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Photocatalytic Decomposition of Gaseous Acetaldehyde by Metal Loaded $TiO_2$ with Ozonation
Cho, Ki-Chul,Yeo, Hyun-Gu Korean Society for Atmospheric Environment 2006 한국대기환경학회지 Vol.22 No.E1
The decomposition of gaseous $CH_3CHO$ was investigated by metal loaded $TiO_2$ (pure $TiO_2,\;Pt/TiO_2,\;Pd/TiO_2,\;Mn/TiO_2\;and\;Ag/TiO_2$) with $UV/TiO_2$ process and $UV/TiO_2/O_3$ process at room temperature and atmospheric pressure. Metal loaded $TiO_2$ was prepared by photodeposition. Decomposition of $CH_3CHO$ was carried out in a flow-type photochemical reaction system using three 10W black light lamps ($300{\sim}400nm$) as a light source. The experimental results showed that the degradation rate of $CH_3CHO$ was increased with Pt and Ag on $TiO_2$ compared to pure $TiO_2$, but decreased with depositing Pd and Mn on pure $TiO_2$. The considerable increase in the degradation efficiency of the $CH_3CHO$ was found by a combination of photocatalysis and ozonation as compared to only by ozonation or photocatalysis. Loading of Pt on $TiO_2$ promoted conversion of gaseous ozone. The degradation rate of gaseous $CH_3CHO$ decreased with an increase of water vapor in the feed stream for the both $UV/TiO_2\;and\;UV/TiO_2/O_3$ processes. The pure $TiO_2$ was more affected by the water vapor than Pt loaded $TiO_2$.
졸-겔공정/광증착법을 이용한 Ag-Doped TiO<sub>2</sub> 합성 및 광촉매 특성
김병민,김정식,Kim, Byeong-Min,Kim, Jung-Sik 한국재료학회 2016 한국재료학회지 Vol.26 No.2
$TiO_2$ nanoparticles were synthesized by a sol-gel process using titanium tetra isopropoxide as a precursor at room temperature. Ag-doped $TiO_2$ nanoparticles were prepared by photoreduction of $AgNO_3$ on $TiO_2$ under UV light irradiation and calcinated at $400^{\circ}C$. Ag-doped $TiO_2$ nanoparticles were characterized for their structural and morphological properties by X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The photocatalytic properties of the $TiO_2$ and Ag-doped $TiO_2$ nanoparticles were evaluated according to the degree of photocatalytic degradation of gaseous benzene under UV and visible light irradiation. To estimate the rate of photolysis under UV (${\lambda}=365nm$) and visible (${\lambda}{\geq}410nm$) light, the residual concentration of benzene was monitored by gas chromatography (GC). Both undoped/doped nanoparticles showed about 80 % of photolysis of benzene under UV light. However, under visible light irradiation Ag-doped $TiO_2$ nanoparticles exhibited a photocatalytic reaction toward the photodegradation of benzene more efficient than that of bare $TiO_2$. The enhanced photocatalytic reaction of Ag-doped $TiO_2$ nanoparticles is attributed to the decrease in the activation energy and to the existence of Ag in the $TiO_2$ host lattice, which increases the absorption capacity in the visible region by acting as an electron trapper and promotes charge separation of the photoinduced electrons ($e^-$) and holes ($h^+$). The use of Ag-doped $TiO_2$ nanoparticles preserved the option of an environmentally benign photocatalytic reaction using visible light; These particles can be applicable to environmental cleaning applications.
Halil I. Akyildiz,Busra Aydemir Yilmaz,Sumeyye Diler 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
Atomic layer deposition is a low-temperature conformal thin film formation technique that can modify materials tocreate functional surfaces. In this study, ALD coatings onto fibrous structures were used to synthesize the Ag nanoparticleson the fibers, which can be used for a wide variety of applications. During the treatment, cotton fibers were coated with20 nm thick ZnO films via ALD, and Ag nanoparticles were deposited on top using a photochemical approach. As thesamples were analyzed with FESEM images, the ZnO film coatings were found conformal and crystalline with evident grainson the fiber surfaces. After the photodeposition process, the Ag particles were also grown conformal on ALD films withflake-like morphology. XRD analysis showed ZnO and Ag crystalline peaks were visible for the corresponding samples. XPSanalysis showed Ag deposition onto untreated cotton is due to ionic interactions whereas the presence of ZnO enablesmetallic nanoparticles formation. Antibacterial activity of the coating materials was tested using ISO 20645 and AATCC 100standards, indicating that a high amount of silver present on the surface of the fibers created an uninhabitable environment forthe S. aureus and E. coli bacteria.
나노 은을 광증착시킨 폴리(에틸렌 테레프탈레이트)/나노-TiO<sub>2</sub> 복합체의 항균특성 연구
조성민,지광환,김정현,권오경,임상규,민병길,Jo, Seong-Min,Jhee, Kwang Hwan,Kim, Jung Hyun,Kwon, Oh Kyung,Lim, Sang Kyoo,Min, Byung Gil 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.6
Nanocomposite films of poly(ethylene terephthalate)(PET) and nano titania($TiO_2$) were prepared by melt compounding with a twin-screw extruder followed by hot pressing for the purpose of investigating antibacterial activity. FE-SEM, EDS and XRD measurements confirmed that nano $TiO_2$ was successfully dispersed at the level of individual particles in the PET matrix. Silver was introduced through photocatalytic reduction by nano $TiO_2$ under UV (254 nm) irradiation to the nanocomposite films after being immersed in aqueous solution $AgNO_3$ (100 ppm Ag ion). Even at 1 wt% of $TiO_2$ content, the nanocomposite with silver photodeposition exhibited strong antimicrobial activity against Klebsiella pneumoniae and Staphylococcus aureus in measurement by shaking flask method.
Pt immobilization on TiO<sub>2</sub>-embedded carbon nanofibers using photodeposition
Kim, S.,Choi, S. K.,Lim, S. K.,Chang, D.,Park, H. WILEY-VCH Verlag 2010 Crystal research and technology Vol.45 No.10
<P>Currently, the use of fuel cell electrodes containing Pt catalysts has been limited due to technological problems in this system, primarily the system's high cost. The improvement of Pt catalyst use has been achieved by changes in the Pt immobilization method. In this study, we have studied Pt immobilization on carbon nanofiber composites using the photodeposition method. First, we prepared the carbon nanofibers, which were homogeneously embedded TiO<SUB>2</SUB> using the electrospinning technology. These TiO<SUB>2</SUB>-embedded carbon nanofiber composites (TiO<SUB>2</SUB>/CNFs) were then immersed in a Pt precursor solution and irradiated with UV light. The obtained Pt-deposited TiO<SUB>2</SUB>/CNFs contained Pt that was immobilized on the carbon nanofibers, and the Pt particle size was 2-5 nm. The XPS spectra showed that the amount of Pt increased with an increasing UV irradiation time. The current densities and total charge also increased with an increase in the UV irradiation time, possibly due to an increase of active specific area by finely dispersed Pt nanoparticles. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Photocatalytic Degradation of Gaseous Benzene on Photodeposited Ag-TiO<sub>2</sub> Nanoparticles
Kim, Byeong-Min,Yadav, Hemraj M,Kim, Jung-Sik American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>TiO2 nanoparticles were synthesized by a simple sol-gel method using titanium isopropoxide as the precursor. Ag-TiO2 nanoparticles were prepared by the photoreduction of AgNO3 on TiO2 under UV light irradiation. The structural and morphological properties of the Ag-TiO2 nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and transmission electron microscopy. The optical properties of TiO2 and photodeposited Ag-TiO2 were analyzed by UV-Vis spectrophotometry. The photocatalytic properties of the TiO2 and photodeposited Ag-TiO2 nanoparticles were evaluated by the photocatalytic degradation of gaseous benzene under UV and visible light irradiation. The residual concentration of benzene was monitored by gas chromatography to estimate the rate of photolysis under UV (lambda = 365 nm) and visible (lambda >= 410 nm) light. The photodeposited Ag-TiO2 nanoparticles exhibited more efficient photocatalytic activity towards the photodegradation of benzene than bare TiO2 under visible light irradiation. The enhanced photocatalytic activity of Ag-TiO2 nanoparticles was attributed to the decrease in the activation energy and the existence of Ag in the TiO2 host lattice, which increases the absorption capacity in the visible region by acting as electron trappers to promote the charge separation of photoinduced electrons (e(-)) and holes (h(+)). The Ag-TiO2 nanoparticles have environmentally benign photocatalytic activity using visible light and can have environmental cleaning applications.</P>
나노 TiO<sub>2</sub>와 나노 은의 광증착을 이용한 폴리우레탄 멤브레인의 항균성 부여 연구
설인환,김영아,이현정,채석,민병길,Sul, In Hwan,Kim, Young-A,Lee, Hyun Jeong,Chae, Seog,Min, Byung Gil 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.5
Polyurethane membrane was chosen as an alternate for Gore-Tex$^{(R)}$ used in outdoor sportswear. Antimicrobial property was induced by dispersing titanium dioxide ($TiO_2$) particles on the surface of the membrane via sonication. Furthermore, Ag particle was photodeposited on the $TiO_2$ particles via UV irradiation to enhance the photocatalytic activity. Measurements using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy showed that $TiO_2$ and Ag particles were evenly deposited on the membrane. In addition, the antimicrobial property against Klebsiella pneumoniae and Staphylococcus aureus was validated using the shake flask method and clear zone method.
Photocatalytic Deposition of Silver Nanoparticles onto Organic/Inorganic Composite Nanofibers
Lim, Sang Kyoo,Lee, Soo-Keun,Hwang, Sung-Ho,Kim, Hoyoung WILEY-VCH Verlag 2006 Macromolecular materials and engineering Vol.291 No.10
<P>Summary: In this work, silver nanoparticles were embedded in electrospun organic/inorganic composite nanofibers consisting of PAN and TiO<SUB>2</SUB> through photocatalytic reduction of the silver ions in silver nitrate solutions under UV irradiation. The morphology and diameter of PAN/TiO<SUB>2</SUB> composite nanofibers could be controlled by varying the initial contents of TiO<SUB>2</SUB> in the spinning solution. From TEM images and UV-Vis spectra, it has been confirmed that monodisperse silver nanoparticles with a diameter of ≈2 nm were deposited selectively upon the titania of the as prepared composite nanofibers. The amount of Ag nanoparticles embedded on composite nanofibers was greatly influenced by the amount of TiO<SUB>2</SUB> in composite nanofibers, reflecting the role of titania as the inorganic stabilizer and photocatalyst.</P><P> <img src='wiley_img/14387492-2006-291-10-MAME200600264-gra001.gif' alt='wiley_img/14387492-2006-291-10-MAME200600264-gra001'> Graphic Morphology of silver nanoparticles embedded on PAN/TiO<SUB>2</SUB> composite nanofibers. </P>