Compositional evolution of nanoscale zero valent iron and 2,4-dichlorophenol during dechlorination by attapulgite supported Fe/Ni nanoparticles

Anang, Emmanuella; Liu, Hong; Fan, Xiaoliang; Gong, Xuan

doi:10.1016/j.jhazmat.2021.125246

Cited by 33 publications

(7 citation statements)

References 44 publications

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“…However, it illustrates that after 1 h of reacting the n-Fe/Ni with p-CNB, part of the Fe0 is converted to ferrihydrite. The mechanism of Fe 0 transforming to ferrihydrite has been clearly explained in the literature [ 14 ]. At the 8 h reaction time, Fe 0 and ferrihydrite are converted to lepidocrocite (γ-FeOOH—JCPDS No 44-1415) with characteristic peaks at 14.1°, 27.1°, 36.3°, 46.8° and 60.7°; to goethite (α-FeOOH—JCPDS No 29-0713) with characteristic peaks of 21.2°, 36.7°, 53.2° and 58.9°; and to magnetite (Fe 3 O 4 —JCPDS No 01-1111) with characteristic peaks at 30.1°, 35.5° and 57.2°.…”

Section: Resultsmentioning

confidence: 99%

“…At the 8 h reaction time, Fe 0 and ferrihydrite are converted to lepidocrocite (γ-FeOOH—JCPDS No 44-1415) with characteristic peaks at 14.1°, 27.1°, 36.3°, 46.8° and 60.7°; to goethite (α-FeOOH—JCPDS No 29-0713) with characteristic peaks of 21.2°, 36.7°, 53.2° and 58.9°; and to magnetite (Fe 3 O 4 —JCPDS No 01-1111) with characteristic peaks at 30.1°, 35.5° and 57.2°. Considering that the Fe 0 transforms into lepidocrocite, goethite and magnetite, it represents that the Fe 0 converts into Fe 2+ and then changes further to Fe 3+ products with the help of H 2 O and the dissolved oxygen [ 14 ]. The XRD results are consistent with the HR-TEM results in terms of the reaction under 8 h. Although the characteristic peak of magnetite appears in the XRD pattern of n-Fe/Ni reaction for 8 h as well, its peak intensity is very weak, thus indicating that the content is small.…”

Section: Resultsmentioning

confidence: 99%

“…The chemical methods, including photocatalytic oxidation [ 9 ], Fenton oxidation [ 10 , 11 ] and nanotechnology [ 2 , 12 ], have been widely used to reduce p-CNB. Among these chemical methods, nanotechnology (nanoscale zerovalent iron (Fe 0 )) has been identified as the most effective due to its relatively low cost, high adsorption capacity, strong reactivity and high reductivity [ 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Coupling Removal of P-Chloronitrobenzene and Its Reduction Products by Nano Iron Doped with Ni and FeOOH (nFe/Ni-FeOOH)

Liang

Anang

et al. 2022

Materials

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The removal of chlorinated pollutants from water by nanoparticles is a hot topic in the field of environmental engineering. In this work, a novel technique that includes the coupling effect of n-Fe/Ni and its transformation products (FeOOH) on the removal of p-chloronitrobenzene (p-CNB) and its reduction products, p-chloroaniline (p-CAN) and aniline (AN), were investigated. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were employed to characterize the nano-iron before and after the reaction. The results show that Fe0 is mainly oxidized into lath-like lepidocrocite (γ-FeOOH) and needle-like goethite (α-FeOOH) after 8 h of reaction. The coupling removal process and the mechanism are as follows: Fe0 provides electrons to reduce p-CNB to p-CAN and then dechlorinates p-CAN to AN under the catalysis of Ni. Meanwhile, Fe0 is oxidized to FeOOH by the dissolved oxygen and H2O. AN is then adsorbed by FeOOH. Finally, p-CNB, p-CAN, and AN were completely removed from the water. In the pH range between 3 and 7, p-CAN can be completely dechlorinated by n-Fe/Ni within 20 min, while AN can be nearly 100% adsorbed by FeOOH within 36 h. When the temperature ranges from 15 °C to 35 °C, the dechlorination rate of p-CAN and the removal rate of AN are less affected by temperature. This study provides guidance on the thorough remediation of water bodies polluted by chlorinated organics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupling Removal of P-Chloronitrobenzene and Its Reduction Products by Nano Iron Doped with Ni and FeOOH (nFe/Ni-FeOOH)

Liang

Anang

et al. 2022

Materials

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“…The reductive dehalogenation of some bimetallic materials can be an effective method for detoxifying halogenated organic compounds and has started to be widely investigated by some researchers [10][11][12][13][14][15]. In these bimetallic materials, the first metal, which has a low standard redox potential (such as Fe, Mg, etc.…”

Section: Introductionmentioning

confidence: 99%

“…), is an electron donor that reduces the halogenated organic compounds [11,13]; the second metal, which has a high standard redox potential (such as Ni, Cu, Pd, etc. ), promotes the reactivity via hydrogenation and acceleration corrosion [10][11][12]16], acting as both catalyst and accelerator. Among them, Pd/Fe is the most investigated bimetal due to the low cost of Fe and excellent hydrogenation activity of Pd [14].…”

Section: Introductionmentioning

confidence: 99%

Removal of AOX in Activated Sludge of Industrial Chemical Dyestuff with Bimetallic Pd/Fe Particles

Zheng

et al. 2021

Water

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Pd/Fe bimetallic particles were synthesized by chemical deposition and used to remove absorbable organic halogens (AOX) in the activated sludge of a chemical dyestuff wastewater treatment plant. Bath experiments demonstrated that the Pd/Fe bimetallic particles could effectively remove AOX. It indicated several factors, such as Pd loading, the amount of Pd/Fe used, initial activated sludge pH, and reaction time, which could affect the removal effect. The results showed that increasing the Pd content in Pd/Fe particles, from 0.01 to 0.05 wt %, significantly increased the removal efficiency of AOX in activated sludge. The Pd/Fe particles had a much higher removal efficiency of AOX in the activated sludge than bare Fe particles. A slightly acidic condition with a Pd content of 0.05% and 10 g/L of Pd/Fe was beneficial to the process of removing AOX in activated sludge. In detail, the removal efficiency of AOX in the activated sludge could reach 50.7% after 15 days of reaction with 10 g/L of Pd/Fe (Pd loading 0.05 wt %) and at an initial pH of 6.0 during the experiments. It also showed that the control samples without Fe0 and Fe/Pd additions only removed 7.9% of AOX under the same conditions. Meanwhile, the concentrations of AOX in the supernatant of activated sludge were lower than the initial AOX concentration in the supernatant during the activated sludge remediation with Pd/Fe bimetallic particles. The results indicated that the AOX removal from the activated sludge matrix might be mainly due to the Pd/Fe bimetallic particles, and not just by phase transfer.

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Efficient Palladium Catalysts: Application and Challenges of Electrocatalytic Hydrodechlorination Technology in Wastewater Treatment

Li,

Kong

2023

ChemCatChem

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This review summarizes the research progress of palladium (Pd) catalysts in electrocatalytic hydrodechlorination (ECH) for the removal of chlorinated organic pollutants (COPs). ECH technology is a new type of green water treatment technology without secondary pollution, which has excellent removal effect on COPs. Pd is widely used in the field of ECH due to its excellent catalytic properties. However, the easy deactivation and high price of Pd have limited the application of Pd catalysts in practical wastewater treatment. Researchers have improved the performance of Pd catalysts for ECH by improving the morphological structure (dispersion, particle size, crystalline surface) and electronic states (electron‐rich Pd, electron‐deficient Pd). It is also found that modulation of the adsorption abilities of Pd catalysts can greatly improve the catalytic activity. The factors affecting the stability of Pd catalysts are also investigated, and the future large‐scale mature application of ECH technology is envisioned. The ability to prepare single‐atom Pd catalysts in a relatively simple way is a future direction, which will achieve 100% atom utilization and thus significantly reduce the cost of Pd. This review details the frontier research on Pd catalysts in the field of ECH, which can provide some good strategies for related researchers.

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Compositional evolution of nanoscale zero valent iron and 2,4-dichlorophenol during dechlorination by attapulgite supported Fe/Ni nanoparticles

Cited by 33 publications

References 44 publications

Coupling Removal of P-Chloronitrobenzene and Its Reduction Products by Nano Iron Doped with Ni and FeOOH (nFe/Ni-FeOOH)

Coupling Removal of P-Chloronitrobenzene and Its Reduction Products by Nano Iron Doped with Ni and FeOOH (nFe/Ni-FeOOH)

Removal of AOX in Activated Sludge of Industrial Chemical Dyestuff with Bimetallic Pd/Fe Particles

Efficient Palladium Catalysts: Application and Challenges of Electrocatalytic Hydrodechlorination Technology in Wastewater Treatment

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