Topic:

Infection control, nosocomial infections and critical care

Abstract No.:

ISE.335

Title:

Inactivation of water microbial indicator by surface modified iron doped ZnO under mild hydrothermal conditions

Author(s):

A. Maleki¹, B. Shahmoradi², H. Daraii³, R. Ebrahimi²; ¹Kurdistan University of Medical Sciences, Environmrntal Health Research Center, Sanandaj/IR, ²Kurdistan University of Medical Sciences, Environmental Health Research Center, Sanandaj/IR, ³ Kurdistan University of Medical Sciences, Environmental Health Research Center, Sanandaj/IR

Abstract:

Background: Microbial inactivation of water using conventional disinfection techniques such as chlorination result in production of by-products like THMs. Moreover, the conventional methods of synthesizing nanomaterials bring about agglomeration and poor dispersion of the nanomaterials fabricated.
Methods: Hence, applying a new strategy like surface modification using a suitable capping agent or organic ligands could improve these properties. The iron doped ZnO nanomaterials were surface modified under mild hydrothermal conditions (P= autogenous, T= 100°C, t= 18 hr).
Results: The nanomaterials synthesized were characterized using Powder XRD, FTIR, SEM, XRF, and UV-Vis spectrophotometer. The characterization results revealed high crystallinity, less agglomeration and suitable morphology for microbial inactivation. The systematic inactivation of water microbial indicator was carried out using surface modified nanomaterials by changing different variables affecting the inactivation efficiency.
Conclusion: The photocatalytic activity was thus dependent on dopants and light intensity. Microscopic characterization demonstrated that visible-light photocatalysis on nano ZnO caused damage on the bacterial cell wall and the cell membrane.