Preparation and characterization of jarosite nanorods synthesized by microwave hydrothermal method

Labib, Sh.; Abdelaal, Saad; Abdelhady, A.M.; Elmaghraby, Elsayed K.

doi:10.1016/j.matchemphys.2020.123654

Cited by 15 publications

(4 citation statements)

References 42 publications

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“…Refs. 2 , 56 ) in the form: where the U, V, and W are the fitting parameters, see Fig. 8 c. Using the parameter fitting of data to Eq.…”

Section: Resultsmentioning

confidence: 99%

Radiation-induced lattice relaxation in $$\alpha $$-Fe$$_2$$O$$_3$$ nanorods

Khalil,

Abdelaal,

Abdelhady

et al. 2023

Sci Rep

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We report radiation-induced lattice relaxation of the $$\alpha $$ α -Fe$$_2$$ 2 O$$_3$$ 3 and its associated alteration of particle morphology. The $$\alpha $$ α -Fe$$_2$$ 2 O$$_3$$ 3 was grown in solution by microwave hydrothermal synthesis technique in which more than half of the synthesized material was nanorods with axis along the (001) direction. Five sets of the synthesized $$\alpha $$ α -Fe$$_2$$ 2 O$$_3$$ 3 samples were irradiated using gamma-ray from $$^{60}$$ 60 Co cell with doses of 600 kGy, 700 kGy, 800 kGy, 900 kGy, and 1 MGy. The investigation of the pristine and gamma-irradiated samples was carried out using X-ray powder diffraction, transmission electron microscope, and electron paramagnetic resonance methods. Results showed that continuous alternation of radiation-induced lattice compression and expansion causes lattice relaxation. The morphology of the $$\alpha $$ α -Fe$$_2$$ 2 O$$_3$$ 3 nanorods was found to change with absorbed dose into buckyball-shaped particles in response to the alternation of the compression and expansion strain. The EPR results showed a correlation between distortion in the $$O_h$$ O h –$$FeO_6$$ F e O 6 octahedron structure and the relaxation of the lattice. The synthesis, growth, and relaxation are discussed in detail.

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“…Refs. 2 , 56 ) in the form: where the U, V, and W are the fitting parameters, see Fig. 8 c. Using the parameter fitting of data to Eq.…”

Section: Resultsmentioning

confidence: 99%

Radiation-induced lattice relaxation in $$\alpha $$-Fe$$_2$$O$$_3$$ nanorods

Khalil,

Abdelaal,

Abdelhady

et al. 2023

Sci Rep

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“…Even though some jarosite minerals only require Fe 2 (SO 4 ) 3 and water, some also require the use of high temperatures and necessitate longer synthesis times 19 . Chemical methods employ a number of toxic chemicals 24 , whilst the biological oxidation of Fe during hydronium jarosite formation is significantly affected by acidity and temperature 25 , 26 . Only very recently, the synthesis and characterization of rod-shaped jarosite nanoparticles using a microwave-assisted hydrothermal method have also been reported 25 .…”

Section: Introductionmentioning

confidence: 99%

“…Chemical methods employ a number of toxic chemicals 24 , whilst the biological oxidation of Fe during hydronium jarosite formation is significantly affected by acidity and temperature 25 , 26 . Only very recently, the synthesis and characterization of rod-shaped jarosite nanoparticles using a microwave-assisted hydrothermal method have also been reported 25 . As nanomaterials have been shown to have increased reactivity for application across multidisciplinary research fields due to their unique physico-chemical properties and larger surface to volume ratio, the catalytic potential of hydronium jarosite may be further developed by tuning its physico-chemical properties to the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Physical properties of computationally informed phyto-engineered 2-D nanoscaled hydronium jarosite

Botha

Cloete

Welegergs

et al. 2023

Sci Rep

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This study describes a molecular dynamics computational modelling informed bioengineering of nano-scaled 2-D hydronium jarosite. More specifically, a phyto-engineering approach using green nano-chemistry and agro-waste in the form of avocado seed natural extract was utilized as a green, economic, and eco-friendly approach to synthesize this unique mineral at the nanoscale via the reduction of iron (II) sulphate heptahydrate. The nanoproduct which was found to exhibit a quasi-2D structure was characterized using a multi-technique approach to describe its morphological, optical, electrochemical, and magnetic properties. Radial distribution function and electrostatic potential maps revealed that flavone, a phenolic compound within the avocado seed natural extract, has a higher affinity of interaction with the nanoparticle's surface, whilst vanillic acid has a higher wetting tendency and thus a lower affinity for interacting with the hydronium jarosite nanoparticle surface compared to other phytoactive compounds. XRD and HRTEM results indicated that the nanoscale product was representative of crystalline rhombohedral hydronium jarosite in the form of quasi-triangular nanosheets decorated on the edges with nanoparticles of approximately 5.4 nm diameter that exhibited significant electrochemical and electroconductive behaviours. Magnetic studies further showed a diamagnetic behaviour based on the relationship of the inverse susceptibility of the nanomaterial with temperature sweep.

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“…In Table 1 are summarized some of the typical methods reported to synthesize jarosites. The scientific community has scarcely explored the microwave-assisted synthesis of jarosites [24,25]. The crystallization parameters, such as the source of iron, reagent ratio, stirring speed, pH, temperature, and pressure, have significantly affected the morphology and the particle size of the jarosite [20].…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Adsorbents Based on Jarosites for Removal of Inorganic Micropollutants from Water

López-Martínez¹,

Khamkure²,

Gamero‐Melo³

2023

Separations

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This paper presents a novel family of jarosites with the molecular formula MFe3(SO4)2(OH)6·xH2O; M = Na, K, NH4 that have high efficiency in the adsorption of As(V) and Pb(II) dissolved in water. The jarosites have been prepared by conventional heating at temperatures close to 95 °C for 3 h. The synthesis method was improved and optimized to reduce the time and energy consumption. The improved conventional heating method allowed for the synthesis of Na− and K−jarosites with a yield of up to 97.8 wt.% at 105 and 150 °C, respectively, in 3 h. The Na−, K−, and NH4−jarosites were synthesized at 150 °C in 5 min via a microwave-assisted method, which yielded jarosite crystalline agglomerates with more uniform topography, shape, and size than the conventional method. Both methods allowed the selective synthesis of jarosites. Chemical decomposition of jarosites suspended in water occurred at a pH less than 2 and higher than 10 and temperatures up to 150 °C. In the solid state, the jarosites were thermally stable at least to 300 °C. The Na−jarosite presented a maximum adsorption capacity (Qmax) of 65.6 mg g−1 for As(V) and 94 mg g−1 for Pb(II). The jarosites are considered promising bifunctional adsorbents for the remediation of contaminated water due to their improved synthesis method, stability, and high adsorption capacity for ions of different natures.

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Preparation and characterization of jarosite nanorods synthesized by microwave hydrothermal method

Cited by 15 publications

References 42 publications

Radiation-induced lattice relaxation in $$\alpha $$-Fe$$_2$$O$$_3$$ nanorods

Radiation-induced lattice relaxation in $$\alpha $$-Fe$$_2$$O$$_3$$ nanorods

Physical properties of computationally informed phyto-engineered 2-D nanoscaled hydronium jarosite

Bifunctional Adsorbents Based on Jarosites for Removal of Inorganic Micropollutants from Water

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