01911nas a2200241 4500008004100000022001400041245010200055210006900157260009200226300001200318490000600330520101100336653001301347653002301360653001801383653001501401653001201416100002901428700002101457700003101478700003001509856013001539 2009 eng d a1533-488000aTemplate free synthesis of mesoporous TiO2 with high wall thickness and nanocrystalline framework0 aTemplate free synthesis of mesoporous TiO2 with high wall thickn a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScJAN a371-3770 v93 a

A simple procedure to prepare nanocrystalline mesoporous titania (meso-TiO2) is reported without any templating agent and it possesses a high BET surface area and a large pore wall thickness (11.3 nm) than that of meso-TiO2 prepared by other methods. Nanocrystalline meso-TiO2 also has been synthesized with hexadecylamine template for comparison through known procedure. The meso-TiO2 materials were characterized by X-ray diffraction, FT-IR, UV-Vis absorbance spectra, thermal analysis, SEM, HRTEM and textural properties through N-2 adsorption-desorption isotherms. Spherical shape particles in a range of few hundred nanometers are obtained in the template free method. Above systematic characterization provides direct indications toward the mechanism of formation of meso-TiO2 in the template free method. A comparison of the physical and textural properties indicates a possibility of coarse-tuning of the textural characteristics of mesoporous TiO2 by adopting different preparation methods.

10aMesopore10aMesopore Formation10aTemplate-Free10aThick Wall10atitania1 aKulkarni, Dhanashree, G.1 aMurugan, Vadivel1 aViswanath, Annamraju, Kasi1 aGopinath, Chinnakonda, S. uhttp://library.ncl.res.in/content/template-free-synthesis-mesoporous-tio2-high-wall-thickness-and-nanocrystalline-framework-002152nas a2200241 4500008004100000022001400041245009600055210006900151260007100220300001400291490000600305520132100311653001401632653001101646653001901657653002201676653001201698653001301710100002201723700002201745700003001767856011301797 2014 eng d a2155-543500aAmbient oxidation of benzene to phenol by photocatalysis on Au/Ti0.98V0.02O2: role of holes0 aAmbient oxidation of benzene to phenol by photocatalysis on AuTi a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP a2844-28530 v43 a

A potential photocatalyst with 2 atom % vanadium incorporated into the 1 lattice of disordered mesoporous titania, Ti0.98V0.02O2, (TV2) was synthesized. Au was deposited on TV2 (Au/TV2) through a photodeposition method. Structural, microscopy, and spectroscopy techniques support the incorporation of vanadium into the TiO2 lattice, and Au was deposited on the surfaces of TV2. Photocatalytic oxidation of benzene was conducted at ambient temperature under UV and/or visible light to demonstrate the catalytic activity of the Au/TV2 catalyst. The TV2 lattice exhibits a quantum jump in benzene to phenol oxidation compared to that of TiO2, highlighting the importance of V for oxidation. Introduction of Au onto TV2 further increases the benzene to phenol oxidation and phenol yield by a factor of 2 under UV light compared to those of bare TV2. No significant phenol production was observed in visible light with or without gold, indicating the role of gold is indirect toward charge separation and electron storage. Nano gold clusters on TV2 selectively store photoexcited electrons and in turn maximize holes utilization on TiO2. The high photocatalytic activity of Au/TV2 is mainly attributed to the presence of Schottky junctions, disordered mesoporosity, and short diffusion lengths for charge carriers.

10anano gold10aphenol10aPhotocatalysis10aSchottky junction10atitania10aVanadium1 aDevaraji, Perumal1 aSathu, Naveen, K.1 aGopinath, Chinnakonda, S. uhttp://library.ncl.res.in/content/ambient-oxidation-benzene-phenol-photocatalysis-auti098v002o2-role-holes-002084nas a2200241 4500008004100000022001400041245011900055210006900174260000800243300001200251490000600263520126900269653002001538653001201558653001801570653001201588653002001600100002601620700001701646700002001663700003001683856012901713 2018 eng d a2194-428800aMarginally hydrogenated triphasic titania nanotubes for effective visible-light photocatalytic hydrogen generation0 aMarginally hydrogenated triphasic titania nanotubes for effectiv cFEB a280-2880 v63 a

We report the first demonstration of hydrogen-annealed triphase TiO nanotubes (anatase-rutile-brookite) (T-ARB) as a visible-light-active photocatalyst for water splitting with high quantum efficiency. As-synthesized T-ARB was annealed under hydrogen atmosphere at 250 and 4508 degrees C for 2 h. We found that the tubular structures were retained in the hydrogenated TiO2 samples. It was observed that the concentrations of Ti3+ and the oxygen vacancies and their distribution significantly increased with respect to the hydrogen annealing temperature. Such changes in defects were found to be critical in enhancing the photocatalytic activity of the hydrogen-annealed triphase TiO2 nanotubes. The triphase TiO2 nanotubes hydrogen annealed at 450 degrees C were 16 times more efficient than pristine TiO2. Such an increase in the photocatalytic activity was explained by a triphase band diagram with defect states below the conduction band of each phase, which facilitated visible-light activity and easy transfer of charge carriers from one phase to another. Our study showed that the well-designed multiphase construction with oxygen vacancies enhanced the photocatalytic activity tremendously owing to the presence of a higher number of phase junctions.

10acharge transfer10aDefects10aHydrogenation10atitania10awater splitting1 aPreethi, Laguduva, K.1 aMathews, Tom1 aWalczak, Lukasz1 aGopinath, Chinnakonda, S. uhttp://library.ncl.res.in/content/marginally-hydrogenated-triphasic-titania-nanotubes-effective-visible-light-photocatalytic03097nas a2200277 4500008004100000022001400041245012600055210006900181260000900250300001200259490000600271520215500277653001902432653001902451653001902470653001402489653001202503100002302515700002102538700002902559700002902588700002402617700001902641700003002660856012902690 2023 eng d a2574-096200aFacile one-pot synthesis of Cu x O/TiO2 photocatalysts by regulating Cu oxidation state for efficient solar H2 production0 aFacile onepot synthesis of Cu x OTiO2 photocatalysts by regulati cDEC  a104-1160 v73 a

Development of highly efficient CuxO/TiO2 photocatalysts by regulating the oxidation state of Cu exclusively in either single or mixed oxidation state(s) is desirable but difficult to achieve without employing any external reagents. The present work describes a one-pot synthesis strategy to obtain CuxO/TiO2 photocatalysts with Cu in +1 and/or +2 by using a suitable combination of ethylene diamine tetra acetic acid (EDTA) and ethylene diamine, carefully varying the Cu content, and heat treatment process. CuxO/TiO2 nanocomposite catalysts were characterized thoroughly by physicochemical methods. Textural analysis indicates a high dispersion of CuxO on porous TiO2 with p-n heterojunctions between them in CuxO/TiO2 catalysts. UV-visible spectral analysis suggests the presence of CuxO on TiO2 with significantly extended absorption from the UV to the visible region. X-ray photoelectron spectroscopy (XPS) analysis indicates a strong synergetic interaction between TiO2 and CuxO due to the comparable CB potential and p-n heterojunction at the interface among them. Photoelectrochemical studies demonstrate excellent charge-carrier separation efficiency, low charge-transfer resistance, and high double-layer capacitance with Cu2O/TiO2 photocatalysts. Photocatalytic efficacy of a CuxO/TiO2 nanocomposite in thin-film form has been demonstrated for solar hydrogen generation in sunlight. The incorporation of Cu+ in TiO2 largely improves the H-2 production, and all of the CuxO/TiO2 nanocomposites in thin-film form exhibited higher efficiency compared to their particulate/suspension counterpart. Among the composite catalysts, TiCu-1 in thin-film form, with Cu exclusively in +1 oxidation state, exhibited a high hydrogen production rate of 7.06 mmol/hg, which is 6 times higher than its suspension counterpart; also catalysts containing mixed Cu-oxidation states exhibited about 60-70% activity as that of TiCu-1. The superior performance of Cu2O/TiO2 nanocomposites in thin-film form was due to their enhanced light harvesting ability, high mass transfer rate, and easy accessibility of the reactant species to the active sites.

10aheterojunction10aPhotocatalysis10aSolar hydrogen10athin film10atitania1 aRajendran, Sivaraj1 aMani, Sunesh, S.1 aNivedhitha, Thazhath, R.1 aAsoka, Anantha, Krishnan1 aArun, Pushkaran, S.1 aMathew, Thomas1 aGopinath, Chinnakonda, S. uhttp://library.ncl.res.in/content/facile-one-pot-synthesis-cu-x-otio2-photocatalysts-regulating-cu-oxidation-state-efficient