Fe^(3+)/N-(2-羟乙基)乙二胺阳离子复合淀粉微球的制备及工艺优化

Preparation and process optimization of Fe^(3+)/N-(2-hydroxyethyl)ethylenediamine cationic CSM

采用反相乳液聚合法制备了Fe^(3+)/N-(2-羟乙基)乙二胺阳离子复合淀粉微球(CSM),通过单因素探索实验和响应曲面设计优化,探讨了FeCl_(3)·6H_(2)O用量、N-(2-羟乙基)乙二胺(AEEA)用量、K_(2)S_(2)O_(8)/NaHSO_(3)用量、MBAA用量、复合乳化剂用量及反应温度等因素对CSM吸附Cr(Ⅵ)性能的影响。工艺最佳合成条件如下,以1.5g St为基准,AEEA为3.4665g,FeCl_(3)·6H_(2)O为5g,K_(2)S_(2)O_(8)/NaHSO_(3)用量为0.8g,MBAA 0.5g,复合乳化剂2.0g,反应温度为60℃。结果表明:CSM对水中Cr(Ⅵ)(100mg/L)的去除率可达85.74%,吸附量为17.15mg/g。通过红外光谱和扫描电镜等手段表征CSM,发现CSM形状规整,表面具有一定的粗糙度。

Fe^(3+)/N-(2-hydroxyethyl)ethylenediamine cationic starch microspheres(CSM)were prepared by reversed-phase emulsion polymerization.The effects of dosages of FeCl_(3)·6H_(2)O,N-(2-hydroxyethyl)ethylenediamine(AEEA),initiator,crosslinking agent and reaction temperature on the adsorption performance of Cr(Ⅵ)by CSM were investigated.The best technological conditions were:based on St with a mass of 1.5g,AEEA was 3.4665g,FeCl_(3)·6H_(2)O was 5g,K_(2)S_(2)O_(8)/NaHSO_(3)was 0.8g,MBAA was 0.5g,composite emulsifier was 2.0g,and the reaction temperature was 60℃.The results shown that the removal rate of Cr(Ⅵ)(100mg/L)by CSM can reach 85.74%,and the adsorption capacity was 17.15mg/g.Through the determination and characterization of CSM by FT-IR and SEM,it was concluded that the shape of CSM was regular and the surface had a certain roughness.