Vigilancia Tecnológica

Abstract To enhance the adsorption capacity of polyvinyl alcohol (PVA) for heavy metals, PVA was selected as raw material and used glutaraldehyde as a crosslinking agent to obtain crosslinked polyvinyl alcohol (SPVA). Under alkaline conditions, SPVA and CS2 reaction was used to introduce the xanthate acid group into the SPVA polymer chain to prepare a new xanthate-modified polyvinyl alcohol adsorbent (DT-SPVA). The preparation conditions of DT-SPVA were optimized through single factor experiments, and response surface methodology (RSM). Fourier infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM-EDS) were used to evaluate the chemical structure and morphology of DT-SPVA. The results revealed that the optimal preparation conditions for DT-SPVA were: m(SPVA): m(CS2): m(NaOH)?=?1:0.67:2.70, preparation temperature of 47 ? and preparation time of 180 min. DT-SPVA exhibited a maximum removal rate of Cu (II) from the solution at 99.94% and an adsorption amount of 16.65 mg/g. The modification reaction in DT-SPVA preparation primarily occurs on the hydroxyl group (-OH) of the PVA molecular structure. The adsorption mechanism of Cu (II) depends on the coordination effect of the acid group (-CSSH) and hydroxyl (-OH) on Cu (II) as well as the ion exchange reaction. These results indicate that DT-SPVA has potential applications for the treatment of Cu (II) and other heavy metal ions.