Photocatalytic removal of phenol using supported nano-TiO2 doped with lanthanum
| dc.contributor.author | Muhammed Ahshath A. Jamal Muhammed | |
| dc.date.accessioned | 2021-04-16T03:16:37Z | |
| dc.date.available | 2021-04-16T03:16:37Z | |
| dc.date.issued | 2015-05-01 | |
| dc.description.abstract | Titanium dioxide (TiO2), plays a main role in this treatment due its special characteristics such as inert, non- toxic and also very stable. However, some modifications have to be done to improve its limitation. Commercial TiO2, Degussa P25 photocatalyst was modified by doping with lanthanum using wet impregnation method and immobilized onto silica gel. It has been successfully synthesized in order to degrade chosen organic pollutant, phenol, effectively under UV light using a batch reactor system. The photocatalyst has been characterized using Scanning Electron Microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), UV-Vis spectroscopy and Fourier Transform Infrared Spectroscopy (FTIR). The modification on TiO2 has enhanced its photoactivity due to change in the energy band gap, electron-hole recombination, crystalline size, surface area and also reusability of the photocatalyst. The best dopant loading of lanthanum is 2.0 mol % (La:Ti) while for silica gel as a support is 3:1 (Ti/Si) weight ratio for the photocatalyst. The photocatalyst is known as 2.0 La-TiO2/ silica gel. The result in phenol photocatalytic degradation was up to 98% compare to commercial TiO2 P25 alone 57.9% within 4 hours using UV A light. The 2.0 La-TiO2/ silica gel also proven to have an excellent reusability after the three time of usage and sedimentation ability. Various operating parameters such as initial phenol concentration, initial phenol pH and also photocatalyst loading dosage were examined. The results showed that the best conditions are as follows: initial concentration of 10 ppm, photocatalyst loading 1.0 g/L, and initial phenol pH 5.3. Kinetic for photocatalytic degradation of phenol also has been studied using Langmuir- Hinshelwood model. Result showed that the reaction kinetic for this study followed pseudo-first order kinetic with k (reaction rate constant) and K (equilibrium adsorption constant) value of 1.149 mg/ L.min and 0.0106 L/ mg respectively. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/12904 | |
| dc.language.iso | en | en_US |
| dc.title | Photocatalytic removal of phenol using supported nano-TiO2 doped with lanthanum | en_US |
| dc.type | Thesis | en_US |
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