Oxadiazole-Functionalized Polyacrylonitrile Fiber as Selective Adsorbent for Mercury Ion

Abstract

A new oxadiazole-functionalized polyacrylonitrile fiber (PAN_AOF) was successfully fabricated by immobilizing the organic molecule 2-chloromethyl-5-phenyl-1,3,4-oxadiazole on aminated fiber (PAN_AF). The fibers were characterized completely by Fourier-transform infrared spectroscopy, elemental analysis, X-ray diffraction, and X-ray photoelectron spectroscopy techniques. Compared with PAN_AF, PAN_AOF showed a higher adsorption capability for Hg²⁺ ions in aqueous solutions. The functionalized fiber PAN_AOF exhibited a highly selective adsorption for Hg²⁺ when coexisting with other metal ions viz. Pb²⁺, Cd²⁺, Cu²⁺, Zn²⁺, Ni²⁺, Co²⁺, Cr³⁺, Ca²⁺, and Mg²⁺. The PAN_AOF presented the best adsorption capacity for Hg²⁺ at pH 5. Moreover, the adsorption experimental data fit well with the pseudo-second-order kinetic model and Langmuir isotherm. Notably, the PAN_AOF almost retained its original adsorption capacity (112 mg/g) after five cycles, indicating its excellent reusability in practical applications.

Keywords

Polyacrylonitrile fiber / Mercury / Adsorption / 1,3,4-oxadiazole / Selectivity

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