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Hashemizadeh, Iman,Golovko, Vladimir B.,Choi, Jungkyu,Tsang, Daniel C.W.,Yip, Alex C.K. Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.347 No.-
<P><B>Abstract</B></P> <P>Artificial TiO<SUB>2</SUB> leaves with the morphology replicating that of <I>Camellia</I> tree leaves were synthesized through a multi-step bio-templating approach. Scanning and transmission electron microscopy images of the final products indicated that proposed method successfully replicates the highly porous structure of the leaf photosystem, down to the thylakoids. The hierarchical pore network and morphology of the bio-templated TiO<SUB>2</SUB> catalyst were demonstrated to be critical factors in successful photocatalytic reduction of CO<SUB>2</SUB> under UV (370 nm) and visible (515 nm) light. The artificial TiO<SUB>2</SUB> leaves increased the selectivity towards methane in CO<SUB>2</SUB> photoreduction compared with benchmark commercial catalyst under UV light. The new TiO<SUB>2</SUB> structures also outperformed the P25 titania by more than 1.35 times in terms of total product yield (CO + CH<SUB>4</SUB>) of under visible light. We hypothesized that modifying the morphology of the catalyst can alter the pathway and efficiency of photocatalytic reactions. Deposition of ruthenium dioxide on the surface of the new TiO<SUB>2</SUB> architecture showed further improvement in photocatalytic activity under both UV and visible light. The photocatalytic reduction of CO<SUB>2</SUB> coupled with the oxidative water splitting was also validated by kinetic modelling. The experimental data exhibited a very good fit to the pseudo first order kinetics. The understanding of the morphological contribution of the photocatalyst revealed in this study can help to augment the efficiency and selectivity of CO<SUB>2</SUB> photoreduction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bio-templated TiO<SUB>2</SUB> has mesoporous structure replicating pores in green leaves. </LI> <LI> The porous TiO<SUB>2</SUB> showed higher visible light photocatalytic activity than P25 TiO<SUB>2</SUB>. </LI> <LI> Bio-templated TiO<SUB>2</SUB> outperformed P25 TiO<SUB>2</SUB> in CO<SUB>2</SUB> reduction and ethanol reforming. </LI> <LI> Significant effect of morphology on the photocatalytic activity was demonstrated. </LI> <LI> Deposition of RuO<SUB>2</SUB> improved photocatalytic activity under UV and visible light. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Transparent, photocatalytic, titania thin films formed at low temperature
Tim Kemmitt,Najeh. I. Al-Salim,Jiaxin Lian,Vladimir B. Golovko,Jan-Yves Ruzicka 한국물리학회 2013 Current Applied Physics Vol.13 No.1
A convenient method for the preparation of transparent, photocatalytic titania thin films is described. The films do not require annealing or thermal processing to develop photoactivity, thus can be applied to many thermally-sensitive substrates. Oxalic acid is used in place of the usual mineral acids to peptize the precipitated hydrous titania formed from the hydrolysis of titanium iso-propoxide. This leaves no inorganic residues in the film resulting in a higher quality film. The mineral phase and the photocatalytic activity produced are strongly influenced by the ratio of oxalic acid:titanium iso-propoxide employed. The peptization is carried out at 65 C with vigorous stirring for 1 h in water containing 15% v/v ethanol, followed by a hydrothermal step at 95 C. High oxalic acid:Ti molar ratios (0.5:1) result in rutile free sols, while lower ratios (0.25:1) result in anatase, rutile, brookite and TiO2(B) in varying proportions. The films were exposed to low level UV light to cure, and photodecompose the residual organic components in the film. The photodecomposition of residual oxalic acid in the cast films were monitored using infrared spectroscopy. Photo-activity of the UV-cured films was compared by monitoring the decoloration of methylene blue stains on the film, by UVeVis spectroscopy. Transmission was greater than 99% across the visible light region (400e800 nm).
A Study on Main Physical and Chemical Characteristics of East Mongolian Petroleum
( B. Shirchin ),( E. Nordov ),( D. Monkhoobor ),( M. Tuya ),( A. Sainbayar ),( B. Khulan ),( H. Tuya ),( D. Dorj ),( A. K. Golovko ) 한국공업화학회 2003 공업화학 Vol.14 No.4
N/A Since 1990, Tamsagbulag`s and Zuunbayan`s deposits of East Mongolia have been intensively explored. Our experts consider the deposits in Tamsagbulag as the most prospective areas. This study aims at determining physicai and chemical characteristics of petroleum, drilled in wells of Tamsagbulag and Zuunbayan areas. The study on chemical, physical characteristics, heteroatomic compounds, compositions of main oil fractions, group composition of hydrocarbons in gasoline fractions of East Mongolian petroleum was successfully carried out for the first time. The petroleum of Zuunbayan`s deposit rich in paraffins and heavy oil fractions is preferred for paraffin-bitumen orientation for the petroleum processing. On the contrary, petroleum of Tamsagbulag`s deposit rich in gasoline and kerosene fractions is preferred for gasoline-kerosene-diesel production orientation for petroleum processing. On the basis of these results a feasibility study for an oil processing plant in Mongolia is discussed.