Mesoporous manganese silicate composite adsorbents synthesized from high-silicon iron ore tailing

被引:30
作者
Bai, Shansong [1 ,2 ,3 ]
Tian, Guangyan [1 ,2 ,3 ]
Gong, Linlin [1 ,2 ,3 ]
Tang, Qingguo [1 ,2 ,3 ]
Meng, Junping [1 ,2 ,3 ]
Duan, Xinhui [1 ,2 ,3 ]
Liang, Jinsheng [1 ,2 ,3 ]
机构
[1] Hebei Univ Technol, Minist Educ, Key Lab Special Funct Mat Ecol Environm & Informa, Tianjin 300130, Peoples R China
[2] Hebei Univ Technol, Inst Power Source & Ecomat Sci, Tianjin 300130, Peoples R China
[3] Hebei Univ Technol, Mfg Innovat Ctr Solid Waste Resource Utilizat & E, Tianjin 300130, Hebei, Peoples R China
关键词
Iron ore tailing; Manganese silicate composite; Hydrothermal reaction; Selective adsorption; METAL-ORGANIC FRAMEWORK; GLASS-CERAMIC TILE; METHYLENE-BLUE; AQUEOUS-SOLUTION; GRAPHENE OXIDE; ADSORPTION; PERFORMANCE; DYE; DEGRADATION; RECOVERY;
D O I
10.1016/j.cherd.2020.04.038
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Iron ore tailing (IOT) as a solid waste has attracted attention worldwide owing to the potential safety hazards and waste of resources. However, few studies focused on exploiting the structural characteristics of IOT. IOT is a special silicate mineral mixture composed of, for example, quartz, anorthite, microcline, and clinochlore which contain adjustable silica tetrahedron structures. In our research, Mn2+ was introduced to hydrothermally react with the adjustable silica tetrahedrons of IOT with the aid of sodium silicate, to provide IOT with reactive Mn-OH groups and high specific surface areas by constructing functional value-added mesoporous manganese silicate (MS) composites. It was found that the specific surface area (SBET) of IOT improved from 6.3 to 448.2 m(2)g(-1) and achieved ideal pore size distributions after being transformed into MS composites. The composite obtained exhibited an excellent selective adsorption performance that could rapidly remove 100% methylene blue (MB) molecules from the mixed cationic dye solutions within 1 min. The adsorption behavior was well described by pseudo second-order model and Freundlich isotherm model, indicating the chemical adsorption and multi-layer adsorption. The maximum adsorption capacity was up to 217 mg g(-1) (25 C, pH = 7, adsorption time: 120 min, MB initial concentration: 400 mg L-1). Through investigation, it was found that the selective adsorptive ability is based on the hydrogen bonding and the suitable mesoporous structure for MB molecules. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:543 / 554
页数:12
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