Preparation Of Poly(Styrene-allylthiourea)/Titania Composite And Study On Adsorption Behaviors Of Heavy Metal Ions

Solid-phase extraction technology is a method of sample pretreatment with thecharacteristics of highly efficient, highly selective, less solvent and it is used to the field ofanalysis of heavy metals in the water. It is paid more and more attention by the analysts ofworkers.There are many types of SPE sorbents which are used for adsorption of heavy metalions.Research shows that organic/inorganic nanocomposites is superior to other adsorbent.Ithas very good prospects for development in solid-phase extraction.In the paper,the surface ofnano-titanium dioxide was treated with KH-570to obtain the double functional group ofpolymer. Polystyrene-allyl thiourea/titanium dioxide composite material was syntheszed fromstyrene and allyl thiourea with AIBN as initiator.The structure, surface morphology andelemental composition of the material was investigated by IR, SEM and EDS.Solid-phasemicro-extraction column was made with polystyrene-allyl thiourea/titanium dioxidecomposite material to investigate enrichment of trace heavy metals.The target compoundswere eluted by the mixed liquor of nitric acid and triethanolamine.The content of Cu2+、Pb2+、Cr3+and Hg2+were determined with ICP-MS. The influence of column adsorptiveperformance were analyzed by pH, the type of eluant and the flow velocity. The bestadsorption conditions was determined.The results showed that it had a good adsorptionperformance to Cu2+、Pb2+、Cr3+and Hg2+.The adsorption capacity were17.32mg/g、16.52mg/g、13.34mg/g、18.96mg/g respectively.The concentration of Cu2+、Pb2+、Cr3+andHg2+were determined with ICP-MS.The limit of detections were0.21μg/L、0.13μg/L、0.30μg/L、0.17μg/L repectively.