Ion selective multi-modified composite electrode material, preparation method and application of composite electrode material in electro-adsorption desalination

Abstract

The nvention discloses an ion selective multi-modified composite electrode material, a preparation method and application of the composite electrode material in electro-adsorption desalination. According to the electrode material as well as a preparation method and application thereof, an electro-adsorption desalination module with the composite electrode material serving as electrodes is used fortreating salt-contained wastewater mainly contains landfill leachate effluent, and the desalting rate is 42.6%, the desalting speed is 90 mg / (L*h), wherein the removal rate of Cl<-> is 66.7%, the removal rate of Ca<2+> is 80.2%, and the removal rate of Mg<2+> is 73.3%; and internal diffusion equation adsorption kinetics fitting is carried out on different ion adsorption processes, the adsorptionconstant of the Cl<-> is 2.78, and after adsorption kinetics fitting, the adsorption constant of the Ca<2+> and the Mg<2+> is 2.06 times or more of the adsorption constant of the Cl<->. The electrodematerial prepared through the preparation method has the advantages of being large in adsorption capacity, strong in conductivity and capable of realizing selective adsorption of cations, especially the Ca<2+> and the Mg<2+>, the electro-adsorption desalination module with the composite electrode material serving as the electrodes can be used for processing the salt-contained industrial wastewaterwith high hardness and complex components in a targeted mode, so that the salt-contained wastewater is effectively desalinated, industrial regeneration and reuse are carried out, and a wide prospectin the field of environmental protection and salt-contained wastewater treatment is achieved.

Description

technical field [0001] The present invention mainly relates to the material selection and preparation method of a plate electrode and its application in the field of electroadsorption desalination, especially the electrode material formed by compounding felts and metals with selective adsorption for anions and cations after multiple modification by different methods , preparation method and application thereof. It belongs to the field of environmental protection saline waste water treatment. Background technique [0002] Industrial wastewater usually has the characteristics of complex composition, high salt, high ammonia nitrogen, etc., especially the industrial saline wastewater mainly composed of landfill leachate, which usually contains a large amount of Ca 2+ , Mg 2+ and other cations, so that its hardness and other indicators cannot meet the requirements of industrial wastewater recycling. The electro-adsorption desalination technology developed in recent years has t...

AI Technical Summary

Problems solved by technology

At present, the electrode materials commonly used in engineering applications mainly include carbon electrodes and modified electrodes, etc., but most of the electrode materials are single, or only simple mechanical composites are performed, such as the roll-type carbon fiber desalination device described in the Chinese patent CN107459116A written by Liu Xiaomin and others. The carbon fiber electrode and the titanium alloy electrode are mechanically combined, and the adsorption capacity and conductivity are not significantly improved; the metal fiber electrode described in the Chinese patent CN107758810A written by Chu Xingquan et al. solves the problems of poor hydrophilicity and short electrode life that may be caused by mechanical compounding. problem, but there is no selectivity for ions, and it is difficult to carry out targeted desalination treatment for certain types of industrial wastewater with high ion concentration