Coupled contamination of mine water on PES ultrafiltration membranes analyzed by XDLVO theory
Membrane fouling is the main problem that limits the development of membrane technology.The coupled organic(humic acid)-inorganic salt contamination behavior of PES ultrafiltration membranes in the treatment of mine water was investigated using the XDLVO(Extended-Derjaguin-Landau-Verway-Overbeek)theory,it was found that inorganic salt ions could exacerbate the contamination behavior between humic acid solutions and membranes,with increasing salt ionic concentrations,the attractive force provided by van der Waals forces between contaminants gradually rising and the repulsive force provided by polar and bilayer forces gradually decreasing,exacerbating membrane contamination;Among them,Ca2+had the greatest effect of influence,Mg2+is the second,and Na+had the least effect.At the same time,two different hydrophilic PES ultrafiltration membranes were selected to analyze the contamination behavior from multiple perspectives by evaluating the interfacial interaction energy between the membranes and mine water contaminants,it is found that the forces that change their interfacial interaction energy are mainly polar forces,with van der Waals and double layer forces playing a very minor role,It indicates that the polar force plays a decisive role in the membrane's anti-pollution property,and the magnitude of the polar force is related to the hydrophilic groups on the membrane surface,proving that the hydrophilicity of the membrane surface affects the anti-pollution property of ultrafiltration membranes by influencing the polar force and then the anti-pollution property of the membranes.
mine watermembrane foulinghumic acidinorganic saltXDLVO theory
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