Plasmonic photocatalysts based on silver nanoparticles – layered double hydroxides for efficient removal of toxic compounds using solar light

Gilea, Diana; Radu, Teodora; Muresanu, Mihaela; Cârjă, Gabriela

doi:10.1016/j.apsusc.2018.03.054

Cited by 25 publications

(12 citation statements)

References 37 publications

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“…The XRD patterns of the samples, displayed in Figure 1, confirm that the layered structure of the solids was achieved during the synthesis for all reaction systems containing organic solvents (ethanol, ethyl acetate, glycerol and toluene). The planes indexation (Table 1) indicate that the double layered structure is confirmed, since the main planes characteristic to LDHs were found for all samples, but the structures are largely distorted in comparison with samples having similar network composition, prepared in aqueous medium only [13]. The structural details presented in Figure 1 and Table 1 indicate that the use of organic solvents generates powder diffraction patterns with rough baseline and low intensity, wide peaks, characteristic to the presence of large ratios of amorphous solid.…”

Section: Structural Characterizationmentioning

confidence: 79%

Fabrication of Zinc-Iron-Aluminum Layered Double Hydroxides with Controlled Micromorphology in a Tailored Aqueous - Organic Synthesis Medium

Stanciulescu¹,

Cârjă²,

Lutic³

2020

Rev. Chim.

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Micromorphology characteristics of layered double hydroxides are important to establish their performances to act as adsorbents and catalysts/photocatalysts. Herein, we report the fabrication of ZnFeAl layered double hydroxides (LDHs) (defined by a molar ratios Zn/Fe/Al 2/0.5/0.5), in a tailored aqueous-organic synthesis medium, by using the coprecipitation method. The nature of the organic solvent (e.g.: ethanol, ethyl acetate, glycerol and toluene) was used as a controlled variable for obtaining specific morphology characteristics of ZnFeAl. XRD, FTIR, UV-Vis-DR spectroscopy and SEM microscopy have been used to characterize the structural, optical and textural features of ZnFeAl. Results show that the controlled aqueous-organic synthesis medium established important changes in the structural features and the micromorphology characteristics (e.g.: particle sizes and their interconnection patterns) of ZnFeAl, as indicated by the results of XRD and SEM analyses. The FTIR spectra revealed that most of the interlayer anions are carbonate, even though the initial salts precursors contain nitrates or sulfates anions. Furthermore, the UV-Vis-DR results underline that the band gaps of the LDH derived oxides changed in a significant manner, as a function of the nature of the organic solvent. Such that, ZnFeAl prepared in the presence of ethanol and ethyl acetate show band gap values lower than 3 eV and thus could be better activated under visible light. These results should be inspiring for fabricating layered double hydroxides with a controlled micromorphology for specific applications for environmental cleanup.

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Section: Structural Characterizationmentioning

confidence: 79%

Fabrication of Zinc-Iron-Aluminum Layered Double Hydroxides with Controlled Micromorphology in a Tailored Aqueous - Organic Synthesis Medium

Stanciulescu¹,

Cârjă²,

Lutic³

2020

Rev. Chim.

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“…Following the degradation process, releasing CO 2 and H 2 O, formic acid and oxalic acid are formed as final mineralization products. The hypochromic effect broadens and shifts the absorption profile from 270 nm to a bit of 265 nm, indicating the formation of muconic acid [ 55 ]. Otherwise, molecular oxygen can scavenge photogenerated conduction band electrons to form superoxide anion radicals .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of silver nanoparticles using bio valorization coffee waste extract: photocatalytic flow-rate performance, antibacterial activity, and electrochemical investigation

El-Desouky

Shoueir

El‐Mehasseb

et al. 2022

Biomass Conv. Bioref.

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It is well known that biogenic synthesis, as compared to other processes, has proven to be highly effective in the fabrication of silver nanoparticles (AgNPs). Thus, our current study focused on synthesizing AgNPs using coffee waste extract (CWE). CWE contains many compounds identified by HPLC, which reduce, cap, and stabilize AgNPs in its solution. The as-synthesized AgNPs were produced with a monodispersed small size around 20 nm and exhibited in-plane dipole plasmon resonances of hexagonal nanoplates. AgNPs were characterized by both physical and spectroscopic methods, which confirmed their nanoscale dimensions with a hexagonal shape. The as-prepared AgNPs (12 mg) enabled the photodegradation of phenol compounds (20 mL) with a removal efficiency of ~ 94.6% in a short time in the presence of citric acid. Additionally, the second promising application of AgNPs was the tendency to remove the hazard 2,4 dinitroaniline (2,4 DNA) with a percent more than 97% while using only 7 mg of AgNPs. Moreover, the green synthesized AgNPs are superior in inhibiting bacterial growth and killing most infected microbes such as B. subtilis , P. aeruginosa , S. aureus , and E. coli . The electrochemical characteristics of the AgNPs were evaluated using a three-electrode system. The calculated specific capacitance was 280 F g −1 at 0.56 A g −1 . Furthermore, after 1000 cycles at 2.2 A g −1 , the AgNPs electrode demonstrates an excellent cycling stability behavior with 94.8% capacitance retention. Based on the previous promising results, it can be concluded that CWE is an environmentally benign extract to prepare AgNPs with low cost, saving and easily used for many great domains in photocatalytic, phenol compound removals, and production of functional nanodevices.

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“…ZnMe (Me: Co; Ga; Al) LDHs were prepared via the co-precipitation method [17][18][19] at 65 °C and a constant pH of 9 [15,16]. ZnAl LDHs, molar ratio of Zn 2+ /Al 3+ = 2/1 and 3/1, were obtained by the slow addition of an aqueous solution of Zn(NO 3 ) 2 •6H 2 O and Al(NO 3 ) 3 •9H 2 O to an aqueous solution of NaOH/Na 2 CO 3 and denoted as ZnAl 2 and ZnAl 3 , respectively.…”

Section: Preparation Of Photocatalystsmentioning

confidence: 99%

“…ZnAl 2 O 4 , (@) CoAl 2 O 4 , ( * ) ZnGa 2 O 4 and ( ∧ ) ZnO are clearly assessed. DRIFT results (see Figure S3) show that all the LDHs-like catalysts have CO 2− 3 as anions in the interlayers with the intense vibration band at 1360 cm −1 and less intense vibration band at 1510 cm −1 , corresponding to the CO 2− 3 symmetric and antisymmetric bending vibrations, respectively [16]. The broad absorption band, which may be associated to the O-H stretching of the hydroxyl groups from the brucite-like layers and physisorbed interlamellar water [17] is clearly observed within (3000-3500) cm −1 .…”

Section: Characterization Of the Photocatalystsmentioning

confidence: 99%

“…However, considering the low concentrations, the unknown chemical structure and fast transformation of intermediates, the accurate identification of degradation products is, certainly, a highly challenging task [8,9]. Our previous work demonstrated that 2-D matrices of layered double hydroxides (LDHs) and their derived oxides can be designed as successful photocatalysts for the removal of toxic pollutants [15,16]. LDHs are a class of anionic clays with formula as [M(II…”

Section: Introductionmentioning

confidence: 99%

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Efficient degradation and mineralization of diclofenac in water on ZnMe (Me: Al; Co; Ga) layered double hydroxides and derived mixed oxides as novel photocatalysts

Grosu¹,

Seftel²,

Cuykx³

et al. 2022

Comptes Rendus. Chimie

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Plasmonic photocatalysts based on silver nanoparticles – layered double hydroxides for efficient removal of toxic compounds using solar light

Cited by 25 publications

References 37 publications

Fabrication of Zinc-Iron-Aluminum Layered Double Hydroxides with Controlled Micromorphology in a Tailored Aqueous - Organic Synthesis Medium

Fabrication of Zinc-Iron-Aluminum Layered Double Hydroxides with Controlled Micromorphology in a Tailored Aqueous - Organic Synthesis Medium

Synthesis of silver nanoparticles using bio valorization coffee waste extract: photocatalytic flow-rate performance, antibacterial activity, and electrochemical investigation

Efficient degradation and mineralization of diclofenac in water on ZnMe (Me: Al; Co; Ga) layered double hydroxides and derived mixed oxides as novel photocatalysts

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