The Synthesis Of Functionalised Nano Silica Gel As Solid Phase Extractant And Their Adsorption Properties For Trace Metal Ions

The main work presented in this dissertation comprises three parts:First,three functionalized nano silica gel materials(FNSiG-â… ,FNSiG-â…¡,FNSiG-â…¢) were prepared.These silica gel materials and the related intermediates were fully characterized.These three materials as sorbents have been investgated for the quantitative separation and preconcentration of trace amounts of Fe(â…¢),Cu(â…¡),Zn(â…¡), Cd(â…¡),Cr(â…£),Hg(â…¡),Pb(â…¡),Co(â…¡),Ni(â…¡) and Ag(â… ).After the applications of FNSiG-â… ,â…¡,â…¢as solid phase extractors for trace metal ions in optimization conditions,we found they can selectively separated Pb(â…¡),Ag(â… ) from the other six coexisting metal ions with FNSiG-â… ,â…¡,â…¢in pH 5,especially for Pb(â…¡).The lowest extraction ratio for these two ions is 66%,the highest one can be neary 99%.In pH 1, they also can selectively separated Ag(â… ),the extraction ratio are 88.5±0.3 for FNSiG-â… ,39.2±1.4 for FNSiG-â…¡,99.6±0.4 for FNSiG-Ⅲ。Second,ligand L' was prepared by futher modified L with 2-(chloromethyl)pyridine.A series of metal complexes related to L and L' were prepared.These complexs were characterized by micro analysis and X-Ray single crystal diffraction analysis.The UV/vis spectra and electrochemistry property of these complexes were researched.Finally,the Cu(â…¡)-complex:[CuL(NCMe)]²⁺ selectively recognizes iodide was discussed.