Arsenic(V) removal on the lanthanum-modified ion exchanger with quaternary ammonium groups based on iron oxide

Dudek, Sebastian; Kołodyńska, Dorota

doi:10.1016/j.molliq.2021.117985

Cited by 27 publications

(6 citation statements)

References 54 publications

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“…Successful modification was confirmed by XPS analysis and the FTIR spectra. The signal at 403.2 eV corresponded to the N 1s spectrum of quaternary ammonium (−N + (CH 3 ) 3 ) (Figure d), while no N 1s spectrum peak was observed for the cathode that was only modified by MWCNT-COOH. , The XPS spectra of F 1s and N 1s of the modified cathodes after electrochemical reaction are shown in Figures S4 and S5. The spectral counts of 1465.0 cm –1 contributed to quaternary ammonium, which also implied the successful loading of OTAB (Figure e) …”

Section: Resultsmentioning

confidence: 99%

Electroreductive Defluorination of Unsaturated PFAS by a Quaternary Ammonium Surfactant-Modified Cathode via Direct Cathodic Reduction

Wang

Xiao

Lin

et al. 2023

Environ. Sci. Technol.

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Remediation of per- and polyfluoroalkyl substances (PFAS) in groundwater remains a technological challenge due to the trace concentrations of PFAS and the strength of their C–F bonds. This study investigated an electroreductive system with a quaternary ammonium surfactant-modified cathode for degrading (E)-perfluoro(4-methylpent-2-enoic acid) (PFMeUPA) at a low cathodic potential. A removal efficiency of 99.81% and defluorination efficiency of 78.67% were achieved under −1.6 V (vs Ag/AgCl) at the cathode modified by octadecyltrimethylammonium bromide (OTAB). The overall degradation procedure started with the adsorption of PFMeUPA onto the modified cathode. This adsorption process was promoted by hydrophobic and electrostatic interactions between the surfactants and PFMeUPA, of which the binding percentage, binding mode, and binding energy were determined via molecular dynamics (MD) simulations and density functional theory (DFT) calculations. The step-wise degradation pathway of PFMeUPA, including reductive defluorination and hydrogenation, was derived. Meanwhile, C–F bond breaking with direct electron transfer only was achieved for the first time in this study, which also showed that the CC bond structure of PFAS facilitates the C–F cleavage. Overall, this study highlights the crucial role of quaternary ammonium surfactants in electron transfer and electrocatalytic activities in the electroreductive system and provides insights into novel remediation approaches on PFAS-contaminated groundwater.

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Section: Resultsmentioning

confidence: 99%

Electroreductive Defluorination of Unsaturated PFAS by a Quaternary Ammonium Surfactant-Modified Cathode via Direct Cathodic Reduction

Wang

Xiao

Lin

et al. 2023

Environ. Sci. Technol.

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“…The peaks located between 1000 and 1250 cm −1 , as well as those at 798 cm −1 , assigned to the stretching mode of Si-OH and Si-O-Si in silica [ 24 ], respectively, indicating that the silicon layers were successfully coated on the surface of Fe 3 O 4 by the sol-gel method. In addition, a new peak at 1479 cm −1 is assigned to the asymmetric bending modes of the head N-(CH 3 ) 3 methyl group, which is caused by the introduction of quaternary ammonium in the Fe 3 O 4 @SiO 2 @N(CH 3 ) 3 + [ 20 , 25 ]. Meanwhile, the declining peak intensity of Fe-O and Si-O-Si in Fe 3 O 4 @SiO 2 @N(CH 3 ) 3 + demonstrates the successful aggregations of quaternary ammonium onto the Fe 3 O 4 @SiO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…In the next step, 5 mL Fe 3 O 4 @SiO 2 , 150 mL anhydrous ethanol, 25 mL distilled water, 1 mL N-[3-(Trimethoxysilyl)propyl]-N,N,N-trimethylammonium chloride, 2 mL TEOS and 7.5 mL ammonium hydroxide solution were successively added to a 500 mL three-neck round flask, and then the reaction mixture was mechanically stirred at 40 °C for 3 h. Afterward, the ion-exchange magnetic microspheres (Fe 3 O 4 @SiO 2 @N(CH 3 ) 3 + ) were collected by magnetic force, and the product was alternately washed 5 times with water and ethanol to remove the excess reagents, before being dried in a drying oven [ 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Application of Ion-Exchange Magnetic Microspheres for Deep Removal of Trace Acetic Acid from DMAC Waste Liquid

Jin

Zhang

et al. 2023

Nanomaterials

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In order to develop a deep method for removing trace acetic acid from industrial solvents, a type of quaternary ammonium-salt-modified magnetic microspheres was developed as a potential nanoadsorbent for low-concentration acetic-acid-enhanced removal from DMAC aqueous solution. The ion-exchange magnetic microspheres (Fe3O4@SiO2@N(CH3)3+) have been prepared by a two-step sol-gel method with N-trimethoxysilylpropyl-N, N, N-trimethylammonium chloride as functional monomer, tetraethyl orthosilicate as a cross-linking agent, Fe3O4@SiO2 as a matrix. The nanocomposite is characterized by SEM, FI-IR, XRD, VSM, and XPS. Moreover, the optimization of adsorption experiments shows that the maximum adsorption capacity of nanoadsorbent is 7.25 mg/g at a concentration = 30 mg/L, adsorbent dosage = 10 mg, V = 10 mL, and room temperature. Furthermore, the saturated Fe3O4@SiO2@N(CH3)3+ achieved an efficient regeneration using a simple desorption method and demonstrated a good regeneration performance after five adsorption/desorption cycles. In addition, Fe3O4@SiO2@N(CH3)3+ was used to remove acetic acid in DMAC waste liquid; the adsorption effect is consistent with that of a nanoadsorbent of acetic acid in an aqueous solution. These results indicate that Fe3O4@SiO2@N(CH3)3+ can efficiently treat acetic acid that is difficult to remove from DMAC waste liquid.

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“…For example, Eqs. (4) [41][42][43][44][45][46][47] and (5) [7,35,[48][49][50][51][52][53] have been used to correlate water contaminant isotherm data. These two equations are, of course, equivalent to each other.…”

Section: ( ) ( ) ( )mentioning

confidence: 99%

The Halsey isotherm for water contaminant adsorption is fake

Chu

Bashiri

Hashim

et al. 2023

Separation and Purification Technology

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Arsenic(V) removal on the lanthanum-modified ion exchanger with quaternary ammonium groups based on iron oxide

Cited by 27 publications

References 54 publications

Electroreductive Defluorination of Unsaturated PFAS by a Quaternary Ammonium Surfactant-Modified Cathode via Direct Cathodic Reduction

Electroreductive Defluorination of Unsaturated PFAS by a Quaternary Ammonium Surfactant-Modified Cathode via Direct Cathodic Reduction

Synthesis and Application of Ion-Exchange Magnetic Microspheres for Deep Removal of Trace Acetic Acid from DMAC Waste Liquid

The Halsey isotherm for water contaminant adsorption is fake

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