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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and Coordination Behavior of Cellulose Beads Derivative Modified by 1,5-Diaminoethyl-3-Hydroxy-1,5-Diazacycloheptane
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Preparation and Coordination Behavior of Cellulose Beads Derivative Modified by 1,5-Diaminoethyl-3-Hydroxy-1,5-Diazacycloheptane

机译：1,5-二氨基乙基-3-羟基-1,5-二氮杂环庚烷修饰的纤维素微珠衍生物的制备和配位行为

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摘要

Cellulose derivative (MPCN) modified by 1,5-diaminoethyl-3-hydroxy-1,5-diazacycloheptane (DAND) was prepared and characterized by scanning electron microscopy and elemental, and infrared analysis. MPCN and its Cu~(2+),Pb~(2+) complexes were characterized by thermogravimetric and differential thermal analysis. The coor dination adsorption behavior of MPCN with divalent copper and lead ions was determined. The effects of tempreture, initial pH value, and the concentration of MPCN ligand to the equilibrium adsorption were discussed. The optimum pH range of the coordination adsorption of MPCN with Cu~(2+) and Pb~(2+) is 5-6. The rate constants of the coordination reaction were found. At 323 K, the rate constant is 10 * 10~3 and 7.0 * 10~4 s~9-1) for Cu~(2+) and Pb~(2+), respectively. The thermodynamci parameters of the coordination reaction were obtained based on the experiment data of the adsorption isotherms. The coordination reaction was performed spontaneously from the data of #DELTA#G, as follows: -21.65 and -19.41 kJ/mol and #DELTA#S, 87.06 and 67.92 kJ/mol K for Cu~(2+) and Pb~(2+), respectivley. The coordination ratio of DADN coordination group immobilized on cellulose beads with either metal ion is about 1 : 2 from the of the relation of lgD versus lgL and the capacity of saturation adsorption.
机译：制备了由1,5-二氨基乙基-3-羟基-1,5-二氮杂环庚烷（DAND）改性的纤维素衍生物（MPCN），并通过扫描电子显微镜，元素和红外分析对其进行了表征。通过热重分析和差热分析对MPCN及其Cu〜（2 +），Pb〜（2+）配合物进行了表征。测定了MPCN与二价铜和铅离子的配位吸附行为。讨论了温度，初始pH值和MPCN配体浓度对平衡吸附的影响。 MPCN与Cu〜（2+）和Pb〜（2+）配位吸附的最佳pH范围为5-6。发现了配位反应的速率常数。在323 K下，Cu〜（2+）和Pb〜（2+）的速率常数分别为10 * 10〜3和7.0 * 10〜4 s〜9-1。根据吸附等温线的实验数据，获得了配位反应的热力学参数。根据＃DELTA＃G的数据自发进行配位反应，如下所示：Cu〜（2+）和Pb〜（-21.65和-19.41 kJ / mol和＃DELTA＃S，87.06和67.92 kJ / mol K 2+），尊敬。从lgD与lgL的关系和饱和吸附能力的关系出发，用任何一种金属离子固定在纤维素珠上的DADN配位基团的配位比约为1：2。

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