Citation: LIU Xiang-chun, FENG Li, WANG Xin-hua, ZHANG Man, SHI Xiao-feng. Effect of K⁺, Na⁺, Ca²⁺ and Mg²⁺ on equilibrium adsorption of water content of Shengli lignite[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(4): 385-391. shu

Effect of K⁺, Na⁺, Ca²⁺ and Mg²⁺ on equilibrium adsorption of water content of Shengli lignite

1.
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China

Corresponding author: FENG Li,
Received Date: 27 October 2013
Available Online: 22 December 2013
Fund Project: 国家自然科学基金(51274197) (51274197)国家重点基础研究发展规划(973计划,2012CB214900)。 (973计划,2012CB214900)

To investigate the effects of cations on equilibrium re-adsorption water content of lignite, the acid-washed Shengli lignite was exchanged with different concentrations of K₂SO₄, Na₂SO₄, MgSO₄, Ca(CH₂COOH)₂ solution, respectively. Ion-exchange process was characterized by the changes in wavenumber of carboxyl group and the ash contents. The equilibrium adsorption water contents of all samples were determined in a range of relative humidities. It is shown that the extent of ion-exchanged exchange in Shengli coal is in order of Ca²⁺>Na⁺>K⁺>Mg²⁺. The relative effectiveness of cations in increasing the equilibrium adsorption water content is in order of Mg²⁺>Ca²⁺>Na⁺≈K⁺. At high relative humidity, the factor that control equilibrium adsorption water content is free water molecules interactions. However, at middle relative humidity capillary force between metal cation-carboxyl group complex and capillary is more important. At low relative humidity water interactions with sorption sites which are cation-carboxyl group complex become more important.
- lignite,
- ion-exchange,
- FT-IR,
- equilibrium adsorption water content,
- ionic hydration
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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of K+, Na+, Ca2+ and Mg2+ on equilibrium adsorption of water content of Shengli lignite

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通讯作者: 陈斌, bchen63@163.com

Effect of K⁺, Na⁺, Ca²⁺ and Mg²⁺ on equilibrium adsorption of water content of Shengli lignite