FT-IR and XRD analysis of coal from Makum coalfield of Assam

Saikia, Binoy K.; Boruah, R. K.; Gogoi, P. K.

doi:10.1007/s12040-007-0052-0

Cited by 136 publications

(74 citation statements)

References 9 publications

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“…FTIR spectra of Rajmahal coals were taken and the transmittant bands were compared with the standard patterns of Cooke et al (1986), Das (2001), Grigoriew (1990), Scheinman (1970) and Speight (1994 Shifting of these peak positions of FTIR bands is attributed to the bacterial action. The peaks for O-H groups observed at 3600-3800 cm -1 are probably associated with those of clay minerals in agreement with the study of Saikia et al (2007). A few broader peaks are also visible at 3212.35 cm -1 and 3373.72 cm -1 .…”

Section: Revelations From Ftir Studysupporting

confidence: 89%

Demineralization of Rajmahal Gondwana Coals by Bacteria: Revelations from X-Ray Diffraction (XRD) and Fourier Transform Infra Red (FTIR) Studies

Singh

Kumar

et al. 2015

Energy Exploration & Exploitation

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The present paper entails the results of the demineralization of the Rajmahal Gondwana coals of India with Pseudomonas mendocina strain B6-1 and its signatures revealed in the X-ray Diffraction (XRD) and Fourier transform infrared (FTIR) spectra. The XRD study reveals the reduction of pyrite phase in the coal samples after bacterial treatment due to bio-oxidation of pyrite and the appearance of few new phases of jarosite. Moreover, the intensity of jarosite peaks has been noticed to increase after the bacterial treatment. The FTIR spectra of the bacterial treated Rajmahal coal samples indicate shifting of the absorption peaks as compared to the control samples. The oxidation of pyrite due to the bacterial action and its conversion into jarosite is indicated by the stretching of OH bond at 630 cm -1 peak. While the bacterial action on clay minerals in all the samples is indicated by the stretching of bonds at 1114 cm -1 to 430 cm -1 peaks.

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Section: Revelations From Ftir Studysupporting

confidence: 89%

Demineralization of Rajmahal Gondwana Coals by Bacteria: Revelations from X-Ray Diffraction (XRD) and Fourier Transform Infra Red (FTIR) Studies

Singh

Kumar

et al. 2015

Energy Exploration & Exploitation

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“…1, 2. Figure 1a shows that the FT-IR spectrum (curve 1) of Wucaiwan coal sample is consistent with that of other coal samples (Saikia et al 2008;Manoj and Elcey 2010;Balachandran 2014). Three types of peaks were found: (1) the peaks at 2923 and 1376 cm -1 correspond to the aliphatic structure; (2) the peaks at 3050, 1585, 826, and 763 cm -1 are the characteristic peaks of aromatic ring; (3) the peaks at 3350, 1715, 1250 cm -1 are assigned to the oxygen-containing functional groups.…”

Section: Properties Of Depolymerized Coal Samplessupporting

confidence: 77%

Effect of pH conditions on the depolymerization of Wucaiwan coal by mixed acids/ultrasound method and the product structures and performance

Zhang

Maimaiti

Zhang

et al. 2017

Int J Coal Sci Technol

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The cleavage of the aliphatic chain or ether bond connecting the polycyclic aromatic hydrocarbons in coal can be achieved by not only hydrogenation reduction but also oxidative acid treatment. In this paper, coal samples from Wucaiwan in Xinjiang were pretreated with HNO 3 followed by mixed acids/ultrasound treatment. The depolymerized coal samples obtained under different pH conditions were then separated by fractional washing. The structures and properties of the resulting coal samples were studied by elemental analysis, FT-IR, XRD, TG-DTA, TEM, UV-Vis, and PL. The results showed that when pH = 0.012, the obtained coal samples were fragments stripped off from the raw coal samples by ultrasound in strong acid conditions, aliphatic hydrocarbons linked with oxygen-containing groups such as nitro group, a small amount of small aromatic molecules and mineral salts; when pH = 1.99-4.09, the obtained coal samples were polycyclic aromatic hydrocarbons linked with oxygen-containing groups such as nitro group,possessing the annulus wall of multilayer graphene fragment structures built up by sp 2 carbons, and they are typical fluorescent substances of carbon nanoparticle structure. The former has no solubility in organic solvents, while the latter can be well dissolved in polar solvents such as acetone. All the depolymerized coal samples obtained under different pH conditions exhibited good absorption and ability of fluorescence emission.

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“…FTIR spectra bands were assigned based on the standard patterns of coal (Guo et al 1996;Saikia et al 2007). A broad absorption band is observed at 3411 cm -1 in the coal, which may be due to the presence of N-H and O-H groups.…”

Section: Organic Functional Groups In Coalmentioning

confidence: 99%

Geochemical characteristics and mode of occurrence of trace elements in coal at West Bokaro coalfield

Equeenuddin

Tripathy

Sahoo

et al. 2016

Int J Coal Sci Technol

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The mineralogy and trace element contents in coals from the West Bokaro coalfield, which is the one of the biggest Gondwana coalfields of India, were studied to delineate enrichment of trace elements and their modes of occurrence. Elemental concentrations with reference to their crustal abundances indicated that coals are relatively enriched in As (4.4-15.5 mg/kg), Cd (0.3-3.0 mg/kg), Cu (28.0-68.1 mg/kg) and V (46.6-178.0 mg/kg); depleted in Co (10.8-28.4 mg/ kg), Mn (7.6-483.4 mg/kg), Ni (13.0-31.6 mg/kg), Cr (14.2-85.5 mg/kg) and Zn (5.25-70.4 mg/kg). The concentration of As, Cd, Co, Cu and V were higher than the average values of world and Indian coals. Mineralogical study carried out by X-ray diffraction shows that quartz and kaolinite occur as dominant mineral phases in this coal. Fourier transform infrared spectroscopy pattern suggests organic structures primarily containing aromatic nuclei, aliphatic side chain and some oxygen containing groups. The modes of occurrence of trace elements present in these coals have been determined through statistical approach. Both Cu and Cr are more closely associated with mineral matter, whereas Co is dominantly present with its organic form. The concentrations of Cd, Mn, Ni, Zn, As and V have apparently occur in both organic and inorganic constituents. This study would be helpful to assess the potential environmental impacts during mining and combustion of this coal.

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FT-IR and XRD analysis of coal from Makum coalfield of Assam

Cited by 136 publications

References 9 publications

Demineralization of Rajmahal Gondwana Coals by Bacteria: Revelations from X-Ray Diffraction (XRD) and Fourier Transform Infra Red (FTIR) Studies

Demineralization of Rajmahal Gondwana Coals by Bacteria: Revelations from X-Ray Diffraction (XRD) and Fourier Transform Infra Red (FTIR) Studies

Effect of pH conditions on the depolymerization of Wucaiwan coal by mixed acids/ultrasound method and the product structures and performance

Geochemical characteristics and mode of occurrence of trace elements in coal at West Bokaro coalfield

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