Mechanistic aspects for the enhanced adsorption of bromophenol blue and atrazine over cyclodextrin modified polyacrylonitrile nanofiber membranes

Chabalala, Mandla B.; Al‐Abri, Mohammed; Mamba, Bhekie B.; Nxumalo, Edward N.

doi:10.1016/j.cherd.2021.02.010

Cited by 46 publications

(21 citation statements)

References 71 publications

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“…The nanofiber showed >90% removal for all the CECs in a flowthrough system with 30 mg/g and 20 mg/g as the uptake capacities of atrazine and sulfamethoxazole, respectively. Chabalala et al (2021) [122] investigated PAN nanofiber modification with β-cyclodextrin (β-CD) to enhance the percentage removal of 10 mg/L atrazine from 51% for PAN nanofibers to 91.46% for PAN-CD nanofibers. The enhanced removal was reported to be caused due to the increased specific surface area (the average diameter was reduced to 497 nm for PAN-CD nanofibers compared to 557 nm for PAN nanofibers) and intermolecular interaction and complexation between atrazine and incorporated β-CD in PAN-CD nanofibers.…”

Section: Cec Removalmentioning

confidence: 99%

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

et al. 2021

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In the past few decades, the role of nanotechnology has expanded into environmental remediation applications. In this regard, nanofibers have been reported for various applications in water treatment and air filtration. Nanofibers are fibers of polymeric origin with diameters in the nanometer to submicron range. Electrospinning has been the most widely used method to synthesize nanofibers with tunable properties such as high specific surface area, uniform pore size, and controlled hydrophobicity. These properties of nanofibers make them highly sought after as adsorbents, photocatalysts, electrode materials, and membranes. In this review article, a basic description of the electrospinning process is presented. Subsequently, the role of different operating parameters in the electrospinning process and precursor polymeric solution is reviewed with respect to their influence on nanofiber properties. Three key areas of nanofiber application for water treatment (desalination, heavy-metal removal, and contaminant of emerging concern (CEC) remediation) are explored. The latest research in these areas is critically reviewed. Nanofibers have shown promising results in the case of membrane distillation, reverse osmosis, and forward osmosis applications. For heavy-metal removal, nanofibers have been able to remove trace heavy metals due to the convenient incorporation of specific functional groups that show a high affinity for the target heavy metals. In the case of CECs, nanofibers have been utilized not only as adsorbents but also as materials to localize and immobilize the trace contaminants, making further degradation by photocatalytic and electrochemical processes more efficient. The key issues with nanofiber application in water treatment include the lack of studies that explore the role of the background water matrix in impacting the contaminant removal performance, regeneration, and recyclability of nanofibers. Furthermore, the end-of-life disposal of nanofibers needs to be explored. The availability of more such studies will facilitate the adoption of nanofibers for water treatment applications.

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Section: Cec Removalmentioning

confidence: 99%

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

et al. 2021

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“…The minimum dye removal was observed at initial concentration of 50 mg/L while the maximum adsorption was recorded at 10 mg/L. The reason being that, at high concentration, the ratio of available adsorption sites to dye pollutants was low, hence the observed low dye removal 19 . Thus, increasing the dye concentrations increases dye molecules per unit area of the adsorbent, therefore, adsorption equilibrium is reached before the adsorption of all the dye molecules.…”

Section: Resultsmentioning

confidence: 94%

“…The pH of a solution influences the physicochemical interactions between the adsorbent and adsorbate 1,19 . In Figure 4, it is apparent that the removal of congo red by the adsorbents was dependent on the pH and the maximum adsorption was obtained at pH 7.…”

Section: Resultsmentioning

confidence: 99%

Beta cyclodextrin modified polyvinylidene fluoride adsorptive mixed matrix membranes for removal of Congo red

Ndlovu

Malatjie

Chabalala

et al. 2022

J of Applied Polymer Sci

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This work reports the adsorptive removal of congo red using as-fabricated polyvinylidene fluoride (PVDF) membranes modified with beta cyclodextrin (β-CD). Diverse techniques were used to characterize the membranes' performance and microstructural and morphological properties. The effect of pH, dye initial concentration, adsorbent dosage, contact time on adsorption efficiency were investigated. Filtration studies were carried out using a deadend cell. The results showed that the introduction of β-CD in membrane matrix improved membrane performance, adsorption, and filtration properties.Bulk porosity increased from 61.46% to 87.55% and contact angle decreased from 84.17 0 to 67.93 0 . Water flux at 1 bar improved from 12.42 to 269.08 L.m À2 . hr À1 . Maximum adsorption for congo red was obtained at pH 7, with PVDF/β-CD membranes removing 96.15% and pristine PVDF removing 54.27% of congo red. The adsorptive removal of congo red was best described by the pseudosecond order kinetics and best fitted the Freundlich isotherm model. According

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“…It was observed that when the diameter is decreased from 557 nm to 497 nm, in the case of CD-PAN, the specific surface area increases [140]. Additionally, the synergistic effect of hydrophobic interaction and hydrogen bonding influences the removal process in the case of CD-PES [181][182][183].…”

Section: Polymersmentioning

confidence: 99%

“…Adsorption [181] Electrospun PAN nanofiber membranes modified with β-cyclodextrin (β-CD) crosslinked with citric acid. Method: PAN and PAN-CD (ratio 80:20) prepared in DMF solution, 12 h at room temperature.…”

Section: Type Of Processmentioning

confidence: 99%

Multifunctional Membranes—A Versatile Approach for Emerging Pollutants Removal

et al. 2022

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This paper presents a comprehensive literature review surveying the most important polymer materials used for electrospinning processes and applied as membranes for the removal of emerging pollutants. Two types of processes integrate these membrane types: separation processes, where electrospun polymers act as a support for thin film composites (TFC), and adsorption as single or coupled processes (photo-catalysis, advanced oxidation, electrochemical), where a functionalization step is essential for the electrospun polymer to improve its properties. Emerging pollutants (EPs) released in the environment can be efficiently removed from water systems using electrospun membranes. The relevant results regarding removal efficiency, adsorption capacity, and the size and porosity of the membranes and fibers used for different EPs are described in detail.

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Mechanistic aspects for the enhanced adsorption of bromophenol blue and atrazine over cyclodextrin modified polyacrylonitrile nanofiber membranes

Cited by 46 publications

References 71 publications

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

Beta cyclodextrin modified polyvinylidene fluoride adsorptive mixed matrix membranes for removal of Congo red

Multifunctional Membranes—A Versatile Approach for Emerging Pollutants Removal

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