaseous dibenzofuran in the batch-type photocatalytic reaction system. The photocatalytic degradation of gaseous dibenzofuran was enhanced when proper quantities of water vapor existed. However, it would be inhibited if there was excessive water vapor. As the circulation flow rate and the light intensity increased, the photocatalytic degradation rate of gaseous dibenzofuran also increased. The photocatalytic reaction rate coefficients of dibenzofuran on the photocatalysts TiO2, Ce3+/TiO2 and Fe3+/TiO2 were 34.54 x 10(-5), 36.23 x 10(-5) and 37.95 x 10(-4) mg x (min x m2)(-1) respectively.
Xia
Qi-Bin
QB
Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, China. qbxia@scut.edu.cn
Huang
Si-Si
SS
Zhang
Zhi-Juan
ZJ
Li
Zhong
Z
D000393:Air Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D001572:Benzofurans / Q000737:chemistry / Q000302:isolation & purification*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D008962:Models, Theoretical; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*
D000393:Air Pollutants; D001572:Benzofurans; D005290:Ferric Compounds; C009495:titanium dioxide; D002563:Cerium; C023614:dibenzofuran; D014025:Titanium