Antimicrobial activity of silver loaded MnO2 nanomaterials with different crystal phases against Escherichia coli

Wang, Lian; He, Hong; Zhang, Changbin; Sun, Li; Liu, Sijin; Wang, Shaoxin

doi:10.1016/j.jes.2015.04.026

Cited by 28 publications

(14 citation statements)

References 36 publications

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“…Among these metal oxides, MnO 2 showed the excellent catalytic performance on benzene series degradation due to its strong redox coples of Mn 2+ /Mn 3+ and Mn 3+ /Mn 4+ on the surface of catalysts, diverse and crystallographic structure [7,15]. MnO 2 has great structural flexibility and crystallographic polymorphs (e.g., α-, β-, γ-, and δ-MnO 2 ) because the basic structural MnO 6 units can be linked in different manners forming tunnels [16]. α-MnO 2 has been extensively studied due to its structural characteristics and excellent activity for ozone decomposition and catalytic ozonation [17,18].…”

Section: Introductionmentioning

confidence: 99%

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Zhang

Dong

Han

et al. 2022

Environmental Engineering Research

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In this paper, Cobalt-doped α-MnO2 (i.e., Co-α-MnO2) were synthesized through hydrothermal method. Phenol was employed as targeted pollutants to investigate the catalytic ozonation performance of Co-α-MnO2. Results showed that Co-α-MnO2 significantly improved the phenol removal increased to 97.47 % after 40 min, which was 16.46 %, 38.92 % higher than that of α-MnO2 catalytic ozonation and single ozonation without catalyst. Additionally, the physicochemical properties of α-MnO2 and Co-α-MnO2 were analyzed using technologies such as XRD, TEM, BET and XPS. Compared to α-MnO2, Co-α-MnO2 has larger specific surface area (79.496 m 2 /g) and pore volume (0.0396 cm 3 /g), higher Mn 3+ relative content (41.16 %) and adsorbed oxygen content (18.99 %). Also, the oxygen vacancy content, lattice defect content and surface hydroxyl content of Co-α-MnO2 are higher than that of α-MnO2, which could result in higher catalytic oxidation performance of Co-α-MnO2. The influence of masking agent showed that surface hydroxyl group, •OH and •O 2were involved in the catalytic ozonation of phenol. This study could help recognize the role of surface hydroxyl groups and active free radicals and demonstrate the contribution of reactive oxygen species on phenol removal in Co-α-MnO2 systems.

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Section: Introductionmentioning

confidence: 99%

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Zhang

Dong

Han

et al. 2022

Environmental Engineering Research

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“…The crystal structures of as-prepared samples (β-MnO 2 and AgBr) including AgBr/β-MnO 2 nanocomposites with the varying molar ratio of AgBr are presented in Figure . As can be seen from the obtained results, different diffraction peaks located at 28.63, 37.30, 40.84, 42.81, 56.60, 59.36, 65.87, 67.43, and 72.36° correspond to the (110), (101), (200), (111), (211), (220), (002), (310), and (301) tetragonal phases of pure photocatalyst β-MnO 2 . − The AgBr diffraction peaks centered at 26.68, 31.0, 44.4,52.69, 55.04, 64.2, and 73.36° were attributed to (111), (200), (220), (311), (222), (400), and (420) crystal planes of hexagonal AgBr. ,, The AgBr/β-MnO 2 nanocomposites have the same diffraction peaks as those of AgBr. At the same time, the diffraction peaks of β-MnO 2 are so weak that they are difficult to observe in AgBr/β-MnO 2 nanocomposites compared with AgBr, which may be due to the small amount of β-MnO 2 in the nanocomposite materials, and its existence was later confirmed by the EDS.…”

Section: Resultsmentioning

confidence: 78%

“…As can be seen from the obtained results, different diffraction peaks located at 28.63, 37.30, 40.84, 42.81, 56.60, 59.36, 65.87, 67.43, and 72.36° correspond to the (110), (101), (200), (111), (211), (220), (002), (310), and (301) tetragonal phases of pure photocatalyst β-MnO 2 . 65 − 67 The AgBr diffraction peaks centered at 26.68, 31.0, 44.4,52.69, 55.04, 64.2, and 73.36° were attributed to (111), (200), (220), (311), (222), (400), and (420) crystal planes of hexagonal AgBr. 56 , 58 , 68 The AgBr/β-MnO 2 nanocomposites have the same diffraction peaks as those of AgBr.…”

Section: Resultsmentioning

confidence: 99%

“…The dissolved mixture was transferred into an autoclave (100 mL) and heated at 140 °C for 12 h. The obtained product was filtered, washed several times with water and ethanol, and then dried at 70 °C overnight. 65 2.3. Synthesis of the AgBr/β-MnO 2 Nanocomposite.…”

Section: Methodsmentioning

confidence: 99%

“…β-MnO 2 was synthesized by stirring a mixture of 1.69 g of manganese sulfate monohydrate (MnSO 4 ·H 2 O) and 2.28 g of ammonium persulfate ((NH 4 ) 2 S 2 O 8 ) in 80 mL of water. The dissolved mixture was transferred into an autoclave (100 mL) and heated at 140 °C for 12 h. The obtained product was filtered, washed several times with water and ethanol, and then dried at 70 °C overnight …”

Section: Methodsmentioning

confidence: 99%

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Direct Z-Scheme AgBr/β-MnO₂Photocatalysts for Highly Efficient Photocatalytic and Anticancer Activity

Warshagha

Danish

2022

ACS Omega

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The preparation of visible light-responsive efficient photocatalysts for removing organic contaminants from water and killing cancer cells has gotten a lot of attention due to the growing global concern. In this study, we have successfully fabricated an efficient AgBr/β-MnO 2 nanocomposite via a facile deposition and precipitation method at room temperature. Techniques such as XRD, SEM-EDS, TEM, DRS, PL, EIS, ESR, and FTIR were used to determine the crystalline, structural, morphological, optical, and other properties. The SEM and TEM analyses reveal that AgBr NPs are decorated on the surface of β-MnO 2 , which possesses rods with a sphere-like structure for AgBr/β-MnO 2 . The EDX analysis confirms the existence of Mn, O, Ag, and Br elements in the nanocomposites without an extra peak, indicating that the synthesized samples are highly pure. The high photocatalytic performance of AgBr/β-MnO 2 could be attributed to the formation of Ag NPs and the construction of the Z-scheme heterojunction between AgBr and β-MnO 2 . This may enhance fast light absorption and efficient photogenerated (e–/h+) pairs, as indicated by EIS and photoluminescence measurements, which in turn achieved high activity for the decomposition of MB (97%, in 12 min), RhB (98.9%, in 9 min), and paracetamol (80%, in 180 min), respectively. The kinetic model study proposed that the first-order model showed a better fit than the zero- and second-order for the photocatalytic decolorization of RhB dye. XRD analysis of 0.2 AgBr/β-MnO 2 before and after recycling confirms the high stability of the catalyst. HPLC results showed that no detectable by-products are produced through the decomposition of paracetamol. Interestingly, 0.2 AgBr/β-MnO 2 nanocomposites showed visible light-induced anticancer activity against A549 cancer cell lines. The mechanistic degradation pathway has been proposed using the involvement of active species like superoxide radicals ( −• O 2 ) and photoinduced holes (h + ). The proposed work focuses on synthesizing effective photocatalysts in a less hazardous environment with superior biological activity.

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MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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Antimicrobial activity of silver loaded MnO2 nanomaterials with different crystal phases against Escherichia coli

Cited by 28 publications

References 36 publications

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Direct Z-Scheme AgBr/β-MnO₂Photocatalysts for Highly Efficient Photocatalytic and Anticancer Activity

MnO₂‐Based Materials for Environmental Applications

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Antimicrobial activity of silver loaded MnO2 nanomaterials with different crystal phases against Escherichia coli

Cited by 28 publications

References 36 publications

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Phenol Removal Performance and Mechanism Using Catalytic Ozonation with the Catalyst of Cobalt-doped α-MnO2

Direct Z-Scheme AgBr/β-MnO2Photocatalysts for Highly Efficient Photocatalytic and Anticancer Activity

MnO2‐Based Materials for Environmental Applications

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Product

Resources

About

Direct Z-Scheme AgBr/β-MnO₂Photocatalysts for Highly Efficient Photocatalytic and Anticancer Activity

MnO₂‐Based Materials for Environmental Applications