In-situ synthesis of metal nanoparticles@metal−organic frameworks: Highly effective catalytic performance and synergistic antimicrobial activity

• Published in: Journal of hazardous materials Vol. 387; p. 121687
• Main Authors: Qi, Ye, Ye, Junwei, Ren, Shuangsong, Lv, Jialin, Zhang, Siqi, Che, Ying, Ning, Guiling
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 05.04.2020
• Subjects: Anti-Bacterial Agents - chemical synthesis; Anti-Bacterial Agents - chemistry; Anti-Bacterial Agents - pharmacology; Catalysis; Catalytic reduction; Escherichia coli - drug effects; In-situ reduction; Metal nanoparticle; Metal Nanoparticles - chemistry; Metal-Organic Frameworks - chemical synthesis; Metal-Organic Frameworks - chemistry; Metal-Organic Frameworks - pharmacology; Nitrophenols - chemistry; Oxidation-Reduction; Reactive Oxygen Species - metabolism; Rhodamines - chemistry; Staphylococcus aureus - drug effects; Synergistic antimicrobial activity; Zinc - chemistry; Zinc boron-imidazolate frameworks; Catalytic reduction; In-situ reduction; Metal nanoparticle; Zinc boron-imidazolate frameworks; Synergistic antimicrobial activity
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2019.121687

[Display omitted] •M-NP@Zn-BIF composites were successfully in-situ synthesized.•These composites exhibited excellent catalytic activity to convert 4-NP to 4-AP.•Ag@Zn-BIF showed a highly synergistic antibacterial activity.•Antibacterial mechanism was proposed for the generation of intracellular ROS levels.•M-NP@Zn-BIF composites showed significant enhancement on photocatalytic activity. M-NP@Zn-BIF (M-NP = Ag or Cu nanoparticle; Zn-BIF is a zinc-based boron imidazolate framework, Zn2(BH(2-mim)3)2(obb); 2-mim = 2-methylimidazole; obb = 4,4′-oxybis(benzoate)) composites were successfully in-situ synthesized by utilizing the reducing ability of the BH bond contained in the Zn-BIF at room temperature without any additional chemical reduction reagents. These composites (225 μg/mL) exhibited excellent catalytic activity to convert 4-nitrophenol to 4-aminophenol in 2.5 min and 6 min with a conversion rate of 99.9 %, respectively. In addition, Ag@Zn-BIF (50 μg/mL) showed highly synergistic antibacterial activity against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) with a bactericidal rate of approximately 99.9 %. An antibacterial mechanism was proposed for the generation of intracellular reactive oxygen species (ROS) levels. Superoxide radicals (O2–) and hydroxyl radicals (OH) formed during the antibacterial process were shown to accelerate the death of bacteria. They also exhibited highly photocatalytic activity for Rhodamine B (RhB). When the concentration of the composites is 1000 μg/mL, the photocatalytic efficiency of Ag@Zn-BIF and Cu@Zn-BIF increased by 31.62 and 18.13 times compared with Zn-BIF, respectively. All in all, this study developed a simple and versatile integrated platform for the removal of nitrophenols, organic dyes, and the effective inactivation of bacteria in water.