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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年第10期17卷 147-169页

作者： Jiaheng Teng Ying Deng Xiaoni Zhou Wenfa Yang Zhengyi Huang Hanmin Zhang Meijia Zhang Hongjun Lin Key Laboratory of Watershed Earth Surface Processes and Ecological Security College of Geography and Environmental SciencesZhejiang Normal UniversityJinhua 321004China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

Membrane technology is widely regarded as one of the most promising technologies for wastewater treatment and reclamation in the 21st century. However, membrane fouling significantly limits its applicability and productivity. In recent decades, research on the membrane fouling has been one of the hottest spots in the field of membrane technology. In particular, recent advances in thermodynamics have substantially widened people’s perspectives on the intrinsic mechanisms of membrane fouling. Formulation of fouling mitigation strategies and fabrication of anti-fouling membranes have both benefited substantially from those studies. In the present review, a summary of the recent results on the thermodynamic mechanisms associated with the critical adhesion and filtration processes during membrane fouling is provided. Firstly, the importance of thermodynamics in membrane fouling is comprehensively assessed. Secondly, the quantitative methods and general factors involved in thermodynamic fouling mechanisms are critically reviewed. Based on the aforementioned information, a brief discussion is presented on the potential applications of thermodynamic fouling mechanisms for membrane fouling control. Finally, prospects for further research on thermodynamic mechanisms underlying membrane fouling are presented. Overall, the present review offers comprehensive and in-depth information on the thermodynamic mechanisms associated with complex fouling behaviors, which will further facilitate research and development in membrane technology.

关键词： Membrane fouling Thermodynamic mechanism XDLVO theory flory-huggins theory Fouling migration

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Calculation on phase diagrams of polyetherimide/ N,N-dimethylacetamide/H2O-BuOH casting system and their relevance to membrane performances

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Frontiers of Chemical Science and Engineering 2014年第3期8卷 312-319页

作者： Ming TAN Gaohong HE Yan DAI Rujie WANG Wenhua SHI State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology School of Chemical Engineering Dalian University of Technology Dalian 116024 China Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China

The ternary phase diagrams of polyetherimide （PEI）/N,N-dimethylacetamide （DMAc） with H2O and BuOH as non-solvent were simulated using solubility parameter and flory-huggins theory. The phase diagrams show that 5.5% H2O/BuOH system containing 5% BuOH and 0.5% H2O or 6.5% H2O/BuOH system containing 6.2% BuOH and 0.3% H2O is required to induce liquid- liquid demixing for 20 wt-% PEI/DMAc casting solution. Therefore, BuOH can enhance the phase separation of the PEI casting solution and hereby induce higher porosity of the membrane, and the diffusion of BuOH into the water coagulation bath causes larger pore size easily compared with DMAc. Our predictions that the membrane pure water flux first increases then decreases, and the rejection ratio of bovine serum albumin decreases with the increasing concentration of BuOH were validated by the experiments using the prepared membranes.

关键词： phase diagram solubility parameter interaction parameter ultrafiltration flory-huggins theory

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聚合物A/B共混理论:相平衡及Coil-to-Globule转变

聚合物A/B共混理论:相平衡及Coil-to-Globule转变

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中国化学会2017全国高分子学术论文报告会

作者：徐玉赐 Zhen-Gang Wang 宁波大学 California Insititute of Technology

flory-huggins理论是描述聚合物共混里程碑式的工作,通过假设高分子A/B均匀混合,并用一个唯象的相互作用参数c来表示它们之间的相互作用从而得到体系的自由能。当大于临界c时候,共混体系会分相,形成稀相与浓相两相。但是在稀溶液的情况... 详细信息

flory-huggins理论是描述聚合物共混里程碑式的工作,通过假设高分子A/B均匀混合,并用一个唯象的相互作用参数c来表示它们之间的相互作用从而得到体系的自由能。当大于临界c时候,共混体系会分相,形成稀相与浓相两相。但是在稀溶液的情况下,体系真实的物理图像并不是flory-huggins所描述的均匀分布,而是具有局部的浓度涨落。我们通过考虑这种局部的浓度涨落,发现在稀溶液的情况下,F-H理论由于假设均匀分布,而过高的估计了体系相互作用能,进而极大的低估了溶解度极限;另一方面,稀相浓度与聚合度N的指数关系也并非为F-H所预测的N,而是N的关系。最后我们对局部涨落单链的Globule-to-Coil转变也进行了研究,发现随着chi的降低,单链分子会经历完全榻缩小球,到表面溶胀,然后再到Coil结构。

关键词： flory-huggins theory Localized Fluctuation Self-Consistent Field theory Coil-to-Globule Transition

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