Abstract
Environmental contamination can cause serious problems in water cycling systems. In this study, mesoporous composite-supported N-halamines (MCSNs) were synthesized and characterized, where the surface area retention rate of the MCSNs was over 70 % higher than MCM-41. The reaction between organic N-halamines and formaldehyde was examined in aqueous phase. The monomeric N-halamines (MCDMH) rapidly reacted with formaldehyde (10 ppm, 10 mL), and finished completely within 10 min. The MCSNs only reacted with formaldehyde in the high molar ratio (Cl+ to formaldehyde, 40:1) and alkaline conditions (pH higher than 10), and approximately 60 % of formaldehyde can be degraded within 10 min. The reaction kinetics were studied and the kinetic parameters were investigated. The MCSNs were highly effective against S. aureus (7.94 logs) and E. coli O157:H7 (8.0 logs) with 1 min of contact time, demonstrating impressive antibacterial properties in aqueous conditions. As a type of antibacterial material, MCSNs introduce a new direction for the application of N-halamine-based materials in formaldehyde decontamination, indicating their potential to be utilized as novel water treatment materials.
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