Adsorption and desorption behaviors of Pd(II) on silica-gel functionalized with ester- and amino-terminated dendrimer-like polyamidoamine polymers

作者：Qu Rongjun^*; Ni Yuzhong; Liu Jianhui; Sun Changmei; Zhang Ying; Chen Hou; Ji Chunnuan

来源：Reactive and Functional Polymers, 2008, 68(8): 1272-1280.

DOI：10.1016/j.reactfunctpolym.2008.06.005

• silica-gel functionalized with polyamidoamine
• dynamics adsorption
• pd
• kinetics models
• desorption

The dynamic adsorption and desorption properties of ester- and amino-terminated dendrimer-like polyamidoamine (PAMAM) functionalized silica-gels (SiO(2)-G0 similar to SiO(2)-G4.0) for Pd(II) were investigated. The effect of solution acidity on adsorption was studied. The experimental result indicated that the optimum adsorption pH of above-mentioned functionalized silica-gels for Pd(II) was -0.30 when hydrochloric acid was used as medium. Adsorption kinetics suggested that the adsorption was controlled by film diffusion. The adsorption processes Of SiO(2)-GO and SiO(2)-G0.5 followed a pseudo-second-order model, and those of SiO(2)-G1.0 similar to SiO(2)-G4.0 could be described by pseudo-first-order model. The solution of 5% thiourea in 0.2 mol l(-1) HCl was employed as the eluent to assess the reusability of SiO(2)-GO similar to SiO(2)-G4.0. The results showed that ester-terminated products possessed higher desorption percentage than their corresponding amino-terminated ones. Due to the stronger encapsulation effects of interior cavities, the desorption percentages of higher generation products were lower than those of the low generation ones.

• 出版日期2008-8
• 单位鲁东大学; 山东大学