Preparation of calcined hydrotalcite/TiO2-Ag composite and enhanced photocatalytic properties

Almeida, Marciano Fabiano de; Bellato, Carlos Roberto; Miranda, Liany Divina Lima; Milagres, Jaderson L.

doi:10.1016/j.ceramint.2016.10.143

Cited by 22 publications

(4 citation statements)

References 70 publications

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“…The suspensions were stirred to achieve an absorption-desorption equilibrium state for the solution which was required to be kept in the dark before light irradiation. 36,37 The reaction mixture was irradiated with stirring under the xenon lamp positioned at 21 cm above the reaction mixture. A blank experiment was executed either in the absence of sample (photocatalyst) or in the dark to determine that degradation of MB is truly operated by a photocatalytic mechanism.…”

Section: Photocatalytic Studiesmentioning

confidence: 99%

Synergetic effect of CuS@ZnS nanostructures on photocatalytic degradation of organic pollutant under visible light irradiation

et al. 2017

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Ultrafast visible light active CuS/ZnS nanostructured photocatalysts were synthesized by a hydrothermal method. The effect of the CuS concentration on the morphological, structural and optical properties of ZnS nanostructures were investigated. X-ray diffraction analysis indicated the formation of CuS/ZnS phases with good crystallinity. The presence of ZnS on CuS was confirmed by X-ray photoelectron spectroscopy, elemental mapping, scanning electron microscopy and high resolution transmission electron microscopy analyses. CuS/ZnS nanocomposites efficiently decomposed methylene blue (MB) upon irradiation with visible light. The degradation time was 3 times faster than that of bare ZnS and CuS.The scavenger analysis results revealed that photogenerated superoxide (O 2 À c) radicals were the main reactive species for the degradation of MB. The maximum degradation efficiency of 95.51% was observed within 5 min for samples of 0.050 M CuS/ZnS composites. The obtained results suggested that the enhanced photocatalytic activity was due to the formation of CuS/ZnS heterojunctions which led to the efficient separation of the photoinduced carriers.

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Section: Photocatalytic Studiesmentioning

confidence: 99%

Synergetic effect of CuS@ZnS nanostructures on photocatalytic degradation of organic pollutant under visible light irradiation

et al. 2017

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“…It implied that a great majority of transferred electrons were trapped due to the strong electron accepting ability of metallic Ag, resulting in an effective separation of the electrons and holes. However, excessive Ag nanoparticle not only acted as an electron-hole recombination center, but also blocked partial UV-light that could reach the surface of TiO 2 59 , 60 , which further decreased its photocatalytic activity. Thus, Ag(1%)-TiO 2 /H 3 PW 12 O 40 (10%) represented the maximum photoactivity, and was selected in subsequent photocatalytic experiments.…”

Section: Resultsmentioning

confidence: 99%

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Lü

Wang

Ning

et al. 2017

Sci Rep

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A series of plasmonic Ag-TiO2/H3PW12O40 composite films were fabricated and immobilized by validated preparation technique. The chemical composition and phase, optical, SPR effect and pore-structure properties together with the morphology of as-prepared composite film are well-characterized. The multi-synergies of as-prepared composite films were gained by combined action of electron-capture action via H3PW12O40, visible-response induced by Ag, and Schottky-junction formed between TiO2-Ag. Under simulated sunlight, the maximal K app of o-chlorophenol (o-CP) reached 0.0075 min−1 which was 3.95-fold larger than that of TiO2 film, while it was restrained obviously under acid condition. In the photocatalytic degradation process, ·OH and ·O2 − attacked preferentially ortho and para position of o-CP molecule, and accordingly the specific degradation pathways were speculated. The novel composite film exhibited an excellent applicability due to self-regeneration of H3PW12O40, well-protection of metal Ag° and favorable immobilization.

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“…[39] Oxalic acid or sodium borohydride has been used as reducing agents for the decoration of AgNPs on carriers. [40] Following the green and sustainable chemistry trend, Chamanmalik et al decorated Ag NPs on HT MgÀ Al using Tectona grandis leaves extract to assist in the Ag(I) ion reduction process. The HTÀ Ag nanoparticles are spherical in shape and effectively inhibit the growth of E. coli and B. cereus.…”

Section: Introductionmentioning

confidence: 99%

“…HT Mg/Al‐supported Ag NPs catalysts were synthesized through a reduction reaction with hydrogen gas at 110 °C for 30 minutes [39] . Oxalic acid or sodium borohydride has been used as reducing agents for the decoration of AgNPs on carriers [40] . Following the green and sustainable chemistry trend, Chamanmalik et al .…”

Section: Introductionmentioning

confidence: 99%

Bio‐Synthesis of Silver Nanoparticles Decorated on Hydrotalcite using Psidium Guajava Leaf Extract and Its Anti‐Bacterial Effect

Dam,

Nguyen,

Nguyen

et al. 2024

ChemistrySelect

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Phenolic compounds are widely known for its well‐reduced behavior and surprisingly appeared in many leaf extracts, including Psidium guajava (P. guajava) leaf. This leaf extract has been confirmed as an efficiency reducing agent to reduce Ag(I) ions to silver nanoparticles (AgNPs). This work focused on the development of a “green” synthesis of nanosilver‐hydrotalcite nanoparticles (HT‐AgNPs) based on the bio‐reduction of the P. guajava leaf extract and the application of HT‐AgNPs as an antibacterial material. To assess factors affecting on synthesis process of the HT‐AgNPs, experiments have been carried out with a fixation of HT/AgNO3 precursors while varying concentration of P. guajava leaf extract as well as solvent for the extraction. The methods, including ultraviolet‐visible (UV‐Vis) spectroscopy, infrared (IR) spectroscopy, field emission scanning electron microscopy (FESEM), dynamic light scattering (DLS), X‐ray diffraction (XRD) and energy dispersive X‐Ray (EDX), transmission electron microscopy (TEM) have been used to characterize the HT‐AgNPs. The yield of reduction process of Ag(I) ions to AgNPs on HT reached 55.12 to 90.55 % depending on the content of AgNO3 precursor. In particular, the antibacterial activity of HT‐AgNPs against to E. coli and S. aureus was also assessed and discussed.

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Preparation of calcined hydrotalcite/TiO2-Ag composite and enhanced photocatalytic properties

Cited by 22 publications

References 70 publications

Synergetic effect of CuS@ZnS nanostructures on photocatalytic degradation of organic pollutant under visible light irradiation

Synergetic effect of CuS@ZnS nanostructures on photocatalytic degradation of organic pollutant under visible light irradiation

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Bio‐Synthesis of Silver Nanoparticles Decorated on Hydrotalcite using Psidium Guajava Leaf Extract and Its Anti‐Bacterial Effect

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