摘要
以吡嘧磺隆为模板分子,α-甲基丙烯酸为功能单体,偶氮二异丁腈为引发剂,三甲氧基丙烷三甲基丙烯酸酯为交联剂,合成了吡嘧磺隆分子印迹聚合物;并比较了3种不同致孔剂和致孔剂体积对所合成的聚合物吸附量和颗粒度的影响。结果表明,采用二氯甲烷为致孔剂制备的吡嘧磺隆印迹聚合物的吸附量均高于采用正己烷和正己烷/二氯甲烷(体积比为1∶1)为致孔剂的,致孔剂的用量对聚合物吸附量的影响不明显,但对聚合物的粒径影响比较明显;以36 mL二氯甲烷为致孔剂制备的聚合物的颗粒度最大,D50为5.36μm,吸附量为3321.29μg/g。对该聚合物进行扫描电镜、红外光谱表征及选择性吸附实验,结果表明该聚合物形成了明显的印迹位点,且对吡嘧磺隆、苄嘧磺隆、苯磺隆、甲磺隆和烟嘧磺隆的吸附量分别为1146.19、1044.21、1087.27、1051.92和1023.89μg/g,其中对吡嘧磺隆的吸附量最高。
Pyrazosulfuron-ethyl molecularly imprinted polymers(PS-MIPs) have been synthesized by the molecular imprinting technique using pyrazosulfuron-ethyl(PS) as the template molecule,methacrylic acid(MAA) as the functional monomer,azobisisobutyronitrile(AIBN) as the initiator and trimethylolpropane trimethacrylate(TRIM) as the cross-linking agent. Three different porogens were used to synthesise PS-MIPs,and the effect of porogen volume on the adsorption capacities and the particle size of the MIPs were evaluated. The results showed that the MIPs that utilised dichloromethane as the porogen exhibited higher binding capacities than those prepared with n-hexane or n-hexane: dichloromethane(volume ratio 1∶ 1). The porogen volume had little effect on the adsorption capacities,but it clearly affected the particle size. The largest particle size was obtained for MIP3(D 50 = 5. 36 μm) when 36 mL of dichloromethane was used as the porogen and the materials also had a high adsorption capacity of 3321. 29 μg/g. The polymers were studied by scanning electron microscopy and infrared spectroscopy and the imprinting sites in MIP could be clearly observed. The PS-MIPs synthesized by the above method showed high selectivity for PS in selective adsorption experiments. The adsorption capacity of PS-MIPs for PS,bensulfuron-methyl(BSM), tribenuron-methyl(TBM), metsulfuron-methyl(MSM) and nicosulfuron(NS) were 1146. 19,1044. 21, 1087. 27,1051. 92 and 1023. 89 μg/ g,respectively.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第1期46-51,共6页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学青年基金(31101294)
江西省自然科学基金(2010GZN0030)
江西省教育厅青年基金(GJJ10106)
关键词
吡嘧磺隆
分子印迹聚合物
红外光谱
吸附量
pyrazosulfuron
molecularly imprinted polymer
infrared spectroscopy
adsorption capacity
