Abstract

Sorption of histidine in the cationic and zwitterionic forms on a framework aluminosilicate, clinoptilolite, has been investigated. The contributions of the exchange and nonexchange mechanisms of sorption to the sorption capacity have been determined. It has been shown that monolayer histidine sorption on clinoptilolite by the ion-exchange mechanism proceeds due to the electrostatic interaction between \({\text{NH}}_{3}^{ + }\) groups of the amino acid and electronegative sites of the sorbent matrix. In the region of equivalent exchange, a smaller value of the ion-exchange component of the sorption of histidine zwitterions is due to the Coulomb repulsion between the dissociated carboxyl groups of the amino acid and the negatively charged aluminum–oxygen clinoptilolite matrix. The isotherm of histidine sorption from dilute solutions has been described using the Langmuir theory. The equilibrium sorption parameters have been found. It has been concluded that polymolecular layers of the amino acid are formed as a result of association via hydrogen bonding, as well as dipole–dipole and hydrophobic interactions.

中文翻译：

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组氨酸在斜发沸石上的平衡吸附

摘要

已经研究了阳离子和两性离子形式的组氨酸在骨架铝硅酸盐斜发沸石上的吸附。已经确定了吸附的交换和非交换机制对吸附能力的贡献。已经表明，由于\（{\ text {NH}} _ {3} ^ {+} \之间的静电相互作用，通过离子交换机理进行的单层组氨酸吸附在斜发沸石上基团的氨基酸和吸附剂基质的负电性位点。在等价交换区域，组氨酸两性离子吸附的离子交换成分的较小值是由于氨基酸的解离羧基与带负电荷的铝氧斜发沸石基质之间的库仑排斥作用。使用Langmuir理论已经描述了从稀溶液中吸收组氨酸的等温线。已经找到平衡吸附参数。已经得出结论，氨基酸的多分子层是通过氢键结合以及偶极-偶极和疏水相互作用而形成的。