@article {Chen2010868,
	title = {Kinetic and thermodynamic investigation of rhodamine B adsorption at solid/solvent interfaces by use of evanescent-wave cavity ring-down spectroscopy},
	journal = {Analytical Chemistry},
	volume = {82},
	number = {3},
	year = {2010},
	note = {<p>cited By 24</p>
},
	pages = {868-877},
	abstract = {<p>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 {\textpm} 0.2) {\texttimes} 104 M-1 and -23.8 {\textpm} 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 {\textpm} 0.03) {\texttimes} 102 M-1 s-1 and (7.1 {\textpm} 0.2) {\texttimes} 10-3 s-1, from which Kads is obtained to be (1.45 {\textpm} 0.09) {\texttimes} 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 {\textpm} 0.2) {\texttimes} 102 M-1 s-1 and (5.0 {\textpm} 1.0) {\texttimes} 10-3 s-1{\textperiodcentered} The subsequent Kads is (3.6 {\textpm} 0.4) {\texttimes} 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 {\textpm} 0.2) {\texttimes} 104 M-1 and (1.1 {\textpm} 0.2) {\texttimes} 105 M-1 for R+B- and RBH +, respectively. RBL is considered to have the same Kads value as R+B-. {\textcopyright} 2010 American Chemical Society.</p>
},
	keywords = {ADSORPTION, Adsorption behavior, Adsorption equilibrium constants, Adsorption free energy, Adsorption isotherms, Chemical forms, Chlorotrimethylsilanes, Competitive models, DESORPTION, Desorption rate constants, Double layers, Electrochemical electrodes, Electrostatic attractions, Equilibrium conditions, Equilibrium constants, Evanescent-wave cavity ring-down spectroscopy, Hydrophobic interactions, hydrophobicity, Kinetic models, Langmuir isotherm models, Langmuirs, Light measurement, Rate constants, Rhodamine B, Rhodamine B adsorption, Solution pH, Thermodynamic investigation},
	doi = {10.1021/ac9020209},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-76149119433\&doi=10.1021\%2fac9020209\&partnerID=40\&md5=0a693f7126106d98a882dd4f897f192c},
	author = {Chen, M.-S. and Fan, H.-F. and Lin, K.-C.}
}
