Bio-approach ZnO/Ag nano-flowers: enhanced photocatalytic and photoexcited anti-microbial activities towards pathogenic bacteria

Harinee, Subramanian; Muthukumar, Kaliappan; James, Rathinam Arthur; Arulmozhi, M.; Dahms, Hans-Uwe

doi:10.1016/j.mtsust.2022.100133

Cited by 11 publications

(10 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The CdS NPs are equally distributed across the spherical surface of the TiO2@ZnO NC. The post-annealing process could make the porous nature of the TiO2@ZnO-CdS (Lee et al, 2015;Yu et al, 2015;Harinee et al, 2022]. The results of TiO2@ZnO-CdS NC elemental analysis for EDAX spectrum demonstrated the existence of Ti, Si, O, Cd and S in hybrid material formation as shown in Figure 1d.…”

Section: Surface Morphology Investigationmentioning

confidence: 94%

TiO2@ZnO–CdS Nanocomposites for Sensing and Cytotoxicity Applications

C.¹,

Pragathiswaran²,

Balakrishnan³

et al. 2022

IJZI

View full text Add to dashboard Cite

In this study the sol-gel method was used to create a composite of titanium oxide nanoparticles (TiO2- NPs) @ ZnO nanoparticles (TiO2 @ ZnO). Using a hydrothermal process, the TiO2@ZnO nanocomposite (NC) was changed via wreathing cadmium sulphide nanoparticles (CdS NPs) (TiO2@ZnO–CdS). Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDAX) were employed to investigate the TiO2@ZnO–CdS NC. The CdS NPs are uniformly distributed over the TiO2@ZnO NC. According to FESEM analysis. TiO2@ZnO–CdS NC is used to detect imidazole at low concentrations and assess cytotoxicity. The TiO2@ZnO–CdS NC has been found to have the best electrochemical sensing activity and considerable cytotoxicity against A549 lung cancer cells.

show abstract

Section: Surface Morphology Investigationmentioning

confidence: 94%

TiO2@ZnO–CdS Nanocomposites for Sensing and Cytotoxicity Applications

C.¹,

Pragathiswaran²,

Balakrishnan³

et al. 2022

IJZI

View full text Add to dashboard Cite

show abstract

“…In spite of much research on the effect of ZnO materials that have been explored for the removal of organic pollutants, the significant disadvantage of ZnO materials is the broadband gap and quick recombination of electron‐hole pairs, hindering its photocatalytic efficiency and restricting its widespread use in the industry [13] . Therefore, various attempt has been concerned at synthesizing a modified ZnO photocatalyst via replacement of metal or non‐metal ions, [5,6,8,10] combination with another semiconductor, [14–16] and deposition of noble metals on the surface [16–18] . Recently, the deposition of noble metals (Ag, Au, etc.)…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of ZnO/Ag Nanostructure with Enhanced Photocatalytic Activity

et al. 2023

View full text Add to dashboard Cite

A series of x%Ag/ZnO (x: 0; 1; 2; 5; 10) nanostructures were successfully synthesized through the facile method. The material's structures were confirmed through X‐ray diffraction, while their morphology, elemental distribution, and components were analyzed using cross‐sectional transmission electron microscopy (XTEM), Field‐emission scanning electron microscopy (FESEM). The optical properties of Ag/ZnO revealed a decrease in band gap from 3.2 eV to 2.83 eV and a significant reduction in photoluminescence intensity with increasing Ag nanoparticle loading on the surface of ZnO. The photocatalytic activity of synthesized Ag/ZnO flower‐like nanostructure was evaluated in the photodegradation of methylene blue (MB) under UV‐Vis irradiation. The photocatalytic results indicated that decorating Ag nanoparticles on the surface of ZnO improved the photodegradation of MB. Interestingly, the 5%Ag/ZnO showed the highest effectiveness, achieving a 99% removal efficiency of MB for 60 minutes under UV‐Vis irradiation. Notably, the ultra performance liquid chromatography‐ tandem mass spectroscopy (UPLC‐MS/MS) confirmed the structure of intermediates, while total organic carbon (TOC) removal was 47%. Moreover, the proposed mechanism for the charge transfer process was based on the results of radical scavenging experiments, which showed that superoxide was the dominant reactive species. Finally, the 5%Ag/ZnO was stable and reused at least five times.

show abstract

“…Nevertheless, low sunlight performance and occurrence of the photo-corrosion are the main drawbacks influencing the practical application of ZnO [ 27 ]. According to the literatures, ZnO was synthesized by various routes [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. Among these techniques, a chemical precipitation method has been used to prepare the semiconducting nanomaterials, which have the benefits of being inexpensive, simple, and easy to control [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…In principle, the UV-active ZnO photocatalyst faces the problem of low performance due to low electron-hole separation efficiency. Both doping/decorating of the metal or creating a heterostructure has been used to improve the performance of the bare ZnO [ 9 , 18 , 19 , 20 , 25 , 26 , 27 , 33 , 34 , 35 ]. Interestingly, after well dispersion of the selected noble metals on ZnO, an increase of the visible light absorption is expected.…”

Section: Introductionmentioning

confidence: 99%

“…Synthesis of various metal-decorated semiconductors has been demonstrated [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. The Ag/ZnO photocatalyst provides an enhanced photocatalytic performance compared to the bare ZnO, due to a dramatic increase of charge carries separation rate at the interface [ 9 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ]. Silver/ZnO photocatalysts have been prepared by using numerous methods [ 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ag-Modified ZnO for Degradation of Oxytetracycline Antibiotic and Reactive Red Azo Dye

et al. 2022

View full text Add to dashboard Cite

It is known that low electron-hole separation efficiency is the major disadvantage influencing low photoactivity of the UV-active ZnO photocatalyst. To solve this drawback, the excellent fabrication technique has been used to disperse silver metal on ZnO surface. In this study, an addition of silver content up to 15 wt% was carried out. The 5Ag-ZnO sample, comprising 5 wt% of silver metal, displayed a hexagonal wurtzite structure, and a band gap of 3.00 eV, with high sunlight-active photocatalytic performance of 99–100% and low photo-corrosion problem. The complete degradation of oxytetracycline (OTC) antibiotic and reactive red dye 141 (RR141) dye under natural sunlight was achieved. The highest rate constant of 0.061 min−1 was detected. The enhancement of the performance is mainly due to lowering of the electron-hole recombination rate. Dispersion of silver on ZnO causes the generation of the Schottky barrier at the interface between Ag and ZnO, so that improvement of quantum efficiency and enhancement of the resultant photoactivity could be expected. Furthermore, good distribution of metallic silver also causes a red shift in absorption of light toward the visible spectrum. This is strongly attributed to the surface plasmon resonance effect, which occurred after successful decoration of the noble metal on ZnO. The photocatalyst, with great structural stability, still maintains high photocatalytic efficiency even after five times of use, implying its excellent cycling ability. The present finding offers a new road to generate a silver decorated ZnO photocatalyst for the complete removal of dye and antibiotics contaminated in the environment.

show abstract

Bio-approach ZnO/Ag nano-flowers: enhanced photocatalytic and photoexcited anti-microbial activities towards pathogenic bacteria

Cited by 11 publications

References 83 publications

TiO2@ZnO–CdS Nanocomposites for Sensing and Cytotoxicity Applications

TiO2@ZnO–CdS Nanocomposites for Sensing and Cytotoxicity Applications

Facile Synthesis of ZnO/Ag Nanostructure with Enhanced Photocatalytic Activity

Ag-Modified ZnO for Degradation of Oxytetracycline Antibiotic and Reactive Red Azo Dye

Contact Info

Product

Resources

About