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课件
Effect of pH and m来自百度文库chanism of adsorption
Fig.1 Effect of pH on the adsorption capacities of Cu(II), Zn(II), Cd(II) and Pb(II) complexes with IDS and EDDS on CS
electrostatic interactions
chemical interactions
Adsorption characteristics of chitosan modified by chelating agents of a new generation
GLA tends to cross-link CS bonding through the amino groups and EPI through the hydroxyl groups. the polymer hydrophobic character changes and diffusion of metal ions into the net becomes slower and therefore different for GLA and EPI.
• 另一方面，羧酸类物质的其他基团也可以作为金属离子的配体，从而影响重 金属的吸附。
Dorota Kołodynska Chemical Engineering Journal 179 (2012) 33–43
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
课件
课件
binding sites were not available
课件
the potential sorption mechanism：
课件
On the other hand, the ‘steric’ effect makes it difficult for Cu(II)–EDDS complexes to approach amino groups.
• 壳聚糖的吸附性能与它的高疏水性能有关（羟基、氨基、羧甲基），高密度的氨基和 羧甲基使壳聚糖能与带负电的物质发生反应. 改变pH能调节壳聚糖的质子化和去质子化 能力。
• pH 由1 到 6，是壳聚糖的氨基质子化的过程，随着pH增大，质子化程度从100% 降到 76% 。pH 高于8 ，壳聚糖完全去质子化，不能吸附重金属离子。
文献报告
报告人： 报告时间：
课件
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• 1、Removal of Cu(II), Zn(II), Cd(II) and Pb(II) complexes with IDS (iminodisuccinic acid亚氨基二琥珀酸) and EDDS (ethylene diaminedisuccinic acid 乙二胺二琥珀酸) from the synthetic aqueous solutions through adsorption on chitosan (CS)
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• 这两种配体（亚氨基二琥珀酸和乙二胺二琥珀酸）属于两种新的氨基多羧基型氨羧络合物，与 传统的EDTA相比较，有高的生物可降解性能。
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• 在不同配体纯在下，用壳聚糖吸附重金属的研究很少，原因是溶液中的配体 会阻碍重金属的回收。
• 羧酸类物质不仅可以作为重金属离子的配体，而且还可以与壳聚糖的氨基相 互作用形成酰胺键。羧酸的COO−与壳聚糖的氨基之间还有静电作用。与氨基 相比，酰胺键与对金属的绑缚能力比较弱。
Dorota Kołodynska Chemical Engineering Journal 179 (2012) 33–43
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• contact time (1–120 min), pH values (1–12), temperatures (20–50 ◦C) has been investigated.
• 3、The effect of CS modification by preparing the bead crosslinked by glutaraldehyde and epichlorhydrin was also tested.
• 亮点: • 假设：IDS and EDDS, are connected with metal ions in the form of the
complexes like [M(ids)]2− and [M(edds)]2−, where M(II) is Cu(II), Zn(II), Cd(II) and Pb(II) was made. • the application of CS for heavy metal anionic complexes removal from synthetic aqueous solution was studied.
enlarge the space ，improving the accessibility of amino groups, which is very important for M(II) ions sorption. The imine bond in the GLA-cross-linked CS is also capable of adsorbing M(II) ions.
Effect of pH and m来自百度文库chanism of adsorption
Fig.1 Effect of pH on the adsorption capacities of Cu(II), Zn(II), Cd(II) and Pb(II) complexes with IDS and EDDS on CS
electrostatic interactions
chemical interactions
Adsorption characteristics of chitosan modified by chelating agents of a new generation
GLA tends to cross-link CS bonding through the amino groups and EPI through the hydroxyl groups. the polymer hydrophobic character changes and diffusion of metal ions into the net becomes slower and therefore different for GLA and EPI.
• 另一方面，羧酸类物质的其他基团也可以作为金属离子的配体，从而影响重 金属的吸附。
Dorota Kołodynska Chemical Engineering Journal 179 (2012) 33–43
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
课件
课件
binding sites were not available
课件
the potential sorption mechanism：
课件
On the other hand, the ‘steric’ effect makes it difficult for Cu(II)–EDDS complexes to approach amino groups.
• 壳聚糖的吸附性能与它的高疏水性能有关（羟基、氨基、羧甲基），高密度的氨基和 羧甲基使壳聚糖能与带负电的物质发生反应. 改变pH能调节壳聚糖的质子化和去质子化 能力。
• pH 由1 到 6，是壳聚糖的氨基质子化的过程，随着pH增大，质子化程度从100% 降到 76% 。pH 高于8 ，壳聚糖完全去质子化，不能吸附重金属离子。
文献报告
报告人： 报告时间：
课件
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• 1、Removal of Cu(II), Zn(II), Cd(II) and Pb(II) complexes with IDS (iminodisuccinic acid亚氨基二琥珀酸) and EDDS (ethylene diaminedisuccinic acid 乙二胺二琥珀酸) from the synthetic aqueous solutions through adsorption on chitosan (CS)
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• 这两种配体（亚氨基二琥珀酸和乙二胺二琥珀酸）属于两种新的氨基多羧基型氨羧络合物，与 传统的EDTA相比较，有高的生物可降解性能。
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• 在不同配体纯在下，用壳聚糖吸附重金属的研究很少，原因是溶液中的配体 会阻碍重金属的回收。
• 羧酸类物质不仅可以作为重金属离子的配体，而且还可以与壳聚糖的氨基相 互作用形成酰胺键。羧酸的COO−与壳聚糖的氨基之间还有静电作用。与氨基 相比，酰胺键与对金属的绑缚能力比较弱。
Dorota Kołodynska Chemical Engineering Journal 179 (2012) 33–43
课件
Adsorption characteristics of chitosan modified by chelating agents of a new generation
• contact time (1–120 min), pH values (1–12), temperatures (20–50 ◦C) has been investigated.
• 3、The effect of CS modification by preparing the bead crosslinked by glutaraldehyde and epichlorhydrin was also tested.
• 亮点: • 假设：IDS and EDDS, are connected with metal ions in the form of the
complexes like [M(ids)]2− and [M(edds)]2−, where M(II) is Cu(II), Zn(II), Cd(II) and Pb(II) was made. • the application of CS for heavy metal anionic complexes removal from synthetic aqueous solution was studied.
enlarge the space ，improving the accessibility of amino groups, which is very important for M(II) ions sorption. The imine bond in the GLA-cross-linked CS is also capable of adsorbing M(II) ions.