Comparison of adsorption models for the removal of fluorides, nitrates and sulfates by adsorption onto AFN membrane

IF 2 Q3 Environmental Science Water Quality Research Journal of Canada Pub Date : 2016-05-26 DOI:10.2166/WQRJC.2016.031

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

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引用次数: 1

Abstract

The main purpose of this work was to determine adsorption characteristics of fluoride, nitrate and sulfate ions on the AFN membrane. The sorption isotherms for ![Graphic][1] , ![Graphic][2] and ![Graphic][3] ions on the AFN membrane were investigated in the range of 0.05–1 mol.L–1 at 298 K. The suitability of the Langmuir, Dubinin–Astakhov (D-A) and Redlich–Peterson adsorption models to the equilibrium data was investigated. The sorption parameters of the studied models were determined by non-linear regression and discussed. Equilibrium data obtained in this study were found to best fit the Langmuir isotherm. The ΔG° values deduced from the Langmuir isotherm suggest that the affinity order of the AFN membrane for the studied anions is: ![Graphic][4] . In order to improve their selectivity towards monovalent ions, the AFN membrane was modified by adsorption of polyethyleneimine on its surface. Adsorption parameters values of the studied models were determined for the modified AFN membrane. The D-A model provides the best fit to the experimental points. In fact, removal of fluoride and nitrate ions by adsorption on the modified AFN membrane was more effective than the adsorption on the unmodified one. Desorption of fluoride from the modified AFN membrane by nitrate and sulfate ions was investigated. [1]: /embed/inline-graphic-1.gif [2]: /embed/inline-graphic-2.gif [3]: /embed/inline-graphic-3.gif [4]: /embed/inline-graphic-4.gif

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AFN膜对氟化物、硝酸盐和硫酸盐的吸附模型比较

研究了AFN膜对氟化物、硝酸盐和硫酸盐离子的吸附特性。在298 K下，在0.05 ~ 1 mol.L-1范围内，研究了离子在AFN膜上的吸附等温线。考察了Langmuir、Dubinin-Astakhov (D-A)和Redlich-Peterson吸附模型对平衡数据的适用性。采用非线性回归法确定了模型的吸附参数，并进行了讨论。本研究得到的平衡数据最符合朗缪尔等温线。由Langmuir等温线推导出ΔG°值，表明AFN膜对所研究阴离子的亲和顺序为:![图][4]。为了提高AFN膜对单价离子的选择性，在其表面吸附聚乙烯亚胺对其进行了改性。测定了各模型对改性AFN膜的吸附参数值。D-A模型对实验点的拟合效果最好。事实上，改性AFN膜对氟化物和硝酸盐离子的吸附效果优于未改性AFN膜。研究了硝酸根离子和硫酸根离子对改性AFN膜上氟的解吸作用。[2]: /embed/inline-graphic-2.gif [3]: /embed/inline-graphic-3.gif [4]: /embed/inline-graphic-4.gif

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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.