Preparation of Selective Sorbents for Selenium(IV)and Selenium(VI)Composed of Lysine-Peptide and Porous Silica using Molecular Imprinting Technology

摘要

Selenium,which has been widely used in photosensitive materials,semiconductors,and insecticides,can be released into the environment from discharge of industrial wastewater and agricultural runoff.Although selenium is a trace essential element for cellular functions in many organisms including human,the intake of a large amount of selenium causes adverse health issues.Therefore,the maximum contaminant level in tap water is set out below 10 μg/L in many countries,and effective methods are needed to remove the contaminant Se from environmental water.We have developed a novel molecular imprinting method to prepare silica particles that can highly selectively recognize target elements,using peptides composed of histidine residues for molecular recognition and 3,4-dihydroxyphenylalanine(DOPA)and lysine residues for solid adhesive characteristics.In the present study,we applied this method to prepared adsorbents that imprinted selenite and selenate ions using peptides,in which the molecular recognition site was consisted of lysine residues instead of histidine residues(Figure 1),and examined their Se adsorption characteristics.