<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Chen, M.-S.</style></author><author><style face="normal" font="default" size="100%">Fan, H.-F.</style></author><author><style face="normal" font="default" size="100%">Lin, K.-C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Kinetic and thermodynamic investigation of rhodamine B adsorption at solid/solvent interfaces by use of evanescent-wave cavity ring-down spectroscopy</style></title><secondary-title><style face="normal" font="default" size="100%">Analytical Chemistry</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">ADSORPTION</style></keyword><keyword><style  face="normal" font="default" size="100%">Adsorption behavior</style></keyword><keyword><style  face="normal" font="default" size="100%">Adsorption equilibrium constants</style></keyword><keyword><style  face="normal" font="default" size="100%">Adsorption free energy</style></keyword><keyword><style  face="normal" font="default" size="100%">Adsorption isotherms</style></keyword><keyword><style  face="normal" font="default" size="100%">Chemical forms</style></keyword><keyword><style  face="normal" font="default" size="100%">Chlorotrimethylsilanes</style></keyword><keyword><style  face="normal" font="default" size="100%">Competitive models</style></keyword><keyword><style  face="normal" font="default" size="100%">DESORPTION</style></keyword><keyword><style  face="normal" font="default" size="100%">Desorption rate constants</style></keyword><keyword><style  face="normal" font="default" size="100%">Double layers</style></keyword><keyword><style  face="normal" font="default" size="100%">Electrochemical electrodes</style></keyword><keyword><style  face="normal" font="default" size="100%">Electrostatic attractions</style></keyword><keyword><style  face="normal" font="default" size="100%">Equilibrium conditions</style></keyword><keyword><style  face="normal" font="default" size="100%">Equilibrium constants</style></keyword><keyword><style  face="normal" font="default" size="100%">Evanescent-wave cavity ring-down spectroscopy</style></keyword><keyword><style  face="normal" font="default" size="100%">Hydrophobic interactions</style></keyword><keyword><style  face="normal" font="default" size="100%">hydrophobicity</style></keyword><keyword><style  face="normal" font="default" size="100%">Kinetic models</style></keyword><keyword><style  face="normal" font="default" size="100%">Langmuir isotherm models</style></keyword><keyword><style  face="normal" font="default" size="100%">Langmuirs</style></keyword><keyword><style  face="normal" font="default" size="100%">Light measurement</style></keyword><keyword><style  face="normal" font="default" size="100%">Rate constants</style></keyword><keyword><style  face="normal" font="default" size="100%">Rhodamine B</style></keyword><keyword><style  face="normal" font="default" size="100%">Rhodamine B adsorption</style></keyword><keyword><style  face="normal" font="default" size="100%">Solution pH</style></keyword><keyword><style  face="normal" font="default" size="100%">Thermodynamic investigation</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.scopus.com/inward/record.uri?eid=2-s2.0-76149119433&amp;doi=10.1021%2fac9020209&amp;partnerID=40&amp;md5=0a693f7126106d98a882dd4f897f192c</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">3</style></number><volume><style face="normal" font="default" size="100%">82</style></volume><pages><style face="normal" font="default" size="100%">868-877</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Evanescent-wave cavity ring-down spectroscopy is applied to investigate the adsorption behavior of rhodamine B at three different interfaces. The adsorption equilibrium constant (Kads) and adsorption free energy of rhodamine B at the silica/methanol interface are determined to be (1.5 ± 0.2) × 104 M-1 and -23.8 ± 0.4 kJ/mol by use of a Langmuir isotherm model. A Langmuir-based kinetic model is also developed to determine the corresponding adsorption and desorption rate constants of (1.02 ± 0.03) × 102 M-1 s-1 and (7.1 ± 0.2) × 10-3 s-1, from which Kads is obtained to be (1.45 ± 0.09) × 104 M-1, in agreement with the value determined under equilibrium conditions. Similarly, when rhodamine B is at the chlorotrimethylsilane-immobilized silica/methanol interface, the adsorption and desorption rate constants are determined to be (1.7 ± 0.2) × 102 M-1 s-1 and (5.0 ± 1.0) × 10-3 s-1· The subsequent Kads is (3.6 ± 0.4) × 104 M-1, which is larger than that at the silica/methanol interface. The former adsorption is dominated by hydrophobic interaction, while the latter is subject to electrostatic attraction. When rhodamine B is at the silica/water interface, there exist three chemical forms, including zwitterion (R+B -), cation (RBH+), and lactone (RBL). A combination of double-layer and Langmuir competitive models is used to fit the adsorption isotherm as a function of solution pH, yielding Kads of (2.5 ± 0.2) × 104 M-1 and (1.1 ± 0.2) × 105 M-1 for R+B- and RBH +, respectively. RBL is considered to have the same Kads value as R+B-. © 2010 American Chemical Society.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;cited By 24&lt;/p&gt;
</style></notes></record></records></xml>