Abstract
Coal fly ash (CFA) and coal-based incense sticks ash (ISA) have several similarities and differences due to the presence of coal as a common component in both of them. CFA are produced from the combustion of pulverized coal during electricity production in the thermal power plants while ISA are produced from the burning of incense sticks at religious places and at houses. A typical black colored Indian, incense sticks are mainly are comprised of coal powder or potassium nitrate, wood chip, fragrance, binder or binding agent, and bamboo sticks. The black colored incense sticks have coal powder or charcoal as a facilitator for smoother burning of incense sticks. The detailed investigation of CFA and ISA by X-ray fluorescence spectroscopy (XRF), electron diffraction spectroscopy (EDS), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), Fourier transform-infrared (FTIR), X-ray diffraction (XRD), particle size analyzer (PSA), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) revealed the morphological, chemical, and elemental properties. Both the coal based ashes comprises minerals like calcites, silicates, ferrous, alumina, and traces of Mg, Na, K, P, Ti, and numerous toxic heavy metals as confirmed by the XRF, ICP-AES, and EDS. While, microscopy revealed the presence of well-organized spherical shaped particles, namely cenospheres, plerospheres, and ferrospheres of size varying from 0.02 μm to 7 microns in CFA. Whereas, ISA particles are irregular, aggregated, calcium to carbon rich whose size varies from 60 nm to 9 microns and absence of well-organized spherical structures. The well developed and crystalline structure in CFA is due to the controlled combustion parameter in thermal power plants during the burning of coal while incense sticks (IS) burning is under uncontrolled manner. So, FTIR and XRD confirmed that the major portion of fly ash constitutes crystalline minerals whereas ISA have mainly amorphous phase minerals. CFA have ferrospheres of both rough and smooth surfaced, which was absent from the ISA and hence ferrous particles of CFA are of high magnetic strength. The detailed investigation of ashes will lead to the applications of ashes in new fields, which will minimize the solid waste pollution in the environment.
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Abbreviations
- 3Al2O3·2SiO2:
-
mullite
- Al2O3:
-
aluminum oxide
- CaO:
-
lime
- Ce:
-
cerium
- CFA:
-
coal fly ash
- CTPPs:
-
coal-based thermal power plants
- Dy:
-
dysposium
- EDS:
-
electron diffraction spectroscopy
- Fe2O3:
-
hematite, ferrous
- FESEM:
-
field emission scanning electron microscopy
- FTIR:
-
Fourier transform infrared spectroscopy
- HF:
-
hydrofluoric acid
- ICP-AES:
-
inductively coupled plasma atomic emission spectroscopy
- ISA:
-
incense sticks ash
- MTs:
-
million tons
- Na2O:
-
sodium dioxide
- PAH:
-
polyaromatic hydrocarbons
- PCHs:
-
polyaromatic cyclic hydrocarbons
- PDI:
-
poly dispersity index
- PSA:
-
particle size analyzer
- SAED:
-
scattering area electron diffraction
- Sc:
-
scandium
- SiO2:
-
quartz, silica
- TEM:
-
transmission electron microscopy
- Th:
-
thorium
- TiO2:
-
titanium dioxide, gypsum, and rutile
- TPPs:
-
thermal power plants
- XRD:
-
X-ray diffraction
- XRF:
-
X-ray fluorescence spectroscopy
- Y:
-
yttrium
- Yb, V, Er:
-
erbium
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Acknowledgements
The authors are also thankful to the Central Instrument Facility-Centre for Nanosciences and Nanotechnology of Jamia Millia Islamia, New Delhi, SRM–University, Chennai, CECRI (CSIR)-Karikudi, Tamil Nadu, and School of Chemistry-Hyderabad University, Telangana, for extending their instrumentation facilities.
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The authors extend their sincere appreciation to researchers supporting project number (RSP-2020/129), King Saud University, Riyadh, Saudi Arabia, for funding this research.
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VKY investigated the samples for ICP-AES, XRF, and EDS, and prepared original draft of the manuscript. Material preparation, data collection, and analysis were performed by GG. MMSCP and JA investigated and interpreted XRD, FTIR, and PSA results. MA and NG critically revised the manuscript. BS analyzed and interpreted FESEM micrographs. NC analyzed and interpreted TEM micrographs. GKI prepared original draft of the manuscript. KKY supervised the prepared original draft and revised of the manuscript. All authors read and approved the final manuscript.
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Yadav, V.K., Gnanamoorthy, G., Cabral-Pinto, M.M.S. et al. Variations and similarities in structural, chemical, and elemental properties on the ashes derived from the coal due to their combustion in open and controlled manner. Environ Sci Pollut Res 28, 32609–32625 (2021). https://doi.org/10.1007/s11356-021-12989-5
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DOI: https://doi.org/10.1007/s11356-021-12989-5