Synthesis And Adsorption Properties Of Magnetic Fluorescent ZnS Composite Particles

With the development of science and technology,the polymer composites with both magnetism and fluorescence have got a lot attention,it’s been proved that they have great potential uses in various fields.In this paper,theα/ZnS andβ/ZnS composites were successfully synthesised by emulsion polymerization method or pyrolysis method respectively（αandβstand for Fe₃O₄-OA/PMMA/P（St&NVP）and Fe₃O₄-SC/Si O₂/P（St&NVP））.The morphology and structure of the composites mentioned above were characterized by IR,XRD and granulometer,and the results showed that C_α/ZnS and C_β/ZnS performed good fluorescence properties without fluorescence quenching,and their average particle sizes were 593.6 nm and 670.5 nm respectively.Theα/ZnS andβ/ZnS composites were further carbonized in tube furnace under the protection of nitrogen at high temperatures,then the two different magnetic fluorescent carbon sphere composites represented as C_α/ZnS and C_β/ZnS were collected and then characterized through IR,XRD,BET and granulometer.It’s been proved that the average particle sizes of C_α/ZnS and C_β/ZnS composites were556.9nm and 596.4nm respectively.And the adsorption capacities of C_α/ZnS andthe influences from contact time and temperature on the adsorption capacities were also investigated.Adsorption kinetics of the magnetic fluorescent carbon sphere composites towards Cu²⁺,Hg²⁺and phenol was fitted by quasi-first-order reaction equation and quasi-second order reaction equation,the results showed that the adsorption kinetics were corresponding with second-order reaction kinetics model.The fluorescence quenching effects from Cu²⁺and Hg²⁺to C_α/ZnS and C_β/ZnS composites were analyzed by fluorescent spectrometry.The results show that:when the magnetic fluorescent carbon sphere composites（0.01g）were added into solvents of Cu²⁺and Hg²⁺（40-120 mg/L）,the difference in the fluorescence intensity of C_α/ZnS and C_β/ZnS（F₀-F）could show great linear relation with the concentration of Cu²⁺and Hg²⁺.The detection limits of C_α/ZnS and C_β/ZnS towards Cu²⁺were 2.75mg/L and 5.53 mg/L,and those towards Hg²⁺were 3.92 mg/L and 4.36mg/L respectively.