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- 저자 : Murugesan Velayutham (검색결과 2 건)
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Kumaresan Loganathan,Palanisamy Bommusamy,Palanichamy Muthaiahpillai,Murugesan Velayutham 대한환경공학회 2011 Environmental Engineering Research Vol.16 No.2
Different weight percentages of Ag, Pt, and Au doped nano TiO₂ were synthesized using the acetic acid hydrolyzed sol-gel method. The crystallite phase, surface morphology combined with elemental composition and light absorption properties of the doped nano TiO₂ were comprehensively examined using X-ray diffraction (XRD), N2 sorption analysis, transmission electron microscopic (TEM), energy dispersive X-ray, and DRS UV-vis analysis. The doping of noble metals stabilized the anatase phase, without conversion to rutile phase. The formation of gold nano particles in Au doped nano TiO₂ was confirmed from the XRD patterns for gold. The specific surface area was found to be in the range 50 to 85 m2/g. TEM images confirmed the formation a hexagonal plate like morphology of nano TiO₂. The photocatalytic activity of doped nano TiO₂ was evaluated using 4-chlorophenol as the model pollutant. Au doped (0.5 wt %) nano TiO₂ was found to exhibit higher photocatalytic activity than the other noble metal doped nano TiO₂, pure nano TiO₂ and commercial TiO₂ (Degussa P-25). This enhanced photocatalytic activity was due to the cathodic influence of gold in suppressing the electron-hole recombination during the reaction.
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Role of ceria in CO2 adsorption on NaZSM-5 synthesized using rice husk ash
PUSHPARAJHEMALATHA,Margandan Bhagiyalakshmi,Mani Ganesh,Muthaihpillai Palanichamy,Velayutham Murugesan,장현태 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Ceria (3, 5, 7, 11, 19 wt%) impregnated NaZSM-5 was synthesized and studied for adsorption of CO2. They were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive Xray analysis (EDS), CO2-temperature programmed desorption (CO2-TPD) and Brunauer–Emmett–Teller (BET) techniques. The heat of the reaction (DHr) derived from differential scanning calorimetry (DSC)analysis was 490 Btu/lb. XRD analysis showed a decrease in the intensity of patterns with the increase in the ceria loading but crystallization of ceria to larger size was clearly evident for 11 and 19% loading. The surface area decreased for 3 and 5% loading, but increased for 7, 11 and 19% loading illustrating difference in dispersion. The maximum adsorption capacity of CeO2(5%)/NaZSM-5 was 130 mg/g of sorbent. Extraction of silica from the agricultural waste, rice husk, and its use in the zeolite synthesis was an advantage in this study. Hence, from the study it was concluded that ceria impregnated NaZSM-5 could be treated as a novel material for CO2 adsorption, as they were regenerable and recyclable. This study can also be applied to all other zeolites.
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