| A Comparison Study of Photocatalytic Activity of Fe3O4/TiO2 and Ag/TiO2 on the Degradation of 2, 4-Dichlorophenol |
| Paper ID : 1201-UFGNSM-FULL |
| Authors: |
|
Narjes Esmaeili *1, Azadeh Ebrahimian Pirbazari2, Ziba Khodaee3 1P.O.Box 44951-56468, Eftekhar Alley, Montazeri St, Amlash, Guilan, Iran 2Assistant professor, Fouman Faculty of Engineering, College of Engineering, University of Tehran, Iran 3Assistant Professor, University of Applied Science and Technology, P.O.Box 41635-3697, Guilan, Iran |
| Abstract: |
| Chlorophenols are widely used in several industrial processes, such as fabrication of pesticides, insecticides and wood preservatives. Since they have half-life times in water from 0.6 to 550 h and in sediments up to1700h, they can be found in wastewater, ground-water or soils. Advanced oxidation processes, among them photocatalysis, have been used in recent decades for the degradation of highly persistent and non-biodegradable pollutants in the treatment of wastewater. Herein, pure TiO2 and binary nanocomposites of Ag/TiO2 and Fe3O4/TiO2 were synthesized in order to improve photocatalytic performance of these sample for degradation of 2,4-dichlorophenol (2,4-DCP) as an organic pollutant. A range of analytical techniques including XRD, DRS, SEM/EDX, and elemental mapping were employed to reveal the crystal structure, morphology and property of the nanocomposites. XRD data demonstrated that prepared samples are purely in TiO2 anatase phase and cubic spinel Fe3O4 exist in the synthesized nanocomposite. We calculated the TiO2 crystal size from XRD patterns, in the range of 8.35-11.09 nm. The presence of Ag, Fe, O, and Ti atoms in the synthesized nanocomposites was confirmed by SEM/EDX. We obtained 30.43, 32.02 and 42.40 % degradation of 2,4-DCP (100 ml 2,4-DCP 40 ppm and 0.01 g catalyst) for pure TiO2, Fe3O4/TiO2 and Ag/TiO2, respectively, after 180 min of irradiation under visible light. Similar conditions were employed for 2,4-DCP degradation under UV irradiation, we obtained 53.05, 51.00 and 71.50 % degradation of 2,4-DCP pure TiO2, Fe3O4/TiO2 and Ag/TiO2, respectively. Thus, the synthesized binary nanocomposites exhibited higher photocatalytic activity compared to pure TiO2 under visible light. |
| Keywords: |
| TiO2, binary nanocomposites, TiO2/Ag, TiO2/Fe3O4, Photocatalytic Degradation, 2,4-dichlorophenol |
| Status : Paper Accepted (Poster Presentation) |
