Abstract:

The poly methyl acrylic acid（PMAA）was grafted on the surface of micron-sized silica gel with the method of “graft from” to prepare grafted particles PMAA/SiO₂.The chemical structure of the grafted particle was characterized by means of infrared spectroscopy（FTIR）and the grafted particle was observed by metalloscope photograph.The adsorption of arginine on the grafted particles PMAA/SiO₂ was studied with batch method.The effects of the main factors such as pH value of the medium，ion strength and temperature on the adsorption property of PMAA/SiO₂ were investigated.The experimental results showed that the functional composite-type particles PMAA/SiO₂ exhibit strong adsorption ability for the alkaline amino acids，whereas the adsorption ability for the acidic amino acids is weak.The adsorption capacity of PMAA/SiO₂ for arginine has a maximum value at pH=7，which is 239 mg·g^-1.The adsorption capacity decreases with the increase of temperature and salinity.

Key words:

氨基酸, 甲基丙烯酸, 接枝微粒, 吸附

摘要：

采用接枝法将甲基丙烯酸（MAA）接枝于微米级硅胶表面，制得了接枝有甲基丙烯酸的接枝微粒PMAA/SiO₂，采用红外光谱（FTIR）对其化学结构进行了表征，用金相显微镜观察了接枝微粒的形貌。采用静态法研究了功能微粒PMAA/SiO₂对碱性氨基酸精氨酸吸附性能，考察了介质pH、离子强度及温度对其吸附性能的影响，探索了吸附机理。研究结果表明，在较大的pH范围内，接枝微粒PMAA/SiO₂对碱性氨基酸精氨酸表现出很强的吸附能力，而对酸性氨基酸的吸附能力则很弱; 随着介质pH值的增大，PMAA/SiO₂对精氨酸的吸附能力呈现先增强后减弱的规律，在pH=7处，吸附容量可以达到239 mg·g^-1;温度升高，吸附容量减小; 盐度增大，吸附容量降低。

关键词:

氨基酸, 甲基丙烯酸, 接枝微粒, 吸附