A Nickel-Containing Polyoxomolybdate as an Efficient Antibacterial Agent for Water Treatment

Area of Science:

• Inorganic Chemistry
• Materials Science
• Environmental Science

Background:

• Pathogenic microorganisms and organic contaminants pose significant water pollution challenges.
• There is an urgent need for non-toxic, environmentally friendly, and efficient antimicrobial agents for water purification.

Purpose of the Study:

• To synthesize and characterize a novel nickel-based Keggin polyoxomolybdate compound.
• To evaluate its efficacy as an antimicrobial agent against pathogenic bacteria.
• To assess its capability for adsorbing basic fuchsin dyes from wastewater.

Main Methods:

• Facile hydrothermal synthesis of the nickel-based Keggin polyoxomolybdate [Ni(L)(HL)]2H[PMo12O40]·4H2O (1).
• Characterization of the compound using standard analytical techniques.
• Determination of minimum inhibitory concentration (MIC) and time-kill studies for antibacterial activity.
• Adsorption experiments using basic fuchsin dyes, analyzed with pseudo-second-order kinetics and Freundlich isotherm models.

Main Results:

• Compound 1 exhibited high stability across a pH range of 4-10.
• Demonstrated significant antibacterial activity with low MIC values against S. aureus, B. subtilis, E. coli, and A. tumefaciens.
• Achieved 99.9% bacterial kill for E. coli and S. aureus in time-kill studies.
• Showed effective adsorption of basic fuchsin dyes with a maximum adsorption capacity of 29.81 mg/g, following pseudo-second-order kinetics and Freundlich isotherm models.

Conclusions:

• The nickel-based Keggin polyoxomolybdate compound 1 is a stable and effective antimicrobial agent.
• Its antibacterial properties stem from the synergistic effect between its cationic and anionic components.
• Compound 1 shows potential for the removal of pathogenic bacteria and basic fuchsin dyes from wastewater.
• This research offers a promising solution for integrated water remediation strategies.