摘要
将聚胺大分子聚乙烯亚胺(PEI)接枝于微米级硅胶微粒表面,制得接枝微粒PEI/SiO2,然后使氯乙酸与PEI大分子中的伯、仲胺基发生亲核取代反应,形成亚氨乙酸(IAA)型螯合吸附材料IAA-PEI/SiO2.研究了IAA-PEI/SiO2对重金属离子的螯合吸附行为和吸附机理.结果表明,由于亚氨乙酸基团与重金属离子之间的静电作用与配位螯合作用,IAA-PEI/SiO2对重金属离子可产生强的螯合吸附作用,对Ni2+的吸附容量可达1.4mmol/g;吸附过程为放热过程;在可抑制重金属离子水解的pH范围内,pH值越高,吸附能力越强;IAA-PEI/SiO2对重金属离子的吸附容量顺序为Ni2+>Pb2+>Cu2+>Cd2+.
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＋.
出处
《过程工程学报》
CAS
CSCD
北大核心
2011年第2期221-226,共6页
The Chinese Journal of Process Engineering
基金
山西省自然科学基金资助项目(编号:201002100843)
关键词
螯合吸附材料
亚氨乙酸型
聚乙烯亚胺
氯乙酸
重金属离子
composite chelating adsorption material
imido-acetic acid type
polyethyleneimine
chloroacetic acid
heavy metal ion
