Disinfection effect of hydrotalcite compounds containing antimicrobial metals against microorganisms in water

摘要

Hydrotalcites containing copper (Cu-HT) were synthesized using MgCl_2, AlCl_3 and CuCl_2, and hydrotalcites containing zinc (Zn-HT) were synthesized using MgCl_2, AlCl_3 and ZnCl_2. Their disinfection activities against Escherichia coli, Staphylococcus aureus and E. coli phage Q #beta# (phage Q #beta#) were investigated by the shake-flask method. Cu-HT possessed strong disinfection activities against E. coli and phage Q #beta#, whereas Zn-HT showed bactericidal activity against E. coli, S. aureus and phage Q #beta#. Copper elution from Cu-HT was undetectable during the disinfection test. The disinfection activity of Cu-HT was due to the presence of copper. The pH of Cu-HT suspensions was pH 9.3 as a result of the hydration reaction at the surfacesof the Cu-HT particles. The remarkable disinfection activity of Cu-HT against phage Q #beta# seemed to be based on the cooperative action of copper in Cu-HT and the direct contact of phage Q #beta# cells to the hydroxyl layers on the surfaces of the Cu-HT particles. We propose that Cu-HT can be used as an alternative disinfectant to chlorine in a water purification system.