Comparison of two low‐hazard organic solvents as individual and cosolvents for the fabrication of polysulfone membranes

Dong, Xiaobo; Shannon, Halle D.; Parker, Caleb; Jesus, Samantha De; Escobar, Isabel C.

doi:10.1002/aic.16790

Cited by 24 publications

(46 citation statements)

References 58 publications

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“…The viscosity of these dope solutions was measured using a rheometer (AG-G2, TA Instruments, New Castle, DE, USA) in the range of 0.1-10/s. Nonsolvent-induced phase separation theory (NIPS) was the method used to cast membranes [33][34][35], as shown in Figure 2. A doctor's casting blade with a thickness set as 200 μm was used to cast the thin film on a glass substrate at room temperature.…”

Section: Membrane Fabricationmentioning

confidence: 99%

“…Thickness of the membranes were measured at 100-120 μm using a deep throat digital thickness gage (547-520S, Mitutoyo Co., Kawasaki, Japan). The thickness difference before and after casting was analyzed in a previous study [35]. Water samples were taken from the post-casting gelation bath and the storing DI water to analyze if silver leached out during the casting and storage process.…”

Section: Membrane Fabricationmentioning

confidence: 99%

“…SEM was used to image the polymer complex, membrane surfaces and crosssections, while EDX was used to quantify the elemental composition on the membranes. The thickness difference before and after casting was analyzed in a previous study [35]. Water samples were taken from the post-casting gelation bath and the storing DI water to analyze if silver leached out during the casting and storage process.…”

Section: Scanning Electron Microscope/ Energy-dispersive X-ray Spectrmentioning

confidence: 99%

“…For laboratory-scale casting, a doctor's blade is often used to cast membranes [29,[33][34][35]46]; therefore, the dope solution should be a Newtonian fluid because the viscosity does not change over the shear rate [29,34,35]. Investigating the viscosity behavior over the shear rate of the dope solution is important because it is the fundamental information required if a larger scale casting is considered.…”

Section: Dope Solution Viscositymentioning

confidence: 99%

“…The viscosity of M1b, M1c, M2 and M3 dope solutions were all approximately 10 Pa.s, and they did not change significantly over the shear rate at 0.1-10 /s. The Newtonian fluid behavior of the produced dope solutions made them suitable for lab-scale casting using a doctor's blade [35]. Figure 6 shows the surface and cross-sectional images of the membranes.…”

Section: Dope Solution Viscositymentioning

confidence: 99%

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Thiol-Affinity Immobilization of Casein-Coated Silver Nanoparticles on Polymeric Membranes for Biofouling Control

et al. 2019

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Silver nanoparticles (AgNPs) have been widely studied for the control of biofouling on polymeric membranes due to their antimicrobial properties. However, nanoparticle leaching has posed a significant impediment against their widespread use. In this study, a one-step method of chemically embedding AgNPs on cellulose acetate (CA) membranes via their affinity to thiol group chemistry was investigated. The operational efficiency of the membranes was then determined via filtration and biofouling experiments. During filtration study, the average flux values of pure CA membranes was determined to be 11 ± 2 L/(m2·hr) (LMH), while membranes embedded with AgNPs showed significant increases in flux to 18 ± 2 LMH and 25 ± 9 LMH, with increasing amounts of AgNPs added, which is likely due to the NPs acting as pore formers. Leaching studies, performed both in dead-end and crossflow filtration, showed approximately 0.16 mg/L leaching of AgNPs after the first day of filtration, but afterwards the remaining chemically-attached AgNPs did not leach. Over 97% of AgNPs remained on the membranes after seven days of crossflow leaching filtration studies. Serratia marcescens were then used as target microorganisms in biofouling studies. It was observed that membranes embedded with AgNPs effectively suppressed the growth of Serratia marcescens, and specifically, membranes with AgNPs displayed a decrease in microbial growth by 59% and 99% as the amount of AgNP increased.

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Section: Membrane Fabricationmentioning

confidence: 99%

Section: Membrane Fabricationmentioning

confidence: 99%

Section: Scanning Electron Microscope/ Energy-dispersive X-ray Spectrmentioning

confidence: 99%

Section: Dope Solution Viscositymentioning

confidence: 99%

Section: Dope Solution Viscositymentioning

confidence: 99%

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Thiol-Affinity Immobilization of Casein-Coated Silver Nanoparticles on Polymeric Membranes for Biofouling Control

et al. 2019

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Vapor linker exchange of partially amorphous metal–organic framework membranes for ultra‐selective gas separation

Tang

Jia

et al. 2022

AIChE Journal

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Metal-organic framework (MOF) membranes are promising for efficient separation applications. However, the uncontrollable pathways at atomic level impede the further development of these membranes for molecular separation. Herein we show that vapor linker exchange can induce partial amorphization of MOF membranes and then reduce their transport pathways for precisely molecular sieving. Through exchanging MOF linkers by incoming ones with similar topology but higher acidity, the resulted metal-linker bonds with lower strength cause the transformation of MOF membranes from order to disorder/amorphous. The linker exchange and partial amorphization can narrow intrinsic apertures and conglutinate grain boundary/crack defects of membranes. Because of the formation of ultra-microporous amorphous phase, the MOF composite membrane shows competitive H 2 /CO 2 selectivity up to 2400, which is about two orders of magnitude higher than that of conventional MOF membranes, accompanied by high H 2 permeance of 13.4 Â 10 À8 mol m À2 s À1 Pa À1 and good reproducibility and stability.

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Fabrication and evaporation time investigation of water treatment membranes using green solvents and recycled polyethylene terephthalate

Babaniamansour

Williams

et al. 2022

J of Applied Polymer Sci

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Many materials traditionally used for polymeric membrane fabrication incur significant environmental impacts and limit sustainability of the process; therefore, more eco‐friendly materials are needed in membrane fabrication. In this study, recycled polyethylene terephthalate (rPET) and a solvent blend of Rhodiasolv® PolarClean (PolarClean) and gamma‐valerolactone (GVL) were used as eco‐friendly materials to fabricate polysulfone (PSf) ultrafiltration membranes. The calculated Hansen solubility parameter affinity and relative energy difference values for PET and PolarClean‐GVL of 6.94 and 0.86, respectively, indicate favorable dissolution to create the preceding dope solution. At a baseline evaporation time of 30 s, the resulting rPET‐PSf/PolarClean‐GVL membranes outperformed the filtration capabilities of PSf/NMP membranes with 3.5% higher permeability (23.4 LMH/bar) and 53.2% greater rejection (84.9%) of bovine serum albumin (BSA). Increasing the evaporation time to 60 s resulted in a 32.4 LMH/bar decrease in permeability and 0.8% increase in BSA rejection, whereas decreasing the evaporation time to 0 s generally led to a 235.8 LMH/bar increase in permeability and 4% increase in BSA rejection. The findings indicate the potential for eco‐friendly materials to serve as alternatives for traditional materials in polymeric membranes.

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Comparison of two low‐hazard organic solvents as individual and cosolvents for the fabrication of polysulfone membranes

Cited by 24 publications

References 58 publications

Thiol-Affinity Immobilization of Casein-Coated Silver Nanoparticles on Polymeric Membranes for Biofouling Control

Thiol-Affinity Immobilization of Casein-Coated Silver Nanoparticles on Polymeric Membranes for Biofouling Control

Vapor linker exchange of partially amorphous metal–organic framework membranes for ultra‐selective gas separation

Fabrication and evaporation time investigation of water treatment membranes using green solvents and recycled polyethylene terephthalate

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