Preparation, properties, and applications of modified polyurethane foam from persimmon tannin powder

In this study, the persimmon tannin powder modified polyurethane foam (PTP-PUF) was synthesized. The morphology of the foam was observed by SEM, the thermodynamic stability and mechanical properties of PTP-PUF were discussed for application. The effect of persimmon tannin powder content and initial pH on Cu(II) and Pb(II) biosorption on PTP-PUF was investigated. The adsorption equilibrium data for Cu(II) and Pb(II) fitted the Freundlich model and Langmuir model well, respectively. And the maximum adsorption capacity of PTP-PUFs for Cu(II) and Pb(II) ions were 96.06 and 112.2 mg/g at pH 5 and 323 K. The kinetic data was tested using pseudo-first-order and pseudo-second-order models. The results suggested that the pseudo-second-order model was the best one to describe the adsorption behavior of Cu(II) ( R 2 > 0.997) and Pb(II) ( R 2 > 0.985) onto PTP-PUF.