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1、文献报告,报告人: 报告时间:,1,优选课资,2,优选课资,Adsorption characteristics of chitosan modied 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 t
2、hrough adsorption on chitosan (CS) contact time (1120 min), pH values (112), temperatures (2050 C) has been investigated. 3、The effect of CS modication by preparing the bead crosslinked by glutaraldehyde and epichlorhydrin was also tested.,3,优选课资,Adsorption characteristics of chitosan modied by chel
3、ating 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。,4,优选课资,Adsorption characteristics of chitosan modied 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
4、基相比,酰胺键与对金属的绑缚能力比较弱。 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 Koodynska Chemical Engineering Journal 179 (2012) 3343,5,优选课资,Adsorption characteristics of chitosan modied by chelating agents of a new generation,亮点: 假设:IDS and EDDS, are connected with metal ions in the form of the complexes like
5、 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.,Dorota Koodynska Chemical Engineering Journal 179 (2012) 3343,6,优选课资,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
6、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。,Adsorption characteristics of chitosan modied by chelating agents of a new generation,7,优选课资,Fig.1,Effect of pH on the adsorption capacities of Cu(II), Zn(II), Cd(II) and Pb(II) co
7、mplexes with IDS and EDDS on CS,Effect of pH and mechanism of adsorption,8,优选课资,9,优选课资,binding sites were not available,10,优选课资,the potential sorption mechanism:,electrostatic interactions,chemical interactions,On the other hand, the steric effect makes it difcult for Cu(II)EDDS complexes to approac
8、h amino groups.,11,优选课资,Adsorption characteristics of chitosan modied by chelating agents of a new generation,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)
9、ions.,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.,12,优选课资,It can be due to the fact that in the presence of
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