Synthesis And Application On Au(?) Of The Thiosemicarbazide Chelating Ion Exchange Fiber

A novel sulfur ion exchange fiber-thiosemicarbazide chelating ion exchange fiber(TSCIEF) was prepared by nucleophilic substitution reaction of chloramethylated polypropylene graft styrene(CPP-g-St) fiber and thiosemicarbazide, using anhydrous ethanol as swelling agent. Factors affecting the adsorption capacity of TSCIEF synthesized from CPP-g-St fiber, such as solution temperature, reaction time, bath ratio(solvent:solid, V:m), concentration of thiosemicarbazide and volume fraction of ethanol were investigated. The structure of TSCIEF was characterized through IR, TG, DTG and SEM testing. The adsorption capacity of TSCIEF on Au(?) were evaluated.Static adsorption experiments showed that the Au(?) adsorption on TSCIEF is a rapid process, which can reach adsorption equilibrium in 30 min when the temperature is 20 ?, and the adsorption capacity can get 135.8 mg g-1. The proper pH value is 2.0, and as the temperature and the initial concentration of Au(?) heighten, the adsorption capacity get larger accordingly. TSCIEF has a good selective adsorption capacity on Au(?), but for Cu(?), there almost has no adsorption when TSCIEF was put into the mixed solutions.Adsorption thermodynamics studies show that the equilibrium data fitted the best with Langmuir linear fitting isotherm, and the adsorption process of Au(?) on TSCIEF is easy-going, including both physisorption and chemisorption. The values of thermodynamic parameters, suggested that the adsorption of Au(?) on TSCIEF was a spontaneous, entropy-driven and endothermic process.Kinetics studies show that the adsorption process is fast. The datas get from different initial concentration of Au( ?) and different temperature fitted the best with pseudo-second-order rate equation.