In Situ Real Time Infrared Spectroscopy of Sorption of (Poly)molybdate Ions into Layered Double Hydroxides

Davantès, A.; Lefèvre, Grégory

doi:10.1021/jp408885k

Cited by 41 publications

(48 citation statements)

References 50 publications

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“…In Table 2, the decomposition results along with data in the literature and sorption results of heptamolybdate ions in this LDH from our previous study are presented. 40 Del Arca et al 36 Others have studied various tungsten polyoxometalate ions sorbed in different LDH including the paratungstate A. 38 George et al 72 have recorded the IR spectrum of the paratungstate B, and Courcot and Bridgeman 58 have calculated the W 7 O 24 6− spectra in the gas phase.…”

Section: Resultsmentioning

confidence: 99%

Infrared Study of (Poly)tungstate Ions in Solution and Sorbed into Layered Double Hydroxides: Vibrational Calculations and In Situ Analysis

2015

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In situ attenuated total reflection infrared spectroscopy (ATR-FTIR) was used to study the speciation of (poly)tungstate ions in solution and the sorption process into layered double hydroxides (LDHs). In the first section, the W(VI) speciation in solution was performed by comparison of thermodynamical calculations and infrared spectroscopy of solutions as a function of pH. Then, the exchange mechanism within LDHs was followed in real time with the in situ ATR technique and compared with batch experiments characterized by powder X-ray diffraction (PXRD), elemental analysis, and FTIR. Decomposition of the (W−O) stretching vibration bands, between 800 and 1000 cm −1 , has allowed the identification of the high affinity of LDHs for the polytungstate species, W 7 O 24 6− , despite the presence of carbonate ions and higher charged polytungstate ions in solution. This was confirmed by the DFT methods used to investigate the structure and the vibrational modes of this anion, and very good agreement with experimental spectra has been obtained. The affinity series W 7 O 24 6− > CO 3 2− > WO 4 2− > SO 4 2− has been directly deduced from those results.

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Section: Resultsmentioning

confidence: 99%

Infrared Study of (Poly)tungstate Ions in Solution and Sorbed into Layered Double Hydroxides: Vibrational Calculations and In Situ Analysis

2015

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“…Based on the XRD results, Davantes et al [68] were able to create a representative scheme that describes the interlayer exchange of different anions (Figure 9). The affinity series decreases in the order [Mo7O24] 6− > CO3 2− > [MoO4] 2− > SO4 2− [60]. The diffraction patterns of the Mo-intercalated samples that were obtained by Carriazo et al [69] are characteristic to hydrotalcite-like structure, indicating a rhombohedral packing of the layers.…”

Section: Molybdatesmentioning

confidence: 91%

“…Apart from the crucial role in the conventional catalysis, Mo-containing LDH can also be used as photocatalyst for electrocatalytic water oxidation [84], as adsorbent [60,69,89], or as an anti-corrosion material [78,88].…”

Section: Molybdatesmentioning

confidence: 99%

Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

et al. 2020

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Layered double hydroxides (LDH) are an extended class of two-dimensional anionic materials that are known for their unique lamellar structure, versatile composition, and tunable properties. The layered architecture allows the intercalation between the positively charged sheets of a vast variety of anionic species, including oxometalates and polyoxometalates (POM). The hybrid composites that were developed using POM and LDH show great advantages when compared to both parent materials causing the appearance of new functionalities, which may lead to remarkable contributions in many areas of application, especially in catalysis. The current review paper emphases all of the crucial works already existing in literature that are related to the large group of POM-LDH solids and their use as catalysts for fine organic synthesis. The new trends in the development of the POM-LDH catalysts are highlighted based on the overview of 121 scientific articles that were published between 1984 and 2019. The main topics are focused primarily on the synthesis, characterization, and the catalytic applications of different LDH systems hosting polyoxometalates with low, medium, and high nuclearity. The intense exploration of the POM-LDH field has led to the obtaining of countless effective catalysts used in various types of reactions, from condensation, esterification, halodecarboxylation, to oxidation and epoxidation.

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“…Furthermore, the band at ν̃ = 665 cm –1 is attributed to Mo–O–Mo stretching vibration. The band at ν̃ = 856 cm –1 is related to MoO 4 2– anions, and the band at ν̃ = 914 cm –1 is attributed to Mo=O stretching , …”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Activity of a Molybdate‐Intercalated Iron‐Based Layered Double Hydroxide

et al. 2017

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Herein, we report the design and successful fabrication of new Mg/Fe layered double hydroxides (LDHs) with different Mg/Fe molar ratios (2:1, 3:1, and 4:1) by a coprecipitation method. The prepared Mg/Fe (4:1) LDH sample with high crystallinity and phase purity was further modified by intercalation with molybdate anions. The structural, morphological, optical, electrochemical, and photocatalytic properties of the prepared catalysts were subsequently examined. In comparison with that of the Mg/Fe (4:1) LDH, the photocatalytic activity of the Mg/Fe (4:1) material with molybdate anions intercalated in the interlayer for the degradation of methyl orange (MO) was enhanced, and the processed followed apparent first-order kinet-[aScheme 2. Schematic representation of the detailed interaction of the dye with the LDH and the degradation mechanism over Mg/Fe-4/Mo LDH.

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In Situ Real Time Infrared Spectroscopy of Sorption of (Poly)molybdate Ions into Layered Double Hydroxides

Cited by 41 publications

References 50 publications

Infrared Study of (Poly)tungstate Ions in Solution and Sorbed into Layered Double Hydroxides: Vibrational Calculations and In Situ Analysis

Infrared Study of (Poly)tungstate Ions in Solution and Sorbed into Layered Double Hydroxides: Vibrational Calculations and In Situ Analysis

Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

Enhanced Photocatalytic Activity of a Molybdate‐Intercalated Iron‐Based Layered Double Hydroxide

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