In this study,the effects of low temperature on aluminum(Ⅲ)(Al)hydrolysis were examined both theoretically and experimentally by constructing a solubility diagram for amorphous aluminum hydroxide(Al(OH)_3(am))and a d...In this study,the effects of low temperature on aluminum(Ⅲ)(Al)hydrolysis were examined both theoretically and experimentally by constructing a solubility diagram for amorphous aluminum hydroxide(Al(OH)_3(am))and a distribution diagram of hydrolyzed Al species.First,thermodynamic data of Al species at 4℃were calculated from that at 25℃.A well confirmed polymeric Al species, AlO_4Al_(12)(OH)_(24)^(7+)(Al_(13)),was involved in building the diagrams and,correspondingly,the non-linear simultaneous equations wit...展开更多
A polyaluminum chloride (PAC) sample was prepared using a slow alkaline titration method. The Bio-Gel P-100 gel column chromatographic technique was used to separate and char- acterize the various forms of aluminum pr...A polyaluminum chloride (PAC) sample was prepared using a slow alkaline titration method. The Bio-Gel P-100 gel column chromatographic technique was used to separate and char- acterize the various forms of aluminum present in the prepared PAC solution. The effluents from a gel column were monitored using online chemical method: Al-Ferron timed complexation spectropho- tometry and by 27Al nuclear magnetic resonance (NMR) spectroscopy. Effects of different experi- mental conditions such as eluent flow rate, ionic strength and pH on separation of Al13 were investi- gated. Experimental results indicated that molecule size exclusion was not the only parameter af- fecting the column chromatographic separation efficiency of Al13 but molecule charge as well. Re- ducing the eluent flow rate, increasing the ionic strength and suitable pH resulted in increase in the separation efficiency. Experimental results clearly indicated that by varying the experimental condi- tions, it is possible to produce pure Al13 species using a gel column chromatographic technique.展开更多
文摘In this study,the effects of low temperature on aluminum(Ⅲ)(Al)hydrolysis were examined both theoretically and experimentally by constructing a solubility diagram for amorphous aluminum hydroxide(Al(OH)_3(am))and a distribution diagram of hydrolyzed Al species.First,thermodynamic data of Al species at 4℃were calculated from that at 25℃.A well confirmed polymeric Al species, AlO_4Al_(12)(OH)_(24)^(7+)(Al_(13)),was involved in building the diagrams and,correspondingly,the non-linear simultaneous equations wit...
基金supported by Jiangsu Key Laboratory Metallic Materials, China (No. BM2007204)the Fundamental Research Funds for the Central Universities, China (No. 2242016k40011)。
基金This work was supported by the subproject of '863' Project of China (Grant No. 2002AA601290-5) the Natural Science Foundation of Shandong Province(Grant No. Y2002B03).
文摘A polyaluminum chloride (PAC) sample was prepared using a slow alkaline titration method. The Bio-Gel P-100 gel column chromatographic technique was used to separate and char- acterize the various forms of aluminum present in the prepared PAC solution. The effluents from a gel column were monitored using online chemical method: Al-Ferron timed complexation spectropho- tometry and by 27Al nuclear magnetic resonance (NMR) spectroscopy. Effects of different experi- mental conditions such as eluent flow rate, ionic strength and pH on separation of Al13 were investi- gated. Experimental results indicated that molecule size exclusion was not the only parameter af- fecting the column chromatographic separation efficiency of Al13 but molecule charge as well. Re- ducing the eluent flow rate, increasing the ionic strength and suitable pH resulted in increase in the separation efficiency. Experimental results clearly indicated that by varying the experimental condi- tions, it is possible to produce pure Al13 species using a gel column chromatographic technique.
