H2 production by the water splitting reaction using photocatalysts derived from calcined ZnAl LDH

Suárez-Quezada, M.; Romero-Ortiz, Guadalupe; Samaniego-Benítez, J. Enrique; Suárez, Víctor; Mantilla, A.

doi:10.1016/j.fuel.2018.11.155

Cited by 50 publications

(13 citation statements)

References 40 publications

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“…To explain the photocatalytic behavior of the samples, the band position diagram was constructed using the absolute electronegativity of Mulliken 48 , 49 ( Figure 8 ) and the band gap energy values calculated by UV spectroscopy ( Figure 5 ). The conduction band (CB) and valence band (VB) edges were calculated using the following equations where E CB and E VB are the edge potentials of the CB and VB, respectively, X is the geometric mean of the Mulliken’s electronegativities of the constituent atoms, E e is the energy of free electrons on the hydrogen scale (4.5 eV vs normal hydrogen electrode (NHE)), and E g is the band gap energy of the sample.…”

Section: Resultsmentioning

confidence: 99%

Transformation of Nanostructures Cu₂O to Cu₃Se₂ through Different Routes and the Effect on Photocatalytic Properties

et al. 2020

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In this work, copper selenide (Cu 3 Se 2 umangite phase) was synthesized by two routes, using a chemical reaction and the hydrothermal method to obtain CuSe-A and CuSe-H, respectively. The synthesis of Cu 3 Se 2 consisted of a three-step process: in the first step, copper(I) oxide hexapods (Cu 2 O) were obtained as the copper reservoir; in the second step, selenium ions were obtained from the reduction of selenium powder; and in the third step involves mixing two precursors following the two synthesis routes mentioned before. Analysis of X-ray diffraction and X-ray photoelectron spectroscopy showed the formation of the Cu 3 Se 2 phase by both synthesis routes. On the other hand, using the scanning electron microscopy (SEM) technique, it is observed that the Cu 3 Se 2 sample (CuSe-A) is obtained by exchanging in solution with agitation and that the copper selenium phase grows only on the surface of the hexapods. Meanwhile, the hydrothermal route promotes a total conversion of copper(I) oxide hexapods to the copper selenide phase (CuSe-H). The resulting materials were tested as photocatalytic materials to remove methylene blue dye in water under sunlight irradiation. Cu 3 Se 2 (CuSe-H) obtained by the hydrothermal route exhibited a higher efficiency of photodegradation of dye, reaching a removal percentage of 92% after 4 h under sunlight.

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Section: Resultsmentioning

confidence: 99%

Transformation of Nanostructures Cu₂O to Cu₃Se₂ through Different Routes and the Effect on Photocatalytic Properties

et al. 2020

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“…FePcS-PMA-LDH The molecular structure and chemical nature of ZnAl-LDH, FePcS-LDH, and FePcS-PMA-LDH were analyzed by FTIR spectra, which are shown in Figure 2. In the spectrum of ZnAl-LDH, the characteristic absorption peaks at 3446, 1630, and 1403 cm −1 can be attributed to the O-H stretching vibration of interlayer water molecules, the bending vibration of H 2 O in the brucite-like layer, and the stretching vibration of nitrate, respectively [29][30][31]. Compared to the ZnAl-LDH sample, the FTIR spectra of FePcS-LDH and FePcS-PMA-LDH appeared as a new absorption band at 1120 cm −1 , which was assigned to the stretching vibration absorption of the S=O bond in FePcS [32,33], whereas the infrared absorbance near 647 cm −1 was assigned to the vibration absorption of C-H out-of-plane ring bend on the aromatic ring in FePcS [34].…”

Section: 1064mentioning

confidence: 99%

Synthesis of FePcS–PMA–LDH Cointercalation Composite with Enhanced Visible Light Photo-Fenton Catalytic Activity for BPA Degradation at Circumneutral pH

Huang

Tian

et al. 2020

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1) Background: Iron tetrasulfophthalocyanine with a large nonlinear optical coefficient, good stability, and high catalytic activity has aroused the attention of researchers in the field of photo-Fenton reaction. Further improvement of the visible light photo-Fenton catalytic activity under circumneutral pH conditions for their practical application is still of great importance. (2) Methods: In this paper, iron tetrasulfophthalocyanine (FePcS) and phosphomolybdic acid (PMA) cointercalated layered double hydroxides (LDH) were synthesized by the ion-exchange method. All samples were fully characterized by various techniques and the results showed that FePcS and PMA were successfully intercalated in layered double hydroxides and the resulted compound exhibited strong absorption in the visible light region. The cointercalation compound was tested as a heterogeneous catalyst for the visible light photo-Fenton degradation of bisphenol A (BPA) at circumneutral pH.(3) Results: The results showed that the degradation and total organic carbon removal efficiencies of bisphenol A were 100% and 69.2%, respectively. (4) Conclusions: The cyclic voltammetry and electrochemical impedance spectroscopy measurements demonstrated that the main contribution of PMA to the enhanced photo-Fenton activity of FePcS-PMA-LDH comes from the acceleration of electron transfer in the reaction system. Additionally, the possible reaction mechanism in the photo-Fenton system catalyzed by FePcS-PMA-LDH was also proposed.

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“…A method involving urea hydrolysation is used to prepare ZnM LDHs (Montanari et al, 2010;Teruel et al, 2010;Suárez-Quezada et al, 2019;Sakr et al, 2021). Metal salts are dissolved in urea, which hydrolyses extremely slowly.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the resulting material precipitates slower than that in the coprecipitation method. The main advantage of this method is the considerably easy washing of the prepared LDH during synthesis, since there is no need to remove alkali metal ions, as compared to the use of Na 2 CO 3 or NaOH (Suárez-Quezada et al, 2019). This method can be used to prepare LDHs with a narrow particle distribution and good crystallite size (Liu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of the ZnAl Mixed Oxides Into the Layered Double Hydroxide Catalysts Active in the Aldol Condensation of Furfural: The Role of ZnO Particles

et al. 2022

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A memory effect is the ability to restore the original, lamellar layered double hydroxide structure. Herein, we have described 1) the changes in the structural and basic properties of ZnAl mixed oxides during their transformation into ZnAl-reconstructed LDHs (RE-LDHs); 2) the extraordinary properties of ZnAl RE-LDHs compared to the original ZnAl LDHs; and 3) the changes of basic properties during the interaction of ZnAl RE-LDHs with atmospheric CO2. Aldol condensation was selected as probe reaction to prove the catalytic potential of ZnAl RE-LDHs. We have described a target method for preparing ZnAl RE-LDHs with a large number of basic sites. ZnAl RE-LDHs possess significantly higher furfural conversion in the aldol condensation of furfural than MOs. The structural, textural, and basic properties of the studied materials were described by temperature-programmed analysis, X-ray diffraction, N2 adsorption, temperature-programmed desorption of CO2, and in-situ diffuse reflectance spectroscopy.

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H2 production by the water splitting reaction using photocatalysts derived from calcined ZnAl LDH

Cited by 50 publications

References 40 publications

Transformation of Nanostructures Cu₂O to Cu₃Se₂ through Different Routes and the Effect on Photocatalytic Properties

Transformation of Nanostructures Cu₂O to Cu₃Se₂ through Different Routes and the Effect on Photocatalytic Properties

Synthesis of FePcS–PMA–LDH Cointercalation Composite with Enhanced Visible Light Photo-Fenton Catalytic Activity for BPA Degradation at Circumneutral pH

Reconstruction of the ZnAl Mixed Oxides Into the Layered Double Hydroxide Catalysts Active in the Aldol Condensation of Furfural: The Role of ZnO Particles

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H2 production by the water splitting reaction using photocatalysts derived from calcined ZnAl LDH

Cited by 50 publications

References 40 publications

Transformation of Nanostructures Cu2O to Cu3Se2 through Different Routes and the Effect on Photocatalytic Properties

Transformation of Nanostructures Cu2O to Cu3Se2 through Different Routes and the Effect on Photocatalytic Properties

Synthesis of FePcS–PMA–LDH Cointercalation Composite with Enhanced Visible Light Photo-Fenton Catalytic Activity for BPA Degradation at Circumneutral pH

Reconstruction of the ZnAl Mixed Oxides Into the Layered Double Hydroxide Catalysts Active in the Aldol Condensation of Furfural: The Role of ZnO Particles

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Transformation of Nanostructures Cu₂O to Cu₃Se₂ through Different Routes and the Effect on Photocatalytic Properties

Transformation of Nanostructures Cu₂O to Cu₃Se₂ through Different Routes and the Effect on Photocatalytic Properties