A novel Ag/ZnO core–shell structure for efficient sterilization synergizing antibiotics and subsequently removing residuals

Abstract

The massive use of antibiotics has led to the aggravation of bacterial resistance and also brought environmental pollution problems. This poses a great threat to human health. If the dosage of antibiotics is reduced by increasing its bactericidal performance, the emergence of drug resistance is certainly delayed, so that there's not enough time for developing drug resistance during treatment. Therefore, we selected typical representative materials of metal Ag and semiconductor ZnO nano-bactericides to design and synthesize Ag/ZnO hollow core–shell structures (AZ for short). Antibiotics are grafted on the surface of AZ through rational modification to form a composite sterilization system. The research results show that the antibacterial efficiency of the composite system is significantly increased, from the sum (34.7% + 22.8% = 57.5%) of the antibacterial efficiency of AZ and gentamicin to 80.2%, net synergizes 22.7%, which fully reflects the effect of 1 + 1 > 2. Therefore, the dosage of antibiotics can be drastically reduced in this way, which makes both the possibility of bacterial resistance and medical expenses remarkably decrease. Subsequently, residual antibiotics can be degraded under simple illumination using AZ-self as a photocatalyst, which cuts off the path of environmental pollution. In short, such an innovative route has guiding significance for drug resistance.

Keywords

• Ag/ZnO hollow Core–shell structures
• Antibiotics
• Gentamycin
• Synergistic sterilization
• Photodegradation