Inactivation of Escherichia coli in water by silver-coated Ni0.5Zn0.5Fe2O4 magnetic nanocomposite: a Box–Behnken design optimization

Abstract

The present research studied the antibacterial effect of silver-coated Ni 0.5 Zn 0.5 Fe 2 O 4 magnetic nanoparticles on Gram-negative bacteria Escherichia coli (E. coli) from water. The effects of pH (6, 7 and 9), disinfectant dose (2, 5 and 10 g/L) and contact time (10, 20 and 30 min) have been also investigated. To obtain important factors, the interactions between factors and optimal experimental design in surface response method were used based on Box-Behnken design. According to the research findings, the system is efficient in eliminating E. coli. The results showed that E. coli elimination efficiency intensified through increasing the amount of nanoparticles from 2 to 10 g/L. The results also demonstrated no significant change in E. coli elimination through pH increasing of 6 to 9. Expanding contact time from 10 to 30 min also heightened E. coli elimination rate. R 2 for E. coli elimination is 0.9994 indicating a good agreement between model experimental data and forecasting data.

Inactivating pathogenic bacteria in greywater by biosynthesized Cu/Zn nanoparticles from secondary metabolite of Aspergillus iizukae; optimization, mechanism and techno economic analysis

“…In the optimization study of E . coli inactivation by Asadi and Moeinpour [43], the results also revealed that high inactivation rate of E . coli within a short time (30 min) was recorded with increasing of silver-coated magnetic nanocomposite concentration from 2 to 10 mg mL -1 .…”

Photocatalytic Detoxification of Antibiotic- and Bacteria-Contaminated Water using Cobalt-Doped Ni–Zn Ferrites Magnetic Separable Nanopowders

“…It was discovered that doping or combining with other metal oxide semiconductors improved the ferrites' adsorption ability, specific surface area, and light-driven photoactivity (Qasim et al 2015;Ifebajo et al 2020;Nag et al 2020). Doping the photocatalyst with high conductivity metal ions like Co, Ag, and Pt induces highly efficient electron mobility and delays the recombination step of photo-generated electrons/holes, resulting in increased photocatalyst degradation operation (Sinha 2021;Asadi and Moeinpour 2019;Chahal et al 2020). For example, Sinha 2021 reported that by doping Bismuth-based ferrite with Co dopant, the crystallite size of the nanostructured material was reduced and the bandgap energy was increased from 2.07 eV to 2.43 eV, resulting in increased photocatalysis and remarkable optoelectronic activity.…”

“…Because of its low cost, higher performance, strong oxidation potential, and faster reaction rates, semiconductor photocatalysis is a viable and environmentally friendly solution for removing antibiotic and bacteria contamination from water (Aali et al 2019;Asadi et al, 2019;Tran et al 2019ab;Varma et al 2020b;Azalok et al 2021ab). In recent years, single metal oxide semiconductors such as In2O3, TiO2 and ZnO have been widely applied and considered efficient to eliminate hazardous contaminants in wastewater owing to their cost-effectiveness, oxidative potential and catalytic stability for widespread environmental applications (Elmolla et al 2010;Bokare et al 2013;Tran et al 2019b).…”

“…In recent years, mixed metal oxide spinel ferrites (MxM1-xFe2O4, where M is a different metal cation i.e. Ni, Mg, Ca, Zn, Ag, Co, Cr)-based semiconductors have sparked a lot of interest in the field of photocatalysis because of their diverse optoelectronic properties and topological metal sites structure (Manikandan et al 2015;Kefeni and Mamba 2020); and have been applied to decompose varieties of organic pollutants and inactivate bacteria during water treatment of wastewater (Chen et al 2017;Asadi and Moeinpour 2019;Tsvetkov et al 2019).…”

Preparations and characterisation of a nanosilver‐loaded aerogel based on nanocellulose

“…In the field of water treatment, AgNPs have played both antibacterial and catalytic roles. For example, Ag‐coated nanocomposites can be used to eliminate Gram‐negative bacteria Escherichia coli ( E. coli ) from water [7, 8]. Methylene blue (MB) is a typical organic pollutant in printing and dye wastewater [9].…”