Chlorine dioxide disinfectant is widely used in solution form because of its high efficiency

broad-spectrum sterilization ability and environmental friendliness.To address the problem that the application of gaseous chlorine dioxide in water disinfection is relatively small

a high-quality and inexpensive slow-release chlorine dioxide bactericide card was prepared with modified zeolite as the carrier

sodium chlorite as the chlorine dioxide precursor

and cupric nitrate and ferric nitrate as the catalyst.Taking full advantage of the strong permeability and penetration of gaseous chlorine dioxide

it relies on the reaction of water vapor and carbon dioxide in the air with sodium chlorite to achieve stable release of chlorine dioxide.The effects of zeolite modification process

zeolite species

zeolite particle size

the concentration of sodium chlorite and catalyst on chlorine dioxide release rate were further explored.The optimum particle size is 1-2 mm

the optimum calcination temperature is 500℃

and the optimum solution for soaking zeolite is 18% sodium chlorite solution.Adding 0.003 mol/L mixed catalyst of cupric nitrate and ferric nitrate into sodium chlorite soaking solution can improve the release rate of chlorine dioxide.The prepared bactericide card is valid at least for 40 days.