Adsorption of copper on amine-functionalized SBA-15 prepared by co-condensation: Equilibrium properties

Adsorption of Pb(II) and Cu(II) metal ions on functionalized large-pore mesoporous silica

“…are deprotonated with the increase in pH and more amino groups are available for coordination with Cu 2? ions (Lam et al 2006;Da'na and Sayari 2011;Shahbazi et al 2011). Also, at very low pH, the concentration of hydrogen ions is high, directly competing with Cu 2?…”

“…Several methods have been developed to remove heavy metal ions from aqueous solutions, and adsorption is one of the most frequently used techniques. The adsorbents adopted in the literature include waste dust (Wang and Lin 2008;Amarasinghe and Williams 2007;Sharaf and Hassan 2014;Singh et al 2014), clays (Ö zcan et al 2009), polymer fibers (Deng et al 2003), and porous silica (Feng et al 1997;Liu et al 2000;Lam et al 2006;Walcarius et al 2003;Vasudevan et al 2011;Blitz et al 2007;Aguado et al 2009Aguado et al , 2008Xia et al 2010;Da'na and Sayari 2011;Shahbazi et al 2011;Liang et al 2009;Kao et al 2008;Chandra et al 2010). Still, researches toward the development of efficient adsorbents for the removal of heavy metals from wastewater are of great concern.…”

“…The co-condensation method is often preferred to the post-grafting pathway because it minimizes processing steps and provides more uniform distribution of organic functionalities without blocking the entrance of the mesopores (Chen et al 2008;Sujandi and Park 2008;Wang et al 2005;Dufaud and Davis 2003;Melero et al 2006;Agnado et al 2008). Functional groups such as amino (Liu et al 2000;Walcarius et al 2003;Aguado et al 2009;Da'na and Sayari 2011;Shahbazi et al 2011) and thiol (Feng et al 1997;Walcarius et al 2003;Agnado et al 2008) have been incorporated onto the SBA-15 framework. Many works show that the adsorption capacity of mesoporous silica is related to the density of active sites and their textural properties (Lam et al 2006;Xia et al 2010;Agnado et al 2008).…”

Aminopropyl-grafted various silica mesostructures for adsorption of molybdenum ions from Re-containing effluent

“…Another advantage of using SBA-15 s as support material for metal ion adsorption is its much higher thermal and hydrothermal stabilities. Alternatively, the mesocellular foams (MCF) have also been the compelling representative mesoporous silica due to the handily achievable large spherical cell sizes (Schmidt-Winkel et al 1999;Dana and Sayari 2011). The addition of organic groups by grafting organosiloxane precursors onto the surface of the pores of mesoporous silicas results in functional mesoporous hybrid materials (Antoschuk and Jaroniec 2002;Bibby and Mercier 2002;Hossain and Mercier 2002;Walkarius et al 2002;Yoshitake et al 2002;Yee et al 2003;Messina et al 2006;Li et al 2008Li et al , 2013Li et al , 2015Idris 2015;Bordoni et al 2015;Yu et al 2015;Zhang et al 2007;Wu et al 2010;Maretto et al 2015;Coll et al 2009;Sun et al 2015;Kandula and Jeevanandam 2015).…”

Selective adsorption of CO2 on amino-functionalized silica spheres with centrosymmetric radial mesopores and high amino loading

“…Generally, two synthesis methods, i.e., post-grafting and co-condensation, have been applied to the preparation of AFMS (Da'na and Sayari 2011;Du and He 2012). The post-grafting method, however, often gives rise to an inhomogeneous surface coverage due to organic moieties congregating near the entries of the mesopores and the exterior surface of the resulting AFMS (Richer and Mercier 1998).…”