Study on the stability of antibacterial silver-carried zirconium phosphate

ABSTRACT

The stability of antibacterial silver-carried zirconium phosphate (AgZrP) was investigated using thermoanalysis (TG/DSC), X-ray diffraction (XRD), UV light irradiation and water soaking methods.

The weight loss of AgZrP was nomore than 5.0mass%at the heat treating temperature of 1100℃, and the onset temperature of decomposition for the crystal structure of AgZrP appeared 1096.9℃.

The whiteness of the sample treated at 900℃(4^# sample)was 86.4%after exposed to UV light for 24h, and its MIC against E.coli and S.aureus was 100 mg.l-1 and 150 mg.1^-1 respectively.

Moreover, the percentage of release Ag⁺ in 4^# sample was only 6.1 mass% and the MIC against E.coli and S.aureus still remained 220mg.1^-1 and 280mg.1^-1 respectively after soaking in water for 10 days.

Therefore, AgZrP possessed excellent thermal stability, light permanency and water resistance.
 

RESULTSAND DISCUSSION

1. Thermal stability

 
This result suggested that AgZrPpossessed excellent thermal stability.
 

2. Light permanency

They still remained good light permanency and antibacterial activity after exposed toUV light for 24h.


3. Water resistance

This results indicated that 4# sample showed excellent water-resistance.