纳滤
膜
化学
电荷密度
等电点
钠
氯化物
二价
分析化学(期刊)
膜污染
结垢
无机化学
化学工程
色谱法
有机化学
工程类
物理
酶
量子力学
生物化学
作者
Nataraj Sanna Kotrappanavar,Altaf Hussain,M.E.E. Abashar,Ibrahim S. Al-Mutaz,Tejraj M. Aminabhavi,Mallikarjuna N. Nadagouda
出处
期刊:Desalination
[Elsevier]
日期:2011-10-01
卷期号:280 (1-3): 174-182
被引量:62
标识
DOI:10.1016/j.desal.2011.07.007
摘要
Two commercial nanofiltration (NF) membranes viz., NF 300 MWCO and NF 250 MWCO were used for neutral and charged solute species viz., glucose, sodium chloride and magnesium chloride to investigate their rejection rates using Donnan steric pore model (DSPM) and DSPM-dielectric exclusion (DSPM-DE) model. The estimated pore radii are 0.62 nm and 0.56 nm, respectively for the above models, while permeabilities of both the membranes are almost identical. Charge densities were computed using Stokes–Einstein, Born effective and Pauling radii, while dielectric exclusion was assessed for NF 250 membrane. The effect of pH for sodium chloride was studied to evaluate isoelectric point of NF membrane, which was around pH 5. Correlations were attempted between charge density, concentration and pH for each radius. Charge density decreased drastically for sodium chloride when dielectric exclusion was included in the calculations, thus showing real physical characteristics of the membranes, whereas divalent magnesium chloride showed a shift from positive to negative charge density. The importance of charge density and pore radius in understanding fouling propensity of NF membranes was discussed.
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