Adsorption of methyl-orange from aqueous solution onto nanoporous silica materials

The batch-adsorption experiments are carried out for anionic dye(methyl orange) using uncalcined mesoporous materials, calcined mesoporous materials and modied mesoporous materials by impregnation method using polyelectrolyte (PDDA, poly (diallydimethylammonium chloride) as a modication agent. The resulting samples were characterized by XRD, FT-IR and nitrogen adsorption-desorption analysis. The results indicate that uncalcined MCM-48 silica mesoporous molecular sieves (noted as MCM-48) can be used as the eective adsorbent for the removal of Methyl Orange (MO) from aqueous system. The eect of various factors such as chemical modication, contact time, initial concentration, adsorbent dose, agitation speed, and solution pH and reaction temperature has been studied. The experimental data obtained with MCM-48 t best to the Langmuir isotherm model and exhibit a maximum adsorption capacity (qmax) of 769.23 mg g??1, and follows the second-order equation.