A kind of Fe-polysilicate polymer, poly-silicic-ferric （PSF） coagulant was prepared by co-polymerization （hydroxylation of mixture of Fe^3＋ and fresh polysilicic acid （PS））, in which PSF0.5, PSF1 or PSF3 denote...A kind of Fe-polysilicate polymer, poly-silicic-ferric （PSF） coagulant was prepared by co-polymerization （hydroxylation of mixture of Fe^3＋ and fresh polysilicic acid （PS））, in which PSF0.5, PSF1 or PSF3 denotes Si/Fe molar ratio of 0.5, 1 or 3, respectively. The effects of Si/Fe ratio and reaction time （co-polymerization time or aging time） on the reaction mode between Si and Fe were studies, and the optimal species of PSF was evaluated by pH change during the preparation of PSF and coagulation tests. The results showed that the characteristics of PSF are largely affected by both reaction time and Si/Fe ratio. PSF is found to be a essential complex of Si, Fe, and many other ions. The reaction mode between Si and Fe differs with various Si/Fe ratios. The pH of PSF0.5, PSF1 or PSF3 tended to be stable when reaction time is 10, 25 or 55 rain, respectively, which is almost consistent with the time reaching the relative stable morphology that is just the optimal species of higher coagulation efficiency. The optimal reaction time reaching optimal species can be evaluated by measuring the pH change during the polymerization process.展开更多
A new polymer, poly-silicon-ferric with oxidization （PSFN） coagulant was produced by adding KMnO4 and stabilizer M to poly-silicon-ferric （PSF） coagulant. The micro properties of PSFN was investigated with optical...A new polymer, poly-silicon-ferric with oxidization （PSFN） coagulant was produced by adding KMnO4 and stabilizer M to poly-silicon-ferric （PSF） coagulant. The micro properties of PSFN was investigated with optical microscope, transmission electron microscope（TEM）, ultraviolet/visible absorption（UVA） scanning, infrared（IR） spectrometer and oxidation-reduction potential （ORP） meter respectively, compared to that of PSE The coagulation behavior by PSFN was investigated compared to that by PSF. The results show that the micro properties of PSF have been changed greatly due to the addition of KMnO4, and there exists KMnO4 unattached in PSFN. A kind of tetrahedron structure somewhat like the connection of Si-O-Si bonds may be formed by the complexation of Mn （maybe in various valence） with PSE PSFN has lower turbidity removal than PSF at lower dose and achieves the same when the dose reaches a definite amount, while the removal of UV254 by PSFN is higher than that by PSF almost over entire dose range with the largest difference of about 17%. PSFN has more oxidization function at acidic condition than that at basic condition, and gives stronger ability of application for treating various waters than that by PSE.展开更多
基金Project supported by the National Basic Research Projects (973) of China(No.2004CB418500).
文摘A kind of Fe-polysilicate polymer, poly-silicic-ferric （PSF） coagulant was prepared by co-polymerization （hydroxylation of mixture of Fe^3＋ and fresh polysilicic acid （PS））, in which PSF0.5, PSF1 or PSF3 denotes Si/Fe molar ratio of 0.5, 1 or 3, respectively. The effects of Si/Fe ratio and reaction time （co-polymerization time or aging time） on the reaction mode between Si and Fe were studies, and the optimal species of PSF was evaluated by pH change during the preparation of PSF and coagulation tests. The results showed that the characteristics of PSF are largely affected by both reaction time and Si/Fe ratio. PSF is found to be a essential complex of Si, Fe, and many other ions. The reaction mode between Si and Fe differs with various Si/Fe ratios. The pH of PSF0.5, PSF1 or PSF3 tended to be stable when reaction time is 10, 25 or 55 rain, respectively, which is almost consistent with the time reaching the relative stable morphology that is just the optimal species of higher coagulation efficiency. The optimal reaction time reaching optimal species can be evaluated by measuring the pH change during the polymerization process.
基金Supported by National Program on Key Basic Research Projects (2004CB418500).
文摘A new polymer, poly-silicon-ferric with oxidization （PSFN） coagulant was produced by adding KMnO4 and stabilizer M to poly-silicon-ferric （PSF） coagulant. The micro properties of PSFN was investigated with optical microscope, transmission electron microscope（TEM）, ultraviolet/visible absorption（UVA） scanning, infrared（IR） spectrometer and oxidation-reduction potential （ORP） meter respectively, compared to that of PSE The coagulation behavior by PSFN was investigated compared to that by PSF. The results show that the micro properties of PSF have been changed greatly due to the addition of KMnO4, and there exists KMnO4 unattached in PSFN. A kind of tetrahedron structure somewhat like the connection of Si-O-Si bonds may be formed by the complexation of Mn （maybe in various valence） with PSE PSFN has lower turbidity removal than PSF at lower dose and achieves the same when the dose reaches a definite amount, while the removal of UV254 by PSFN is higher than that by PSF almost over entire dose range with the largest difference of about 17%. PSFN has more oxidization function at acidic condition than that at basic condition, and gives stronger ability of application for treating various waters than that by PSE.
