摘要：

利用土豆淀粉、玉米淀粉、正硅酸乙酯为原料, 氨水为催化剂, 通过溶胶-凝胶法制备了淀粉/二氧化硅复合微球, 研究了该复合微球对水中铅离子的吸附性能。结果表明, 在弱碱性条件下, 淀粉/二氧化硅复合微球对水中铅离子表现出良好的吸附性能, 其对铅离子的吸附行为符合Langmuir模型和Freundlich模型, 对铅离子的饱和吸附量为31.34 mg/g.动力学研究表明, 淀粉/二氧化硅复合微球对铅离子的吸附符合拟二级动力学模型, 在淀粉/二氧化硅复合微球的活性点上的化学反应为吸附控制步骤。

关键词: 淀粉/二氧化硅复合微球, 重金属离子, 吸附

Abstract:

Starch/silica composite microspheres have been synthesized by sol-gel method using potato starch, corn starch, and TEOS as raw materials, and ammonia water as catalyst. Its adsorption capacity for lead (Ⅱ) ions in water is studied. The results show that starch/silica composite microspheres have perfect adsorption capacity for lead(Ⅱ) ions in water under weak alkaline condition. Its adsorption behavior for lead (Ⅱ) ions complies with Langmuir model and Freundlich model. Its maximum adsorption capacity for lead ions is 31.34 mg/g. The kinetics research shows that the adsorption of starch/silica composite microspheres for lead(Ⅱ) ions is in line with pseudo second kinetic model. The chemical reaction on the activity site of starch/silica composite microspheres is adsorption control steps.

Key words: starch/silica composited microspheres, heavy metal ions, adsorption

中图分类号: 

• X703