Green synthetic methodology: An evaluative study for impact of surface basicity of MnO2 doped MgO nanocomposites in Wittig reaction

Moulavi, Mansur; Kale, Bharat B.; Bankar, Digambar B.; Amalnerkar, Dinesh; Vinu, Ajayan; Kanade, K.G.

doi:10.1016/j.jssc.2018.09.028

Cited by 9 publications

(5 citation statements)

References 33 publications

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“…Surface basicity is an important surface property that could affect the catalytic process. − It could promote many kinds of reactions via the activation of O–H and N–H bonds , etc. Recent reports showed that the base could help in the activation of C–H bonds. , Although a great amount of research on the base-catalyzed depolymerization (BCD) of lignin has been reported, most of the reports have focused on the stoichiometric amount of the base at harsh temperatures of 270–330 °C and very high pressures. ,− In addition, Yan, Sels, and Song reported the influence of NaOH or Cs 2 CO 3 additives in the reaction medium on the metal-catalyzed hydrogenolysis processing of lignin.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activation of Carbon–Hydrogen Bonds in Lignin Linkages over Strong-Base-Modified Covalent Triazine Frameworks for Lignin Oxidative Cleavage

et al. 2020

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The design of highly efficient catalysts for the cleavage of various lignin linkages is the key step in the depolymerization of lignin. In this paper, strong-base-modified covalent triazine frameworks (CTFs) were reported to be effective in the cleavage of the β-O-4 linkage. With the modification, the cleavage rate of the β-O-4 linkage was enhanced remarkably. Insight into the catalytic mechanism illustrated that the strong basic sites assisted the activation of Cβ–H bonds, which accounted for the promotion effect. The catalyst was further applied to the depolymerization of organosolv lignin, which showed 87% conversion of the β-O-4 linkage. This strategy should be useful in the catalyst design for lignin depolymerization.

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Section: Introductionmentioning

confidence: 99%

Catalytic Activation of Carbon–Hydrogen Bonds in Lignin Linkages over Strong-Base-Modified Covalent Triazine Frameworks for Lignin Oxidative Cleavage

et al. 2020

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“…Nevertheless, the diffractogram peaks of the oxide synthesized with starch fuel (MgO-St) showed larger (57% wider, approx.) widths at their average height compared to the peaks of the MgO-CP and MgO-Av diffractograms, suggesting a smaller crystallite size [ 27 , 28 ].…”

Section: Resultsmentioning

confidence: 99%

Eco-Friendly Polysaccharide-Based Synthesis of Nanostructured MgO: Application in the Removal of Cu2+ in Wastewater

et al. 2023

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The present study described three synthesis routes using different natural polysaccharides as low-cost non-toxic fuels and complexing agents for obtaining MgO. Cassava starch, Aloe vera leaves (mainly acemannan) gel, and citric pectin powder were mixed with magnesium nitrate salt and calcined at 750 °C for 2 h. The samples were named according to the polysaccharide: cassava starch (MgO-St), citrus pectin (MgO-CP), and Aloe vera (MgO-Av). X-ray diffraction identified the formation of a monophasic periclase structure (FCC type) for the three samples. The N2 adsorption/desorption isotherms (B.E.T. method) showed an important difference in textural properties, with a higher pore volume (Vmax = 89.76 cc/g) and higher surface area (SA = 43.93 m2/g) obtained for MgO-St, followed by MgO-CP (Vmax = 11.01 cc/g; SA = 7.01 m2/g) and MgO-Av (Vmax = 6.44 cc/g; SA = 6.63 m2/g). These data were consistent with the porous appearance observed in SEM images. Porous solids are interesting as adsorbents for removing metallic and molecular ions from wastewater. The removal of copper ions from water was evaluated, and the experimental data at equilibrium were adjusted according to the Freundlich, Langmuir, and Temkin isotherms. According to the Langmuir model, the maximum adsorption capacity (qmax) was 6331.117, 5831.244, and 6726.623 mg·g−1 for the adsorbents MgO-St, MgO-Av, and MgO-CP, respectively. The results of the adsorption isotherms indicated that the synthesized magnesium oxides could be used to decrease the amount of Cu2+ ions in wastewater.

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“…The other peaks with values of 36.7° (111); 62.2° (220); 74.5° (311); and 78.4° (222). In the Cm-MgO (Figure 1b) diffractogram, a secondary phase was identified at 18.28° (001); 37.66° (101); 50.76° (102); and 58.50° (110) planes, associated with the brucite phase (Mg(OH)2) (ICSD: 34401), a hexagonal phase in the cubic structure of MgO, possibly generated by the hydration of the oxide by the humidity in the environment [22].…”

Section: Crystallographic Phase By X-ray Diffractometry (Xrd) Before ...mentioning

confidence: 99%

“…However, for the Cm-MgO sample (89.7%), a larger average crystallite size (18.11 nm) was obtained, around 26.5% larger than that of the St-MgO sample, which shows the formation of larger particles, due to the possible use of higher temperatures in the formation of the commercial oxide, favoring the sintering of the particles [23]. In the Cm-MgO (Figure 1b) diffractogram, a secondary phase was identified at 18.28 • (001); 37.66 • (101); 50.76 • (102); and 58.50 • (110) planes, associated with the brucite phase (Mg(OH) 2 ) (ICSD: 34401), a hexagonal phase in the cubic structure of MgO, possibly generated by the hydration of the oxide by the humidity in the environment [22].…”

Section: Crystallographic Phase By X-ray Diffractometry (Xrd) Before ...mentioning

confidence: 99%

Synthesis of Periclase Phase (MgO) from Colloidal Cassava Starch Suspension, Dual Application: Cr(III) Removal and Pigment Reuse

Balaba,

Primo,

Sotiles

et al. 2024

Physchem

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This study aimed to synthesize magnesium oxide (MgO) using a colloidal starch method for two primary purposes: the removal of chromium (III) ions from synthetic wastewater and the subsequent use of the chromium-containing material as synthetic inorganic pigments (SIPs) in commercial paints. The synthesis used to obtain the oxide (St-MgO) is a promising method for using plants, such as cassava, as green fuels due to their abundance, low cost, and non-toxicity. With this, the oxide showed greater porosity and alkalinity, compared to commercial magnesium oxide (Cm-MgO). The MgO samples were subjected to structural characterization using XRD and FTIR, surface area and pore volume study by B.E.T. and SEM, and chemical composition by ICP-OES and thermogravimetric analysis (TGA). The crystalline periclase phase was identified for both samples, but the brucite phase was shown to be a secondary phase for the commercial sample. After the removal of chromium ions, the brucite crystalline phase became the majority phase for the samples, regardless of the concentration of ions removed. The pigments were characterized by color measurements and discussed in terms of colorimetric parameters using the CIELab method and electron spectroscopy (VIS-NIR). This study also evaluated the colorimetric stability of green pigments in aggressive environments (acidic and alkaline) over a 240 h exposure period, demonstrating minimal color difference. This study aims to develop materials for the decontamination of wastewater containing chromium and its reuse as a synthetic inorganic pigment, using an innovative and sustainable synthesis method.

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Green synthetic methodology: An evaluative study for impact of surface basicity of MnO2 doped MgO nanocomposites in Wittig reaction

Cited by 9 publications

References 33 publications

Catalytic Activation of Carbon–Hydrogen Bonds in Lignin Linkages over Strong-Base-Modified Covalent Triazine Frameworks for Lignin Oxidative Cleavage

Catalytic Activation of Carbon–Hydrogen Bonds in Lignin Linkages over Strong-Base-Modified Covalent Triazine Frameworks for Lignin Oxidative Cleavage

Eco-Friendly Polysaccharide-Based Synthesis of Nanostructured MgO: Application in the Removal of Cu2+ in Wastewater

Synthesis of Periclase Phase (MgO) from Colloidal Cassava Starch Suspension, Dual Application: Cr(III) Removal and Pigment Reuse

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