Recently, Chen et al., (2009)reported that 3-(2-aminoethylamino) propyltrimethoxysilane (AAPTS) has been modified As (V).
The study shows that As (V) can be adsorbed by the modified mesoporous silica sorbet modified AAPTS by electrostatic effect because the compounds of As(III) are neutral in As the compounds of As(V) are negatively charged in the pH range 3-9 [240] whereas previous investigations show that AAPTS can be complexed with other heavy metal ions (such as Cd(II), Cu(II), Ni(II), Pb(II) and Zn(II)) by coordination bond.