Synthesis and characterization of a phosphotungstic acid composite carrier and its application in solid chlorine...

Chlorine dioxide (ClO₂) is an antimicrobial compound used in water. The short release time of existing solid chlorine dioxide disinfectants significantly inhibits their bactericidal efficiency. We propose a novel approach in which attapulgite was introduced into phosphotungstic acid and SBA-15 to achieve the slow-release of chlorine dioxide disinfectant tablets. The emphasis of the study lies in slow release of chlorine dioxide and reducing the escape of chlorine dioxide gas to increase the reaction time and improve disinfection efficiency. When dissolved in water the decrease rate of chlorine dioxide within 15 days after mixing SBA-15/HPW with sodium chlorite is 78.6%. Moreover, the sterilization efficiency of Escherichia coli reaches 100% within 5 minutes, and the killing rate of Staphylococcus aureus exceeds 99.999% within 10 minutes. The research solved the storage and transportation problems of ClO₂ and resulted in a solution for the disinfection of water requiring long-term disinfection.