Application Of Copolymer-functionalized Magnetic Solid Phase Extractant In The Preconcentration Of Trace Vanadium Ions In Water

Pentavalent vanadium?V?V??,as one of the common hazardous elements,can significantly damage the health of animals and human beings along with the accumulation of trace-level vanadium intake.Traditional analysis methods,such as liquid-liquid extraction and solid phase extraction,have some shortcomings in fast pretreatment and detection.The excess consumption of organic solvents as well as the laborious operations is still a roadblock to extension of the further application.For solid-phase extraction,although the large-scale use of organic solvent is avoided,the tedious column operation is still inevitable.Currently,magnetic solid phase extraction?MSPE?is increasingly used in pollutant removal.It avoids the shortcomings of solid phase extraction and liquid-liquid extraction.Besides,it combines the advantages of solid phase extraction and magnetic materials together,such as the advantages of short processing time,environment-friendly preparation,low cost and convenient operations.Some magnetic materials,such as Fe₃O₄ nanoparticals,are often used as the magnetic cores because of their excellent magnetic performance,low toxicity and easy preparation process,which can be easily separated from the solution under the presence of external magnetic field.In this work,we successfully developed a magnetic solid phase extraction?MSPE?approach to achieve effective and efficient pretreatment and quantification analysis of the V?V?ions in water samples using our prepared novel Fe₃O₄-based copolymer magnetic sorbent.Firstly,Fe₃O₄ nanoparticles were synthesized by reduction method,and then the Fe₃O₄@METAC-MBA magnetic sorbent was synthesized by polymerization of[2-?methacryloyloxy?-ethyl]trimethylammonium chloride?METAC?and N,N'-methylenebisacrylamide?MBA?with prepared Fe₃O₄ nanoparticles,and comprehensively characterized by XRD,FT-IR,SEM,TEM,XPS and SQUID-VSM.The structure of Fe₃O₄ was proved to be coated by the copolymer,and quaternary ammonium functional groups were successfully introduced into the functional magnetic solid phase adsorbent characterized by the XPS.SQUID-VSM shows that it is a soft magnetic material.The copolymer functional magnetic adsorbent can reach adsorption equilibrium in about 10 min with the high adsorption capacity of 248.1 mg/g and can be separated from the sample solution using the magnet.The separated copolymer functional magnetic solid-phase adsorbent was eluted by the eluent consisting of NaOH and NaCl?concentration of each component:1.0 mol/L?,and then washed with deionized water for recovery.The adsorption recovery rate remains stable within five using times?over 98%?.Thus,with the impressive preconcentration performance and considerable reusability,Fe₃O₄@METAC-MBA would be a potential MSPE material in the pretreatment and fast detection of trace metal ions in the fields of analytical and environmental chemistry.