Kinetics of adsorption of oxalic acid on different titanium dioxide samples
FTIR-ATR kinetic studies on the adsorption of oxalic acid on different TiO2 films were performed. The particulate films were obtained through the evaporation of TiO2 suspensions. The evolution of the IR bands followed a pseudo-first-order behavior, as previously observed. Systematic studies as a fun...
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todo:paper_00219797_v356_n1_p227_Roncaroli2023-10-03T14:25:13Z Kinetics of adsorption of oxalic acid on different titanium dioxide samples Roncaroli, F. Blesa, M.A. Adsorption ATR FTIR Kinetics Oxalic acid Surface complexation TiO2 Titanium dioxide ATR FTIR Oxalic Acid Surface complexation TiO Desorption Organic acids Oxides Rate constants Titanium Titanium dioxide Adsorption oxalic acid titanium dioxide adsorption kinetics article catalyst concentration (parameters) desorption diffusion evaporation evolution film infrared spectroscopy particle size particulate matter pollutant priority journal sensor suspension FTIR-ATR kinetic studies on the adsorption of oxalic acid on different TiO2 films were performed. The particulate films were obtained through the evaporation of TiO2 suspensions. The evolution of the IR bands followed a pseudo-first-order behavior, as previously observed. Systematic studies as a function of the oxalic acid concentration afforded the specific rate constant for adsorption (ka) and desorption (kd). The influence of physical parameters of the samples, i.e., specific BET area, crystalline domain size, TiO2 load, film area, and pore size, on the kinetic parameters ka and kd was analyzed. A mechanism in which the adsorption and desorption processes are controlled by the diffusion through the pores of the films is proposed (intraparticle diffusion). It is concluded that all the samples behave in the same way. Thicker films or those with smaller particle size (higher specific surface area, smaller pores) show the slowest rates of adsorption and desorption. These results are relevant for the design of efficient heterogeneous catalysts and sensors, and for the interpretation of pollutant adsorption. © 2010 Elsevier Inc. Fil:Roncaroli, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00219797_v356_n1_p227_Roncaroli |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Adsorption ATR FTIR Kinetics Oxalic acid Surface complexation TiO2 Titanium dioxide ATR FTIR Oxalic Acid Surface complexation TiO Desorption Organic acids Oxides Rate constants Titanium Titanium dioxide Adsorption oxalic acid titanium dioxide adsorption kinetics article catalyst concentration (parameters) desorption diffusion evaporation evolution film infrared spectroscopy particle size particulate matter pollutant priority journal sensor suspension |
| spellingShingle |
Adsorption ATR FTIR Kinetics Oxalic acid Surface complexation TiO2 Titanium dioxide ATR FTIR Oxalic Acid Surface complexation TiO Desorption Organic acids Oxides Rate constants Titanium Titanium dioxide Adsorption oxalic acid titanium dioxide adsorption kinetics article catalyst concentration (parameters) desorption diffusion evaporation evolution film infrared spectroscopy particle size particulate matter pollutant priority journal sensor suspension Roncaroli, F. Blesa, M.A. Kinetics of adsorption of oxalic acid on different titanium dioxide samples |
| topic_facet |
Adsorption ATR FTIR Kinetics Oxalic acid Surface complexation TiO2 Titanium dioxide ATR FTIR Oxalic Acid Surface complexation TiO Desorption Organic acids Oxides Rate constants Titanium Titanium dioxide Adsorption oxalic acid titanium dioxide adsorption kinetics article catalyst concentration (parameters) desorption diffusion evaporation evolution film infrared spectroscopy particle size particulate matter pollutant priority journal sensor suspension |
| description |
FTIR-ATR kinetic studies on the adsorption of oxalic acid on different TiO2 films were performed. The particulate films were obtained through the evaporation of TiO2 suspensions. The evolution of the IR bands followed a pseudo-first-order behavior, as previously observed. Systematic studies as a function of the oxalic acid concentration afforded the specific rate constant for adsorption (ka) and desorption (kd). The influence of physical parameters of the samples, i.e., specific BET area, crystalline domain size, TiO2 load, film area, and pore size, on the kinetic parameters ka and kd was analyzed. A mechanism in which the adsorption and desorption processes are controlled by the diffusion through the pores of the films is proposed (intraparticle diffusion). It is concluded that all the samples behave in the same way. Thicker films or those with smaller particle size (higher specific surface area, smaller pores) show the slowest rates of adsorption and desorption. These results are relevant for the design of efficient heterogeneous catalysts and sensors, and for the interpretation of pollutant adsorption. © 2010 Elsevier Inc. |
| format |
JOUR |
| author |
Roncaroli, F. Blesa, M.A. |
| author_facet |
Roncaroli, F. Blesa, M.A. |
| author_sort |
Roncaroli, F. |
| title |
Kinetics of adsorption of oxalic acid on different titanium dioxide samples |
| title_short |
Kinetics of adsorption of oxalic acid on different titanium dioxide samples |
| title_full |
Kinetics of adsorption of oxalic acid on different titanium dioxide samples |
| title_fullStr |
Kinetics of adsorption of oxalic acid on different titanium dioxide samples |
| title_full_unstemmed |
Kinetics of adsorption of oxalic acid on different titanium dioxide samples |
| title_sort |
kinetics of adsorption of oxalic acid on different titanium dioxide samples |
| url |
http://hdl.handle.net/20.500.12110/paper_00219797_v356_n1_p227_Roncaroli |
| work_keys_str_mv |
AT roncarolif kineticsofadsorptionofoxalicacidondifferenttitaniumdioxidesamples AT blesama kineticsofadsorptionofoxalicacidondifferenttitaniumdioxidesamples |
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1807315061001158656 |