Cobalt oxide doped hematite as a petrol vapor sensor

Deshmane, Vikas V.; Patil, Arun V.

doi:10.1016/j.matchemphys.2020.122813

Cited by 7 publications

(1 citation statement)

References 27 publications

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“…Among iron-containing materials, iron oxides, such as FeO, α-, β-, γ-, and ε-Fe 2 O 3 , and Fe 3 O 4 , have simple crystal structures and excellent properties, resulting in many practical uses in various industrial products, such as colorants, catalysts, and magnetic materials [2,3]. In particular, hematite (α-Fe 2 O 3 ) fine powder has been traditionally used as a pigment; in recent years, hematite nanoparticles have been actively studied for advanced applications, e.g., as anode materials in lithium-ion batteries [4][5][6][7][8], adsorbents for removal of heavy metals and dyes [8][9][10][11][12], sensors [13][14][15][16][17], and photocatalysts [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effects of Coexisting Anions on the Formation of Hematite Nanoparticles in a Hydrothermal Process with Urea Hydrolysis and the Congo Red Dye Adsorption Properties

Onizuka

Fukuda

Iwasaki

2023

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Crystalline hematite nanoparticles as adsorbents for anionic Congo red dye were prepared by a hydrothermal process using urea hydrolysis. To examine the effects of coexisting anions in a solution on the formation of hematite nanoparticles, different iron(III) salts, including iron chloride hexahydrate, iron nitrate nonahydrate, iron sulfate n-hydrate, ammonium iron sulfate dodecahydrate, and basic ferric acetate, were employed as iron-ion sources. After the hydrothermal treatment of the solution, consisting of an iron salt and urea at 423 K for 20 h, a single phase of hematite was formed from the iron-nitrate solution. The results suggested that the hydrothermal formation of hematite depended on the stability of iron complexes formed in the starting solution. The average crystallite size and median diameter of hematite nanoparticles also depended on the coexisting anions, suggesting that the appropriate selection of the coexisting anions in the starting solution can allow for control of the crystallite size and particle diameter of hematite nanoparticles. The Congo red adsorption kinetics and isotherms of the hematite nanoparticles were described by the Elovich model and Langmuir model, respectively. The adsorption thermodynamics parameters were estimated, which suggested an exothermic and spontaneous process. The results demonstrated good adsorption properties for Congo red adsorption.

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