Journal
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Volume 107, Issue -, Pages 147-152Publisher
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.psep.2017.02.007
Keywords
Underground coal gasification; Groundwater pollution; Semi-coke; Structural properties; Phenol adsorption; Self-remediation
Categories
Funding
- National Natural Science Foundation of China [51174077, 51404098]
- Doctoral Scientific Fund Project of the Ministry of Education of China [20124116110002]
- International Science and Technology Cooperation Project of Henan Province [152102410047]
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Groundwater pollution caused by underground coal gasification (UCG) as well as its purification is a great concern for scientific and engineering community. In the present study, a UCG model test of Hebi coal was carried out by air/steam two-stage gasification method. The physicochemical properties of UCG residual semi-coke samples were characterized by SEM, nitrogen adsorption at 77 K and FTIR, respectively. Adsorption experiments of phenol onto semi-coke samples were also performed. The results can be summarized as follows: (a) obvious cracks and small voids were observed in semi-coke samples; (b) compared with raw coal, semi-coke presented a larger BET surface area of 21.6 m(2)/g, larger pore volume of 0.087 cm(3)/g and wider pore size distribution with micro pores in size of 1.5-2 nm; (c) surface functional groups such as hydroxyl and carbonyl were partially preserved after gasification; (d) and the maximum removal rate of phenol approximately reached 35%. The dispersion forces between,pi electrons of aromatic nucleus in semi-coke and phenol ring and the formation of electron donor-acceptor complex make it work for phenol adsorption. (C) 2017 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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