<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Nanayakkara, Charith E.</style></author><author><style face="normal" font="default" size="100%">Jayaweera, Pradeep M.</style></author><author><style face="normal" font="default" size="100%">Rubasinghege, Gayan</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Surface Photochemistry of Adsorbed Nitrate: The Role of Adsorbed Water in the Formation of Reduced Nitrogen Species on α-Fe2O3 Particle Surfaces.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry A</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">surface photochem nitrate nitric acid adsorbate iron oxide particle</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">118</style></volume><pages><style face="normal" font="default" size="100%">158 - 166</style></pages><isbn><style face="normal" font="default" size="100%">1089-5639</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The surface photochem. of nitrate, formed from nitric acid adsorption, on hematite (α-Fe2O3) particle surfaces under different environmental conditions is investigated using XPS.  Following exposure of α-Fe2O3 particle surfaces to gas-phase nitric acid, a peak in the N1s region is seen at 407.4 eV; this binding energy is indicative of adsorbed nitrate.  Upon broadband irradn. with light (λ &gt; 300 nm), the nitrate peak decreases in intensity as a result of a decrease in adsorbed nitrate on the surface.  Concomitant with this decrease in the nitrate coverage, there is the appearance of two lower binding energy peaks in the N1s region at 401.7 and 400.3 eV, due to reduced nitrogen species.  The formation as well as the stability of these reduced nitrogen species, identified as NO- and N-, are further investigated as a function of water vapor pressure.  Addnl., irradn. of adsorbed nitrate on α-Fe2O3 generates three nitrogen gas-phase products including NO2, NO, and N2O.  As shown here, different environmental conditions of water vapor pressure and the presence of mol. oxygen greatly influence the relative photoproduct distribution from nitrate surface photochem.  The atm. implications of these results are discussed. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2013:1898077(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Jayaweera, Pradeep M.</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Sulfur Dioxide Adsorption on TiO2 Nanoparticles: Influence of Particle Size, Coadsorbates, Sample Pretreatment, and Light on Surface Speciation and Surface Coverage.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry C</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">adsorption sulfur dioxide titania nanoparticle surface speciation irradn</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2011///</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">115</style></volume><pages><style face="normal" font="default" size="100%">492 - 500</style></pages><isbn><style face="normal" font="default" size="100%">1932-7447</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The adsorption of sulfur dioxide (SO2) on titanium dioxide (TiO2) nanoparticle surfaces at 296 K under a wide range of conditions has been investigated.  XPS is used to investigate the surface speciation and surface coverage of sulfur-contg. products on ca. 4 nm TiO2 anatase particles that remain on the surface following adsorption of SO2.  The effects of various environmental conditions of relative humidity, mol. oxygen, and broadband UV/vis irradn. as well as sample pretreatment were found to impact the speciation of adsorbed SO2 as well as the satn. coverage.  In particular, in the absence of light, the majority surface species upon SO2 adsorption is found to be adsorbed sulfite.  Broadband UV/vis irradn. during sulfur dioxide adsorption leads to an increase (nearly 2-fold) in the amt. of adsorbed sulfur species, as compared to expts. with no light, and results in the formation of adsorbed sulfate.  The formation of sulfate was quant. in the presence of mol. oxygen.  New surface species including chemisorbed mol. SO2 were obsd. on samples that have been reduced in vacuum through argon ion sputtering.  The total amt. of adsorbed sulfur was impacted by surface hydroxyl group coverage and molecularly adsorbed water layer.  Addnl., comparison of sulfur dioxide adsorption on 4 vs. 32 nm sized anatase nanoparticles showed that surface satn. coverages of adsorbed sulfite on the 4 nm particles was almost twice that of 32 nm particles as measured by the S2p:Ti2p peak area ratios, thus showing an increase in the inherent adsorption capacity of the smaller particles.  Proposed adsorption sites and mechanisms to account for the obsd. exptl. data are discussed. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2010:1546849(Journal; Online Computer File)</style></notes></record></records></xml>