Magnetite Fe3O4 nanoparticles and hematite α-Fe2O3 uniform oblique hexagonal microdisks, drum-like particles and spindles and their magnetic properties

Xu, Gang; Shen, Zhenju; Tao, Zhihong; Zhang, Yi; Tian, He; Wei, Xiao; Shen, Ge; Han, Gaorong

doi:10.1016/j.jallcom.2014.11.140

Cited by 29 publications

(13 citation statements)

References 44 publications

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“…Composites prepared with Fe 3 O 4 had the highest adsorption of CBZ for both the biochar and the activated carbon, and Fe 3 O 4 was selected to prepare the magnetic adsorbents in the following study. Another benefit to use Fe 3 O 4 composites is that Fe 3 O 4 has relatively high magnetism (Fe ∼ 215 emu/g, Fe 3 O 4 ∼ 80 emu/g and α-Fe 2 O 3 < 0.2 emu/g) [28,29], so magnetic biochar/Fe 3 O 4 and AC/Fe 3 O 4 can be easily separated from solution.…”

Section: Resultsmentioning

confidence: 99%

Preparation of ultrafine magnetic biochar and activated carbon for pharmaceutical adsorption and subsequent degradation by ball milling

Shan

Deng

Zhao

et al. 2016

Journal of Hazardous Materials

343

118

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Ball milling was used to prepare two ultrafine magnetic biochar/Fe3O4 and activated carbon (AC)/Fe3O4 hybrid materials targeted for use in pharmaceutical removal by adsorption and mechanochemical degradation of pharmaceutical compounds. Both hybrid adsorbents prepared after 2 hours milling exhibited high removal of carbamazepine (CBZ), and were easily separated magnetically. These adsorbents exhibited fast adsorption of CBZ and tetracycline (TC) in the initial 1 hour. The biochar/Fe3O4 had a maximum adsorption capacity of 62.7 mg/g for CBZ and 94.2 mg/g for TC, while values obtained for AC/Fe3O4 were 135.1 mg/g for CBZ and 45.3 mg/g for TC respectively when data were fitted using the Langmuir expression. Solution pH values slightly affected the sorption of TC on the adsorbents, while CBZ sorption was almost pH-independent. The spent adsorbents with adsorbed CBZ and TC were milled to degrade the adsorbed pollutants. The adsorbed TC itself was over 97% degraded after 3 hours of milling, while about half of adsorbed CBZ were remained. The addition of quartz sand was found to improve the mechanochemical degradation of CBZ on biochar/Fe3O4, and its degradation percent was up to 98.4% at the dose of 0.3 g quarts sand/g adsorbent. This research provided an easy method to prepare ultrafine magnetic adsorbents for the effective removal of typical pharmaceuticals from water or wastewater and degrade them using ball milling.

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Section: Resultsmentioning

confidence: 99%

Preparation of ultrafine magnetic biochar and activated carbon for pharmaceutical adsorption and subsequent degradation by ball milling

Shan

Deng

Zhao

et al. 2016

Journal of Hazardous Materials

343

118

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“…However, peaks labeled with red circles at 24.15˚, 33.25˚, 41.03˚, and 49.50˚, corresponding to (012), (104), (113), and (024) plane of hematite (JCPDS No. 79‐1741), were also observed, demonstrating the existence of α‐Fe 2 O 3 (Xu et al ). The Fe 2 O 3 phase might arise from the partial oxidation of the Fe 3 O 4 phase during the drying and calcination process.…”

Section: Resultsmentioning

confidence: 82%

2D‐Fe₃O₄ Nanosheets for Effective Arsenic Removal

Luo

Cheng

et al. 2017

Contemporary Water Research

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Fe3O4 adsorbent with 2D structures was synthesized via solvothermal method and its application in arsenic removal was investigated. Isotherms were generated at pH=4.7 and 7.6 and the results were best fitted by the Freundlich isotherm model; good As(V) adsorption capacity was achieved for the Fe3O4 adsorbent at both pH values. Furthermore, pH effects were evaluated; the optimal pH value for adsorption was 8.27 with the adsorption capacity and the removal efficiency being 18.55 mg/g and 93.69%, respectively. Based on the measurements of the zeta potential and particle size of the adsorbent, we proposed that the overall pH dependence was a result of the combined effects of the zeta potential, particle size of the adsorbent, and existing form of As(V). From kinetics studies, the As(V) adsorption by Fe3O4 adsorbent followed the pseudo‐second‐order model and could be described by a two stage mechanism. When initial As(V) concentration was 1 ppm, 73% of the As(V) was adsorbed within the first 2.5 minutes and an overall removal efficiency of 82.5% was achieved in 2 hours. Increased removal efficiency is expected at higher adsorbent loading, thus allowing the post‐treatment water to meet drinking water quality standards.

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“…Our previous researching works have demonstrated that the mixture solvent of EG and water in volume ratio of 30:10 creates a equilibrium condition for the crystallization of hematite α‐Fe 2 O 3 . Thus, in the current experiments the formed hematite α‐Fe 2 O 3 crystals grow to nanodisks closed with the basal facets of (0001) and side facets of {11‐20}, well reflecting the intrinsic symmetry of the lattice . On the other hand, the hydrothermal reaction is performed in an isolated system, in which the precursors involved for the synthesis of the hematite α‐Fe 2 O 3 are finite.…”

Section: Resultsmentioning

confidence: 99%

“…It has been previously demonstrated that the obtained α‐Fe 2 O 3 nanodisks are closed by {11‐20} side planes and (0001) basal planes . As for the larger α‐Fe 2 O 3 nanodisks with 600 nm in diameter and 230 nm in thickness, respectively, the area fractions of (0001) basal planes and {11‐20} side planes are 34.3% and 65.7%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Although there are a lot of investigations focused on iron oxide catalysts for CO 2 hydrogenation, few reports are related to the effects of the exposed planes of the iron oxide particles on the catalytic performances. In our previous researching work, hematite α‐Fe 2 O 3 nanodisks closed with (0001) basal planes and {11‐20} side planes have been realized via a simple facile hydrothermal route by employing the mixture solvent of ethylene glycol (EG) and distilled water as reaction medium . Herein, we further realized the size‐controlled synthesis of the hematite α‐Fe 2 O 3 nanodisks in diameter from 800 to 100 nm and thickness from 200 to 50 nm by simply tuning the mass of the reaction precursors.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Size‐controlled Synthesis of Hematite α‐Fe₂O₃Nanodisks Closed with (0001) Basal Facets and {11‐20} Side Facets and their Catalytic Performance for CO₂Hydrogenation

et al. 2020

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An improved hematite α‐Fe2O3 catalysts composed of uniform nanodisks closed with (0001) basal facets and {11‐20} side facets are prepared via a simple hydrothermal route. Moreover, by simply tuning the mass of the reaction precursors of Fe(NO3)3⋅9H2O, the size of the obtained hematite α‐Fe2O3 nanodisks is controlled in the range of 600–100 nm in diameter and 43–230 nm in thickness, respectively. Due to the exposed (0001) basal facets and {11‐20} facets, in which more amount of Fe3+ ion involved, the obtained α‐Fe2O3 nanodisks exhibit enhanced reducibility. The maximum H2 consumption occurs at relative lower temperature, ca. 490 °C for the smallest α‐Fe2O3 nanodisks of 43 nm in thickness and 100 nm in diameter, respectively. Relatively, the Fe3+ ions situated at (0001) planes facilitate the Fischer‐Tropsch synthesis (FTS) compared to that situated at {11‐20} planes. Due to the well dispersion and high fraction of (0001) basal facets, the α‐Fe2O3 nanodisks with middle size of 190 nm in thickness and 400 nm in diameter propose the high CO2 conversion and high hydrocarbon selectivity. Since more amount of (0001) basal facets are masked by the orientation aggregation along [0001] induced by the self‐magnetization, the least α‐Fe2O3 nanodisks provide a declined catalytic performance for CO2 hydrogenation.

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Magnetite Fe3O4 nanoparticles and hematite α-Fe2O3 uniform oblique hexagonal microdisks, drum-like particles and spindles and their magnetic properties

Cited by 29 publications

References 44 publications

Preparation of ultrafine magnetic biochar and activated carbon for pharmaceutical adsorption and subsequent degradation by ball milling

Preparation of ultrafine magnetic biochar and activated carbon for pharmaceutical adsorption and subsequent degradation by ball milling

2D‐Fe₃O₄ Nanosheets for Effective Arsenic Removal

Size‐controlled Synthesis of Hematite α‐Fe₂O₃Nanodisks Closed with (0001) Basal Facets and {11‐20} Side Facets and their Catalytic Performance for CO₂Hydrogenation

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Magnetite Fe3O4 nanoparticles and hematite α-Fe2O3 uniform oblique hexagonal microdisks, drum-like particles and spindles and their magnetic properties

Cited by 29 publications

References 44 publications

Preparation of ultrafine magnetic biochar and activated carbon for pharmaceutical adsorption and subsequent degradation by ball milling

Preparation of ultrafine magnetic biochar and activated carbon for pharmaceutical adsorption and subsequent degradation by ball milling

2D‐Fe3O4 Nanosheets for Effective Arsenic Removal

Size‐controlled Synthesis of Hematite α‐Fe2O3Nanodisks Closed with (0001) Basal Facets and {11‐20} Side Facets and their Catalytic Performance for CO2Hydrogenation

Contact Info

Product

Resources

About

2D‐Fe₃O₄ Nanosheets for Effective Arsenic Removal

Size‐controlled Synthesis of Hematite α‐Fe₂O₃Nanodisks Closed with (0001) Basal Facets and {11‐20} Side Facets and their Catalytic Performance for CO₂Hydrogenation