离子强度对AMX膜与电解质溶液间离子交换平衡的影响

IF 2 Q3 Environmental Science

Water Quality Research Journal of Canada Pub Date : 2016-02-15 DOI:10.2166/WQRJC.2015.006

Islem Louati, F. Guesmi, A. Chaabouni, Chiraz Hannachi, B. Hamrouni

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引用次数: 4

摘要

研究了离子强度变化对天然水体(Cl−、NO3−和SO42−)中AMX阴离子交换膜与含优势阴离子电解质溶液之间离子交换平衡的影响。所有实验均在25℃恒温下进行。建立了离子强度为0.1 ~ 0.5 M时(Cl−/NO3−)、(Cl−/SO42−)和(NO3−/SO42−)体系的离子交换等温线。结果表明，当I = 0.1 M时，亲和顺序为SO42−>NO3−>Cl−。当I = 0.2 M时，其顺序为NO3−>SO42−>Cl−。在0.3和0.5 M时，AMX膜对氯化物的选择性比对硝酸盐或硫酸盐的选择性更强。计算了选择性系数KNO3−Cl−、K2Cl−SO42−和K2NO3−SO42−、热力学常数和分离因子，它们随着离子强度的增加而减小。

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Effect of ionic strength on the ion exchange equilibrium between AMX membrane and electrolyte solutions

The effect of ionic strength variation on the ion exchange equilibrium between AMX anion exchange membrane and electrolyte solutions containing the most dominant anions on natural waters (Cl−, NO3−, and SO42−) was studied. All experiments were carried out at a constant temperature of 25 °C. Ion exchange isotherms were established, at different ionic strengths from 0.1 to 0.5 M, for the systems (Cl−/NO3−), (Cl−/SO42−) and (NO3−/SO42−). Obtained results showed that for I = 0.1 M the affinity order is SO42 −>NO3−>Cl−. For I = 0.2 M this order is NO3−>SO42−>Cl−. For 0.3 and 0.5 M the AMX membrane becomes more selective for chloride than for nitrate or sulfate. Selectivity coefficients KNO3−Cl−, K2Cl−SO42− and K2NO3−SO42−, thermodynamic constants, and separation factors were calculated and decreased with the increase of ionic strength.

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来源期刊

Water Quality Research Journal of Canada WATER RESOURCES-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Water Quality Research Journal publishes peer-reviewed, scholarly articles on the following general subject areas: Impact of current and emerging contaminants on aquatic ecosystems Aquatic ecology (ecohydrology and ecohydraulics, invasive species, biodiversity, and aquatic species at risk) Conservation and protection of aquatic environments Responsible resource development and water quality (mining, forestry, hydropower, oil and gas) Drinking water, wastewater and stormwater treatment technologies and strategies Impacts and solutions of diffuse pollution (urban and agricultural run-off) on water quality Industrial water quality Used water: Reuse and resource recovery Groundwater quality (management, remediation, fracking, legacy contaminants) Assessment of surface and subsurface water quality Regulations, economics, strategies and policies related to water quality Social science issues in relation to water quality Water quality in remote areas Water quality in cold climates The Water Quality Research Journal is a quarterly publication. It is a forum for original research dealing with the aquatic environment, and should report new and significant findings that advance the understanding of the field. Critical review articles are especially encouraged.