乳液交联法制备多孔淀粉及其吸附性能

Preparation and adsorption properties of porous starch prepared by emulsion crosslinking method

以可溶性淀粉为原料,用环己烷为油相的油包水乳液,通过交联反应成功制备了多孔淀粉。通过实验,优化了环己烷的加入量。扫描电镜显示多孔淀粉的表面有大量微孔;红外光谱扫描表明交联成功,并且大量羟基仍然存在;X射线衍射光谱分析结晶度大大降低。多孔淀粉的比表面积为3.456m2/g,吸油率高达162%,对亚甲基蓝的最大饱和吸附量是145mg/g;相比酶解法制备的多孔淀粉,本文提出的乳液交联法制备的多孔淀粉的比表面积提高了1.6倍,吸油率提高了0.7倍,对亚甲基蓝的最大饱和吸附量提高了近4倍。多孔淀粉通过氢键作用吸附染料亚甲基蓝和碱性品红,且是一个快速平衡的过程。

Porous starch was prepared by crosslinking from soluble starch through water-in-oil emulsion,with cyclohexane as the oil phase. The amount of cyclohexane was optimized by experiment. A large number of micropores could be seen with scanning electron microscopy. FTIR scanning showed that crosslinking reaction was successful,and a large number of hydroxyl groups still remained. XRD analysis showed that crystallinity was reduced greatly. The specific surface area of the porous starch was 3.456m2/g,oil absorption rate was up to 162%,and the maximum saturated adsorption capacity for methylene blue was 145mg/g. Compared with the porous starch prepared by the enzymatic hydrolysis method,the specific surface area of the porous starch increased 1.6 times,oil absorption rate increased 0.7 times,and maximum saturation adsorption capacity for methylene blue increased nearly 4 times. Through hydrogen bonding,the porous starch adsorbed methylene blue and fuchsin,as a rapid equilibrium process.