RETRACTED: Cross-linked β-cyclodextrin nanofiber composite membrane for steroid hormone micropollutant removal from water

Khalil, Alaa; Schäfer, A.I.

doi:10.1016/j.memsci.2020.118228

Cited by 45 publications

(34 citation statements)

References 76 publications

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“…The 20 mg catalyst showed the best photodegradation efficiency in 7 min. This behavior is due to the increase in the number of active sites and the high surface area of the nanofiber [35]. Therefore, the increase in electron-hole pairs on the catalyst surface leads to higher amounts of reactive hydroxyl radicals, which can be attributed to better degradation.…”

Section: Photocatalytic Performance Of Composites Nanofibersmentioning

confidence: 99%

Rapid photocatalytic degradation of phenol from water using composite nanofibers under UV

et al. 2020

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Background The removal of phenol from aqueous solution via photocatalytic degradation has been recognized as an environmentally friendly technique for generating clean water. The composite nanofibers containing PAN polymer, CNT, and TiO2 NPs were successfully prepared via electrospinning method. The prepared photocatalyst is characterized by SEM, XRD, and Raman spectroscopy. Different parameters are studied such as catalyst amount, the effect of pH, phenol concentration, photodegradation mechanism, flow rate, and stability of the composite nanofiber to evaluate the highest efficiency of the photocatalyst. Results The composite nanofibers showed the highest photodegradation performance for the removal of phenol using UV light within 7 min. The pH has a major effect on the photodegradation of phenol with its maximum performance being at pH 5. Conclusions Given the stability and flexibility of the composite nanofibers, their use in a dynamic filtration is possible and can be even reused after several cycles.

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Section: Photocatalytic Performance Of Composites Nanofibersmentioning

confidence: 99%

Rapid photocatalytic degradation of phenol from water using composite nanofibers under UV

et al. 2020

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“…The dye concentration decays monotonically and almost vanished in 120 minutes. These results are attributed to the limitation of hydroxyl radicals and the occupation of the active sites [60,61]. Incident photons on NB-TiO2 with quantized energy (ℎ ) equals to or exceeds the excitation energy (Eg), will produce electron-hole pairs.…”

Section: Photocatalytic Degradation Of Mg and Mb Over Nb-tio2 Composimentioning

confidence: 99%

Physical Properties of PVDF-GO/Black-TiO2 Nanofibers and its Photocatalytic Degradation of Methylene Blue and Malachite Green Dyes

Abdelmaksoud

Mohamed

Sayed

et al. 2020

Preprint

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BackgroundBlack TiO2 and Graphene Oxide (GO) have attracted intensive attention as an effective catalyst on visible light driven for photodegrading of dyes. In this study, nano-black TiO2 was prepared by a simple hydrogenation of the anatase titanium oxide and the graphene oxide was prepared by applying the modified Hummers method. The prepared powders and nanofiber membranes are carefully examined to ensure their single phase and compound structure formation as well as to measure the equivalent crystallite size and particle distributions. ResultsThe optimum degradation efficiency of malachite green and methylene blue dyes occurred at pH values of 8 and 10, respectively. Afterwards, at the optimum pH value of 8, for malachite green, the degradation efficiency is peaked at 20 mg of the nano-black TiO2 concentration. Then, a comparison of the degradation efficiency of the two mentioned dyes are performed as the fore-mentioned nanofibers are loaded with 20 mg nano-black TiO2 at the corresponding optimum pH vales. ConclusionsThe diffuse reflectance spectroscopy has been investigated to find out the optical energy gaps of the treated and nano-black samples. Finally, a schematic of the redox reaction mechanism has been proposed.

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“…This membrane can be a typical thin, nonporous, or porous film composed of a metallic or ceramic material or even a gas or liquid [ 37 , 38 ]. One important feature is that the membrane should remain intact without dissolution or cracking in the given medium [ 39 , 40 ]. Typical membrane-based separations for removing fluoride ions include reverse osmosis, nanofiltration, and electrodialysis.…”

Section: Introductionmentioning

confidence: 99%

Efficient Fluoride Removal from Aqueous Solution Using Zirconium-Based Composite Nanofiber Membranes

et al. 2021

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Herein, composite nanofiber membranes (CNMs) derived from UiO-66 and UiO-66-NH2 Zr-metal-organic frameworks (MOFs) were successfully prepared, and they exhibited high performance in adsorptive fluoride removal from aqueous media. The resultant CNMs were confirmed using different techniques, such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Brunauer–Emmett–Teller (BET) in addition to Fourier-transform infrared spectroscopy (FTIR). The parameters that govern the fluoride adsorption were evaluated, including adsorbent dose, contact time, and pH value, in addition to initial concentration. The crystalline structures of CNMs exhibited high hydrothermal stability and remained intact after fluoride adsorption. It could also be observed that the adsorbent dose has a significant effect on fluoride removal at high alkaline values. The results show that UiO-66-NH2 CNM exhibited high fluoride removal due to electrostatic interactions that strongly existed between F− and metal sites in MOF in addition to hydrogen bonds formed with MOF amino groups. The fluoride removal efficiency reached 95% under optimal conditions of 20 mg L−1, pH of 8, and 40% adsorbent dose at 60 min. The results revealed that UiO-66-NH2 CNM possesses a high maximum adsorption capacity (95 mg L−1) over UiO-66 CNM (75 mg L−1), which exhibited better fitting with the pseudo-second-order model. Moreover, when the initial fluoride concentration increased from 20 to 100 mg/L, fluoride adsorption decreased by 57% (UiO-66 CNM) and 30% (UiO-66-NH2 CNM) after 60 min. After three cycles, CNM revealed the regeneration ability, demonstrating that UiO-66-NH2 CNMs are auspicious adsorbents for fluoride from an aqueous medium.

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RETRACTED: Cross-linked β-cyclodextrin nanofiber composite membrane for steroid hormone micropollutant removal from water

Cited by 45 publications

References 76 publications

Rapid photocatalytic degradation of phenol from water using composite nanofibers under UV

Rapid photocatalytic degradation of phenol from water using composite nanofibers under UV

Physical Properties of PVDF-GO/Black-TiO2 Nanofibers and its Photocatalytic Degradation of Methylene Blue and Malachite Green Dyes

Efficient Fluoride Removal from Aqueous Solution Using Zirconium-Based Composite Nanofiber Membranes

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