Complexes of chitosan with Mn(Ⅱ) were prepared by adding Mn(OAc)2·4H2O to Chitosan solution. IR, elemental analysis and TG analysis were used to character the complex. The results showed that there were coordina...Complexes of chitosan with Mn(Ⅱ) were prepared by adding Mn(OAc)2·4H2O to Chitosan solution. IR, elemental analysis and TG analysis were used to character the complex. The results showed that there were coordinate bands formed. H2O2 was used to degrade chitosan-Mn(Ⅱ) complex, and the molecular distribution of degraded products were investigated after eliminating Mn(Ⅱ) ions using the cation exchange resin column. The result suggested that the Chitosan could be degraded rapidly, the degradation started from higher molecular weight range, the molecular weight distribution of oligosaccharides was much more narrower than that of degradated products from common methods such as hydrolysis, acidic and oxidizing methods. The index of molecular weight distribution was changed with the average degradability. When exceeding 10 oligosaccharides, the smaller of the DP, the smaller of the index.展开更多
The compound reacts with 2-(Methylthio)thiophene (C5H6S2) while refluxing in xylene to afford a methylthio-tetramanganese product 4, in which C5H6S2 is cleaved with loss of thiophene. The crystal structure of 4 has be...The compound reacts with 2-(Methylthio)thiophene (C5H6S2) while refluxing in xylene to afford a methylthio-tetramanganese product 4, in which C5H6S2 is cleaved with loss of thiophene. The crystal structure of 4 has been studied by direct method. Based on the 21 685 unique reflections collected using MoKα of X-ray radiation and a CCD-based detector, it is refined to an agreement index (R1) of 0.079 0. The cell is triclinic with dimensions: a=1.719 49 nm, b=1.959 2 nm, c=2.632 6 nm and α=79.733°, β=71.407°, γ=89.387°. There are 12 unit cells of 4 in the cell, with space group P1.展开更多
目的 研究聚硅硫酸铝 ( PASS)在水处理中的性能 .方法 就原水温度、浊度、 p H值对自制的絮凝剂 PASS絮凝性能的影响及处理前后原水 p H值改变量进行烧杯搅拌实验 .结果 聚硅硫酸铝具有适应的水温及 p H值范围宽 ,处理前后 p H值变...目的 研究聚硅硫酸铝 ( PASS)在水处理中的性能 .方法 就原水温度、浊度、 p H值对自制的絮凝剂 PASS絮凝性能的影响及处理前后原水 p H值改变量进行烧杯搅拌实验 .结果 聚硅硫酸铝具有适应的水温及 p H值范围宽 ,处理前后 p H值变化小等优越性 .展开更多
文摘Complexes of chitosan with Mn(Ⅱ) were prepared by adding Mn(OAc)2·4H2O to Chitosan solution. IR, elemental analysis and TG analysis were used to character the complex. The results showed that there were coordinate bands formed. H2O2 was used to degrade chitosan-Mn(Ⅱ) complex, and the molecular distribution of degraded products were investigated after eliminating Mn(Ⅱ) ions using the cation exchange resin column. The result suggested that the Chitosan could be degraded rapidly, the degradation started from higher molecular weight range, the molecular weight distribution of oligosaccharides was much more narrower than that of degradated products from common methods such as hydrolysis, acidic and oxidizing methods. The index of molecular weight distribution was changed with the average degradability. When exceeding 10 oligosaccharides, the smaller of the DP, the smaller of the index.
文摘The compound reacts with 2-(Methylthio)thiophene (C5H6S2) while refluxing in xylene to afford a methylthio-tetramanganese product 4, in which C5H6S2 is cleaved with loss of thiophene. The crystal structure of 4 has been studied by direct method. Based on the 21 685 unique reflections collected using MoKα of X-ray radiation and a CCD-based detector, it is refined to an agreement index (R1) of 0.079 0. The cell is triclinic with dimensions: a=1.719 49 nm, b=1.959 2 nm, c=2.632 6 nm and α=79.733°, β=71.407°, γ=89.387°. There are 12 unit cells of 4 in the cell, with space group P1.
