Method for cleaning and activating boron-doped diamond film electrodes on-line

Abstract

The invention provides a method for the on-line cleaning and activation of a boron-doped diamond thin-film electrode. The method comprises the steps of injecting a sulfuric acid buffer solution into a water sample analysis chamber, wherein the concentration of the sulfuric acid buffer solution is 0.05M to 0.5M; adjusting the operating voltage of the boron-doped diamond thin-film electrode to keep the operating voltage of the boron-doped diamond thin-film electrode at a constant voltage of +2.5V to +5V, and maintaining the voltage for 90 seconds to 360 seconds; adjusting the operating voltage of the boron-doped diamond thin-film electrode, and continuously and circularly scanning the voltage of the boron-doped diamond thin-film electrode at a speed of -50mv / s within the range of +2.5 to +5V and -1V to -3V; adjusting the operating voltage of the boron-doped diamond thin-film electrode to keep the voltage of the boron-doped diamond thin-film electrode at a constant voltage of -1V to -3V, and maintaining the voltage for 90 seconds to 240 seconds. The above method is conducted based on a built-in three-electrode system. According to the method, the voltage is applied to the boron-doped diamond thin-film electrode as a working electrode. In this way, intermediate products and phenolic organic substances, which are absorbed onto the surface of the electrode, can be removed without the physical grinding operation, and the electrode can be activated at the same time. Therefore, the repeatability and the sensitivity of the electrode are maintained.

Description

technical field [0001] The invention relates to a method for removing the surface pollution of the boron-doped diamond thin-film electrode and activating the electrode in the process of electrochemically analyzing phenolic organic substances in water by using the boron-doped diamond thin-film electrode. It can effectively remove the organic matter adsorption and the pollution of intermediate products generated during the use of the electrode, maintain the repeatability of the boron-doped diamond thin film electrode in the electrochemical analysis of phenolic organic substances, and can effectively activate the electrode and maintain the sensitivity of the electrode. Background technique [0002] Phenols are widely used in many fields such as industrial production, medicine, and health. In the process of industrial and agricultural production and life, some phenolic organic substances will enter the water body. The phenolic pollutants in the water body are not easily degraded ...

AI Technical Summary

Problems solved by technology

However, this kind of operation requires the electrode to be removed from the electrochemical analysis test platform, and then necessary grinding and cleaning work, the operation process is relatively cumbersome

Unable to meet the requirements of long-term real-time online detection of phenolic organic compounds

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