The Synthesis And Adsorption Properties Of Chelating Resin Modified By Thiosemicarbazide

Thiosemicarbazide with a very high concentration of S and N can be used in modification of resin; directly applied in polymerization, the production could be used in preparing chelating resin which has high adsorption capacities.Modified crosslinked polyacrylamide was prepared by Mannich reaction using thiosemicarbazide.FT-IR spectroscopic analysis confirmed its structure. The adsorption capacities, adsorbing rates and adsorbing kinetics of the resin for Ag(â… ),Pb(â…¡),Hg(â…¡),Zn(â…¡) were determined by atomic adsorbing spectrometry and titration respectively. It was found that the resin had high adsorption capacities for Ag(â… ). The adsorption isotherms approximately fit the Langmuir equation within the range of experimental concentrations.Macroporous glycidyl methacrylate-divinylbenzene copolymer beads were synthesized with toluene as porogenic agen by suspension copolymerization. Macroporous glycidyl methacrylate-divinylbenzene copolymer was modified by thiosemicarbazide. The composition and structure of the resin were characterized by elemental analysis and infrared spectrometry. The adsorption capacities, adsorbing rates and adsorbing kinetics of the resin for Ag(â… ),Pb(â…¡),Hg(â…¡),Zn(â…¡) were determined by atomic adsorbing spectrometry and titration respectively. It was found that the resin had high adsorption capacities for Ag(â… ).The adsorption behavior corresponded to Langmuir and adsorbing equation in dilute concentration range.A novel chelating resin based on thiosemicarbazide and formaldehyde aqueous was synthesized through one step reaction. The composition and structure of the resin were characterized by elemental analysis and infrared spectrometry. The adsorption capacities, adsorbing rates, adsorbing selectivity and adsorbing kinetics of the resin for Au(III),Ag(â… ),Zn(II),Pb(II),Hg(â… ) were determined by atomic adsorbing spectrometry and titration respectively. It was found that the resin had relatively high adsorption capacities and rates for Au(III) and Ag(â… ) compared to resins reported work. The resin had a particular adsorbing selectivity for Au(III) from its mixed solutions of some other metallic ions. The adsorption behavior corresponded to Langmuir adsorbing equation in dilute concentration range.