Photoassisted electrically controlled ion exchange process and method for treating negative ions in low-concentration wastewater

Abstract

The invention discloses a photoassisted electrically controlled ion exchange process and a method for treating negative ions in low-concentration wastewater. The method is coupled with electrically controlled ion exchange and a photocatalytic mechanism. During adsorption, waste liquid is injected into an electrolytic cell; a quartz light window is opened to irradiate a photoelectric functional film material electrode with light, and a circuit is turned on to apply an oxidation potential to the electrode, thereby realizing the adsorption of a target negative ion in the waste liquid; meanwhile,a hydrogen evolution reaction occurs at a counter electrode; after the film electrode is saturated in adsorption, a power supply is cut off to discharge treatment liquid; during desorption, a corresponding saline solution is injected, and the quartz light window is closed; an external circuit is turned on to apply a reduction potential to the electrode to realize desorption of the negative ions; meanwhile, an oxygen evolution reaction occurs at the counter electrode. The photoassisted electrically controlled ion exchange process realizes efficient utilization of light energy and electric energy; the photoassisted electrically controlled ion exchange technology has the characteristics that desired devices are simple, the process operation is stable, and the technology is energy-saving, highin treatment efficiency and the like when being applied to treating the negative ions in the low-concentration wastewater.

Description

technical field [0001] The invention relates to a light-assisted and electronically controlled ion exchange process, in particular to a method for efficiently combining light energy and electric energy, energy-saving and efficient treatment of anions in low-concentration waste water, and belongs to the field of waste water treatment. Background technique [0002] With the continuous development of my country's economy and industry, the amount of anionic wastewater is increasing, and the pressure on the environment and the harm to the human body are also increasing. At present, the main methods for treating anion-containing wastewater in industry include membrane separation, adsorption, ion exchange, oxidation / reduction and biological treatment. These traditional methods for treating ionic wastewater often have defects in actual operation, mainly reflected in complex operation, high energy consumption and operating cost, chemical reaction and ion separation matrix regeneratio...

AI Technical Summary

Problems solved by technology

Although the above photocatalytic water treatment technology has the advantages of strong oxidation ability, mild reaction conditions, direct conversion of pollutant ions, and avoiding secondary pollution, a problem still exists in the current photocatalytic water treatment technology is the separation of photogenerated electrons and holes. The recombination rate is higher, which leads to lower photocatalytic degradation efficiency and output power

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