Porous poly(L–lactic acid)/chitosan nanofibres for copper ion adsorption

Zia, Qasim; Tabassum, Madeeha; Lu, Zihan; Khawar, Muhammad Tauseef; Song, Jun; Gong, Rong; Meng, Jinmin; Li, Zhi; Li, Jiashen

doi:10.1016/j.carbpol.2019.115343

Cited by 93 publications

(44 citation statements)

References 52 publications

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“…Figure 6). The value of Q m obtained is notably higher in comparison with other reported studies (Table S4) [20][21][22][50][51][52][53][54][55][56]. According to the results, CS-Ac-An is described as an adsorbent with incremental surface heterogeneity which is predictable from its chemical structure relative to chitosan [57].…”

Section: Equilibriummentioning

confidence: 44%

Cu(II) Ion Adsorption by Aniline Grafted Chitosan and Its Responsive Fluorescence Properties

Vafakish¹,

Wilson²

2020

Molecules

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The detection and removal of heavy metal species in aquatic environments is of continued interest to address ongoing efforts in water security. This study was focused on the preparation and characterization of aniline grafted chitosan (CS-Ac-An), and evaluation of its adsorption properties with Cu(II) under variable conditions. Materials characterization provides support for the grafting of aniline onto chitosan, where the kinetic and thermodynamic adsorption properties reveal a notably greater uptake (>20-fold) of Cu(II) relative to chitosan, where the adsorption capacity (Qm) of CS-Ac-An was 106.6 mg/g. Adsorbent regeneration was demonstrated over multiple adsorption-desorption cycles with good uptake efficiency. CS-Ac-An has a strong fluorescence emission that undergoes prominent quenching at part per billion levels in aqueous solution. The quenching process displays a linear response over variable Cu(II) concentration (0.05–5 mM) that affords reliable detection of low level Cu(II) levels by an in situ “turn-off” process. The tweezer-like chelation properties of CS-Ac-An with Cu(II) was characterized by complementary spectroscopic methods: IR, NMR, X-ray photoelectron (XPS), and scanning electron microscopy (SEM). The role of synergistic effects are inferred among two types of active adsorption sites: electron rich arene rings and amine groups of chitosan with Cu(II) species to afford a tweezer-like binding modality.

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Section: Equilibriummentioning

confidence: 44%

Cu(II) Ion Adsorption by Aniline Grafted Chitosan and Its Responsive Fluorescence Properties

Vafakish¹,

Wilson²

2020

Molecules

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“…Based on the previous publications, it is clearly explained the acetone treatment theory for PLLA fibres [25,26,54]. At the initial stage of the electrospinning process, the polymer solution jet of DCM/ DMF is homogeneous and has no phase separation.…”

Section: Mechanism Of Pore Formationmentioning

confidence: 99%

“…For the crystallization via an introduced solvent, a specific solvent is applied to destroy the fibre molecule structure and entangle the polymer chains, which can crystallize the polymer to form pores [22][23][24]. Based on our previous published studies, the electrospinning process of poly(l-lactic acid) (PLLA) fibres and the solvent-induced recrystallization of PLLA fibres were well explained [25,26]. Acetone with a similar solubility parameter to PLLA was applied to contribute its recrystallization and swell fibres.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical porous poly(l-lactic acid)/SiO2 nanoparticles fibrous membranes for oil/water separation

Zia

Meng

et al. 2020

J Mater Sci

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A two-step strategy has been developed to introduce silica nanoparticles into highly porous poly(l-lactic acid) (PLLA) nanofibers. Silica nanoparticles (SiNPs) were firstly synthesized and then modified to be hydrophobic. After PLLA/SiNPs composite fibrous membranes were electrospun and collected, they were re-crystallized by acetone at room temperature for a few minutes. With the re-arrangement of PLLA chains, the nano-/micro-electrospun fibres were transformed from non-porous ones to be porous ones with high surface area. Consequently, SiNPs that were completely covered by PLLA before acetone treatment showed up at the fibre surface. Higher PLLA crystallization also enhanced the Young’s modulus and tensile strength (420 and 8.47 MPa) of the composite membrane. However, incorporation of SiNPs into porous PLLA membranes reduced their modulus and tensile strength (280.66 and 5.92 MPa), but an increase in strain to fracture (80.82%) was observed. Scanning electron microscopy (SEM), focused ion beam SEM, transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction were applied to confirm the presence of SiNP in PLLA fibres. The presence of SiNPs inside and outside fibres enhances the hydrophobicity of PLLA/SiNPs nano-fibrous membrane as the water contact angle is greater than 150°. The oil absorption of these porous composite membranes was also tested using four different oils, which can reach the highest absorption capacity when the weight ratio of PLLA and SiNPs is 1:1. The flux of prepared membranes was investigated, and results indicated that SiNPs-loaded membrane effectively enhanced the flux (5200 Lm−2 h−1).

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“…Various approaches involving chemical precipitation, coagulation, bioremediation, electrodeposition, and physical/chemical adsorption have been explored and developed 13–18 . Among these technologies, adsorption using a 3D porous cryogel as the adsorbent matrix for the removal of heavy metals has attracted increasing attention thanks to multiple advantages of excellent mechanical strength, operation simplicity, and low cost 12,19–24 .…”

Section: Introductionmentioning

confidence: 99%

Microfibrillated cellulose reinforced poly(vinyl imidazole) cryogels for continuous removal of heavy metals

Zhang

Zhong

Xiang

et al. 2021

J of Applied Polymer Sci

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Interconnected macro‐porous cryogels with robust mechanical structure and high adsorption capacity are desirable for the wastewater clean‐up. However, some functional alkenyl‐based monomer such as vinyl imidazole (VIM) could not be individually polymerized to form the cryogel with a robust structure for applications. Herein, a strategy has been developed to fabricate the poly(VIM) cryogel using microfibrillated cellulose (MFC) as reinforcing agent. Structural characterizations indicated that the poly(VIM)/MFC showed interconnected macropores of 12 ± 10 μm and high VIM contents. Underwater compression experiments displayed that the hysteresis loops changed slightly and the energy loss coefficients were less than 23% during loading‐unloading 200 cycles, highlighting the excellent shape recovery and fatigue resistance. Batch adsorption indicated that the adsorption capacities of the poly(VIM)/MFC cryogel to Cu(II), Pb(II), Zn(II), Cd(II), Ni(II), and Co(II) were 87.4, 53.9, 48.6, 44.3, 23.8, and 20.1 mg/g, respectively. The pseudo second‐order kinetic and Langmuir model can fit the adsorption process well, confirming the single‐layer homogeneous chemisorption. Dynamic adsorption displayed that the loaded Cu(II) ions could be rapidly adsorbed and hardly flow through the poly(VIM)/MFC cryogel, indicating the extremely fast adsorption at the flow mode. This study shows a novel strategy to fabricate the robust cryogel for environmental remediation.

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Porous poly(L–lactic acid)/chitosan nanofibres for copper ion adsorption

Cited by 93 publications

References 52 publications

Cu(II) Ion Adsorption by Aniline Grafted Chitosan and Its Responsive Fluorescence Properties

Cu(II) Ion Adsorption by Aniline Grafted Chitosan and Its Responsive Fluorescence Properties

Hierarchical porous poly(l-lactic acid)/SiO2 nanoparticles fibrous membranes for oil/water separation

Microfibrillated cellulose reinforced poly(vinyl imidazole) cryogels for continuous removal of heavy metals

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