title: The structural and surface properties of natural and modified coal gangue.
abstract: A novel application of coal gangue as inexpensive adsorbents is considered in this study. The structural and surface properties of natural and modified gangue were studied via nitrogen adsorption. Four types of samples were studied: natural, modified with H2NO3and H2O2and calcined at 250 °C and 600 °C. The specific surface area and porosity of the samples were determined using various methods. The raw material is mainly mesoporous with relatively small specific surface area. The chemical modification enlarged the total pore volume and the specific surface area. The calcination at 250 °C enlarged slightly the pore volume and lowered the specific surface area, but did not cause significant changes in the structural properties. The calcination at 600 °C resulted in a significant increase in pore volume and a decrease in specific surface area. These results suggest that the coal gangue studied here could be used as inexpensive adsorbent in industrial wastewater pretreatment.
authors.affiliation: Czestochowa University of Technology, Faculty of Infrastructure and Environment, Institute of Environmental Engineering, Brzeźnicka St. 60a, 42-200 Częstochowa, Poland. Electronic address: bjablonska@is.pcz.czest.pl.
authors.forename: Beata
authors.initials: B
authors.lastname: Jabłońska
authors.affiliation: Czestochowa University of Technology, Faculty of Electrical Engineering, Al. Armii Krajowej 17, 42-200 Częstochowa, Poland.
authors.forename: Andriy V
authors.initials: AV
authors.lastname: Kityk
authors.affiliation: Institute of Materials Physics and Technology, Hamburg University of Technology (TUHH), D-21073 Hamburg, Germany.
authors.forename: Mark
authors.initials: M
authors.lastname: Busch
authors.affiliation: Institute of Materials Physics and Technology, Hamburg University of Technology (TUHH), D-21073 Hamburg, Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Huber
mesh_terms: D000327:Adsorption; D003031:Coal; D006861:Hydrogen Peroxide / Q000737:chemistry; D009573:Nitrites / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D016062:Porosity; D013499:Surface Properties; D013696:Temperature; D014866:Waste Products / Q000032:analysis
chemical_list: D003031:Coal; D009573:Nitrites; D014866:Waste Products; D006861:Hydrogen Peroxide; D009584:Nitrogen
keywords: Active surface; Coal gangue; Nitrogen adsorption; Porosity; Waste rocks