Growth inhibition of Escherichia coli by zinc molybdate with different crystalline structures

Abstract

Zinc molybdate powders were synthesized by hydrothermal methods using different salt precursors, and in the presence (or absence) of citric acid as surfactant. As a function of precursors, synthesis conditions and post-synthesis annealing, powders with various sizes (from tens of nm up to 10 mm) and different crystallographic structures (a, b, hydrated, and nonhydrated mixed aand b-phases) were obtained. Bactericidal properties of suspensions containing different concentrations (1, 5, and 10 mM) of powders of a, b, and mixed a/b ZnMoO 4 phases were tested against Escherichia coli. Optical density measurements and the results obtained from the observation of cultures growth on agar petri dishes clearly showed that ZnMoO 4 possesses antibacterial properties. The antibacterial efficiency was dependent on the concentration of powders in suspension, as well as on the crystalline structure in relation to the crystals size/surface structuring. The intrinsic semiconducting properties of this material, together with the defect states present in the bandgap which hindered the recombination of electronhole pairs produced under visible light, as well as electronic transitions were factors proposed as being responsible for the observed antibacterial activity by the creation of reactive oxygen species and hydrogen peroxide.

Review on the Versatility of Tungsten Oxide Coatings

“…Also, the photogenerated hole can react with the H 2 O molecule leading to the formation of hydroxyl radicals ( • OH). These species, known as reactive oxygen species (ROS), are responsible for microorganisms inactivation via oxidative stress inflicted upon the cell's membrane . Most of the research studies have been performed with powders, rather than coatings.…”

“…These species, known as reactive oxygen species (ROS), are responsible for microorganisms inactivation via oxidative stress inflicted upon the cell's membrane. [102,103] Most of the research studies have been performed with powders, rather than coatings. Gondal et al [104] synthesized nano-WO 3 with different values of the bandgap (2.61 and 2.71 eV) and under laser irradiation they achieved water disinfection from Escherichia coli (E. coli).…”

Preparation and Characterization of α-Zinc Molybdate Catalyst: Efficient Sorbent for Methylene Blue and Reduction of 3-Nitrophenol

“…It is used as a white pigment [ 1 ]. This material was used in a variety of applications, such as photocatalysis [ 2 , 3 , 4 , 5 ], as phosphor for light emitting diode [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ], electrochemical anode material for lithium batteries [ 14 ], in scintillating bolometers for double beta decay of 100 Mo [ 15 , 16 ], humidity sensors [ 17 ], antibacterial [ 18 ], biological imaging of deep tumors [ 19 ], supercapacitor [ 20 ], and as catalyst in the oxidation of propane and propene [ 21 , 22 ]. Traditionally, the zinc molybdate varieties are prepared by a conventional solid-state reaction [ 8 , 12 ], hydrothermal or solvothermal [ 2 , 5 , 7 , 10 , 11 , 19 , 20 ], mechanochemical [ 23 ], combustion synthesis [ 24 ], co-precipitation [ 3 , 19 , 25 ], sol-gel [ 26 ], or sonochemical method [ 6 ].…”

Structural, Dielectric and Optical properties for (Polyvinyl Alcohol–Polyethylene Oxide- Manganese Oxide) Nanocomposites

“…This behavior may be due to the fact that at lower frequencies, the dipoles have sufficient time to align with the applied field before it changes its direction. Consequently, the dielectric loss is high [16]. The dielectric constant and dielectric loss decrease with the increase of MnO 2 nanoparticles concentration, this result can be attributed to the increase in conductivity as a result of the increase charge carrier density in polymer matrix [17][18][19][20][21][22][23][24][25], as shown in Fig.…”