Covalent organic frameworks modified with TA embedded in the membrane to improve the separation of heavy metals in the FO

Vafaei, Mohammad Ali; Farniya, Seyed Morteza Famil; Shakeri, Alireza

doi:10.1016/j.surfin.2023.102963

Cited by 3 publications

(2 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…141 The adsorption capacity of CM@COF was found to be 122 mg g −1 for copper and 388 mg g −1 for chromium. 141 In other studies, tannic acid modified COF embedded FO membranes 142 and interlaced-stacked COF/polysulfonamide NF membranes 143 144 The as-prepared MMMs achieved 99% uranium removal with an adsorption capacity of 99.4 mg g −1 (at pH = 1). 144 In general, irrespective of COF type, incorporating a COF into a membrane matrix results in better removal of pollutants.…”

Section: Evaluating Cof Membranes In Water Treatmentmentioning

confidence: 87%

“…141 The adsorption capacity of CM@COF was found to be 122 mg g −1 for copper and 388 mg g −1 for chromium. 141 In other studies, tannic acid modified COF embedded FO membranes 142 and interlaced-stacked COF/polysulfonamide NF membranes 143 have been reported to achieve efficient removal (90−99%) of metals (such as lead, copper, and nickel) and rare-earth metals (such as lanthanum, neodymium, and yttrium), respectively. Wu et al developed MMMs containing [NH 4 ] + [COF−SO 3− ] and sulfonated-poly(ether sulfone) for the uranium extraction.…”

Section: Evaluating Cof Membranes In Water Treatmentmentioning

confidence: 99%

See 1 more Smart Citation

Covalent Organic Framework Membranes and Water Treatment

Asif,

Kim,

Nguyen

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

Covalent organic frameworks (COFs) are an emerging class of highly porous crystalline organic polymers comprised entirely of organic linkers connected by strong covalent bonds. Due to their excellent physicochemical properties (e.g., ordered structure, porosity, and stability), COFs are considered ideal materials for developing state-of-the-art separation membranes. In fact, significant advances have been made in the last six years regarding the fabrication and functionalization of COF membranes. In particular, COFs have been utilized to obtain thin-film, composite, and mixed matrix membranes that could achieve effective rejection (mostly above 80%) of organic dyes and model organic foulants (e.g., humic acid). COF-based membranes, especially those prepared by embedding into polyamide thin-films, obtained adequate rejection of salts in desalination applications. However, the claims of ordered structure and separation mechanisms remain unclear and debatable. In this perspective, we analyze critically the design and exploitation of COFs for membrane fabrication and their performance in water treatment applications. In addition, technological challenges associated with COF properties, fabrication methods, and treatment efficacy are highlighted to redirect future research efforts in realizing highly selective separation membranes for scale-up and industrial applications.

show abstract

Section: Evaluating Cof Membranes In Water Treatmentmentioning

confidence: 87%

“…141 The adsorption capacity of CM@COF was found to be 122 mg g −1 for copper and 388 mg g −1 for chromium. 141 In other studies, tannic acid modified COF embedded FO membranes 142 and interlaced-stacked COF/polysulfonamide NF membranes 143 have been reported to achieve efficient removal (90−99%) of metals (such as lead, copper, and nickel) and rare-earth metals (such as lanthanum, neodymium, and yttrium), respectively. Wu et al developed MMMs containing [NH 4 ] + [COF−SO 3− ] and sulfonated-poly(ether sulfone) for the uranium extraction.…”

Section: Evaluating Cof Membranes In Water Treatmentmentioning

confidence: 99%

Covalent Organic Framework Membranes and Water Treatment

Asif,

Kim,

Nguyen

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

show abstract

In‐situ generated ZnO nanoparticles for enhanced performance of thin film nanocomposite membrane in forward osmosis process

Hakimi,

Shakeri,

Salehi

2023

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

This work developed a novel approach to the in‐situ synthesis of ZnO nanoparticles to modify the polysulfone (PSf) porous membrane substrate. The zinc acetate was added to the casting solution, and ZnO nanoparticles were synthesized during phase inversion. The non‐solvent pH and zinc acetate concentration controlled the ZnO synthesis and loading. Their effect on the substrates properties in terms of morphology, hydrophilicity and porosity was studied thoroughly. The result shows that the ZnO nanoparticles was not formed in acidic pH, while ZnO nanoparticles with size of 20 nm could be easily formed in basic pH. The successful synthesis of ZnO nanoparticles was investigated using FTIR and EDX analysis. The EDX images verify that in‐situ synthesis led to a more uniform dispersion than conventional incorporation method. Then the effect of ZnO loading on the interfacial reaction and polyamide (PA) structure was investigated. SEM images verify the successful synthesis of a uniform and defect‐free PA thin film on ZnO modified substrates. FO performance results show an enhancement in water flux and salt rejection as a result of ZnO incorporation in thin film nanocomposite (TFN) membranes, where TFN 1 wt.% in‐situ membrane showed 40% higher water flux than the control TFC membrane. The porous and hydrophile substrate in TFN 1 wt.% in‐situ membrane is responsible for improved separation performance. These modified membranes displayed uniform dispersion of ZnO nanoparticles within substrates, confirming that this method could effectively restrain the aggregation of the nanoparticles.

show abstract