Effects of Surface Iron Hydroxyl Group Site Densities on Arsenate Adsorption by Iron Oxide Nanocomposites

Chen, Xu; Dou, Xiaomin; Mohan, Dinesh; Pittman, Charles U.; Hu, Meng; Ok, Yong Sik

doi:10.1166/nnl.2016.2190

Cited by 12 publications

(4 citation statements)

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“…The effectiveness of the treatments in immobilizing As depends upon several factors, with surface area, pH, and functional groups playing an important role. Chemical adsorption plays a pivotal role, where oxygenated functional groups, including ‐O‐H groups, determine ion exchange capabilities and adsorption with As (Chen et al., 2016). In the case of HC, oxygenated groups, including carbonyl and carboxyl groups (∼1,620 cm −1 ; Supplemental Figure S1), take part in adsorption.…”

Section: Resultsmentioning

confidence: 99%

“…For Fe 3 O 4 @C‐10, Fe 3 O 4 @C‐25, and Fe 3 O 4 @C‐50 modified with Fe, the hydroxyl groups (∼3,000 cm −1 ; Supplemental Figure S1) and the number of titratable proton sites on the amendment surfaces favor As adsorption. This reaction occurs when As reacts with iron‐OH groups (Chen et al., 2016). Arsenic affinity for ‐OH and ‐O groups through forming inner‐sphere complexes with iron oxyhydroxide is well established (Müller et al., 2010), resulting in the formation of As–O–Fe groups (Repo et al., 2012).…”

Section: Resultsmentioning

confidence: 99%

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Arsenic immobilization in soil affected by mining waste using waste‐derived functional hydrochar and iron‐encapsulated materials

Haris

Netherway²,

Eshtiaghi

et al. 2023

J of Env Quality

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Arsenic (As) contamination is a widespread problem. Continued and concerted effort in exploring sustainable remediation strategies is required, with in situ immobilization emerging as a promising option. This work valorized a waste by‐product from olive (Olea europaea L.) milling into functional hydrochar (HC). The HC was then transformed into iron oxide–encapsulated carbon with three different iron loading rates (10, 25, and 50% w/w of iron chloride hexahydrate added to the olive mill waste feedstock). The HC and the three iron oxide–encapsulated carbon materials were then tested in a pot trial using a 3% w/w application rate as a means to immobilize As in a mining‐contaminated soil (2,580 ± 110 mg kg−1 As). After a 45‐d incubation period, the effect of adding the amendments on As mobility and bioaccessibility compared with an untreated control was measured using a sequential extraction procedure and in vitro bioaccessibility, respectively. All four treatments resulted in a decrease in mobility and in vitro bioaccessibility as compared with the control. Specifically, As in the mobile phases was up to 35% less than the in control, whereas bioaccessibility was 21.8% in the control and ranged from 17.5 to 12.3% in the treatments. The efficiency of amendments to immobilize As increased with the iron content of the developed materials. This work positions HCs and iron oxide–encapsulated carbon materials produced from olive mill waste as promising options to immobilize As in situ.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Arsenic immobilization in soil affected by mining waste using waste‐derived functional hydrochar and iron‐encapsulated materials

Haris

Netherway²,

Eshtiaghi

et al. 2023

J of Env Quality

View full text Add to dashboard Cite

show abstract

“…The second is due to the CFCC 6 h electrode architecture. The presence of porous nanoparticles increases the electrode surface area and helps intercalation of Sodium ions deep into the electrode material and adsorb on the surface of the electrode (Chen et al ., 2016). The difference was about ~5% at the initial conductivity of 1500 μS/cm.…”

Section: Resultsmentioning

confidence: 99%

CoFe₂O₄/Fe₂O₃ on carbon cloth as binder free electrodes for desalination using capacitive deionization method

Inbaraj

Mangalaraj

2020

Water & Environment J

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Desalination of saline water was carried out by capacitive deionization (capDI) method. Pseudocapacitive materials (CoFe2O4/Fe2O3) were coated on the carbon cloth as capDI electrode for three different reaction time (6, 9 and 12 h). Synthesized capDI electrodes were characterized using SEM, XRD, Raman and XPS. The desalination was tested by batch method to study the desalination performance of the synthesized electrode. The results showed that 89% and 30 % of desalination efficiency at 200 and 500 mg/L (1500 μS/cm initial conductivity), respectively for 6 h reaction time sample. The adsorption of inorganic ions from the saline water on 6 h sample was found to be about 30 mg/g at an initial concentration of 500 mg/L. The kinetic analysis indicated that the electrosorption of NaCl on capDI electrodes followed pseudo‐first order kinetics model. Overall, the developed pseudocapacitive capDI electrode was able to desalinate NaCl by capacitive deionization method under experimental condition.

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“…Compared with natural soil and Pb polluted soil, the XPS spectrum of 10% NZVI treated soil presented slightly shifting indicating that NZVI changed surface atom chemical bond structure of soil. XPS techniques only characterize the surface several nanometers of material and Nano-zero-valent iron was easily oxidized resulting in the absence of zero-valent iron peak [40].…”

Section: Xpsmentioning

confidence: 99%

Untitled

2018

Int J Earth Sci Geophys

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Nanoscale Zero Valent Iron (NZVI) is the most widely used engineering nanomaterials in the remediation of contaminated site. This study investigated the effect of NZVI treatment on the physicochemical properties of Lead (Pb)-contaminated soil to improve the understanding of the soil improvement. The changes of soil physicochemical properties were investigated using the concentration range of 0.2%, 1%, 5%, and 10% NZVI g/g dry soil. Results showed that the introduction of NZVI to the Pb-contaminated soil resulted in substantial changes in the surface physicochemical properties. The ferric and ferrous ions, and the lead ions were released at the same time from the corrosion of NZVI precipitation, and from the surface of soil particles, respectively, amongst which, part of exchangeable lead ions were reduced to Pb(I) and/or Pb 0. A general change in the soil's electrical conductivity, BET surface area, soil buffering capacity, and soil's particle size was confirmed. A conclusion was drawn that the mass transfer of NZVI and its induced precipitation of Fe/Pb ions made a great contribution to the changes of soil physicochemical properties. This study could make for the application of nanomaterials in remediation of contaminated sites, especially for the brownfield remediation and backfill usage after the contaminated soil was remediated.

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Effects of Surface Iron Hydroxyl Group Site Densities on Arsenate Adsorption by Iron Oxide Nanocomposites

Cited by 12 publications

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Arsenic immobilization in soil affected by mining waste using waste‐derived functional hydrochar and iron‐encapsulated materials

Arsenic immobilization in soil affected by mining waste using waste‐derived functional hydrochar and iron‐encapsulated materials

CoFe₂O₄/Fe₂O₃ on carbon cloth as binder free electrodes for desalination using capacitive deionization method

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Effects of Surface Iron Hydroxyl Group Site Densities on Arsenate Adsorption by Iron Oxide Nanocomposites

Cited by 12 publications

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Arsenic immobilization in soil affected by mining waste using waste‐derived functional hydrochar and iron‐encapsulated materials

Arsenic immobilization in soil affected by mining waste using waste‐derived functional hydrochar and iron‐encapsulated materials

CoFe2O4/Fe2O3 on carbon cloth as binder free electrodes for desalination using capacitive deionization method

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CoFe₂O₄/Fe₂O₃ on carbon cloth as binder free electrodes for desalination using capacitive deionization method