酪氨酸在活性炭/水界面上的吸附

Adsorption of Tyrosine on Active Carbon/Water Interface

研究了不同 p H值介质中酪氨酸在活性炭上的吸附行为 .结果表明 ,p H值 4 .2～ 6.1时吸附量较大 ,在酪氨酸的等电点时吸附量最大 ;酪氨酸被吸附的主要形式是兼性离子 ;酪氨酸离子靠 Van der Waals力吸附在活性炭 /水界面上 .用介质 p

The adsorption of tyrosine from aqueous solution on the active carbon at varying pH values has been studied. The results indicate that: (1) the adsorption found to be pH dependent,within pH 2—4 it increases with pH, within pH 6—12 it decreases with pH, at pH 4.2—6.1 the adsorption reaches its maximum; (2) the tyrosine is adsorbed mainly in the form of zwitterion; (3) a certain amount of ions of tyrosine is also adsorbed with van der Waals interaction. These probably suggest that the solubility of tyrosine at IEP has minimum,and the ions and undissociated groups of tyrosine can be adsorbed on the surface of active carbon through van der Waals interaction.