Novel method for the facile control of molecular weight cut-off (MWCO) of ceramic membranes

Chung, Youngkun; Park, Daeseon; Kim, Hyojeon; Nam, Soohyun; Kang, Seoktae

doi:10.1016/j.watres.2022.118268

Cited by 20 publications

(4 citation statements)

References 40 publications

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“…A sieving curve, shown in Figure S2, was recorded, leading to an MWCO of approximately 2300 Da. This value is significantly higher compared to NF-type membranes, which typically have MWCOs in the range of (200–1000 Da) with pore diameters generally smaller than 2 nm. , The average molecular weight ( M ) of PEG has been correlated to its Stokes diameter d s (nm) using eq − d normals = 33.46 × 10 − 3 × M 0.557 For a PEG M w of 2300 Da, the Stokes diameter is ∼2.5 nm. Consequently, it is estimated that the 16 wt % pTSC membrane, having an MWCO of 2300, has an average pore diameter slightly larger than 2.5 nm.…”

Section: Resultsmentioning

confidence: 99%

Removal of Transition-Metal Ions by Metal-Complexing Polythiosemicarbazone Membranes

Nickisch,

de Vos,

Meier

et al. 2023

ACS Appl. Polym. Mater.

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Membrane technology is one of the many strategies to remove transition-metal ions from aqueous streams because of its relatively lower costs and ease of operation. Typically, adsorbent materials are added into polymeric membranes to impart chelating/complexing properties, but this often results in a limited number of adsorption sites within the membrane. In this work, polythiosemicarbazone (pTSC) is proposed as a material to prepare polymeric membranes due to its metal-complexing ligands in the backbone, providing more adsorption sites. The polymer was easily processed into membranes via the nonsolvent-induced phase separation technique and exhibited asymmetric structures with adequate mechanical strength. The porosity of the membranes was controlled by increasing the polymer concentration in the casting solution, leading to ultrafiltration- and nanofiltration-type membranes with permeabilities ranging from 30 to 0.7 L·m–2·h–1·bar–1. The resulting pTSC membranes were applied for the removal of silver and copper ions in batch and, in the case of silver ions, also in dynamic adsorption experiments. The maximum removal rate of 17 mg·g–1 for silver and 3.8 mg·g–1 for copper ions was obtained in the batch removal experiment. Streaming potential, pH measurements, and infrared spectroscopy (FTIR) were conducted to verify the anionic binding of TSC groups, while neutral binding modes were revealed by FTIR and batch removal experiments. Furthermore, the removal of silver ions was also successfully demonstrated in a flow setup operated at 4 bar of applied pressure. The streaming potential and energy-dispersive X-ray (EDX) spectroscopy conducted on the membranes after the flow tests confirmed the complexation by TSC-functional groups as the separation mechanism. Finally, partial desorption of the silver ions was successfully conducted in water to demonstrate the reusability of pTSC membranes.

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Section: Resultsmentioning

confidence: 99%

Removal of Transition-Metal Ions by Metal-Complexing Polythiosemicarbazone Membranes

Nickisch,

de Vos,

Meier

et al. 2023

ACS Appl. Polym. Mater.

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“…Consequently, the foulants may penetrate more easily into the pores and cause a more severe flux decline due to the pore blocking phenomenon [ 46 ]. These observations may suggest that the average pore size does not solely determine the SiO 2 particle rejection efficiency of the SPS membrane, and the presence of a narrow pore size distribution also appears to play a significant role in influencing the separation performance [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…Thus, it was decided to investigate the possibility of improving the separation performance of the UF membranes by producing a narrower pore size distribution. Chung et al [ 47 ] suggested a method to reduce the pore size distribution of the ceramic membranes by packing nanosized particles into the pre-existing pores of the membrane, following a calcination process to enhance the mechanical strength of the membranes. In this work, a similar approach was utilized to fill the larger pores in the UF-2P and UF-4P membranes.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study of the Self-Cleaning and Filtration Performance of Suspension Plasma-Sprayed TiO2 Ultrafiltration and Microfiltration Membranes

Alebrahim,

Moreau

2023

Membranes

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This study investigated the performance of photocatalytic titanium dioxide microfiltration membranes with an average pore size of approximately 180 nm and ultrafiltration membranes with an average pore size of around 40 nm fabricated with the suspension plasma spray process. The membranes were evaluated for their filtration performance using SiO2 particles of different sizes and polyethylene oxide with molecular weights of 20 kDa to 1000 kDa, and the fouling parameters were characterized. The rejection rate was enhanced by increasing the thickness of the membranes. This effect was more pronounced with the ultrafiltration membranes. The rejection rate of the ultrafiltration membrane was improved significantly after filling the larger pores on the surface with agglomerates of titanium dioxide nanoparticles. The self-cleaning performance of the membranes was assessed under visible light. Both ultrafiltration and microfiltration membranes showed a flux recovery under visible light illumination due to the photocatalytic activity of titanium dioxide. The membranes also show a flux recovery of more than 90%.

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“…A series of studies have also revealed that the comprehensive elimination of atrazine from synthetic surface water can be accomplished while maintaining steady treatment performance. Chung et al 21 conducted another work in which they demonstrated a simple and unique approach for creating ceramic nanofiltration membranes; in this study, they use a precise and tunable molecular weight cut‐off (MWCO) by packing variably sized nanoparticles into existing membrane pores. After the filtration‐coating process, ceramic membranes with MWCO values ranging from 1000 to 10,000 Da were successfully manufactured with a narrow range of pore sizes.…”

Section: Introductionmentioning

confidence: 99%

Ceramic membrane filtration of water samples from Ain Fayda Lake and cement factory (Al‐Ain), United Arab Emirates

Saibi,

Arata,

Kazuyuki

et al. 2023

Env Prog and Sustain Energy

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This article presents a Ceramic Membrane‐based Produced Water Treatment Technology and its application to water samples from Al‐Ain (Abu Dhabi Emirate, United Arab Emirates). The samples were collected during the summer of 2022 from Ain Fayda (lake water) and Al‐Ain cement factory (groundwater). This study investigates the effectiveness of the ceramic membrane for treating water samples and removing solid particles. A dead‐end filtration mode with a filtration flux of 3 m3/m2/d was used. For the Ain Fayda Lake water sample, the transmembrane pressure during filtration reached 120 kPa (temperature adjusted to 25°C); air blowing was used to reduce the transmembrane pressure to around 70 kPa and Total Suspended Solids were reduced from 1.4 to <1 mg/L during 160 min of filtration. For the Al‐Ain cement factory water sample, the transmembrane pressure during filtration reached 160 kPa (temperature adjusted to 25°C); air blowing reduced the transmembrane pressure to around 65 kPa and the Total Suspended Solids from 9.1 to <1 mg/L during 130 min of filtration. Both water samples belong to the Na‐Cl water type. Overall, this work shows the effectiveness of the Ceramic Membrane‐based Produced Water Treatment Technology for reducing Total Suspended Solids in sampled waters; thus, we recommend this approach for treating surface waters in Al‐Ain to improve the environment and possible usage in agriculture.

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Novel method for the facile control of molecular weight cut-off (MWCO) of ceramic membranes

Cited by 20 publications

References 40 publications

Removal of Transition-Metal Ions by Metal-Complexing Polythiosemicarbazone Membranes

Removal of Transition-Metal Ions by Metal-Complexing Polythiosemicarbazone Membranes

A Comparative Study of the Self-Cleaning and Filtration Performance of Suspension Plasma-Sprayed TiO2 Ultrafiltration and Microfiltration Membranes

Ceramic membrane filtration of water samples from Ain Fayda Lake and cement factory (Al‐Ain), United Arab Emirates

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