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Factors Affecting the Degradation of Linear Alkylbenzene Sulfonate by TiO2 Assisted Photocatalysis and Its Kinetics |
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| รหัสดีโอไอ | |
| Creator | Anon Jariyanorasade, Suwannee Junyapoon |
| Title | Factors Affecting the Degradation of Linear Alkylbenzene Sulfonate by TiO2 Assisted Photocatalysis and Its Kinetics |
| Publisher | The Thai Society of Higher Education Institutes on Environment |
| Publication Year | 2561 |
| Journal Title | EnvironmentAsia |
| Journal Vol. | 11 |
| Journal No. | 1 |
| Page no. | 45-60 |
| Keyword | degradation products, kinetics, linear alkylbenzene sulfonate, photocatalysis, TiO2 |
| ISSN | 2586-8861 |
| Abstract | This research aims to study photocatalytic degradation of linear alkylbenzene sulfonate (LAS) in synthetic solution and industrial laundry wastewater by UV/TiO2 process. The structural and surface properties of Degussa P25 TiO2 powder were measured by X-ray diffractometer (XRD) and Autosorb, respectively. Factors affecting the photocatalytic decomposition i.e. pH, TiO2 dosage, irradiation time, initial LAS concentration were investigated in a batch reactor. The kinetic of LAS degradation was studied at room temperature. After degradation, byproduct formation was analyzed using GC-MS. The experimental results showed that a dominating crystalline structure of TiO2 was the tetragonal anatase phase (82.58%). The TiO2 had a surface area of 77.79 m2/g, a pore size of 14.38 nm in diameter and a pore volume of 0.28 cc/g. It was found that the optimum conditions for photocatalytic degradation of LAS were at initial LAS concentration of 20 mg/L, non-adjust pH (pH 5.5), TiO2 dosage of 100 mg/L with irradiation time for 60 mins. Under these conditions, the removal efficiency of LAS in the synthetic solution reached 83.20%. The removal of LAS follows the second order kinetic with rate constant of 0.0031 L/mg/min and half-life of 16.13 min. Alkyl long chains, carboxylic acids and aromatic rings were detected as its degradation products. The removal efficiencies of LAS, orthophosphates and COD in industrial laundry wastewater were 51.99?7.36%, 45.98?4.85 % and 16.00?0.00%, respectively. |
