Surface-dependent photocatalytic and biological activities of Ag2CrO4: Integration of experiment and simulation

Assis, Marcelo; Foggi, Camila Cristina de; Teodoro, Vinícius; Costa, João Paulo de Campos da; Silva, Carlos Eduardo; Robeldo, Thaiane; Caperucci, Priscila Fernanda; Vergani, Carlos Eduardo; Borra, Ricardo Carneiro; Sorribes, Iván; Gouveia, Amanda Fernandes; San-Miguel, Miguel A.; Andrés, Juán; Longo, E.

doi:10.1016/j.apsusc.2021.148964

Cited by 25 publications

(20 citation statements)

References 68 publications

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“…Herein, we used the Langmuir− Hinshelwood (L− H) kinetic model to obtain the kinetic constants of the photodegradation reaction (Fig. 6c,d) [72,73]. For all samples, a R 2 greater than 0.89 was obtained, indicating that the kinetic model used was suitable for the photodegradation of RhB [74].…”

Section: Photocatalytic Degradation Of Rhodamine-b and 4-nitrophenolmentioning

confidence: 93%

Efficient Ni and Fe doping process in ZnO with enhanced photocatalytic activity: A theoretical and experimental investigation

Lemos

Rezende

Assis

et al. 2022

Materials Research Bulletin

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Section: Photocatalytic Degradation Of Rhodamine-b and 4-nitrophenolmentioning

confidence: 93%

Efficient Ni and Fe doping process in ZnO with enhanced photocatalytic activity: A theoretical and experimental investigation

Lemos

Rezende

Assis

et al. 2022

Materials Research Bulletin

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“…It is reported that surface microbial encrustation can cause a series of microbial infections due to the contact of the contaminated surface with the host. Since the antimicrobial activity of these semiconductors against a number of different microorganisms is already known, bacteria (S. aureus and E.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the released H + in the valence band (VB) interacts with •O 2 – , which in turn reacts by forming the hydroperoxyl radical (•OOH) . In previous works, it was possible to identify through scavenger tests that these ROS are responsible for the antimicrobial and photocatalytic activity of α-Ag 2 WO 4 , β-Ag 2 MoO 4 , and Ag 2 CrO 4 . ,,, These ROS generated by Ag 2 XO 4 (X = W, Mo, and Cr) semiconductors can interact with lipids, nucleic acids, proteins, and other components, causing the death of these microorganisms . In addition, ROS can interact with polyunsaturated fatty acids of the microbial membranes, initiating their lipid peroxidation. , As a consequence, there is a decrease in their fluidity and the formation of other products (such as aldehydes), which in turn changes their protein composition, contributing to microbial death. , Another target of ROS is to induce single and double stranded DNA/RNA breakage to impair and/or inactivate replication processes as expected .…”

Section: Resultsmentioning

confidence: 99%

Polypropylene Modified with Ag-Based Semiconductors as a Potential Material against SARS-CoV-2 and Other Pathogens

Assis

Ribeiro

Gonçalves

et al. 2022

ACS Appl. Polym. Mater.

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The worldwide outbreak of the coronavirus pandemic (COVID-19) and other emerging infections are difficult and sometimes impossible to treat, making them one of the major public health problems of our time. It is noteworthy that Ag-based semiconductors can help orchestrate several strategies to fight this serious societal issue. In this work, we present the synthesis of α-Ag 2 WO 4 , β-Ag 2 MoO 4 , and Ag 2 CrO 4 and their immobilization in polypropylene in the amounts of 0.5, 1.0, and 3.0 wt %, respectively. The antimicrobial activity of the composites was investigated against the Gram-negative bacterium Escherichia coli, the Gram-positive bacterium Staphylococcus aureus, and the fungus Candida albicans. The best antimicrobial efficiency was achieved by the composite with α-Ag 2 WO 4 , which completely eliminated the microorganisms in up to 4 h of exposure. The composites were also tested for the inhibition of SARS-CoV-2 virus, showing antiviral efficiency higher than 98% in just 10 min. Additionally, we evaluated the stability of the antimicrobial activity, resulting in constant inhibition, even after material aging. The antimicrobial activity of the compounds was attributed to the production of reactive oxygen species by the semiconductors, which can induce high local oxidative stress, causing the death of these microorganisms.

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“…and devices for disinfection of surfaces/surroundings. In particular, different complex silver-based oxides with potent antibacterial and antifungal activities have been presented, such as Ag 2 CrO 4 6 , 7 , the three polymorphs of Ag 2 WO 4 8 , 9 , Ag 3 PO 4 10 , 11 , α-AgVO 3 12 and β-Ag 2 MoO 4 13 . To provide a deeper understanding and establish a correlation among morphology, surface energy and biocidal activity, first principles calculations were conducted at the density functional theory (DFT) level to complement and rationalize the experimental findings 14 .…”

Section: Introductionmentioning

confidence: 99%

Inactivation of SARS-CoV-2 by a chitosan/α-Ag2WO4 composite generated by femtosecond laser irradiation

Silva

Pimentel

Pinatti

et al. 2022

Sci Rep

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In the current COVID-19 pandemic, the next generation of innovative materials with enhanced anti-SARS-CoV-2 activity is urgently needed to prevent the spread of this virus within the community. Herein, we report the synthesis of chitosan/α-Ag2WO4 composites synthetized by femtosecond laser irradiation. The antimicrobial activity against Escherichia coli, Methicilin-susceptible Staphylococcus aureus (MSSA), and Candida albicans was determined by estimating the minimum inhibitory concentration (MIC) and minimal bactericidal/fungicidal concentration (MBC/MFC). To assess the biocompatibility of chitosan/α-Ag2WO4 composites in a range involving MIC and MBC/MFC on keratinocytes cells (NOK-si), an alamarBlue™ assay and an MTT assay were carried out. The SARS-CoV-2 virucidal effects was analyzed in Vero E6 cells through viral titer quantified in cell culture supernatant by PFU/mL assay. Our results showed a very similar antimicrobial activity of chitosan/α-Ag2WO4 3.3 and 6.6, with the last one demonstrating a slightly better action against MSSA. The chitosan/α-Ag2WO4 9.9 showed a wide range of antimicrobial activity (0.49–31.25 µg/mL). The cytotoxicity outcomes by alamarBlue™ revealed that the concentrations of interest (MIC and MBC/MFC) were considered non-cytotoxic to all composites after 72 h of exposure. The Chitosan/α-Ag2WO4 (CS6.6/α-Ag2WO4) composite reduced the SARS-CoV-2 viral titer quantification up to 80% of the controls. Then, our results suggest that these composites are highly efficient materials to kill bacteria (Escherichia coli, Methicillin-susceptible Staphylococcus aureus, and the yeast strain Candida albicans), in addition to inactivating SARS-CoV-2 by contact, through ROS production.

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Surface-dependent photocatalytic and biological activities of Ag2CrO4: Integration of experiment and simulation

Cited by 25 publications

References 68 publications

Efficient Ni and Fe doping process in ZnO with enhanced photocatalytic activity: A theoretical and experimental investigation

Efficient Ni and Fe doping process in ZnO with enhanced photocatalytic activity: A theoretical and experimental investigation

Polypropylene Modified with Ag-Based Semiconductors as a Potential Material against SARS-CoV-2 and Other Pathogens

Inactivation of SARS-CoV-2 by a chitosan/α-Ag2WO4 composite generated by femtosecond laser irradiation

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