Disinfection is an essential part of drinking water treatment. The sodium hypochlorite disinfection gains a bright development prospect because of its effectiveness and safety. Preparation of sodium hypochlorite in an undivided cell offers several advantages as high current efficiency

low power consumption

simple operation and easy accessibility of raw electrolytic material

but its reaction mechanism still needs to be discussed and its poor stability is the main limitation for its broader application. The effect of temperature

PH

electrolyte type

electrolyte concentration

etc. on the current efficiency in an undivided cell was studied and an optimized electrolysis condition was acquired. Also

the electrolysis reaction order of n=4.38 was determined by differential method

the reaction rate constant of electrolysis was calculated and the kinetic equation was established to further determine the electrolysis mechanism. According to the concentration change of the available chlorine in sodium hypochlorite solution through time

the kinetic features of available chlorine attenuation was modeled by pseudo first-order and pseudo second-order equations to further adjust and control its stability.