Electrostatic self-assembly of nanoscale FeS onto MXenes with enhanced reductive immobilization capability for U(VI) and Cr(VI)

Liu, Fenglei; Wang, Shanshan; Hu, Baowei

doi:10.1016/j.cej.2022.141100

Cited by 98 publications

(8 citation statements)

References 45 publications

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“…39,40 Besides, compared to strong reductants like NaBH 4 (a control group was conducted using NaBH 4 as the reductant, Figure S1), PDA provides a milder and more controllable reduction rate. 41 The PDA layer could also act as a template and stabilizing layer, facilitating the nucleation and growth of metal nanoparticles and enhancing the uniformity of the deposited nanoparticles. Moreover, because the formation of the PDA layer could be triggered by a self-polymerization process from dopamine solutions in normal temperature and pressure, as well as the reducing strength of the PDA layer was proportionate to the extent of the self-polymerization process, 42,43 the reducing capacity of the PVDF−PDA could be conveniently maneuvered by controlling the self-polymerization time of the PDA.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Unveiling the Dual-Enhancing Mechanisms of Kinetically Controlled Silver Nanoparticles on Piezoelectric PVDF Nanofibers for Optimized SERS Performance

Xu,

Li,

Liao

et al. 2024

ACS Sens.

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Noble metal nanoparticle (NMP)-based composite substrates have garnered significant attention as a highly promising technique for surface-enhanced Raman scattering (SERS) in diverse scientific disciplines because their remarkable ability to amplify and functionalize Raman signals has positioned them as valuable tools for molecular detection. However, optimizing the size and distribution of NMPs has not received sufficient emphasis because of challenges associated with the precise control of deposition and the modulation of reducing rates during growth. In this research, we achieved the optimized size and spatial patterns of AgNWs on electrospun poly(vinylidene fluoride) (PVDF) nanofibers by utilizing a polydopamine (PDA) layer as a mild and controllable reduction mediator, by which the size and density of the AgNWs could be relatively precisely manipulated, achieving a dense distribution of effective "hot spots". On the other hand, harnessing the inherent piezoelectric properties of the electrospun PVDF nanofibers further boosted the LSPR effect during the SERS test, forming a flexible dual-enhancing composite SERS substrate with excellent sensitivity. In addition to addressing structural aspects, exploiting synergistic systems capable of transferring external energy or forces to enhance the SERS performances presents a compelling avenue to broaden the practical applications of SERS. The dual-enhanced substrate achieved an exceptional enhancement factor (EF) of 1.05 × 10 8 and a low detection limit (LOD) of 10 −10 M during the SERS test. This study focuses on integrating NMPs with electrospun piezoelectric polymer nanofibers to develop a dual-enhancing SERS substrate with excellent sensitivity and practicality. The findings provide valuable insights into controllably depositing NMPs on electrospun polymer fibers and hold significant implications for the development of highly sensitive and practical SERS substrates across various applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Unveiling the Dual-Enhancing Mechanisms of Kinetically Controlled Silver Nanoparticles on Piezoelectric PVDF Nanofibers for Optimized SERS Performance

Xu,

Li,

Liao

et al. 2024

ACS Sens.

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“…This high adsorption capacity is due to the strong electrostatic attraction between the adsorbent material and Cr( vi ) ions. Liu et al 216 prepared FeS/MXene nanocomposite using the self-assembled method to decontaminate Cr( vi ) ions from aquatic environments. Meanwhile, the prepared FeS/MXene nanocomposite showed exceptional adsorption capacity (107.2 mg g −1 ) for Cr( vi ) ions at pH 1.…”

Section: Applications Of Mxene-based Nanocompositesmentioning

confidence: 99%

MXene-based nanocomposites: emerging candidates for the removal of antibiotics, dyes, and heavy metal ions

Ali¹,

Ali²,

Buledi³

et al. 2023

Mater. Chem. Front.

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“…Besides these conventional adsorption methodologies, there is also great interest in investigating the removal of toxic chromium(VI) from solutions via reduction to the less harmful chromium(III) oxidation state. Among the adsorbents used for this purpose, published investigations have used: nanozerovalent iron in a nonaqueous medium [ 25 ], nanozerovalent iron particles immobilized on Mbenes [ 26 ], nanozerovalent iron-rgGO hybrids [ 27 ], nanoscale FeS assembled onto MXenes [ 28 ], Cu 2 ZnSnS 4 (containing Ag or Au) nanocrystals [ 29 ], and sulphonated polymers [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Transport of Chromium(VI) across a Supported Liquid Membrane Containing Cyanex 921 or Cyanex 923 Dissolved in Solvesso 100 as Carrier Phase: Estimation of Diffusional Parameters

Robla

2023

Membranes

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An investigation of chromium(VI) transport across a supported liquid membrane containing the phosphine oxides Cyanex 921 and Cyanex 923 dissolved in Solvesso 100 as carrier phases was carried out in batch operation mode. Chromium(VI) transport was investigated as a function of different variables: hydrodynamic conditions in the feed (1000–1600 min−1) and stripping (600–1500 min−1) phases, HCl (0.25–2 M) and indium (0.01–0.1 g/L) concentrations in the feed phase, and carrier (0.01 M–0.75 M) concentration in the membrane phase. Indium was recovered in the stripping phase using hydrazine sulphate solutions, and, at the same time, chromium(VI) was reduced to the less harmful Cr(III) oxidation state. Models describing the transport mechanism comprising a diffusion process through the feed aqueous diffusion layer, fast interfacial chemical reaction, and diffusion of the respective chromium(VI)–phosphine oxide complexes across the membrane were developed. The equations describing the rate of transport correlate the membrane permeability coefficient with diffusion and equilibrium parameters, as well as the chemical compositions of the respective metal–carrier phases. The models were used to calculate diffusional parameters for each metal–carrier system, and the minimum thickness of the feed boundary layer was calculated as 1 × 10−3 cm and 6.3 × 10−4 cm for the Cr(VI)-Cyanex 921 and Cr(VI)-Cyanex 923 systems, respectively.

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Electrostatic self-assembly of nanoscale FeS onto MXenes with enhanced reductive immobilization capability for U(VI) and Cr(VI)

Cited by 98 publications

References 45 publications

Unveiling the Dual-Enhancing Mechanisms of Kinetically Controlled Silver Nanoparticles on Piezoelectric PVDF Nanofibers for Optimized SERS Performance

Unveiling the Dual-Enhancing Mechanisms of Kinetically Controlled Silver Nanoparticles on Piezoelectric PVDF Nanofibers for Optimized SERS Performance

MXene-based nanocomposites: emerging candidates for the removal of antibiotics, dyes, and heavy metal ions

Transport of Chromium(VI) across a Supported Liquid Membrane Containing Cyanex 921 or Cyanex 923 Dissolved in Solvesso 100 as Carrier Phase: Estimation of Diffusional Parameters

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