NGHIÊN CỨU TĂNG ĐỘ BỀN CHỐNG RỬA TRÔI CỦA VẬT LIỆU KHÁNG KHUẨN NANOCOMPOZIT Fe3O4/POLYHEXAMETYLEN GUANIDIN HYDROCLORIT

Tóm tắt

The contamination of water resources by pathogenic bacteria can cause transmission of disease in
community, so development of the effective and safe disinfectants is especially important. Guanidinebased polymers are well-known strong antimicrobial agents against a wide range of microorganisms.
However, the high water solubility restricted their potential applications in the field of water treatment.
In this study, Magnetic nanoparticles were prepared from spent pickling liquors and used for
nanocomposite synthesis with polyhexamethylene guanidine hydrochloride (PHMG) in presence of
epichlorohydrin (Ep) and then used for synthesis of nanocomposite with Fe3O4 nanoparticles. The
measurements of PHMG release from nanocomposite showed that washing resistance of Fe3O4/PHMG
nanocomposite has been clearly improved by using modifying agent Ep. As-prepared nanocomposite
Fe3O4/PG-Ep demonstrated very good antibacterial activity against Escherichia coli (E.coli). With 2
ppm of Fe3O4/PHMG-Ep, after 5 minutes of exposure, they can kill 100% of E.coli with initial
concentration ~7.7.105 CFU/mL. Furthermore, this material showed also a good reusability, with the
bactericidal effect obtained 100% and 99.99%. for the 2nd and 3rd test, respectively, of the same
material.