Method for preparing novel residual chlorine detecting electrode

Abstract

The preparation process of novel residual chlorine detecting electrode includes selecting glass-carbon electrode, gold electrode, platinum electrode or graphite electrode as base electrode, and platinum filament as counter electrode, and saturated calomel electrode or silver / silver chloride electrode as reference electrode; soaking surface pre-treated base electrode in 0.1 M concentration perchloric acid solution containing 1-5mM concentration aurochlorohydric acid at room temperature; and three-step step potential process to obtain stable nanometer gold particle modified electrode. The obtained nanometer gold particles of 50-150 nm diameter are arranged compactly and orderedly on the surface of the base electrode. The modified electrode has excellent catalytic performance on the electrochemical reduction reaction of residual chlorine and the electrochemical reduction reaction of chlorine dioxide and dissolved oxygen.

Description

technical field [0001] The invention relates to an electrode, in particular to a preparation method for modifying gold nanoparticles on the surface of a base electrode. Background technique [0002] The use of chlorine preparations (chloramine, chlorine gas, hypochlorite, etc.) to disinfect and sterilize drinking water and industrial cooling water is a recognized technology widely used at home and abroad. For drinking water, it is mainly to kill infectious bacteria to protect people's health; for cooling water, it is mainly to kill microorganisms to ensure the good working condition of the heat exchange system. Residual chlorine refers to the remaining total amount of chlorine (active chlorine, OCl - And organic chlorine, chlorine was positive). The sterilization and disinfection effectiveness of chlorine preparations depends only on the residual chlorine concentration. In order to strictly monitor the water quality, the urban sanitation and epidemic prevention department...

AI Technical Summary

Problems solved by technology

[0003] The traditional methods for residual chlorine determination include: titration (such as arsenous acid titration, etc.), spectrophotometry (such as DPD spectrophotometry, etc.), they are all laboratory methods, good accuracy but time-consuming and laborious, not suitable for timely online detection

The detection of residual chlorine test paper has the characteristics of easy operation and timely online, but the accuracy is poor