Synthesis of bismuth mixed oxide by thermal decomposition of a coprecipitate precursor

Bahmani, Abdellah; Sellami, Mayouf; Bettahar, Noureddine

doi:10.1007/s10973-011-1611-9

Cited by 15 publications

(7 citation statements)

References 55 publications

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“…Commercially, bismuth oxide can be obtained using one of the three methods [8]: dissolution of bismuth in nitric acid and subsequent calcinations of bismuth nitrate, reaction of bismuth nitrate with alkali-metal hydroxide, and direct oxidation of bismuth at 850-900°C. In laboratory scale, Bi 2 O 3 can be synthesized from bismuth nitrate and urea with thermal decomposition of the solid product [9], hydrothermal synthesis [10], and thermal decomposition of bismuth oxalate [11,12]. Among five polymorphic forms of bismuth oxide, α-Bi 2 O 3 , β-Bi 2 O 3 , γ-Bi 2 O 3 , δ-Bi 2 O 3 , and ω-Bi 2 O 3 , only α−and δ−are thermodynamically stable while β−and γ −are metastable ,and depending on the method of synthesis, the specific surface area of Bi 2 O 3 may vary from 0.2 to 39 m 2 /g [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

Ciszewski

Mianowski

Szatkowski

et al. 2014

Ionics

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We have reported a new reduced graphene oxidebismuth oxide composite that can be used as a supercapacitor electrode. Bi 2 O 3 was synthesized from bismuth nitrate pentahydrate and oxalic acid as a precipitating agent using a hydrothermal process in an aqueous graphene oxide suspension. Instead of mixing graphene oxide with bismuth oxide, we have developed a bismuth oxalate precipitation between the layers. As prepared, composite of hydrated bismuth oxalate and graphene oxide was converted to bismuth oxide and reduced graphene oxide by thermal decomposition in a muffle stove. The material exhibited the specific capacitance of 94 F/ g at current density 0.2 A/g. Using the cyclic voltammetry, the specific capacitance was as high as 55 F/g at scan rate 5 mV/s over the potential range 0-1 V. The material exhibited longterm cycle stability retaining 90 % specific capacitance after 3,000 cycles. Except Bi 3+ ions present in Bi 2 O 3 , some amount of higher energy Bi 5+ was confirmed.

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Section: Introductionmentioning

confidence: 99%

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

Ciszewski

Mianowski

Szatkowski

et al. 2014

Ionics

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“…However, some of these synthetic techniques require a prolong calcinations treatment, costly organic solvents, and equipments. The coprecipitation method is most commonly used method for the synthesis of mixed oxides [18]. This method has several advantages like, is one of the simple and rapid method of preparation, control of particle size and composition is possible, possibilities to modify the particle surface, and maintain overall homogeneity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanosized BaZrO3 from oxalate precursor

Lavand

Malghe

2014

J Therm Anal Calorim

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Nanosized barium zirconate (BaZrO 3 ) is prepared from its oxalate precursor, barium zirconyl oxalate (BZO). The decomposition of BZO precursor was studied by thermogravimetry, differential thermal analysis, fourier transform infra red spectroscopy (FTIR), and X-ray diffraction (XRD) techniques. FTIR and XRD study reveals that BZO precursor calcined at 1173 K for 2 h gives nanosized perovskite type cubic BaZrO 3 powder. The transmission electron microscope study shows that BaZrO 3 particles prepared at 1173 K is nearly spherical in shape with diameter of 40-75 nm. Particle size study was carried out to investigate particle size distribution of BaZrO 3 particles. Band gap of BaZrO 3 was estimated from UV-visible spectroscopy data. Impedance measurement study shows that dielectric constant of BaZrO 3 prepared in this work is 31.69 at 10 kHz.

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“…The conventional simple metal–oxalate complex is a significant asset for material fabrication. Recently, we have successfully prepared various nano/microsize materials using oxalic acid in a hydrothermal and thermal decompositions process. ,− Though various reports addressed various aspects of bismuth oxalate preparation and its decomposition, it has been rarely used as a precursor for various morphological bismuth oxide syntheses. − Recently, Chen et al prepared bismuth oxide nanoflakes by using bismuth oxalate as a precursor with and without using l -lysine . Porous photocatalysts have been found to be highly efficient for the decomposition of pollutants. , Thus, porous photocatalysts offer an adjustable environment for encapsulating the target pollutants on the internal surface of the pores which may increase the degradation rate substantially.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Tunable Bi₂O₃ Self-Assembly and Its Visible Light Photocatalytic Activity

et al. 2012

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In this article, we report the fabrication of various morphological bismuth oxides (α-Bi2O3) by a self-assembly process using bismuth oxalates as precursors. Barlike Bi2(C2O4)3·7H2O and microrod-like (BiOHC2O4)2·H2O were synthesized by using bismuth nitrate with oxalic acid in a simple mixing and hydrothermal process and are hereafter referred to as bismuth oxalate-1 and bismuth oxalate-2, respectively. The thermal decomposition of bismuth oxalate-2 at 300 and 400 °C for 2 h yields aggregate-free honeycomb brushlike and wormlike morphological Bi2O3, respectively. We first report the formation of both the above-mentioned novel morphological bismuth oxides. However, the decomposition of bismuth oxalate-1 results in microspheres with bundle-shaped particles and wormlike bundles with microflower morphologies at 300 and 400 °C, respectively. The influences of hydrothermal temperature, time, and bismuth precursor on the formation of bismuth oxalate-2 were investigated. The synthesized bismuth oxalates and Bi2O3 were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and nitrogen adsorption analysis. The XRD patterns indicated that well-crystallized α-Bi2O3 was formed in the thermal decomposition process from both precursors. The FE-SEM images indicated the formation of well-organized honeycomb brush-like and worm-like morphologies. The photocatalytic degradation of Acid Orange 7 (AO7) dye by using the synthesized bismuth oxides was investigated, and the results showed superior photocatalytic activity of the honeycomb brushlike Bi2O3. We propose a plausible mechanism for the formation of various morphologies of Bi2O3.

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Synthesis of bismuth mixed oxide by thermal decomposition of a coprecipitate precursor

Cited by 15 publications

References 55 publications

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

Synthesis of nanosized BaZrO3 from oxalate precursor

Facile Fabrication of Tunable Bi₂O₃ Self-Assembly and Its Visible Light Photocatalytic Activity

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Synthesis of bismuth mixed oxide by thermal decomposition of a coprecipitate precursor

Cited by 15 publications

References 55 publications

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

Reduced graphene oxide–bismuth oxide composite as electrode material for supercapacitors

Synthesis of nanosized BaZrO3 from oxalate precursor

Facile Fabrication of Tunable Bi2O3 Self-Assembly and Its Visible Light Photocatalytic Activity

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Facile Fabrication of Tunable Bi₂O₃ Self-Assembly and Its Visible Light Photocatalytic Activity