Adsorption of a Biocolloid onto a Rigid Charged Surface: Characteristics of Functional Group, Membrane and Electrolytic Solution

生物膠體在帶電表面上的吸附：官能基、薄膜和電解質溶液的特性

郭勇志(Yung-Chih Kuo)

《Journal of the Chinese Institute of Chemical Engineers》 34卷2期 (2003/03) Pp. 177-186

https://doi.org/10.6967/JCICE.200303.0177

摘要

本文提出在電解質溶液系統中，表面覆蓋薄膜的生物膠體於帶電表面上的吸附模型，並估算陽離子、陰離子和固定電荷的大以及薄膜中非均勻的估定電荷分布對生物膠體吸附速率的效應。在相同的膜層固定電荷量下，點電荷模型低估了吸附所需的時間。若膜層的電荷非均勻性愈高，則吸附的速率愈慢。與線性的膜層電荷分布比較發現非線性的膜層電荷造成較慢的吸附速率。較薄的薄膜、更高的平均電荷濃度、愈小的電雙層介電係數、較大的陽離子、陰離子和固定電荷，都導致較慢的吸附速率。而離子大小對吸附速率的影響力，依次是，固定電荷＞陰離子＞陽離子。

並列摘要

A theoretical study on the rate of adsorption of a biocol1oidal particle onto a charged surface is investigated. Here, both a particle and a surface are immersed in an electrolyte solution. A biocolloid is imitated by an ion-penetrable membrane carrying a nonuniformly distributed fixed charge on a rigid core. The effects of sizes of charged species, including cations, anions, and fixed charge, were taken into account to more realistically reflect a colloidal system. The results of numerical simulations reveal that, based on a constant amount of fixed charge in the membrane layer, the classical point-charge model predicts a faster rate of fixed charge in the membrane layer, the classical point-charge model predicts a taster rate of longer the time required for biocolloidal adsorption. A nonlinear distribution of fixed charge results in a slower rate of adsorption than a linear one does in general. Thin membrane thicknesses, high average concentrations of fixed charge, low permittivity of the medium, and large sizes of cations, anions and fixed charge produce slow rates of adsorption. The influential order of the sizes of charged species for the adsorption rate is (size of fixed charge) ＞ (size of anion) ＞ (size of cation).

並列關鍵字

Adsorption ； Rate ； Biocolloid ； Nonuniform charge ； Size ； Electrolyte