ADSORPTION BEHAVIORS OF COPPER( II) FROM AQUEOUS SOLUTION ONTO FUNCTIONALIZED SBA-15

SBA-15 was functionalized with a post-synthesis method，using 3-aminopropyltrimethoxy-silane as the modifier agent． The functionalized SBA-15 was denoted as N-SBA-15． The samples were characterized by X-ray powder diffraction ( XＲD) ，fourier-transform infrared spectroscopy ( FT-IＲ) and N2 adsorption-desorption isotherms． The adsorption behavior of the adsorbents on Cu2 + ions was investigated using batch experiments． The kinetic data were analyzed using various kinetic models，such as pseudo-first-order，pseudo-second-order and intra-particle diffusion． The adsorption of Cu( II) onto N-SBA- 15 followed the film diffusion kinetics and intra-particle diffusion mechanism． The maximum adsorption capacity of Cu2 + was 0. 812 mmol /g at 45 ℃． The pseudo-second-order kinetic model was found to be well suited for the entire adsorption process． Adsorption equilibrium data could be also described well by Langmuir model． Thermodynamic calculations suggested that the adsorption of Cu2 + ions on functionalized-SBA-15 was spontaneous and endothermic and the adsorption was favorable at higher temperatures．