Synthesis of new type of dendritic mesoprocesses silica and its applications towards elimination of some metal ions

L-Cysteine-modified dendritic fibrous nanosilica grafted by amine groups (Cys-DFNS-NH2) have been synthesized by a novel hydrothermal method.1 The N2 adsorption-desorption isotherms analysis on the Cys-DFNS-NH2 show that the average pore volume and surface area of the prepared fibrous Cys-DFNS-NH2 were 2.2 cm3 g-1 and 205 m2/g, respectively. Also, average pore size is 6.06 nm.2 Adsorption behavior of the Cys-DFNS-NH2 for Cd2+, Cu2+, Ag+, and Pb2+ was investigated by electrochemical methods. The results show that Cys-DFNS-NH2 can selectively adsorb Cd2+, Ag+, and Pb2+ in different potentials. Finally, application of engineered adsorbent for the removal of Cd2+, Ag+, and Pb2+ from contaminated water samples was examined. This work provides a new platform to synthesis of Cys-DFNS-NH2 with high specific surface area for efficient adsorbent of specific metal ions.

Keywords:

Super-adsorbent , Removal of metal ions , Cysteine , Dendritic fibrous nanosilica.