A Highly Efficient Polystyrene-Based Cationic Resin to Reduce Bacterial Contaminations in Water

Area of Science:

• Materials Science
• Environmental Science
• Microbiology

Background:

• Traditional water disinfection materials often suffer from poor durability and loss of antibacterial agents.
• Developing cost-effective and long-lasting water purification solutions is crucial for public health.

Purpose of the Study:

• To synthesize and characterize a novel polystyrene-based cationic resin (R4) with intrinsic antibacterial properties.
• To evaluate the efficacy of R4 in eliminating multidrug-resistant (MDR) bacterial pathogens from water.

Main Methods:

• R4 was synthesized via copolymerization of 4-ammonium-butyl-styrene (4-ABSTY) with N,N-dimethylacrylamide (DMAA) and cross-linked with N-(2-acryloylamino-ethyl)-acrylamide (AAEA).
• Physicochemical properties including morphology, hydrophilicity, porosity, and swelling were assessed.
• Time-kill experiments were conducted on MDR fecal pathogens (Enterococci, Salmonella, E. coli).
• Simulated water purification systems were used to test R4's bacterial killing efficiency over time.

Main Results:

• The synthesized R4 resin exhibited spherical morphology, micro-dimensioned particles, high hydrophilicity, porosity, and excellent swelling capabilities.
• R4 demonstrated rapid bactericidal effects against Enterococci and Salmonella, and achieved a 99.8% reduction in E. coli viable cells within 4 hours.
• In a simulated water purification column, R4 achieved a 99% bacterial killing efficiency after 4 hours of contact time.
• The material showed good reusability, returning to its original structure after drying.

Conclusions:

• R4 is a promising, intrinsically antibacterial material for water disinfection due to its robust physicochemical properties and high killing efficiency.
• The cost-effectiveness, scalability, and durability of R4 make it a viable candidate for developing advanced water purification systems.
• This novel resin effectively reduces bacterial contamination, including polymicrobial waterborne pathogens, offering a sustainable solution for safe water access.