α,β-聚(N-2-羟乙基)-L-天冬酰胺的合成及对Pb^(2+)和Cu^(2+)螯合性能的研究  

SYNTHESIS OF α,β-POLY(N-2-HYDROXYETHYL)-LASPARTAMIDE AND ITS CHELATION PROPERTIES FOR Pb^(2+) AND Cu^(2+)

作　　者：马政生[1] 王芳[1] 吴雄岗[2] 肖明[1] 

机构地区：[1]西北大学化工学院,西安710069 [2]西安近代化学研究所,西安710065

出　　处：《离子交换与吸附》2013年第3期236-245,共10页Ion Exchange and Adsorption

基　　金：西安市产学研合作工程项目[CXY08007(2)]资助

摘　　要：以天冬氨酸热缩聚得到的聚琥珀酰亚胺(PSI)为原料,与乙醇胺通过氨解开环反应,合成了聚天冬氨酸的接枝衍生物α,β-聚(N-2-羟乙基)-L-天冬酰胺(PHEA)。用红外光谱表征了产物的结构;用凝胶色谱测定了分子量分布。研究了PHEA用量、pH值和金属离子初始浓度等对Pb2+和Cu2+去除率的影响,在pH=5.0时,Pb2+的最大去除率为92.48%;在pH=4.5时,Cu2+的最大去除率为89.34%。Pb2+和Cu2+最大静态螯合量分别为25.64mg/g和17.68mg/g。通过XPS分析得知,PHEA与Pb2+螯合时,氮原子和氧原子参与了反应;与Cu2+螯合时,主要是氧原子参与反应。Chemically grafted polyaspartic acid （PASP） derivative, α,β-poly（N-2-Hydroxyethyl）-L-aspartamide （PHEA）, was prepared by ethanolamine aminolysis of polysuccinimide （PSI） which was obtained from polycondensation of aspartic acid. The structure and relative molecular mass of PHEA were characterized by Fourier transform infrared spectrometry （FT-IR） and Gel permeation chromatography （GPC）, respectively. The effects of dosage of PHEA, pH and initial concentration of metal ions on the removal efficiency of Pb2＋ and Cu2＋ from aqueous solution in the presence of PHEA were investigated by static chelating adsorption. The maximum removal efficiency was 92.48% for Pb2＋ at pH 5.0 and 89.34% for Cuz＋ at pH 4.5 in 30 minutes and the maximum chelation capacity was 25.64mg/g for Pb2＋ and 17.68mg/g for Cu2＋. XPS studies indicated that Pb2＋ might be chelated via the nitrogen and oxygen of PHEA and Cu2＋ might be chelated via the oxygen of PHEA.

关 键 词：α β-聚(N-2-羟乙基)-L-天冬酰胺 聚琥珀酰亚胺 螯合 PB2+ CU2+ 

分 类 号：O633.221[理学—高分子化学]