Rapid nanosheets and nanowires formation by thermal oxidation of iron in water vapour and their applications as Cr(VI) adsorbent

Budiman, Faisal; Bashirom, Nurulhuda; Tan, Wei; Razak, Khairunisak Abdul; Matsuda, Atsunori; Lockman, Zainovia

doi:10.1016/j.apsusc.2016.01.209

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…It is assumed that either the surface diffusion or the dissociation of the oxidant is the rate-limiting step for platelet formation. Hence, the rapid dissociation of water enhances the formation of oxide platelets [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Total Pressure and Furnace Tube Material on the Oxidation of T22 in Humidified Air

Schlereth

Galetz

2021

Oxid Met

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Oxidation of the Fe-base alloy T22 in humid air at 500 °C was investigated. The samples were exposed for up to 1000 h at 1 bar and 20 bar. The influence of three furnace tube materials, alumina, ET45 and quartz glass, on the oxide scale morphology was investigated. Samples and their cross sections were examined using optical microscopy, scanning electron microscopy, electron probe micro analysis and Raman spectroscopy. Multilayered oxide scales consisting of hematite, magnetite and Fe–Cr spinel were found on all samples. However, the composition and morphology of the oxide scales depend on the furnace tube material and on the system pressure. The system pressure is assumed to change the reaction equilibria and adsorption rates. The tube material changed the initial gas composition by formation of volatile Cr species. This volatilization rate increased at higher system pressures.

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Section: Introductionmentioning

confidence: 99%

Effect of Total Pressure and Furnace Tube Material on the Oxidation of T22 in Humidified Air

Schlereth

Galetz

2021

Oxid Met

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“…20−22 Iron oxide is an excellent adsorbent which has good performance for heavy-metals adsorption over a wide pH range. 23 It can facilitate recovery of the adsorbent after the adsorption process owing to its higher density compared with carbonaceous materials. 24 However, the lack of surface functional groups has restricted iron oxide for selective adsorption.…”

Section: ■ Introductionmentioning

confidence: 99%

Dual-Core Fe₂O₃@Carbon Structure Derived from Hydrothermal Carbonization of Chitosan as a Highly Efficient Material for Selective Adsorption

Wang

Zhan

Ding

et al. 2017

ACS Sustainable Chem. Eng.

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A dual-core Fe 2 O 3 @carbon structure was prepared by a hydrothermal treatment of iron salt and chitosan (CS) solution. The structure exhibits microsphere-like (∼850 nm in size) morphology with dual cores at two ends. The existence of CS plays an important role in the formation of the dual-core−shell structure. The unique structure was investigated to be a CS adsorption, and subsequent carbonization induced a selective etching process. Further, the special structure was proven to be a highly efficient material for selective adsorption. The dual-core structure facilitates the exposure of the Fe 2 O 3 surface, and the carbonaceous shell gives plenty of functional groups for selective adsorption. More importantly, the selectivity was highly dependent on pH values. It was found that the adsorbent showed higher adsorption selectivity toward Cr(VI) at lower pH values, while the selectivity transferred toward Cu(II) at higher pH values by adsorption of Cu(II) and Cr(VI) in single-component solutions. In binary-component solution, the dual-core Fe 2 O 3 @C structure revealed adsorption selectivity for Cr(VI), with the highest separator factor [α Cu(II) Cr(VI) ] = 1162, due to the strong electrostatic adsorption-coupled reduction interaction induced by the special structure of the adsorbent. This work not only gives deep insights into the understanding of the formation of the dual-core structure but also supplies a novel adsorbent with selective adsorption properties for water treatment.

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“…Apart from temperature, oxidation time and environment also affect the growth of NWs (Rahmat et al 2020). Our previous work explored the formation of iron oxide NWs by thermal oxidation in water-vapor-assisted conditions (Rahmat et al 2018b;Budiman et al 2016). The presence of water vapor during oxidation induced more densely packed nanostructures with a uniform distribution compared with those under dry-air conditions; however, this work was performed at lower temperatures (400°C-500°C).…”

Section: Introductionmentioning

confidence: 97%

“…Although there are various other ways of producing α-Fe2O3 NWs, such electrospinning (Deng et al 2018;Ponti et al 2020), hydrothermal (Sun et al 2020), and nanocasting methods (Azeez et al 2021), which produce NWs with a uniform diameter and length, they are known to be time consuming, and post-annealing treatments are required for crystalline oxide formation. Thermal oxidation presents a simpler approach to forming surface oxide layers, and, through careful control of the oxidation parameters, e.g., oxidation temperature (Rahmat et al 2018a;Rahmat et al 2018b;Srivastava et al 2016;Budiman et al 2016), unique nanostructures can be produced. Apart from temperature, oxidation time and environment also affect the growth of NWs (Rahmat et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Our previous work on the synthesis of iron oxide NWs using thermal oxidation focused on a low-temperature oxidation regime (Budiman et al 2016). In this study, we investigated the formation of iron oxide nanostructures by thermal oxidation under water-vapor-assisted conditions at high temperatures (i.e., 700°C and 800°C) to assess the Cr(VI) removal capability of the samples.…”

Section: Introductionmentioning

confidence: 99%

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Formation of Dense and High-Aspect-Ratio Iron Oxide Nanowires by Water-Vapor-Assisted Thermal Oxidation and their Cr(VI) Adsorption Properties

Budiman

Tan

Kawamura

et al. 2021

Preprint

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In this work, highly crystalline and high aspect ratio α-Fe2O3 nanowire (NWs) were successfully produced by thermal oxidation of iron in water vapor at 800°C. The process was done for 2 h and the NWs were found to be covering the foil uniformly unlike when the oxidation environment was dry whereby the NWs formed were shorted and rather dispersed. The formation of NWs was proposed to be due to a stress-driven surface diffusion during thermal oxidation process. When oxidation was done at 700 oC, we observed coral-like nanostructures. The α-Fe2O3 NWs were then used as adsorbent to remove Cr(VI) from stimulated wastewater. Removal efficiency of 97% in a 225 mg/L Cr(VI) solution was observed indicating very fast removal of Cr(VI) in the presence of the NWs. The kinetic characteristic of the adsorption was fitted to a pseudo-second-order kinetic model, and isothermal studies indicated that the α-Fe2O3 NWs exhibited an adsorption capacity of 66.26 mg/g.

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Rapid nanosheets and nanowires formation by thermal oxidation of iron in water vapour and their applications as Cr(VI) adsorbent

Cited by 19 publications

References 16 publications

Effect of Total Pressure and Furnace Tube Material on the Oxidation of T22 in Humidified Air

Effect of Total Pressure and Furnace Tube Material on the Oxidation of T22 in Humidified Air

Dual-Core Fe₂O₃@Carbon Structure Derived from Hydrothermal Carbonization of Chitosan as a Highly Efficient Material for Selective Adsorption

Formation of Dense and High-Aspect-Ratio Iron Oxide Nanowires by Water-Vapor-Assisted Thermal Oxidation and their Cr(VI) Adsorption Properties

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Rapid nanosheets and nanowires formation by thermal oxidation of iron in water vapour and their applications as Cr(VI) adsorbent

Cited by 19 publications

References 16 publications

Effect of Total Pressure and Furnace Tube Material on the Oxidation of T22 in Humidified Air

Effect of Total Pressure and Furnace Tube Material on the Oxidation of T22 in Humidified Air

Dual-Core Fe2O3@Carbon Structure Derived from Hydrothermal Carbonization of Chitosan as a Highly Efficient Material for Selective Adsorption

Formation of Dense and High-Aspect-Ratio Iron Oxide Nanowires by Water-Vapor-Assisted Thermal Oxidation and their Cr(VI) Adsorption Properties

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Dual-Core Fe₂O₃@Carbon Structure Derived from Hydrothermal Carbonization of Chitosan as a Highly Efficient Material for Selective Adsorption