Preparation Of Environmentally Functional Materials For Specific Enrichment

Adsorbents play a vital role in the separation and enrichment of compound,as they can enrich targets from complex mixture system.At present,conventional adsorption materials have the drawback of lacking of selectivity,thus,a lot of researches have been done to improve the selectivity.The paper focuse on novel adsorption materials of excellent selectivity and easy separation:nanofibers have fast mass transfer kinetics and easy for separate,thus,it could be used to process a large number of samples in a short time,so the combination of electrospinning technology and molecular imprinting technology is to improve the defects of traditional molecularly imprinted polymers.Magnetic nanomaterials have several unique properties,such as extremely high specific surface area,good biocompatibility,easy for separation and easy for surface functionalization,so the boric acid is modified on the surface of magnetic nanomaterials for the separation and enrichment of cis-diol compounds.The main contents are as follows?1?The detection and adsorption of nitroaromatic compounds such as2,4-dinitrotoluene?DNT?is of great importance,but the selective detection of trace DNT in water remains a challenge.Here,molecularly imprinted polymer?MIP?nanofibers were fabricated by electrospinning using DNT as a template molecule and poly?allylamine?as a functional macromer.The results show that the nanofibers prepared using 20 wt%poly?ethylene terephthalate??PET?in solvent had a good morphology and an optimal the ratio of poly?allylamine?and DNT,and the imprinted nanofibers showed specific adsorption of DNT,in accordance with the Freundlich isotherm model and Scatchard analysis.Furthermore,the imprinted nanofibers showed remarkable stability and reusability,losing only 3%of their performance after eight cycles.Thus,the imprinted nanofibers fabricated by this strategy could be used for trace DNT extraction,separation,and further construction of sensors in the near future.?2?The study of protein and polysaccharide content in extracellular polymeric substances is helpful to improve the effect of activated sludge process on wastewater treatment..Thus,we herein report a facile and general approach for the preparation of boronic acid-functionalized magnetic nanoparticles for the selective enrichment of cis-diol compounds.More specifically,Fe₃O₄ magnetic nanoparticles were initially prepared via a solvothermal reaction,and core-shell-structured Fe₃O₄@SiO₂ nanoparticles were obtained according to a sol-gel process.Subsequently,the Fe₃O₄@SiO₂ surfaces were modified using4-formylphenylboronic acid to allow the formation of strong yet reversible covalent bonds between boronic acid?BA?and the cis-1,2-diol groups of glycoproteins.The obtained BA-modified Fe₃O₄@SiO₂ magnetic nanoparticles were applied in the attempted enrichment of two glycoproteins?ovalbumin?OVA?and transferrin?TRF??and two non-glycoproteins?bovine serum albumin?BSA?and cytochrome c?Cyt C??.The results confirmed a significant difference in affinity between glycoproteins and non-glycoproteins.In addition,the recognition capability of the Fe₃O₄@SiO₂-BA nanoparticles was demonstrated by the selective enrichment of glycoproteins from a complex system containing both glycoproteins?i.e.,TRF?and non-glycoproteins?i.e.,Cyt C?.