One-step Syntnesis of Quaternary Phosphonium Microspheres for Adsorption Au(S2O3)23-
Using triphenylphosphine(TPP)and chloromethyl polystyrene microspheres(PS-C1)as raw materials,phosphonium quaternary microspheres were prepared by one-step process and used for the recovery of Au(Ⅰ)in thiosulfate leaching system.In this paper,the influence of the properties of thiosulfate solution on the adsorption of Au(Ⅰ)by PS-QP was investigated,and the samples were characterized by FT-IR,BET,SEM-EDS and XPS,and the adsorption mechanism of Au(Ⅰ)on the surface of PS-QP was proposed.The results show that the adsorption of Au(Ⅰ)by PS-QP is almost unaffected by pH(pH=6～11).The adsorption of Au(Ⅰ)by PS-QP conforms to the pseudo-second-order kinetics and Langmuir model,and the theoretical load is 23.7 mg·g-1,which is close to the actual load(23.5 mg·g-1).PS-QP showed good cycling performance and actual application effect.After five sorption-desorption cycles,the single loading of Au(Ⅰ)was 7.0 mg·g-1,and the recovery rate of gold in the actual leaching solution was 91.7％.The mechanism of adsorption of Au(Ⅰ)by PS-QP is the anion exchange between Au(S2O3)23-in solution and Cl-on PS-QP to achieve the gathering of Au(Ⅰ)on PS-QP.pH and thiosulfate concentration have negligible effect on the loading capacity of gold,and adsorption and desorption virtually have no effect on the strength of PS-QP,which has good actual application potential in thiosulfate gold extraction process.
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