Removing Escherichia coli from water using zinc oxide-coated zeolite. (15th September 2018)

• Record Type: Journal Article
• Authors: Wang, Lingling; Wu, Wenlin; Xie, Xiaolan; Chen, Hongbin; Lin, Jianming; Dionysiou, Dionysios D.
• Is Part Of: Water research. Volume 141(2018)
• Page Start: 145
• Page End: 151
• Publication Date: 2018-09-15
• Subjects: Escherichia coli -- Electrostatic interaction -- Adhesion -- Antibacterial properties -- Water purification; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2018.04.068
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: The removal of Escherichia coli ( E. coli ) from water by zinc oxide-coated zeolite (ZOCZ) and ZOCZ's antibacterial properties were examined in laboratory experiments using plate counting method and tests of cell apoptosis. Batch experiments showed that ZOCZ has a maximum removal capacity for E. coli of about 4.34 × 10 6 CFU g -1 at 25 °C. Element mappings confirm that zinc ions accumulate in the E. coli cells causing cell death. Pseudo-second-order kinetics and Freundlich isotherms were found to best describe the removal of E. coli, suggesting that a multilayer of E. coli cells forms on the surface of ZOCZ particles. Graphical abstract: Image 1 Highlights: Electrostatic attraction significantly affected the adhesion of E. coli on ZOCZ. CLSM images proved that the growth of E. coli was inhibited effectively. The interaction between E. coli and ZOCZ was evaluated by ATR-FTIR and FESEM. EDS Element mappings confirm that zinc ions accumulate in the E. coli cells. ZOCZ has enormous potential to be scaled-up for water treatment applications.