The thermal decomposition of monohydrated ammonium oxotris (oxalate) niobate

Medeiros, F.F.P; Moura, Maria de Fátima Vitória de; Silva, A. G. P. da; Souza, Carlson Pereira de; Gomes, K. K. P.; Gomes, Uílame Umbelino

doi:10.1590/s0104-66322006000400011

Cited by 19 publications

(4 citation statements)

References 5 publications

(5 reference statements)

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“…Actually, the frequency of the CO vibrations was decreased by the resonance effect. The peaks observed at 904, 759 and 491 cm −1 can be attributed to the v (CO) and v (CO 2 ) [36–38]. Likewise, the peak that appeared at 673 cm −1 can be ascribed to the vibration band of the Cd-O bond formed in the precursor [39].…”

Section: Resultsmentioning

confidence: 99%

Preparation of CdO Rhombus-Like Nanostructure and Its Photocatalytic Degradation of Azo Dyes from Aqueous Solution

Tadjarodi

Imani

Kerdari

et al. 2014

Nanomaterials and Nanotechnology

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In this work, a special rhombus-like structure of CdO composed of particles at the nanometre scale was successfully synthesized for the first time. A facile hydrothermal process with a post-reaction calcination was employed to prepare this nanomaterial. Scanning electron microscopy (SEM) images showed that the obtained rhombus-like structure consists of nanoparticles with an average size of 29 nm. The band gap energy of 1.9 eV based on a diffuse reflectance spectroscopy (DRS) showed that the product can be favourable to photoactivity in the visible region of sunlight. The prepared sample was employed to destruct carcinogenic azo dyes, such as Congo Red (CR), Malachite Green (MG) and Crystal Violet (CV). The obtained results showed that the CdO with the special morphology was able to effectively catalyse the degradation of these pollutants. The related decolourization efficiencies were obtained by up to 100% after various lengths of time of light irradiation. It was concluded that the photodegradation of the mentioned organic dyes under visible light irradiation by a CdO rhombus-like nanostructure follows the first-order reaction kinetics. The effect of the initial pH and contact time on the percentage of the decolourization of these organic dyes was also studied.

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Section: Resultsmentioning

confidence: 99%

Preparation of CdO Rhombus-Like Nanostructure and Its Photocatalytic Degradation of Azo Dyes from Aqueous Solution

Tadjarodi

Imani

Kerdari

et al. 2014

Nanomaterials and Nanotechnology

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“…For the synthesis of the precursor tris(oxalate) ammonium oxyniobate hydrate (NH 4 ) 3 NbO(C 2 O 4 ) 3 H 2 O applied in solidgas reactions, niobium pentoxide, Nb 2 O 5 , (99.9%, CBMM), potassium bisulfate, KHSO 4 was used, (99.9%, SYNTH), ammonium oxalate, C 2 H 8 N 2 O, (99.9%, SYNTH) and oxalic acid, C 2 H 2 O 4 , (99.9%, SYNTH). A typical procedure for the production of said precursor follows the next steps 20 : niobium pentoxide and potassium bisulfate were mixed in a proportion of 1:7 by weight and heated to melting point in crucible platinum.…”

Section: Precursor's Synthesismentioning

confidence: 99%

Production of Niobium Nitride Via Nitrogen-Based Solid-Gas Reaction

et al. 2022

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Nanostructured niobium nitride was synthesized through a solid-gas reaction in an atmosphere of nitrogen and hydrogen using an oxalic niobium precursor. Crystal phases evolution throughout the reactive processes were evaluated using X-Ray Diffraction, reaction parameters modifications were performed in isotherm time, gas flow, and precursors' mass. It was verified the synthesis of a stable NbN material with a hexagonal structure under the following conditions: 1g of precursor, 300 min of isotherm at 1100 °C and, the gas flow of N 2 = 40% (v/v), and H 2 = 60% (v/v). The increase in gas phase flow and the decrease of solid load favored the process, and a pure and single-phase powder was obtained. This set indicates the importance of physical resistance in the fluid-particle interaction process. Under these conditions, the solid obtained had a crystallite size of 30 -50 nm.

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“…A cristalinidade do material analisado foi constatada de caráter não linear a partir da linha de base do difratograma. De acordo com Medeiros [2006], a fase do complexo oxalato de nióbio foi obtida e através de uma análise comparativa com cartas padrões, constatou-se a presença dos picos principais ilustrados segundo os estudos de Su [2009].…”

Section: Método Para Determinação Do íNdice De Acidez Das Amostrasunclassified

Avaliação Do Desempenho Do Complexo Oxalato De Nióbio Na Obtenção De Biodiesel Sob via Metílica

Silva¹,

Souza²,

Oliveira³

et al. 2019

Impactos Das Tecnologias Nas Engenharias 4

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Elaborado por Maurício Amormino Júnior -CRB6/2422O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores.2019 Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.www.atenaeditora.com.br APRESENTAÇÃOCaro leitor(a)Nesta obra temos um compendio de pesquisas realizadas por alunos e professores atuantes em engenharia e tecnologia. São apresentados trabalhos teóricos e vários resultados práticos de diferentes formas de aplicação e abordagens de simulação, projetos e caracterização no âmbito da engenharia e aplicação de tecnologia.Tecnologia é o pilar mais importante da engenharia. Os profissionais que se dedicam a pesquisa e desenvolvimento de novos produtos e processos não estão preocupados com todos os aspectos da tecnologia, mas com a tecnologia existente, bem como com a tecnologia futura considerada viável. Uma visão ampla de tecnologia é portando fundamental para engenheiros. É esta amplitude de áreas e temas que procuramos reunir neste livro.De abordagem objetiva, a obra se mostra de grande relevância para graduandos, alunos de pós-graduação, docentes e profissionais, apresentando temáticas e metodologias diversificadas, em situações reais Aos autores, agradecemos pela confiança e espirito de parceria. Boa leituraFranciele Bonatto

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The thermal decomposition of monohydrated ammonium oxotris (oxalate) niobate

Cited by 19 publications

References 5 publications

Preparation of CdO Rhombus-Like Nanostructure and Its Photocatalytic Degradation of Azo Dyes from Aqueous Solution

Preparation of CdO Rhombus-Like Nanostructure and Its Photocatalytic Degradation of Azo Dyes from Aqueous Solution

Production of Niobium Nitride Via Nitrogen-Based Solid-Gas Reaction

Avaliação Do Desempenho Do Complexo Oxalato De Nióbio Na Obtenção De Biodiesel Sob via Metílica

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