制备了对Cu2+具有高灵敏检测及分离回收功能的聚氯酯泡沫.首先采用荧光前驱体4-溴-1,8-萘二甲酸酐、乙醇胺和2-氨基-4-噻唑乙酸作为原料合成含有羟基和噻唑乙酸基团的小分子传感器N-乙醇-4-(4-噻唑乙酸)-1,8-萘二甲酰亚胺(ETN);再通过其上的羟基与甲苯-2,4-二异氰酸酯(TDI)的-NCO基团反应将小分子感应器化学链接到多孔的聚氨酯泡沫上.荧光分析表明接有小分子感应器ETN的聚氨酯泡沫吸附Cu2+离子后会发出荧光,荧光强度随Cu2+离子浓度增加而变强.当Cu2+离子的浓度低到10-7 mol/L数量级时也可检测到荧光.而且,多孔聚氨酯泡沫(当含1％的ETN)便具有37.66 mg/g回收Cu2+离子的能力,这使其具有在诸如废水和污水检测和分离Cu2+的潜能和价值.
Polyurethane bearing highly sensitive moiety is promising for detection and adsorption of Cu2+.In this work,a small molecular sensor was synthesized using 4-bromo-naphthalic anhydride,ethanolamine and 2-amino-4-thiazole acetic acid as reactants.Therefore,hydroxyl groups and thiazole acetic acid groups were grafted on the small molecular sensor.And then the small molecular sensor was anchored on porous polyurethane through the interaction between hydroxyl groups and-NCO groups.The fluorescence analysis shows that the fluorescence remains after the small sensor being introduced to the PU foam.Also,the fluorescent intensity of the porous polyurethane resin increases with the addition of Cu2+ ions.The limit of detection could reach as low as 10-7 mol/L.Moreover,the porous polyurethane foams (containing 1％ of sensor molecules) enable access to Cu2+ ions by the absorption capacity of 37.66 mg/g,which suggest that the porous polyurethane resin is potential to detect and separate Cu2+ from polluted water,such as waste water and sewage outlet.
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