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Membrane fouling 2

XDLVO theory 2

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ultrafiltration membrane fouling behavior under different pH conditions: interface adhesion force and XDLVO

Xudong WANG,Miao ZHOU,Xiaorong MENG,Lei WANG,Danxi HUANG

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 4, doi: 10.1007/s11783-016-0855-9

Abstract: XDLVO theory shows the polar or Lewis acid–base interaction plays a major role in membrane fouling.The extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory predicts that the polar or Lewis acid–base

Keywords： PVDF membrane Membrane fouling Adhesion force Protein Interfacial free energy

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A critical review on thermodynamic mechanisms of membrane fouling in membrane-based water treatment process

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 10, doi: 10.1007/s11783-023-1729-6

Abstract:

● Fundamentals of membrane fouling are comprehensively reviewed.

Keywords： Membrane fouling Thermodynamic mechanism XDLVO theory Flory-Huggins theory Fouling migration

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Enhanced permeability and biofouling mitigation of forward osmosis membranes via grafting graphene quantum dots

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10, Pages 1470-1483 doi: 10.1007/s11705-023-2329-5

Abstract: In this paper, graphene oxide quantum dots with amino groups (NH₂-GOQDs) were tailored to the surface of a thin-film composite (TFC) membrane surface for optimizing forward osmosis (FO) membrane performance using the amide coupling reaction. The results jointly demonstrated hydrophilicity and surface roughness of the membrane enhanced after grafting NH₂-GOQDs, leading to the optimized affinity and the contact area between the membrane and water molecules. Therefore, grafting of the membrane with a concentration of 100 ppm (TFC-100) exhibited excellent permeability performance (58.32 L·m^–2·h^–1) compared with TFC membrane (16.94 L·m^–2·h^–1). In the evaluation of static antibacterial properties of membranes, TFC-100 membrane destroyed the cell morphology of Escherichia coli (E. coli) and reduced the degree of bacterial adsorption. In the dynamic biofouling experiment, TFC-100 membrane showed a lower flux decline than TFC membrane. After the physical cleaning, the flux of TFC-100 membrane could recover to 96% of the initial flux, which was notably better than that of TFC membrane (63%). Additionally, the extended Derjaguin–Landau–Verwey–Overbeek analysis of the affinity between pollutants and membrane surface verified that NH₂-GOQDs alleviates E. coli contamination of membrane. This work highlights the potential applications of NH₂-GOQDs for optimizing permeability and biofouling mitigation of FO membranes.

Keywords： forward osmosis membrane graphene oxide quantum dots graft modification anti-fouling membrane XDLVO