Functionalized chitosan electrospun nanofiber membranes for heavy-metal removal

Yang, Dongxue; Li, Lingfeng; Chen, Binling; Shi, Shuxian; Nie, Jun; Ma, Guiping

doi:10.1016/j.polymer.2018.12.046

Cited by 191 publications

(79 citation statements)

References 49 publications

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“…The removal was conducted primarily based on the chemical adsorption mechanism. This result in the removal of Cu 2+ ion was higher than the CTS membrane (25.6 mg g −1 ) [ 96 ], the thiol-functionalized cellulose (TC) membrane (49.0 mg g −1 ) [ 98 ], and the PEI/CTS membrane (69.3 mg g −1 ) [ 99 ]. The removal of Pb 2+ ion was also better than both the TC membrane (22.0 mg g −1 ) [ 98 ] and the PAN/CTS membrane (240.0 mg g −1 ) [ 100 ] (Table 2 ).…”

Section: Applications Of Ams In Heavy Metal Removalmentioning

confidence: 99%

Heavy metal removal applications using adsorptive membranes

et al. 2020

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Water is a significant natural resource for humans. As such, wastewater containing heavy metals is seen as a grave problem for the environment. Currently, adsorption is one of the common methods used for both water purification and wastewater treatment. Adsorption relies on the physical and chemical interactions between heavy metal ions and adsorbents. Adsorptive membranes (AMs) have demonstrated high effectiveness in heavy metal removal from wastewater owing to their exclusive structural properties. This article examines the applications of adsorptive membranes such as polymeric membranes (PMs), polymer-ceramic membranes (PCMs), electrospinning nanofiber membranes (ENMs), and nano-enhanced membranes (NEMs), which demonstrate high selectivity and adsorption capacity for heavy metal ions, as well as both advantages and disadvantages of each one all, are summarized and compared shortly. Moreover, the general theories for both adsorption isotherms and adsorption kinetics are described briefly to comprehend the adsorption process. This work will be valuable to readers in understanding the current applications of various AMs and their mechanisms in heavy metal ion adsorption, as well as the recycling methods in heavy ions desorption process are summarized and described clearly. Besides, the influences of morphological and chemical structures of AMs are presented and described in detail as well.

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Section: Applications Of Ams In Heavy Metal Removalmentioning

confidence: 99%

Heavy metal removal applications using adsorptive membranes

et al. 2020

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“…Many techniques have been employed to remove heavy metals from wastewaters, such as biological treatment, chemical precipitation, ion exchange, and membrane technique and so on. However, these techniques are not perfect, problems such as complicated operation, low efficiency, and relatively high costs have limited its application.…”

Section: Introductionmentioning

confidence: 99%

Binary adsorption of Cu(II) and Ni(II) on Lai'yang bentonite: Kinetics, equilibrium, competition quantitative and mechanisms investigation

Xiao

Cao

Lyu

et al. 2019

Env Prog and Sustain Energy

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In this study, the competitive adsorption of Cu(II) and Ni(II) adsorption onto bentonite were investigated. The effects of initial adsorbate concentration, pH, contact time, temperature on adsorption and the kinetics, thermodynamic, quantification of adsorption competition and competitive mechanisms have been studied. The results indicated that Cu(II) has a higher affinity than Ni(II) for adsorption on bentonite. But the inhibition effect was not noticeable under alkaline conditions. The Langmuir and pseudo-second-order kinetics models can be applied to simulate the isothermal adsorption and adsorption dynamic, respectively. Under a single system/binary system, the maximum adsorption capacity of bentonite for Cu(II) and Ni(II) is 12.76/10.57 and 11.12/9.11 mg/g, respectively. The equilibrium adsorption capacity reduction rate is suitable for quantitative characterization of adsorption competition under any concentration conditions; adsorption competition coefficient is more suitable for low concentration adsorption; although the distribution coefficient is not suitable for quantitative adsorption competition at high concentrations, it can be used to characterize the variation of adsorption competitiveness of Cu(II) at different concentrations. The higher electronegativity, lower first hydrolysis constant and Misono softness, and a better "guest-host" consistency between Cu(II)O 6 and the vacancies in the montmorillonite octahedral sheet make the higher affinity of Cu(II) to bentonite and result in the possible ion exchange between Cu(II) in solution and adsorbed Ni(II). In addition, at high concentrations, Cu(II) and Ni(II) precipitates formed on the surface of montmorillonite may cause remained Cu(II) ions in the solution unable to enter the internal space of the montmorillonite octahedron. K E Y W O R D S nickel, copper, bentonite, quantification of adsorption competition, mechanisms

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“…A high surface-to-volume ratio, and large numbers of cysteine groups with binding affinities to heavy metals, are a significant cause of the high metal-removal capacity. Heavy metal ions such as Cr(VI), Co(III), and Cu(II) were efficiently removed with good stability and reproducibility, using a chitosan-based nanofiber membrane [43]. Modification of the chitosan surface as a rich amino-functionalized chitosan membrane by grafting of polyglycidyl methacrylate (PGMA) and polyethylenimine (PEI) effectively improves the removal ability of the ENM.…”

Section: The Role Of Nanomaterials For Effective Pollutant Removalmentioning

confidence: 99%

Nanomaterials: Solutions to Water-Concomitant Challenges

et al. 2019

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Plenty of fresh water resources are still inaccessible for human use. Calamities such as pollution, climate change, and global warming pose serious threats to the fresh water system. Although many naturally and synthetically grown materials have been taken up to resolve these issues, there is still plenty of room for enhancements in technology and material perspectives to maximize resources and to minimize harm. Considering the challenges related to the purification of water, materials in the form of nanofiber membranes and nanomaterials have made tremendous contributions to water purification and filtration. Nanofiber membranes made of synthetic polymer nanofibers, ceramic membranes etc., metal oxides in various morphologies, and carbonaceous materials were explored in relation to waste removal from water. In this review, we have discussed a few key materials that have shown effectiveness in removing pollutants from waste water, enabling solutions to existing problems in obtaining clean drinking water.

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Functionalized chitosan electrospun nanofiber membranes for heavy-metal removal

Cited by 191 publications

References 49 publications

Heavy metal removal applications using adsorptive membranes

Heavy metal removal applications using adsorptive membranes

Binary adsorption of Cu(II) and Ni(II) on Lai'yang bentonite: Kinetics, equilibrium, competition quantitative and mechanisms investigation

Nanomaterials: Solutions to Water-Concomitant Challenges

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