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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 12    December 2016

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Membrane behavior of bentonite-amended Fukakusa clay in K, Na and Ca solutions
TANG Qiang(唐强)1, LIU Wei(刘维)1, WANG Heng-yu(王恒宇)2, CHENG Rong(程蓉)3, QIAN Yin-fei(钱寅飞)3

1. School of Urban Rail Transportation, Soochow University, Suzhou 215131, China;
2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
3. Environmental Sanitation Administration Agency, Suzhou 215131, China

Abstract:Bentonite has been proven to be effective in enhancing the membrane property of clay, by which landfill liners can have better barrier performance with regard to the migration of contaminants. In this work, 5% sodium bentonite amended with locally available Fukakusa clay was utilized to evaluate the membrane behavior toward different kinds of ions: K, Na and Ca. The chemico-osmotic efficiency coefficient, ω, was obtained in electrolyte solution with different concentrations of 0.5, 1, 5, 10, and 50 mmol/L. According to the results, solute type and ion valence have a significant effect on membrane behaviors. Additionally, ω continually decreased as the Na and Ca concentrations increased, which is consistent with the Gouy-Chapman theory. The membrane behavior toward Na was similar to that toward K, according to the chemico-osmotic efficiency coefficient ω. In the case of the divalent ion Ca, the membrane behavior was lower compared to monovalent ions Na and K at the same concentration. The mechanisms of the membrane performance change were discussed with the assistance of XRD patterns, free-swelling results and SEM images.

 

Key words: bentonite-amended Fukakusa clay; chemico-osmotic efficiency coefficient; mechanism; membrane behavior

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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