摘要
依次将铜离子和十四烷基三丁基季鏻阳离子(TBTP)与蒙脱土离子交换得到季鏻盐-铜/蒙脱土复合材料(TBTP-Cu/MMT),其中铜和季鏻阳离子的质量含量分别为2.87%和24.07%。热重(TG)、X射线衍射(XRD)分析结果表明,铜离子和季鏻阳离子确实交换到蒙脱土中,并且TBTP-Cu/MMT中季鏻阳离子的热分解起始温度约为220℃,具有较好的热稳定性。抗菌试验结果表明,TBTP-Cu/MMT具有较好的抗菌性能,对金黄色葡萄球菌和大肠杆菌最小抑菌浓度(MIC)分别为12.5μg.mL-1和200μg.mL-1。研究了蒙脱土复合材料浓度及与细菌的接触时间对抗菌性能的影响,发现随着浓度的增加、接触时间的延长,活菌数减少,抗菌性能提高;将100 mg TBTP-Cu/MMT在100 mL蒸馏水中浸泡20天后,季鏻阳离子和Cu2+的释放量很小,分别为4.891 mg.L-1和1.928 mg.L-1,表明TBTP-Cu/MMT具有良好的耐水性。
Na-montmorillonite （Na-MMT） was exchanged with Cu^2＋ and tributyhetradecyl phosphonium cation （TBTP） in turn by the ion-exchange method. The mass fractions of TBTP and Cu^2＋ were 24.07% and 2.87%, respectively. The results of TG and XRD show that Cu^2＋ and TBTP have been exchanged in montmorillonite, and the onset decomposition temperature of the quaternary phosphonium cation is about 220℃. The antimicrobial experiment indicates that the montmorillonite composite materials （TBTP-Cu/MMT） possess wonderful antimicrobial activity and the minimal inhibitory concentrations （MIC） are 12.5μg·mL^-1 and 200μg·mL^-1 against S. aureus and E. coli, respectively. The influences of the concentration of TBTP-Cu/MMT and contacting time with bacteria on the antimicrobial activity of the modified montmorillonite were studied. The result indicates that their antimicrobial activities increase with increasing the concentration and contacting time with bacteria. After 100 mg TBTP-Cu/ MMT being soaked in water for 20 days, the release amounts of TBTP and Cu^2＋ from the montmorillonite composite materials are only 4. 891 mg.L^-1 and 1. 928 mg·L^-1 , respectively.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2006年第3期82-86,共5页
Acta Materiae Compositae Sinica
基金
广东省自然科学基金项目(05200555)
广东省科技计划项目(2004B20201026)
暨南大学引进优秀人才科研启动基金(5105013)
关键词
季鳞盐
铜离子
蒙脱土复合材料
抗菌性能
quaternary phosphonium salts
Cu^2＋
montmorillonite composite material
antimicrobial activity
