ABSTRACT

A method of chemically bonding copper ferrocynide (CuFC) to the surface of a PVDF hollow-fibre membrane (PVDF-CuFC) was designed and the resulting PVDF-CuFC was applied to the effective removal of aqueous cesium (Cs). In order to chemically immobilize CuFC on the surface of the PVDF hollow-fibre membrane, carboxyl groups were introduced onto the membrane surface (PVDF-COOH) to peptide bond with amine groups from CuFC. The introduction of the carboxyl group onto the surface of the PVDF hollow-fibre membrane was confirmed by Fourier-transform infrared spectroscopy (FT-IR), while the immobilization of CuFC was confirmed by scanning electron microscopy with energy dispersed spectroscopy, FT-IR, and thermogravimetric analysis. The PVDF-CuFC showed higher Cs adsorption kinetics and adsorption capacity than PVDF-COOH. Moreover, as the initial pH increased, the amount of Cs adsorption by PVDF-CuFC also increased. However, the amount of Cs adsorption at pH 10 was slightly less. The applicability of PVDF-CuFC as a filter type adsorbent for the treatment of a Cs-contaminated water source is demonstrated by continuous filtration experiments.

摘要

设计了一种将亚铁酸铜 (CuFC) 化学键合到 PVDF 中空纤维膜 (PVDF-CuFC) 表面的方法，并将所得的 PVDF-CuFC 应用于有效去除水中的铯 (Cs)。为了将 CuFC 化学固定在 PVDF 中空纤维膜的表面，将羧基引入膜表面 (PVDF-COOH) 以与来自 CuFC 的胺基形成肽键。通过傅里叶变换红外光谱 (FT-IR) 证实了羧基在 PVDF 中空纤维膜表面的引入，而通过扫描电子显微镜和能量色散光谱、FT-IR 证实了 CuFC 的固定化，和热重分析。PVDF-CuFC 表现出比 PVDF-COOH 更高的 Cs 吸附动力学和吸附容量。而且，随着初始 pH 值的增加，PVDF-CuFC 对 Cs 的吸附量也增加。然而，在 pH 10 的 Cs 吸附量略少。连续过滤实验证明了 PVDF-CuFC 作为过滤型吸附剂处理 Cs 污染水源的适用性。