Spectral manifestations of change in electronic structure in phenol-phenolate anion-phenoxy radical series

Kotorlenko, L. A.; Aleksandrova, V. S.

doi:10.1007/bf00516786

Cited by 8 publications

(6 citation statements)

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“…From Figure 1 it is evident, that all the spectra of CA/CeO 2 contain new bands of medium intensity at~1200,~1168 cm −1 , while νCO (1219 cm −1 ) [41,42,52] and βOH (1176 cm -1 [52,53], 1300-1400 cm -1 [52,54,55]) are shown only for high concentrations of CA (0.9 and 1.2 mmol/g). For a sample with a concentration of CA 0.6 mmol/g, an additional maximum at 1230 cm −1 appears.…”

Section: Colloids Interfaces 2019 3 X For Peer Review 4 Of 14mentioning

confidence: 96%

Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

Nastasiienko

Palianytsia

Кartel

et al. 2019

Colloids and Interfaces

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The studies of pyrolysis of caffeic acid (CA) and its surface complexes is important for the development of technologies of heterogeneous catalytic pyrolysis of plant- and wood- based renewable biomass components. In this work, the structure and thermal transformations of the surface complexes of CA on the surface of nanoceria were investigated using Fourier transform–infrared (FT–IR) spectroscopy, thermogravimetric analysis (TGA) and temperature-programmed desorption mass spectrometry (TPD MS). It was found that CA on the surface of cerium dioxide forms several types of complexes: bidentate carboxylates, monodentate carboxylates and complexes formed as a result of interaction with phenolic hydroxyl groups. This is due to the ability of nanosized cerium dioxide to generate basic hydroxyl groups that can deprotonate phenolic groups to form phenolates on the surface. The main pyrolysis products were identified. The possible ways of forming 3,4-dihydroxyphenylethylene, acetylene carboxylic acid, pyrocatechol and phenol from surface complexes of CA were suggested. It was established that on the nanoceria surface effectively occur the decarboxylation, decarbonylation, and dehydration reactions of the CA, which are the desirable processes in biomass conversion technologies.

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Section: Colloids Interfaces 2019 3 X For Peer Review 4 Of 14mentioning

confidence: 96%

Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

Nastasiienko

Palianytsia

Кartel

et al. 2019

Colloids and Interfaces

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“…47 This assignment is further confirmed by a shift of ∼20 cm −1 from the ν(CO) band measured in the bulk solution IR at 1250 cm −1 , consistent with the literature as indicative of the formation of a phenolate species. 48,49 The peaks at 1506 and 1610 cm −1 are assigned to ν(CC) ring vibrations 50,51 and the peak at 1180 cm −1 is assigned to a C−CH 3 stretch. 52 Interference bands from atmospheric water vapor can be seen in the 1300−1700 cm −1 region.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Adsorption of 4-n-Nonylphenol, Carvacrol, and Ethanol onto Iron Oxide from Nonaqueous Hydrocarbon Solvents

et al. 2019

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The adsorption of 4-n-nonylphenol (4NP), carvacrol, and ethanol onto the surface of iron oxide from nonaqueous solutions is presented. It is found that adsorption of 4NP from alkanes is strong and proceeds to monolayer formation, where the molecules are essentially "upright". However, at high relative concentrations, ethanol successfully outcompetes 4NP for the iron oxide surface. Estimates of the enthalpy and entropy of binding of 4NP were found to be exothermic and entropically disfavored. Sum frequency generation vibrational spectroscopy data indicate some evidence of binding through a phenolate anion, despite the nonpolar, nonaqueous solvent. Carvacrol is also found to adsorb as a monolayer where the molecules are lying "flat". The adsorption of ethanol onto iron oxide from dodecane was investigated through the use of quantitative NMR, which is a convenient analytical technique for measuring adsorption isotherms. It was concluded that ethanol does not form adsorbed monolayers on the surface. Instead, it partitions onto the surface as a surface-enhanced local phase separation related to its poor solubility in alkane solvents.

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“…Phenol donates a proton to the hydroxyl ions in the alkaline solution, with the phenol becoming the phenolate anion (phenoxide anion). In other words, the phenol will absorb some water in the binder and accordingly increase the binder viscosity [39]. Consequently, the diffusion and mobility of the geopolymer network are reduced.…”

Section: Binder Characterisationmentioning

confidence: 99%

“…Absorption peak at 1231 cm −1 in the geopolymer binder with phenol flakes corresponded to the C-C-O asymmetric stretch. In addition, the peaks at 1480 and 1587 cm −1 related to the C=C aromatic ring vibrations of phenoxide anion [39].…”

Section: Atr-ftir Characterizationmentioning

confidence: 99%

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Geopolymer-Bonded Laminated Veneer Lumber as Environmentally Friendly and Formaldehyde-Free Product: Effect of Various Additives on Geopolymer Binder Features

Shalbafan

Thoemen

2020

Applied Sciences

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Environmentally friendly and formaldehyde-free laminated veneer lumber (LVL) was manufactured using geopolymer constituents as binder. The main aim of the study was to improve the bonding quality between the geopolymer binder and the wood constituents. To this end, the effect of various additives (phenol flakes, conventional silica fume, and grafted silica fume with 3-aminopropyltriethoxysilane (APTES)) in the geopolymer binder features were explored via gel time and viscosity measurements, differential scanning calorimetry (DSC), and Fourier transom infrared spectroscopy. The mechanical properties (shear, bending, and compression) of LVL panels were also determined. Results showed that adding both types of silica fume had a positive impact on the geopolymer binder features. The formation of an alkaline aluminosilicate network was proven by observing the characteristics peaks of geopolymer binder at about 683 and 970 cm−1. A peak temperature of about 98 °C was determined for the geopolymer binder curing via DSC analysis. The mechanical properties were the highest for LVL panels made of geopolymer binder with grafted silica fume. It is feasible that the APTES used as grafting agent created a better bonding mechanism with superficial wood cells. In summary, the produced LVL panel showed good properties, but it still needs to be further improved to reach the required levels for use in interior and humid application.

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Spectral manifestations of change in electronic structure in phenol-phenolate anion-phenoxy radical series

Cited by 8 publications

References 1 publication

Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

Adsorption of 4-n-Nonylphenol, Carvacrol, and Ethanol onto Iron Oxide from Nonaqueous Hydrocarbon Solvents

Geopolymer-Bonded Laminated Veneer Lumber as Environmentally Friendly and Formaldehyde-Free Product: Effect of Various Additives on Geopolymer Binder Features

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