Uptakeof Arsenic(V) Using Alumina FunctionalizedHighly Ordered MesoporousSBA-15 (Alx-SBA-15) as an EffectiveAdsorbent.

The SBA-15 (a mesoporous SiO2material) decorated with10% aluminum (Al10-SBA-15) was found to be an excellentadsorbent to remove As(V) from water. The highly dispersed aluminumspecies have been obtained over the well-ordered mesoporous Al10-SBA-15 adsorbent and act as the active adsorption sitesfor arsenic(V) removal instead of SiO2. The adsorptionbehavior of As(V) onto Al10-SBA-15 was investigated inaqueous solution using various experimental parameters. The adsorptiondata of As(V) could be fitted more successfully by the Langmuir isothermthan the Freundlich isotherm model, and the pseudo-second-order equationdescribed this entire adsorption process well. It is found from theanalysis of kinetic data with the intraparticle diffusion mode thatboth the boundary layer (film) diffusion and intraparticle diffusionmay contribute to the rate-limiting steps. Importantly, Al10-SBA-15 exhibits high arsenic(V) removal in the wide pH range of2.0–8.2 and can remove As(V) from water containing arsenateof ≤2.235 mg·L–1to reach levels inaccordance with the regulations for drinking water purposes (<10μg·L–1). Consequently, Al10-SBA-15 is believed to be an effective adsorbent for treating arsenatecontaminated wastewater. [ABSTRACT FROM AUTHOR]