Electrochemical adsorption of perfluorooctanoic acid on a novel reduced graphene oxide aerogel loaded with Cu nanoparticles and fluorine

Liu, Longfei; Li, Yanli; Che, Naiju; Gao, Bin; Li, Chengliang

doi:10.1016/j.jhazmat.2021.125866

Cited by 22 publications

(5 citation statements)

References 63 publications

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“…This can be attributed to an increase in the overlapping effect for PFAS molecules in an adsorbent, resulting in a higher mass transfer rate. Please also note that the measured α values are comparable to those reported in the literature , where carbon-based adsorbents were employed.…”

Section: Resultssupporting

confidence: 83%

“…This can be attributed to an increase in the overlapping effect 48 for PFAS molecules in an adsorbent, resulting in a higher mass transfer rate. Please also note that the measured α values are comparable to those reported in the literature 36,52 where carbon-based adsorbents were employed. We also conducted electrosorption experiments under different voltages of +0.3 +0.7, and +1.0 V utilizing PFHxA, 4a,b, respectively.…”

Section: Electrosorption For Pfassupporting

confidence: 84%

“…Electric-field-aided sorption (i.e., electrosorption) allows the reversible adsorption and desorption of PFAS by switching the applied voltage. − Anodic application of voltage attracts and adsorbs deprotonated PFAS (i.e., anionic PFAS) to the electrode surface, with release occurring upon voltage reversal. Effective electrosorption necessitates adsorbents with properties including large specific surface area, capacitance, and chemical and thermal durability.…”

Section: Introductionmentioning

confidence: 99%

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Electrosorption-Driven Remediation of PFAS-Contaminated Water Using a MXene Nanosheet-PEDOT:PSS Adsorbent

Shrestha,

Ezazi,

Seo

et al. 2024

ACS Appl. Eng. Mater.

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Perfluoroalkyl substances (PFAS), widely used for their chemical and thermal stability in various industrial applications, have raised environmental and health concerns due to their ubiquitous presence in water sources. Stringent regulations targeting long-chain PFAS have been enacted, but emerging evidence indicates health risks associated with short-chain PFAS. Adsorption stands out as a viable remediation technology for PFAS-containing water. Electric-field-aided adsorption (electrosorption) emerges as a technique that has demonstrated that it can adsorb PFAS from water and enable on-demand desorption of the retained PFAS upon alternating the applied voltage. Effective electrosorption demands adsorbents with significant specific surface area, capacitance, and durability. Two-dimensional transition metal carbides and nanotrides (MXene) are competitive candidates. MXene, in conjunction with poly(3,4-ethylene dioxythiophene) polystyrenesulfonate (PEDOT:PSS), can exhibit increased surface area and capacitance. This study develops a titanium carbide (Ti 3 C 2 T x ) MXene-PEDOT:PSS adsorbent for PFAS electrosorption. Acid etching enhances the adsorbent's specific surface area and pore characteristics, resulting in an approximately 400% increase in volumetric capacitance for various PFAS compared to untreated counterparts. The adsorption capacity for perfluorohexanoic acid (PFHxA), perfluorooctanoic acid (PFOA), and perfluorononanoic acid (PFNA) is measured at 45.6, 51.1, and 54.9 mg/g, respectively, at an initial concentration of 750 ppb upon application of +1.0 V. The reversible adsorption−desorption cycles demonstrate the potential for repeated use of the adsorbent. We envision that the adsorbent can contribute to the development of efficient and sustainable technologies for addressing PFAS contamination in water sources.

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Section: Resultssupporting

confidence: 83%

Section: Electrosorption For Pfassupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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Electrosorption-Driven Remediation of PFAS-Contaminated Water Using a MXene Nanosheet-PEDOT:PSS Adsorbent

Shrestha,

Ezazi,

Seo

et al. 2024

ACS Appl. Eng. Mater.

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“…Otowa et al [45] claimed that KOH activation occurred via Equation ( 9). Guo et al [46], on the other hand, suggested that activation using KOH occurred by either Equation (9) or Equations ( 9) and (10), depending on the preparation method of the AC material. The larger surface area achieved for SBAC-KOH in this study could be due to the superiority of KOH as an activator over other metal hydroxides [46].…”

Section: Sbac Characteristicsmentioning

confidence: 99%

“…One of the concerns regarding these methods is their associated costs. For example, the cost of converting sewage sludge into biosolids ranges from USD 300 to 800 per dry ton, contributing to an average of 40% of the operational cost of wastewater treatment plants [9,10]. Another concern is the high contribution of these disposal methods to greenhouse gas emissions, which are estimated in tons CO 2 -eq/year, to be 2176-6026 for landfilling, 2102-5923 for composting, and 1825-5823 for land application [11].…”

Section: Introductionmentioning

confidence: 99%

Replacing Potassium Hydroxide with Carbide Lime Waste in Preparing Sludge-Based Activated Carbon for Methylene Blue Removal from Aqueous Solutions

Al Madhoon,

Maraqa,

El Dieb

et al. 2024

Sustainability

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Domestic wastewater treatment plants produce large amounts of waste sludge. Sludge can be used to produce activated carbon using potassium hydroxide (KOH) as an activating agent. However, KOH is expensive (relative to the cost of waste carbide lime), making the conversion of waste into valuable products unsustainable. This study explored the utilization of a solid waste by-product, carbide lime waste, as a replacement for KOH to produce sludge-based activated carbon (SBAC). The effects of activation conditions on the characteristics of SBAC were investigated and its performance for methylene blue (MB) removal from a solution was assessed. Post-production analyses using scanning electron microscopy and Fourier-transform infrared spectroscopy indicated that the SBAC produced had a porous surface rich in hydroxyl, aromatic, and alkyl functional groups. Among the tested cases of SBAC prepared using carbide lime, the highest removal of MB (240 mg/g) was achieved for the SBAC prepared at 700 °C with a 1:1 impregnation ratio when activated for 60 min and post-treated with 5M hydrochloric acid. The equilibrium adsorption of MB on SBAC was nonlinear. A strong correlation was found between the pore volume and adsorption capacity of the SBAC produced. The findings of this study suggest that the use of carbide lime waste for SBAC production is a viable alternative to an analytical-grade KOH activator.

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Understanding PFOS Adsorption on a Pt Electrode for Electrochemical Sensing Applications

Gogoi

Yao

2022

ChemElectroChem

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Per-and polyfluroalkyl substances (PFAS) are drawing increasing attention in the research community due to their wide spread applications and their toxicity to animals and humans. Effective early detection method of PFAS chemicals in aqueous environment is important to reduce exposure and mitigate the potential toxic effects. This study focuses on the electrochemical detection of per-fluoro octane sulfonate (PFOS) with differential pulse voltammetry and electrochemical impedance spectroscopy on a bare platinum electrode. We observe three distinct regions of adsorption behaviors with respect to PFOS concentration from 0-1000 nM, reflecting changes in the modes of adsorption due to different adsorbate-adsorbate interactions on a bare electrode. The adsorption isotherm constant for PFOS adsorption on a Pt electrode is calculated to be 1.6 × 10 12 cm 3 mol À 1 from fitting the electrochemical data with a modified Langmuir isotherm model.

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Electrochemical adsorption of perfluorooctanoic acid on a novel reduced graphene oxide aerogel loaded with Cu nanoparticles and fluorine

Cited by 22 publications

References 63 publications

Electrosorption-Driven Remediation of PFAS-Contaminated Water Using a MXene Nanosheet-PEDOT:PSS Adsorbent

Electrosorption-Driven Remediation of PFAS-Contaminated Water Using a MXene Nanosheet-PEDOT:PSS Adsorbent

Replacing Potassium Hydroxide with Carbide Lime Waste in Preparing Sludge-Based Activated Carbon for Methylene Blue Removal from Aqueous Solutions

Understanding PFOS Adsorption on a Pt Electrode for Electrochemical Sensing Applications

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