Visible-light Cu/TiO2@Ag3PO4 heterostructure photocatalyst for selective nitrate reduction and antimicrobial activity

Mertah, Oumaima; Hajjaji, K. El; amrani, Soukayna El; Tanji, Karim; Goncharova, I. V.; Kherbeche, Abdelhak

doi:10.1016/j.optmat.2022.112549

Cited by 9 publications

(4 citation statements)

References 60 publications

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“…The addition of a transition metal can result in a shift in the TiO 2 absorption window to the visible region, with the transition metal creating a new energy level between the valence and conduction bands of TiO 2 . Doping with Mn [132], Cr [133], Fe [134][135][136][137][138][139][140], Cu [141][142][143], or V [112] effectively reduces the bandgap of TiO 2 , such that it responses to visible light. The type and amount of dopant ion are important factors that affect the photocatalytic oxidation activity of TiO 2 .…”

Section: Excessive Metal Dopingmentioning

confidence: 99%

Preparation and Photocatalytic Activities of TiO2-Based Composite Catalysts

Yang

Chen

et al. 2022

Catalysts

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While modern industry has contributed to the prosperity of an increasingly urbanized society, it has also led to serious pollution problems, with discharged wastewater and exhaust gases causing significant environmental harm. Titanium dioxide (TiO2), which is an excellent photocatalyst, has received extensive attention because it is inexpensive and able to photocatalytically degrade pollutants in an environmentally friendly manner. TiO2 has many advantages, including high chemical stability, low toxicity, low operating costs, and environmental friendliness. TiO2 is an N-order semiconductor material with a bandgap of 3.2 eV. Only when the wavelength of ultraviolet light is less than or equal to 387.5 nm can the valence band electrons obtain the energy of the photons and pass through the conduction band and form photoelectrons, while the valence band, correspondingly, forms photogenerated holes, and light in other areas will not be generated. The most common methods used to improve the photocatalytic efficiency of TiO2 involve increasing its photoresponse range and reducing photogenerated-carrier coupling. The morphology, size, and structure of a heterojunction can be altered through element doping, leading to improved photocatalytic efficiency. Mainstream methods for preparing TiO2 are reviewed in this paper, with several excellent preparation schemes for improving the photocatalytic efficiency of TiO2 introduced. TiO2 is mainly prepared using sol-gel, solvothermal, hydrothermal, anodic oxidation, microwave-assisted, CVD and PVD methods, and TiO2 nanoparticles with excellent photocatalytic properties can also be prepared. Ti-containing materials are widely used to purify harmful gases, as well as contaminants from building materials, coatings, and daily necessities. Therefore, the preparation and applications of titanium materials have become globally popular research topics.

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Section: Excessive Metal Dopingmentioning

confidence: 99%

Preparation and Photocatalytic Activities of TiO2-Based Composite Catalysts

Yang

Chen

et al. 2022

Catalysts

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“…26 However, the physicochemical characteristics of the different semiconductors lead to specific applications due to properties of these materials', mainly the optical, textural, and semiconductor properties. 17,25,27−29 In the study reported by Mertah et al, 30 the antimicrobial and photocatalytic properties of Cu/TiO 2 /Ag 3 PO 4 heterojunction have been investigated, obtaining promising results in the selective reduction of nitrates as well as inhibition of bacterial strains Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). Michele et al 23 also reported the antimicrobial properties of heterojunction Ag/Ag 3 PO 4 in their study, decorated in hydroxyapatite and calcium carbonate matrices, resulting in the synergistic effect for the inhibition of bacterial growth of the strains S. aureus and Pseudomonas aeruginosa (P. aeruginosa).…”

Section: Introductionmentioning

confidence: 99%

“…Among the synthesis methods commonly employed, it is possible to highlight the chemical methods in an aqueous medium based on different precursors of silver ions and phosphorus ions. Thus, the use of chemical route such as hydrothermal, 25 solvothermal, 43 microwave, 32 sol−gel, 30 and sonochemistry 24 methods are classically described in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Solvent Effect on the Structural, Optical, Morphology, and Antimicrobial Activity of Silver Phosphate Microcrystals by Conventional Hydrothermal Method

Takeno,

Nobre,

da Costa

et al. 2024

ACS Omega

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The design of particle size and morphology are a promising approach to investigating the properties exhibited by different types of materials. In the present study, the silver phosphate microcrystals (Ag3PO4) were first time synthesized using the hydrothermal and solvothermal method by combination of the solvents water/isopropyl alcohol (SP-IA), water/acetone (SP-AC), water/ammonium hydroxide (AP-AH), all in a ratio of 1:1 (v/v). The synthesized materials were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, and Raman vibrational spectroscopy, where it was confirmed that the pure phase was achieved for all prepared samples. The study of the optical properties by UV–vis diffuse reflectance spectroscopy (UV–vis/DRS) and colorimetry revealed that the obtained materials have an optical bandgap between 2.30 and 2.32 eV. The FE-SEM images collected revealed different morphologies for the synthesized materials, with a predominance of tetraploid-shaped microcrystals for the SP-AC sample, rods for the SP-IA sample, cubes and polyhedral for the SP-WT sample and condensed polyhedral for the SP-AH sample. The photocatalytic performance against the Rhodamine B dye (RhB) was 100%, 98.2%, 94.2%, and 87.8%, using the samples SP-AC, SP-IA, SP-WT, and SP-AH as photocatalyst at time of 12 min. On the other hand, the antimicrobial performance of SP-AC sample showed superior performance, resulting in the minimum inhibitory concentrationMIC of 7.81 μg mL–1 for the strain of E. coli, 7.81 μg mL–1 for the strain of E. aureus, 15.62 μg mL–1 for the strain of P. auruginosa, and 15.62 μg mL–1 for the strains of C. albicans. In this way, was synthesized a promissory antimicrobial and photocatalyst material, through an easy and cost-effective method.

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