摘要
以丙烯酸为功能单体、苯乙烯为骨架单体、Pb2+为模板离子、采用无皂乳液聚合法合成铅离子印迹共聚物(Pb(Ⅱ)-ⅡPs)并采用紫外光谱、傅里叶变换红外光谱和扫描电镜对Pb(Ⅱ)-IIPs和非印迹聚合物(NIPs)的表面形貌和结构进行表征。以火焰原子吸收光谱法(FAAS)为检测手段,研究了Pb-IIPs对Pb2+的吸附和选择识别能力。结果表明,与NIPs相比,Pb(Ⅱ)-IIPs对Pb(Ⅱ)具有较好的特异吸附性能和选择性识别能力。在Cd(Ⅱ),Cu(Ⅱ),Mn(Ⅱ)和Zn(Ⅱ)存在下,其相对选择性系数分别达到6.25,6.18,6.25,6.38。在室温下,pH 6,吸附时间为2.5h时,吸附基本达到平衡,吸附率可达到96%。以3 mol.L-1的盐酸溶液作为解吸剂对含铅Pb(Ⅱ)-IIPs进行洗脱,吸率可达到98%以上。在最佳吸附条件下,其对Pb(Ⅱ)的吸附容量可达到40.2 mg.g-1。
With lead ion template,acrylic acid as functional monomer,potassium persulfate as initiator,strytrene as framework monomer,lead ion imprinted polymers（Pb（Ⅱ）-IIPs） were prepared using free emulsion polymerization method.The structure and morphology of the polymers were analyzed by UV-spectra,FTIR and scanning electron microscopy.The adsorption/desorption and selectivity for Pb2＋ were investigated by flame atomic absorption spectrometry（FAAS） as the detection means.The results show that compared with non-imprinted polymers（NIPs）,the Pb（Ⅱ）-IIPs had higher specific adsorption properties and selective recognition ability for Pb（Ⅱ）.The relative selectivity coefficient of Pb（Ⅱ）-IIPs for Pb（Ⅱ） was 6.25,6.18,6.25 and 6.38 in the presence of Cd（Ⅱ）,Cu（Ⅱ）,Mn（Ⅱ） and Zn（Ⅱ） interferences,respectively.The absorption rate was the best at the pH of adsorbent solution of 6,Adsorption rate reached 96% during the 2.5 h static adsorption time.Using 3.0 mol·L-1 HCl as the best desorption solvent to desorb the adsorbents,the desorbtion rate reached 98%.Under the best adsorption conditions,the adsorption capacity of Pb（Ⅱ）-IIPs for Pb（Ⅱ） was found to be 40.mg·g.-1
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2011年第6期1702-1706,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(20674066)资助
