Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Comparing the removal of perchlorate when using single-walled carbon nanotubes (SWCNTs) or granular activated carbon: Adsorption kinetics and thermodynamics
This study aims to remove perchlorate using single-walled carbon nanotubes (SWCNTs) or granular activated carbon (GAC). Dynamic and equilibrium adsorption experiments were performed to evaluate the thermodynamic behavior of perchlorate on SWCNTs and GAC. Key parameters affecting the adsorption, such as pH, ionic strength, and temperature were studied. The experimental results showed that the dynamic adsorption experiment achieved equilibrium in approximately eight hours. The adsorption capacity increased as the concentration of perchlorate increased or as the ionic strength decreased. The selected adsorption models were the modified Freundlich, the pseudo–1st-order, and the pseudo–2nd-order equations. The results showed that the modified Freundlich equation best described the kinetic adsorption processes. The maximal adsorption capacities of GAC and SWCNTs were 33.87–28.21 mg/g and 13.64 − 10.03 mg/g, respectively, at a constant temperature between 5°C and 45°C. The thermodynamic parameters, such as the equilibrium constant (K0), the standard free energy changes (ΔG°), the standard enthalpy change (ΔH°) and the standard entropy change (ΔS°), were obtained. The results of the isothermal equilibrium adsorption experiment showed that low pH levels, low ionic strength, and low-temperature conditions facilitated the perchlorate adsorption, indicating that GAC and SWCNTs are potential absorbents for water treatment.
Comparing the removal of perchlorate when using single-walled carbon nanotubes (SWCNTs) or granular activated carbon: Adsorption kinetics and thermodynamics
This study aims to remove perchlorate using single-walled carbon nanotubes (SWCNTs) or granular activated carbon (GAC). Dynamic and equilibrium adsorption experiments were performed to evaluate the thermodynamic behavior of perchlorate on SWCNTs and GAC. Key parameters affecting the adsorption, such as pH, ionic strength, and temperature were studied. The experimental results showed that the dynamic adsorption experiment achieved equilibrium in approximately eight hours. The adsorption capacity increased as the concentration of perchlorate increased or as the ionic strength decreased. The selected adsorption models were the modified Freundlich, the pseudo–1st-order, and the pseudo–2nd-order equations. The results showed that the modified Freundlich equation best described the kinetic adsorption processes. The maximal adsorption capacities of GAC and SWCNTs were 33.87–28.21 mg/g and 13.64 − 10.03 mg/g, respectively, at a constant temperature between 5°C and 45°C. The thermodynamic parameters, such as the equilibrium constant (K0), the standard free energy changes (ΔG°), the standard enthalpy change (ΔH°) and the standard entropy change (ΔS°), were obtained. The results of the isothermal equilibrium adsorption experiment showed that low pH levels, low ionic strength, and low-temperature conditions facilitated the perchlorate adsorption, indicating that GAC and SWCNTs are potential absorbents for water treatment.
Comparing the removal of perchlorate when using single-walled carbon nanotubes (SWCNTs) or granular activated carbon: Adsorption kinetics and thermodynamics
Lou, Jie C. (Autor:in) / Hsu, Yung S. (Autor:in) / Hsu, Kai L. (Autor:in) / Chou, Ming S. (Autor:in) / Han, Jia Y. (Autor:in)
Journal of Environmental Science and Health, Part A ; 49 ; 503-513
16.04.2014
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Adsorption , SWCNTs , GAC , kinetics , perchlorate , thermodynamics
Single Walled Carbon Nanotubes (SWCNTs) Assembled Site-Selectively on Flexible Substrate
| British Library Online Contents | 2010
Removal of dissolved organic matter (DOM) from raw water by single-walled carbon nanotubes (SWCNTs)
| Taylor & Francis Verlag | 2011
Removal of dissolved organic matter (DOM) from raw water by single-walled carbon nanotubes (SWCNTs)
| Online Contents | 2011
| British Library Online Contents | 2016