介孔-枝状化合物复合体系对重金属离子吸附研究

在高含量硅羟基的SBA-15介孔孔道中用3-氨丙基三乙氧基硅烷(APTES)表面改性后, 在介孔孔道内合成了1代和2代的PAMAM (Poly(amide amine)) 枝状化合物. 利用该复合体系进行了重金属离子吸附实验, 并与只用APTES(3-氨丙基三乙氧基硅烷) 改性的SBA-15进行对比, 得到了各代样品对Pb²⁺和Cu²⁺的饱和吸附容量, 并且用TG-MS分析方法证实了PAMAM改性后的SBA-15对金属离子的络合强度要比仅用APTES改性的要强. 在模拟废水溶液吸附实验中, 该复合体系对Pb²⁺、Zn²⁺离子具有选择吸附, 处理后溶液中Pb²⁺、Zn²⁺离子浓度为0.003mg/L和0.037mg/L, 均低于国家饮用水标准.

PAMAM-SBA-15 Composite in Application of Heavy Metals Ions Adsorption

Using 3-aminopropyltriethoxysilan (APTES) to modify the interior surface of SBA-15 channels, PAMAM of generation 1 and generation 2 were successfully grafted in the meso-channels of SBA-15. The PAMAM-SBA-15 hybrids are employed in the adsorption of heavy metal ions to determine their adsorptive capacity, with the APTES modified SBA-15 as a reference sample. The bonding between PAMAM hybrids and metal ions are proved to be much stronger than that of APTES modified SBA-15 by TG-MS tests. Hybrids are used in deposition solution containing several kinds of heavy metal ions, and the selective adsorption of Pb²⁺ and Zn²⁺ is found. After deposition, the concentrations of Pb²⁺ and Zn²⁺ are reduced to 0.003mg/L and 0.037mg/L, respectively, which are lower than the national standard of drinking water.