Measurement of Complexation Stability Constant and Coordinating Number of Poly(ethylenimine) with Metals

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	Measurement of Complexation Stability Constant and Coordinating Number of Poly(ethylenimine) with Metals
	Huang Jia-Hua ; Gong Zhen-Bin ; Lin Ji-Jun ; Duan Hua-Ling ; Gong ZB(弓振斌)
刊名	http://dx.doi.org/10.7503/cjcu20120405
	2012-12-10
关键词	WATER-SOLUBLE POLYMERS WEIGHT POLY(ACRYLIC ACIDS) BINDING CONSTANTS AQUEOUS-SOLUTIONS POLYACRYLIC-ACID ULTRAFILTRATION IONS REMOVAL NI(II) SEPARATION
英文摘要	A rapid and accurate method using polymer complexation ultra-filtration (PC-UF) technique and inductively coupled plasma mass spectrometry(ICP-MS) for the measurement of the complexation stability constant and the average coordination number of poly (ethylenimine) (PET) groups participating in the complex formation of PEI with metal ions was proposed. The method was applied to determine the stability constant and the average coordination number of PEI and Cd2+ complex. Firstly the mixture of various initial concentration ratios of PEI and Cd2+ solution were prepared, respectively, then the mixture reacted until the complexation equilibrium reached, and at last Cd2+ and small components were permeated into the solution and PEI-Cd complex was hold back with centrifugal ultra-filtration kit. Then ultra-filtration followed was completed so as to decompose PEI-Cd complex and obtain Cd2+ species using 10 mL 3% (volume fraction) HNO3. With the help of chemical model inferred in the study, the complexation stability constant and the average coordinating number of PEI-Cd could. be calculated. Effect of pH value(pH = 4. 0-5. 9) on the equilibrium was investigated. The results showed that the complexation stability constant and the average coordinating number of PEI-Cd became larger as pH value increases. This may due to the protonation of PEI reduces as pH values increase, then the binding ability of PEI with metals become stronger.
语种	英语
出版者	CHEM J CHINESE U
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/87848]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Huang Jia-Hua,Gong Zhen-Bin,Lin Ji-Jun,et al. Measurement of Complexation Stability Constant and Coordinating Number of Poly(ethylenimine) with Metals[J]. http://dx.doi.org/10.7503/cjcu20120405,2012.
APA	Huang Jia-Hua,Gong Zhen-Bin,Lin Ji-Jun,Duan Hua-Ling,&弓振斌.(2012).Measurement of Complexation Stability Constant and Coordinating Number of Poly(ethylenimine) with Metals.http://dx.doi.org/10.7503/cjcu20120405.
MLA	Huang Jia-Hua,et al."Measurement of Complexation Stability Constant and Coordinating Number of Poly(ethylenimine) with Metals".http://dx.doi.org/10.7503/cjcu20120405 (2012).