High-flux zwitterionic nanofiltration membrane constructed by in-situ introduction method for monovalent salt/antibiotics separation

2020 ◽  
Vol 593 ◽  
pp. 117441 ◽  
Author(s):  
Yao-Shen Guo ◽  
Yan-Li Ji ◽  
Bin Wu ◽  
Nai-Xin Wang ◽  
Ming-Jie Yin ◽  
...  
Keyword(s):  
High Flux ◽  
Nanofiltration Membrane ◽  
Monovalent Salt

A high flux organic solvent nanofiltration membrane from Kevlar aramid nanofibers with in situ incorporation of microspheres

2018 ◽  
Vol 6 (45) ◽  
pp. 22987-22997 ◽  
Author(s):  
Yi Li ◽  
Shushan Yuan ◽  
Chen Zhou ◽  
Yan Zhao ◽  
Bart Van der Bruggen
Keyword(s):  
Organic Solvent ◽  
High Flux ◽  
Nanofiltration Membrane ◽  
Organic Solvent Nanofiltration

Fabrication of a high flux organic solvent nanofiltration (OSN) membrane from aramid nanofibers (ANFs) with in situ incorporation of ANF/polyethyleneimine (PEI) microspheres.

Targeted modification of polyamide nanofiltration membrane for efficient separation of monosaccharides and monovalent salt

2021 ◽  
pp. 119250
Author(s):  
Jingyu Wang ◽  
Yuling Ren ◽  
Huiru Zhang ◽  
Jianquan Luo ◽  
John M. Woodley ◽  
...  
Keyword(s):  
Nanofiltration Membrane ◽  
Efficient Separation ◽  
Monovalent Salt

scholarly journals Fabrication of High-Performance Thin-Film Composite Nanofiltration Membrane by Dynamic Calcium-Carboxyl Intra-Bridging during Post-Treatment

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 137
Author(s):  
Hongyi Han ◽  
Ruobin Dai ◽  
Zhiwei Wang
Keyword(s):  
Thin Film ◽  
Water Purification ◽  
High Performance ◽  
Rejection Rate ◽  
Post Treatment ◽  
Nanofiltration Membrane ◽  
Film Composite ◽  
Thin Film Composite ◽  
Post Modification

Widespread applications of nanofiltration (NF) and reverse osmosis (RO)-based processes for water purification and desalination call for high-performance thin-film composite (TFC) membranes. In this work, a novel and facile modification method was proposed to fabricate high-performance thin-film composite nanofiltration membrane by introducing Ca2+ in the heat post-treatment. The introduction of Ca2+ induced in situ Ca2+-carboxyl intra-bridging, leading to the embedment of Ca2+ in the polyamide (PA) layer. This post modification enhanced the hydrophilicity and surface charge of NF membranes compared to the pristine membrane. More interestingly, the modified membrane had more nodules and exhibited rougher morphology. Such changes brought by the addition of Ca2+ enabled the significant increase of water permeability (increasing from 17.9 L·m−2·h−1·bar−1 to 29.8 L·m−2·h−1·bar−1) while maintaining a high selectivity (Na2SO4 rejection rate of 98.0%). Furthermore, the intra-bridging between calcium and carboxyl imparted the NF membranes with evident antifouling properties, exhibiting milder permeability decline of 4.2% (compared to 16.7% of NF-control) during filtration of sodium alginate solution. The results highlight the potential of using Ca2+-carboxyl intra-bridging post-treatment to fabricate high-performance TFC membranes for water purification and desalination.

Intracellular diffusion gradients of O2 and ATP

1986 ◽  
Vol 250 (5) ◽  
pp. C663-C675 ◽  
Author(s):  
D. P. Jones
Keyword(s):  
Mathematical Modeling ◽  
High Flux ◽  
Concentration Gradients ◽  
Electron Microscopic ◽  
Intracellular Diffusion ◽  
Metabolite Concentrations ◽  
Major Factors ◽  
Atp Supply ◽  
Endogenous Enzymes

Endogenous enzymes with different subcellular localizations provide in situ probes to study O2 and ATP concentration at various sites within cells. Results from this approach indicate that substantial intracellular concentration gradients occur under some O2- and ATP-limited conditions. These studies, along with electron microscopic analyses and mathematical modeling, indicate that clustering and distribution of mitochondria are major factors in determining the magnitude and location of the concentration gradients. The mitochondria appear to be clustered in sites of high ATP demand to maximize ATP supply under conditions of limited production. The size of such clusters is limited by the magnitude of the O2 gradient needed to provide adequate O2 concentrations for mitochondrial function within the clusters. Thus microheterogeneity of metabolite concentrations can occur in cells without membranal compartmentation and may be important in determining the rates of various high-flux processes.

An ultrahighly permeable-selective nanofiltration membrane mediated by an in situ formed interlayer

2020 ◽  
Vol 8 (10) ◽  
pp. 5275-5283 ◽  
Author(s):  
Yufan Hao ◽  
Quan Li ◽  
Benqiao He ◽  
Bo Liao ◽  
Xianhui Li ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Nanofiltration Membrane

An interlayer is in situ formed to regulate the morphologies and thickness of the polyamide layer during a chitosan assisted interfacial polymerization. The resulted NF membrane exhibits an ultrahigh permeability without compromising on selectivity.

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