Study On Cefalexin Detection And Its Adsorption Performance Based On Mesoporous Materials

In recent years,the problem of antibiotic abuse has drawn the attention of more and more scientists in the world.At present,the detection of trace antibiotics in drinking water and the effective treatment of antibiotic wastewater are urgent.Therefore,it is important to find new detection technologies and wastewater treatment methods.Due to its unique microstructure and excellent thermal and chemical stability,mesoporous materials have shown potential applications in adsorption,drug delivery and catalysis.Mesoporous materials have no fluorescent,the surface are inert and the reactivity low.By combining with the fluorescent material,they can function as fluorescent probes used in the field of detection.The main contents are shown as follows:1)A fluorescence-enhanced functionalized mesoporous material,SNT,was prepared by grafting tris(4-bromo)aniline(TBPA)onto the pore of mesoporous material SBA-15based on the"limiting fluorescence enhancement"for detection of antibiotics cepfalexin.The TBPA molecule is covalently attached to the aminated SBA-15 by immobilizing it in the pores of SBA-15.The intramolecular TBPA molecules are restricted by the intramolecular rotation(RIR)Strong fluorescence,we call it"limiting fluorescence enhancement."We used SNT as a probe to detect trace cepfalexin in drinking water,explored the performance of trace antibiotics,and proved that the detection method is simple and the detection effect is sensitive and efficient.2)Mesoporous carbon spheres(MCNs)were prepared based on the"pyrolysis-deposition"strategy and applied to adsorb the antibiotic cefalexin.In this method,the pyrolyzed exhaust gas of the resin polymer(RF)was used as the carbon source during the high-temperature carbonization process.Fe-containing hollow mesoporous silica nanospheres(Fe@HMSNs)was used as a hard template.The synthesis process is simply accomplished in one tube furnace,in which the exhaust gas is pyrolysed from resin polymer and synchronously deposits on Fe@HMSNs and converts to carbon under the catalysis of Fe.The MCNs have a high pore volume and specific surface area of1.7 cm~3/g and 1240 cm~2/g,respectively;The pore size are distributed at 4.1 nm.We studied the adsorption properties of MCNs.The adsorption kinetics and adsorption isotherms were used to further analyze the adsorption capacity and application prospects.3)Using a nontoxic,cheap and available?-cyclodextrin(?-CD)as carbon source,melamine(MF)as nitrogen source,triblock copolymer P123,F127 and tetraethylorthosilicate(TEOS)as common templates.After sol-gel,carbonization and remove of templates,the nitrogen-doped bimodal mesoporous carbons(NBMCs)were successfully synthesized by hydrothermal method.The pore volume and specific surface area of NBMCs were 1.2 cm~3/g and 622 m~2/g.The mesopores were centrally distributed at4.1 nm and 11.5 nm,respectively.We studied the adsorption properties of NBMCs,the experiment combined with adsorption kinetics and adsorption isotherms further analysis of the adsorption capacity and application prospects.