Study On The Synthesis Of New Adsorption Materials Via SI-ATRP And Their Properties

This paper was prepared the high adsorption capacity chelating resin by a new technology atom transfer radical polymerization. The chloromethylation polystyrene resin was used as the macroinitiator.Three different kinds of nitrogen monomers will be grafted to the surface of polystyrene. The adsorption properties of the three new chelating resins were investigated in details, the satisfactory results have been obtained. The work was done as follows:1. A new high-capacity IDA chelating resin was synthesized via surface-initiated atom transfer radical polymerization (SI-ATRP) method. Glycidyl methacrylate (GMA) was grafted onto the surface of the chloromethyl polystyrene resin by SI-ATRP using the organic metal compound formed in the CuBr/2,2’-bipyridine (Bpy) system as catalyst at room temperature. The IDA chelating resin was synthesized by grafting Iminodiacetic acid (IDA) on the surface of polyglycidyl methacrylate (PGMA) modified polystyrene resin. The chelating resin was characterized by means of elementary analysis,and evaluated in details to determine its adsorption properties and parameters of kinetics and the thermodynamics. The amount of IDA on the surface of polystyrene resin was calculated to be8.15mg/m2. Adsorption capacity of copper (Ⅱ) increased with increasing initial metal ion concentration and temperature, and its highest value was1339.66mg/g at pH2.2. The experimental results showed that the equilibrium adsorption data fitted well to both Langmuir and Freundlich isotherms. The thermodynamic equilibrium functions were also determined. AG<0.AH=270.60kJ/mol,△S>0.so the adsorption was spontaneous.endothermic and entropy increasing. The kinetic experimental datas were correlated with second-order kinetic model.2. A new high-capacity imidazole type chelating resin was synthesized via surface-initiated atom transfer radical polymerization (SI-ATRP) method.1-Vinylimidazole (VIM) was grafted onto the surface of the chloromethyl polystyrene resin by SI-ATRP using the organic metal compound formed in the CuBr/2,2’-bipyridine (Bpy) system as catalyst at room temperature. The chelating resin was characterized by means of elementary analysis, and evaluated in details to determine its adsorption properties and parameters of kinetics and the thermodynamics. The amount of VIM on the surface of polystyrene resin was calculated to be1.008mg/m2. Adsorption capacity of cadmium (Ⅱ)、zincion(Ⅱ) increased with increasing initial metalion concentration and temperature,the highest value of cadmium (Ⅱ) was653.10mg/g at pH3.6and the highest value of zincion(Ⅱ) was793.26mg/g at pH2.4. The experimental results showed that the equilibrium adsorption data fitted well to both Langmuir and Freundlich isotherms. The thermodynamic equilibrium functions were also determined.△G<0,△H=24.49kJ/mol,△S>0, so the adsorption was spontaneous, endotherrnic and entropy increasing. The kinetic experimental datas were correlated with second-order kinetic model.3. A novel high adsorption capacity materials was preparated by surface-initiated atom transfer radical polymerization (SI-ATRP) method.The melamine molecular brushes was grafted to the surface of the chloromethyl polystyrene resin,which was used as macroinitiator.The study discussed the adsorptive property and kinetic parameters of this chelate resin in details. Adsorption capacity of lead(Ⅱ) can achieve the maximum in pH5.0buffer system and its highest value was612.84mg/g. The experimental results showed that the equilibrium adsorption data fitted well to both Langmuir isotherms. The kinetic experimental datas were correlated with second-order kinetic model. Elution and regeneration experiments have shown that adsorption and elution of lead(Ⅱ) is fast, and the adsorption performance is good.