Thermal Stability and Antibacterial Activity of Phosphonium Salts Pillared Layered α-Zirconium Phosphates

Dodecyl tributyl phosphonium bromide pillared layered α-zirconium phosphate(DDTB-ZrPs) was prepared by introducing dodecyl tributyl phosphonium bromide(DDTB) into layered α-zirconium phosphate(ZrP) through ion-exchange method,and the resulting DDTB-ZrPs were characterized by FTIR,XRD,TEM,and TGA/DTG techniques.Minimum inhibitory concentration(MIC) was used to evaluate antibacterial activity.The results show that the DDTB are intercalated into ZrP and the basal spacing of DDTB-ZrP is enlarged with the increase in phosphonium salt content.DDTB-ZrP-1 with 5.61wt% of DDTB,shows the highest temperature resistant,the 5% weight loss temperature could be up to 320 ℃ and the max decomposition rate temperature reaches to 384℃.DDTB-ZrP-6 with 26.46wt% of DDTB displays the highest antibacterial activity for the MIC against E.coli and S.aureus of 80 and 15 mg·L-1,respectively.Further analyses indicate that along with the increase in the content of DDTB,the thermostability of DDTB-ZrPs decreases and the antibacterial activity improves.