Imprinted adsorption of 4,4′-diaminodiphenyl ether under charge

Abstract

In order to improve the electrochemical synthesis efficiency and enhance the electromagnetic wave absorption properties of 4,4′-diaminodiphenyl ether molecularly imprinted polymer (4,4′-ODL-MIP) composite poly 4,4′-diaminodiphenyl ether (P-4,4′-ODL) (4,4′-ODL-MIP-P-4,4′-ODL), it is very important to investigate the mechanism of 4,4′-ODL imprinted adsorption by its MIP, which is involved to the process of the second electropolymerization of composite 4,4′-ODL-MIP-P-4,4′-ODL. The amount of charge carried by 4,4′-ODL-MIP-P-4,4′-ODL,closely relating to its electromagnetic wave absorption, can be conducted to be the amount of adsorption in this paper. At the temperature of 298 K, Langmuir, Brunauer-Emmett-Teller (BET), Freundlich, D-R,Temkin and Henry adsorption models were fitted by the charge of composite.The fitting data showed that the three isothermal adsorption models of Langmuir, Dubinin-Radushkevich and Henry were more suitable for simulating the imprinted adsorption of 4,4′-ODL-MIP on 4,4′-ODL in solution during the second electropolymerization. Meanwhile, the results of the four adsorption kinetic rate equations fitted by charge (quasi-first-order, quasi-second-order, Elovich and intragranular diffusion) exhibited that 4,4′-ODL-MIP adsorption 4,4′-ODL was followed the quasi-first-order, while its rate was controlled by the liquid film and intra-particle diffusion. Also, in the temperature range from 273.15 to 313.15 K, the thermaldynamic parameters estimated by charge of this imprinted adsorption showed that Δ<italic>H</italic> and Δ<italic>S</italic> were both larger than zero, while Δ<italic>G</italic> was less than zero. This indicated that the above spontaneously imprinted adsorption was an endothermic process, while its disorder increased at the same time. Therefore, this imprinted adsorption was advantage to perform the second electropolymerization fastly, to safeguard the good electromagnetic wave absorption properties of the composite.