Preparation and characterization of diatom-based As(Ⅴ) surface imprinted materials

Abstract

Using diatom as a material carrier, silane coupling agent aminopropyltrimethoxysilane (APS) was selected as the functional monomer, As (Ⅴ) was used as the template ion, and epichlorohydrin (ECH) was used as the crosslinking agent, the imprinted composite material with natural mineral material as carrier was prepared by the condensation reflux method. The results of scanning electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy and transmission electron microscopy show that the functional monomer APS is grafted successfully on the surface of diatom, and a stable imprinted pore forms after cross-linking with ECH. There are obvious grafts in the pores and surroundings of the diatom, and the internal regularity of the pores is more obvious. The selectivity coefficient of As (Ⅴ) imprinted composites under different binary systems was obtained by selective experiments. The selection ability and utilization prospect of As (Ⅴ) were summarized and evaluated based on experimental data.

Keywords

• diatom
• surface imprinting
• surface topography
• selectivity