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Ag-doped TiO2 immobilized on Al2O3 bead as oxidation catalyst
(2007-01-01)
Jaroenworaluck, Angkhana
;
Supothina, Sitthisuntorn
;
Chumnanklang, Rung Arun
;
Juengsuwattananon, Kannikar
;
Jinawath, Supatra
Ag-doped TiO<inf>2</inf> catalyst employed as the oxidation catalyst candidate was prepared by two methods, co-precipitation and dip coating method. Co-precipitation method was conducted by adding AgNO<inf>3</inf> into the titanium precursor before gelation and then the obtained solution was coated on the alumna beads. Dip coating method was conducted by coating the first layer on alumina beads with titanium precursor followed by coating the second layer with AgNO<inf>3</inf>. The fired Ag-doped TiO<inf>2</inf> coated on alumina beads was used as catalyst for catalytic oxidation of methanol and carbon monoxide by using oxygen as oxidizing agent in a gas-phase reactor. The methods of catalyst preparation were found to affect the catalytic efficiency. Dip coating method showed better oxidation reaction as Ag-doped TiO<inf>2</inf> catalysts were well dispersed on the alumina beads.
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A textile waste water treatment system using photocatalytic reactor and catalyst recycle unit
(2007-01-01)
Tawkaew, Sittinun
;
Sooknoi, Tawan
;
Jaroenworaluck, Angkhana
;
Panyatbanrnaporn, Thammarat
;
Supothina, Sitthisuntorn
A photocatalytic system for wastewater treatment from textile industries was constructed and tested for its efficiency. The system consisted of two units - a photoreactor for dye decomposition and a catalyst recovery unit. The photoreactor was an annular plug flow photoreactor under irradiation of 36 W Toshiba blacklight. The catalyst recovery unit was 42 L of sediment tank for TiO<inf>2</inf> catalyst recovery. In our study, a Cibra Cron red R-W 150% (an anionic azo dye) was used to prepare a synthetic textile wastewater. The experimental parameters such as flow rate, pH, dye initial concentration, catalyst loading and setteled time that affected the system performance were investigated. The photodegradation kinetics were found to follow the Langmuire - Hinshelwood model and also depended on the TiO<inf>2</inf> concentration and the pH. The optimum condition for photocatalytic decomposition was at pH 3 and at 1 g/L of TiO<inf>2</inf> catalyst loading. The reaction rate constant, k and the adsorption constant, K for the scale-up photoreactor were 3.345 mg/L-min and 0.0204 L/mg, respectively. For the catalyst recycle unit, the overflow and underflow concentration of the TiO<inf>2</inf> catalyst were 2.00 and 0.002 mg/L, respectively, at 100 ml/min of inlet flow rate, 50 ml/min of overflow and 50 ml/min of underflow.
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Ag-doped TiO2 immobilized on Al2O3 bead as oxidation catalyst
(2007-01-01)
Panyathanmaporn, Thammarat
;
Jaroenworaluck, Angkhana
;
Supothina, Sitthisuntorn
;
Chumnanklang, Rung Arun
;
Juengsuwattananon, Kannikar
Ag-doped TiO<inf>2</inf> catalyst employed as the oxidation catalyst candidate was prepared by two methods, co-precipitation and dip coating method. Co-precipitation method was conducted by adding AgNO<inf>3</inf> into the titanium precursor before gelation and then the obtained solution was coated on the alumna beads. Dip coating method was conducted by coating the first layer on alumina beads with titanium precursor followed by coating the second layer with AgNO<inf>3</inf>. The fired Ag-doped TiO<inf>2</inf> coated on alumina beads was used as catalyst for catalytic oxidation of methanol and carbon monoxide by using oxygen as oxidizing agent in a gas-phase reactor. The methods of catalyst preparation were found to affect the catalytic efficiency. Dip coating method showed better oxidation reaction as Ag-doped TiO<inf>2</inf> catalysts were well dispersed on the alumina beads.

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