氨基乙醇席夫碱Cu^(2+)配合物的合成及其催化染料降解

Cu^(2+) Complexes with 2-aminoethanol Schiff base: synthesis and catalytic performance for degradation of dyes degradation

合成了3个氨基乙醇席夫碱Cu2+配合物并进行了表征.利用分光光度法考查了配合物催化降解酸性蓝9的性能和动力学曲线;利用Graph Pad Prism 5软件进行了米氏常数的测定;利用HPLC法测定了降解产物.发现配合物均为单核五配位配合物.发现配合物能催化废水中酸性蓝9降解,催化活性Cu Cl Lb·H2O最好,Cu Cl La·H2O其次,Cu Cl Lc·H2O最差,说明给电子基团有利于催化活性,位阻基团不利于催化活性.发现Cu Cl La·H2O、Cu Cl Lb·H2O催化酸性蓝9的V-S曲线与米氏方程吻合,米氏常数分别为1.35×10-2mmol·L-1和1.54×10-2mmol·L-1,说明催化过程具有酶促特性,Cu Cl La·H2O与底物的结合能力比Cu Cl Lb·H2O与底物结合能力弱.发现降解产物有顺式丁烯二酸.推测了配合物的催化机理和酸性蓝9的降解机制.得到了两个性能优良的酸性蓝9降解的仿酶催化剂,催化活性可以通过基团进行调控,为开发新的染料废水的有效治理技术提供了理论和实践支持.

Three Cu2＋complexes with 2-aminoethanol Schiff base were prepared and characterized,and their catalytic properties for degradation of the acidic blue 9 were investigated by visible absorption spectra method. The Michaelis-Menten constant and the catalytic products were respectively determined by the software Graph Pad Prism 5 and HPLC. It was found that the complexes were mononuclear with five coordinations to a center Cu atom,and the catalytic activity of these three complexes followed the order： Cu Cl L^b·H2O Cu Cl L^a·H2O Cu Cl L^c·H2O,indicating that the electron donating group was good for the catalytisis and the steric hindrance was an unfavorable factor. The experimental V-S curve was fitted well with MichaelisMenten equation,suggesting the catalytic properties of Cu Cl L^a·H2O and Cu Cl L^b·H2O were similar with the enzymatic properties. the Kmwere 1.35×10^-2and 1. 54 × 10^-2mmol·L^-1,respectively,implying that the binding ability of Cu Cl L^b·H2O was stronger than that of Cu Cl L^a·H2O. The main products of degradation were maleic acid and the catalytic mechanism of complexes was deduced. Moreover,these complexes exhibited a superior catalytic applicability for the degradation of various substituents on the benzene ring,which provides theoretical and experimental supports for a new technology for dye removal.