摘要
【目的】提出一种制备疏水改性淀粉的新方法,为淀粉的进一步开发和综合利用提供理论依据。【方法】以玉米淀粉为原料,用高锰酸钾作氧化剂,制得氧化淀粉;通过离子交换反应,用溴化十六烷基三甲铵(CTMAB)对氧化淀粉进行疏水改性;研究了疏水改性淀粉对苯酚的吸附特性。【结果】氧化淀粉与CTMAB的离子交换反应符合一级反应。疏水改性淀粉的黏度随改性时间的延长呈先缓慢增加后急剧上升最后趋于稳定的变化趋势,说明交换量小时发生了分子内疏水性缔合作用,交换量大时发生了分子间疏水性缔合作用。与玉米淀粉和氧化淀粉相比,疏水改性淀粉的透光率明显下降,说明氧化淀粉疏水改性后分子变大。疏水改性淀粉对苯酚的吸附量随着CTMAB离子交换量的增加而增大,交换反应8 h时吸附量最大,表明分子间缔合增加了改性淀粉的疏水性,并相应地增加了其对有机物的吸附能力。【结论】获得了制备疏水改性淀粉的新方法,用该方法制备的疏水改性淀粉对水体中的有机污染物具有一定的吸附能力。
[Objective] A sort of new method to prepare hydrophobically modified starch was advanced, and provided theoretic basis for the starch further development application. [Method] Taking corn starch as raw material, the potassium permanganate was made as the oxidant, and the oxidized starch was prepared. Through the ionic exchange response,the oxidized starch was carried on the hydrophobically modifi cation with Cetyltrimethyl ammonium bromide （CTMAB）, and its phenol adsorption characteristics were studied. [Result] The ionic exchange reaction between the oxidized starch and the CTMAB conformed to the first order dynamic reaction. With the modified time extension, the viscosity of the hydrophobically modified starch slowly increased first ,then rose suddenly ,finally remained stable,indicating that when exchangable capacity is low,it is intramolecular associating;and when exchangeable capacity is high,it is intermolecular associating. Compared with the corn starch and the oxidized starch, the translucent rate of the hydrophobically modified starch dropped obviously,which indicates the molecules become bigger after hy drophobic modification. The absorbed amount of the hydrophobically modified starch for phenol increased with the increase of the CTMAB ionic exchange,ant it was the biggest after reaction 8 h,whieh showed the intermolecular association increases the modified starch hydrophobic, simultaneously increasing it to organic matter adsorptive capacity. [Conclusion] The new method of the hydrophobically modified starch has been obtained,and the hydrophobically modification starch has certain application potential in the organic waste water treatment aspect.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2009年第12期195-199,共5页
Journal of Northwest A&F University(Natural Science Edition)
基金
国家自然科学基金项目(40301021)
关键词
玉米淀粉
疏水改性
黏度
吸附
corn starch
hydrophobic modification
viscosity
absorption
