The molecular structure of Inner Mongolia lignite utilizing XRD, solid state 13C NMR, HRTEM and XPS techniques

Wang, Jie; He, Yaqun; Hong, Li; Yu, Jiadong; Xie, Weining; Wang, Hua

doi:10.1016/j.fuel.2017.05.042

Cited by 127 publications

(80 citation statements)

References 38 publications

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“…It is clear from the latter that lignite is characterized with a typical two-dimensional (002) peak at 25.03°. This reflection corresponds to the spacing between aromatic layers present in this raw material [63]. Moreover, two small bands were also noticed at 41.52°and 54.85°related to (10) and (11) spacing, suggesting a certain rearrangement of carbon into a graphite-like structure.…”

Section: Raw and Pb(ii)-loaded Lignite Characterization And Adsorptiomentioning

confidence: 65%

Investigations on lignite use for lead removal from aqueous solutions under static and dynamic conditions: adsorption properties and mechanism exploration

Mlayah¹,

Jellali²,

Azzaz³

et al. 2021

Comptes Rendus. Chimie

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Section: Raw and Pb(ii)-loaded Lignite Characterization And Adsorptiomentioning

confidence: 65%

Investigations on lignite use for lead removal from aqueous solutions under static and dynamic conditions: adsorption properties and mechanism exploration

Mlayah¹,

Jellali²,

Azzaz³

et al. 2021

Comptes Rendus. Chimie

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show abstract

“…Figure 8 showed the XPS analysis of pure quartz, the XPS analysis of quartz treated with 50 mg/L CaCl 2 and 100 mg/L UFA at pH 11.50, and 25 • C and the XPS analysis of quartz treated with 50 mg/L CaCl 2 and 100 mg/L SFA at pH 11.50, and 25 • C. The results were summarized in Table 3. In the XPS spectra of quartz (Figure 8), an extremely weak C(1s) vibration at 284.8 eV was due to C-C and C-H bonds of hydrocarbon contamination from the environment [32]. In addition, the vibrations around 532 eV, 153 eV and 103 eV were related to the presence of oxygen and silicon [29] There was no other obvious vibrations, which indicated that the quartz was relatively pure and clear.…”

Section: Xps Analysismentioning

confidence: 98%

Comparative Studies on Flotation Performance of Saturated Fatty Acids and Unsaturated Fatty Acids Separated from Hogwash Oil

et al. 2021

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Low flotation recovery, high pulp temperature, and large dosage of reagents are the typical disadvantages when using mixed fatty acids (MFA) prepared from hogwash oil for flotation directly. To determine the type of fatty acid that yields poor flotation performance, flotation performance and adsorption characteristics of saturated fatty acids (SFA) and unsaturated fatty acids (UFA) separated from the MFA were studied in our work. GC-MS, FT-IR, iodine value detection and melting point measurement showed that UFA contained –(CH=CH–CH2)n- groups and had much lower melting point. Quartz flotation tests were used to compare the flotation performance of UFA and SFA, which showed that UFA had excellent low-temperature floatability, and the flotation recovery of UFA was 35 percentage points higher than that of SFA at 20 °C and pH = 11.5. Zeta potential, FT-IR and XPS analysis indicated that UFA and SFA could adsorb onto the surface of activated quartz through chemisorption and hydrogen bonding. However, the adsorption of UFA was much stronger and more favorable; thus, the reason MFA have poor flotation performance was the presence of SFA.

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“…XPS is often used to characterize the existence of oxygen, nitrogen and other heteroatoms in coal, which provides an important basis for the construction of macromolecular structure model of HLH [18]. XPS tests of HLH raw coal, microwave modified HLH and ultrasonic modified HLH were carried out, and the XPS maps of 3 samples were processed by peak fitting.…”

Section: Oxygen Element Analysismentioning

confidence: 99%

Experiments and 3D Molecular Model Construction of Lignite under Different Modification Treatment

et al. 2020

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In this paper, Huolinhe lignite was selected as the lignite experimental sample, using microwave modification and ultrasonic modification separately as improvement methods. The three-dimensional molecular models of HLH before and after modification were established base on the parameters obtained by 13C NMR, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman), and Fourier transform infrared (FTIR). After the microwave treatment, the methylene carbon in the HLH coal sample structure mostly exists in the form of long straight chains, and after microwave and ultrasonic treatment, the -OH content of oxygen atoms in the coal sample increases, and form the CO- and the COO-. The proportion is decreasing. The models were adjusted and tested by the covalent bond concentration method and carbon chemical shift spectra calculation using Chemdraw software. A new method is proposed to study the structure and physicochemical properties of lignite modification from the molecular point of view through this study.

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The molecular structure of Inner Mongolia lignite utilizing XRD, solid state 13C NMR, HRTEM and XPS techniques

Cited by 127 publications

References 38 publications

Investigations on lignite use for lead removal from aqueous solutions under static and dynamic conditions: adsorption properties and mechanism exploration

Investigations on lignite use for lead removal from aqueous solutions under static and dynamic conditions: adsorption properties and mechanism exploration

Comparative Studies on Flotation Performance of Saturated Fatty Acids and Unsaturated Fatty Acids Separated from Hogwash Oil

Experiments and 3D Molecular Model Construction of Lignite under Different Modification Treatment

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