Exploring the potential of magnetic antimicrobial agents for water disinfection

Pina, Ana Sofia; Batalha, Íris L.; Fernandes, Cláudia S.M.; Aoki, Matheus A.; Roque, Ana C. A.

doi:10.1016/j.watres.2014.08.024

Cited by 22 publications

(7 citation statements)

References 30 publications

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“…Generally, the effectiveness of a disinfectant on its target can be described as bacteriostatic or bactericidal. Bacteriostatic refers to the phenomenon in which bacteria are inhibited partially or totally from reproducing by the addition of disinfectant, and bactericidal means killing the bacteria . In this study, the effectiveness of disinfection was determined by comparing the OD 600 of samples exposed to disinfectants with that of the control at the same contact time.…”

Section: Resultsmentioning

confidence: 99%

“…Bacteriostatic refers to the phenomenon in which bacteria are inhibited partially or totally from reproducing by the addition of disinfectant, and bactericidal means killing the bacteria. 26 In this study, the effectiveness of disinfection was determined by comparing the OD 600 of samples exposed to disinfectants with that of the control at the same contact time. Measurement of OD 600 is a common technique for estimating the concentration of bacteria in microbiology, as the OD 600 is quantitatively related to the biomass in cell suspension within a certain range.…”

Section: Comparison Of the Disinfection Effect With Variousmentioning

confidence: 99%

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Redesigning Water Disinfection Using Recyclable Nanomaterials and Metal Ions: Evaluation with Escherichia coli

Gao

Keller

2020

ACS EST Water

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We present a novel disinfection method that redesigns the conventional approach, by recycling the disinfectant. This can lead to lower energy requirements and minimize environmental impacts. In this study, metal ions were mixed with target microorganisms in water for disinfection, followed by the sorption of metal ions with magnetic nanoparticles for reuse. As a proof of concept, the disinfection effectiveness values of various metal ions (e.g., Ag + , Cu 2+ , and Zn 2+ ) on a target microorganism, Escherichia coli K12, were compared. Only Ag + exhibited a bactericidal effect on E. coli K12, while Cu 2+ and Zn 2+ just reduced the growth rate. The disinfection efficiency of Ag + remained stable within a range of environmental conditions (pH, temperature, water hardness, nutrient content, and initial cell concentration), indicating that Ag + speciation and effectiveness are not modified. The initial ratio of Ag + per cell is a major factor that will determine disinfection effectiveness. Sorption of Ag + by one type of magnetic nanomaterial (Mag-Ligand) was studied to explore the removal of Ag + after disinfection. Mag-Ligand can effectively decrease the concentration of Ag + from 100 mg/L to ∼100 μg/L in one cycle, and below 10 μg/L in three recovery cycles. Changes in environmental conditions (pH, concentration of Cl − , water hardness, and addition of E. coli K12) were studied to determine how these changes will affect the sorption process. The results showed that sorption capacity will be influenced when the concentration of free Ag + is decreased (e.g., when the Cl − concentration is increased) or when there are competitive metal ions in the aqueous environment (i.e., water hardness). Sorption efficiency remained stable when the speciation of Ag + was not influenced (e.g., pH and addition of E. coli K12). The regeneration of Ag + was studied to evaluate the reuse of the disinfectant. We demonstrate that Ag + can be recovered after sorption in an acidic environment, and the recovery remains >80% after five continuous cycles, indicating that this disinfection method may be sustainable for practical use.

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Section: Resultsmentioning

confidence: 99%

Section: Comparison Of the Disinfection Effect With Variousmentioning

confidence: 99%

Redesigning Water Disinfection Using Recyclable Nanomaterials and Metal Ions: Evaluation with Escherichia coli

Gao

Keller

2020

ACS EST Water

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“…However, since hydroxyl radicals are strong oxidants, DBPs similar to those found in ozone processes can be produced and cytotoxicity of catalyst particles requires further studies. Other examples of disinfection processes are based on membranes [40], hydrodynamic cavitation [41], nanoparticles such as in photocatalysis or in membranes [42], or with magnetic materials [43]. However, more work is needed so that these processes can be put into practice.…”

Section: Other Disinfection Processesmentioning

confidence: 99%

The Role of Catalytic Ozonation Processes on the Elimination of DBPs and Their Precursors in Drinking Water Treatment

2021

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Formation of disinfection byproducts (DBPs) in drinking water treatment (DWT) as a result of pathogen removal has always been an issue of special attention in the preparation of safe water. DBPs are formed by the action of oxidant-disinfectant chemicals, mainly chlorine derivatives (chlorine, hypochlorous acid, chloramines, etc.), that react with natural organic matter (NOM), mainly humic substances. DBPs are usually refractory to oxidation, mainly due to the presence of halogen compounds so that advanced oxidation processes (AOPs) are a recommended option to deal with their removal. In this work, the application of catalytic ozonation processes (with and without the simultaneous presence of radiation), moderately recent AOPs, for the removal of humic substances (NOM), also called DBPs precursors, and DBPs themselves is reviewed. First, a short history about the use of disinfectants in DWT, DBPs formation discovery and alternative oxidants used is presented. Then, sections are dedicated to conventional AOPs applied to remove DBPs and their precursors to finalize with the description of principal research achievements found in the literature about application of catalytic ozonation processes. In this sense, aspects such as operating conditions, reactors used, radiation sources applied in their case, kinetics and mechanisms are reviewed.

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“…The inactivation mechanism of E. coli by M-GO includes both the membrane stress and oxidation stress during the incubation period [219]. PEG-coated MNPs functionalized with H-RWRWRW-NH2 ((RW)3), an antimicrobial peptide, is used as a novel magnetic-responsive support against E. coli and B. subtilis 168 [220]. MNPs pre-coated with oleic acid and bearing novel antimicrobial N-heterocyclic choline analogues, namely O-, N-and O,N-bis-undecyl-substituted N-(2-hydroxyethyl)-1,2,3,4-tetrahydroisoquinolinium derivatives, are effective antimicrobial therapy for Gram-positive (S. aureus, B. cereus) and Gram-negative (E. coli, P. aeruginosa, P. mirabili) bacterial strains and fungi (C. albicans, A. niger) [221].…”

Section: Wastewater and Surface Water Treatment 61 Magnetic Antimicmentioning

confidence: 99%

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

2017

Journal of Hazardous Materials

295

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Exploring the potential of magnetic antimicrobial agents for water disinfection

Cited by 22 publications

References 30 publications

Redesigning Water Disinfection Using Recyclable Nanomaterials and Metal Ions: Evaluation with Escherichia coli

Redesigning Water Disinfection Using Recyclable Nanomaterials and Metal Ions: Evaluation with Escherichia coli

The Role of Catalytic Ozonation Processes on the Elimination of DBPs and Their Precursors in Drinking Water Treatment

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

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