REMOVAL OF ARSENIC USING MESOPOROUS SILICATE MEDIA IMPREGNATED METAL OXIDES NANO-PARTICLES

摘要

The highly ordered mesoporous silica SBA-15 was successfully synthesized andrnincorporated with iron, aluminum, and zinc oxides by use of an incipient wetnessrnimpregnation technique. Aluminum 10% impregnation was safely incorporated by anrnincipient wetness impregnation technique for SBA-15, which had 638.75 m2/g of BETrnsurface area and 48 ? of pore diameter, without producing clogging of pore structures.rnThe adsorption capacities of these materials were evaluated with adsorption isotherm andrnkinetic studies under different batch conditions. Aluminum was the best incorporationrnmetal compound and impregnation of aluminum 10% for SBA-15 had greater than 2rntimes higher arsenate adsorption capacity and 15 times higher rate than activated aluminarnunder the condition of 0.133 mmol/L arsenate initial concentration and 0.333 g/L ofrnsolids concentration. Al10SBA-15 showed about 2.2 ~ 2.4 times higher arsenaternadsorption capacities than activated alumina in a broad range of arsenate initialrnconcentrations, in which the Freundlich isotherm model was fitted very well. The ratecontrollingrnstep of arsenate adsorption for all adsorbents appeared to be explained byrnboth the exchange reaction and diffusion reaction. These results showed greatrnadvantages of Al10SBA-15 for POE/POU application due to its rapid and high adsorptionrncapacity.