Aminomodified spherical mesoporous silica (SiO2NH2) was prepared by changing the amount of APTES (3Aminopropyltriethoxysilane),and the optimum preparation conditions were explored.The results of XRD and TEM showed that the spherical mesoporous silica in an average diameter of 5.0 nm is of wormlike mesoporous structure with good monodispersion. Elemental analysis showed that the aminomodified effect is the best when the amount of APTES is 1 mL(SiO2NH2(1.0)).The prepared SiO2NH2 as an adsorbent for the adsorption of Pd2+ and the regeneration of the adsorbent were investigated. The experiment results showed the adsorption efficiency reaches 71% with the mass loss of only 7.3% after five cyclic adsorptions. The modified spherical mesoporous silica with good absorbability, reproducibility, eroding resistion and easyhandle of operation may have significant applicability as a reusable adsorbent.

modified; spherical; mesoporous silica; palladium ions; cyclic adsorption