Abstract： Polyamine polyethyleneimine (PEI) was grafted onto micron-sized silica gel particles, obtaining the grafted particles PEI/SiO2. Subsequently, the nucleophilic substitution reaction between chloroactic acid and the first and secondary amino groups of PEI/SiO2 was performed, forming the imido-acetic acid (IAA)-type composite chelating adsorption material IAA-PEI/SiO2. The chelating adsorption characteristics of IAA-PEI/SiO2 to heavy metal ions, and the adsorption mechanism were investigated. The experimental results showed that IAA-PEI/SiO2 possesses strong adsorption ability for heavy metal ions by right of the synergism of electrostatic interaction and coordination chelating action between imido-acetic acid groups and heavy metal ions. The adsorption process of IAA-PEI/SiO2 towards heavy metal ions is exothermic. In the pH range, the hydrolysis of the heavy metal ions can be inhibited, the chelating adsorption ability of IAA-PEI/SiO2 to heavy metal ions increases with increasing pH value. The adsorption ability order of IAA-PEI/SiO2 to heavy metal ions is Ni2+>Pb2+>Cu2+>Cd2+.
李延斌 高保娇 杜瑞奎. 亚氨乙酸型螯合吸附材料IAA-PEI/SiO2对重金属离子的螯合吸附行为[J]. , 2011, 11(2): 221-226.
LI Yan-bin GAO Bao-jiao DU Rui-kui;. Chelating Adsorption Behavior of Imido-acetic Acid-type Composite Chelating Adsorption Material IAA-PEI/SiO2 for Heavy Metal Ions. , 2011, 11(2): 221-226.