Sol–gel synthesis of TiO2 nanoparticles and photocatalytic degradation of methyl orange in aqueous TiO2 suspensions

Yang, Huaming; Zhang, Ke; Shi, Rongrong; Li, Xianwei; Dong, Xiaodan; Yu, Yongmei

doi:10.1016/j.jallcom.2005.06.061

Cited by 157 publications

(80 citation statements)

References 14 publications

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“…TiO 2 NPs were also synthesized by sol-gel method from titanium alkoxide and adjusting the gelling pH to a value of ~3 pure anatase TiO 2 was obtained [16]. Nano-TiO 2 in anatase form was synthesized by sol-gel method using titanium isobutoxide with 16 nm crystal size [17]. Non-hydrolytic sol-gel reaction between titanium isopropoxide and oleic acid was employed and generated TiO 2 nanorods of uniform dimension with anatase phase [18].…”

Section: Introductionmentioning

confidence: 99%

Influence of precursor type on structural, morphological, dielectric and magnetic properties of TiO2 nanoparticles

Singh¹,

Mukherjee

Ghosh

et al. 2017

Cerâmica

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TiO 2 nanoparticles (NPs) were synthesized by sol-gel methods using two different precursors, titanium tetraisopropoxide and potassium titanium oxalate (KTO). The precursors had a profound influence on the structural, morphological, dielectric and magnetic properties of synthesized TiO 2 NPs, as evidenced by the XRD, FE-SEM, TEM, LCR and VSM studies in the synthesized samples. Alkoxide-derived TiO 2 NPs contained mostly mixed phases of anatase and rutile, whereas KTO-derived TiO 2 NPs contained anatase and Magnéli phases (Ti n O 2n-1 ). After heat treatment at 550 °C, the crystallite size of KTO-derived NPs was lower than alkoxide-derived TiO 2 NPs. The synthesized nanoparticles were spherical and agglomerated having anatase and rutile phases with different proportions in the microstructure of the alkoxide sample. Dielectric constant of the KTO-derived NPs was higher than the alkoxide-derived NPs. Diamagnetic behavior of KTO-derived NPs was also higher than the alkoxide-derived TiO 2 NPs. Keywords: TiO 2 nanoparticles, sol-gel, dielectric constant, grain size, anatase. Resumo Nanopartículas (NPs) de TiO 2 foram sintetizadas por métodos de sol-gel usando dois diferentes precursores, tetraisopropóxido de titânio e oxalato de potássio e titânio (KTO). Os precursores tiveram profunda influência nas propriedades estruturais, morfológicas, dielétricas e magnéticas das NPs de TiO 2 sintetizadas, como evidenciado pelos estudos de DRX, FE-MEV, MET, LCR

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Section: Introductionmentioning

confidence: 99%

Influence of precursor type on structural, morphological, dielectric and magnetic properties of TiO2 nanoparticles

Singh¹,

Mukherjee

Ghosh

et al. 2017

Cerâmica

View full text Add to dashboard Cite

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“…It has been used in various industrial applications such as gas sensors (Atashbar et al, 1997;Tang et al, 1995;Chaudhari et al, 2006), waveguides solar cells (O'Regan et al, 1991) and others (Stroppa et al, 2008). The main methods used in the synthesis of TiO 2 in the literature are: sol-gel (Yang et al, 2006;Hussain et al, 2010), hydrothermal method (Linsebigler et al, 1995), the Pechini method and combustion reaction . The most important chemical properties of this material are those related to polymorphism, amphoteric (Mazloum-Ardakani et al, 2011) and mainly photochemical systems.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Voltammetric Study of a Composite Titanium Phosphate/Nickel Hexacyanoferrate and Its Application in Dipyrone Determination

Cumba¹,

Bicalho²,

Silvestrini³

et al. 2012

IJC

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This paper describes the preparation, characterization and electroanalytical application of a composite consisting of titanium phosphate modified with nickel hexacyanoferrate. Titanium phosphate (TiPh) was formed from the reaction of titanium isopropoxide with H 3 PO 4 and deionized water. Next, the reaction of TiPh was performed with a metal ion (Ni +2 ) and potassium Hexacyanoferrate, designated as TiPhNIHCF. Spectroscopic techniques such as vibrational spectroscopy, X-ray diffraction (XRD), diffuse reflectance and cyclic voltammetry were used to characterize the TiPh and TiPhNiHCF. The graphite paste electrode containing TiPhNiHCF exhibited a redox couple with average potential (E  ') of 0.61V vs Ag/AgCl (KNO 3 1.0 mol L -1 ; v = 20 mV s -1 ) attributed to redox process Fe II (CN) 6 /Fe III (CN) 6 . The redox couple presents a sensitive response for determining dipyrone. The system showed a detection limit of 3.75 x 10 -4 mol L -1 and standard deviation of 1.8 % for n = 3, with an amperometric sensitivity of 34.84 mA / mol L -1 . The modified electrode was electrochemically stable and showed good reproducibility.www.ccsenet.org/ijc

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“…Na literatura existe uma controvérsia a respeito do desempenho fotocatalíticos destas fases. Alguns pesquisadores relatam que a fase anatásio é mais eficiente como fotocatalisador [4,8,9,10]. Porém, outros pesquisadores relatam que pequenos teores da fase rutilo presente com a fase anatásio em amostras de TiO 2 torna o material mais eficiente como fotocatalisador.…”

Section: Introductionunclassified

“…Desta maneira, os principais métodos encontrados na literatura utilizados em sínteses de TiO 2 , destacam-se método Sol-Gel [9,10,12], método Hidrotermal [5,13], método de Precipitação [14], método Pechini [15,16] e reação de Combustão [12,17]. Dos diversos métodos de síntese química, o método Pechini vem sendo disseminado e se destaca por possibilitar a utilização de diferentes temperaturas e diferentes proporções de ácido cítrico e cátions metálicos, permitindo o controle da estequiometria e da morfologia das partículas e/ou aglomerados, para gerar produtos monofásicos e nanométricos [18].…”

Section: Introductionunclassified

Fotocatálise do corante vermelho de metila com TiO2 obtido pelo método Pechini

et al. 2012

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RESUMOO dióxido de titânio tem sido bastante investigado para a remoção de poluentes orgânicos. É um material polimórfico, o qual dependendo das condições e tipo de método de síntese empregado na sua preparação pode ser monofásico ou bifásico, com predominância de uma das fases. Sendo assim, este trabalho propõe a avaliação da estrutura, morfologia e atividade fotocatalítica na degradação do corante vermelho de metila por amostras de TiO 2 sintetizado pelo método Pechini com relação de ácido cítrico/cátion metálico de 4:1 e 6:1.As amostras sintetizadas foram calcinadasa 500ºC por 1hora e foram caracterizadas pela técnica de difração de raios X em amostras policristalinas com o uso do método de refinamento Rietveld, análise textural, microscopia eletrônica de varredura e fotocataliticamente em testes de bancada, usando o corante vermelho de metila. Os resultados obtidos mostraram que a amostra 4:1 levou à formação das duas fases, com 89% da fase anatásio e 11% da fase rutilo, enquanto a amostra 6:1 levou apenas à formação da fase anatásio. A amostra 4:1, que apresentou a mistura da fase anatásio e rutilo demonstrou ser mais eficiente fotocataliticamente do que a amostra 6:1.Palavras-chave: fotocatálise heterogênea, vermelho de metila, dióxido de titânio, método Pechini. ABSTRACTTitanium dioxide has been widely investigated in the removal of organic pollutants. It is a polymorphic material which, depending on the conditions and the type of synthetic method used in its preparation may be monophasic or biphasic, with predominance of one of the phases. Therefore, this paper proposes the evaluation of the structure, morphology and photocatalytic activity in the degradation of methyl red dye byTiO 2 samples synthesized by the Pechini method with citric acid/metal cation ratios of 4:1 and 6:1. The synthesized samples were calcined at 500°C for 1 hour and were characterized by X-ray powder diffraction technique by using Rietveld refinement, textural analysis, scanning electron microscopy and photocatalytic test sin bench scale, using methyl red dye. The results showed that the sample 4:1 led to the formation of two phases, 89% anatase and 11% rutile, while the sample 6:1 led only to the formation of the anatase phase. The 4:1 sample, a mixture of anatase and rutile phase, photocatalytically, was more effective than the 6:1 sample.

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Sol–gel synthesis of TiO2 nanoparticles and photocatalytic degradation of methyl orange in aqueous TiO2 suspensions

Cited by 157 publications

References 14 publications

Influence of precursor type on structural, morphological, dielectric and magnetic properties of TiO2 nanoparticles

Influence of precursor type on structural, morphological, dielectric and magnetic properties of TiO2 nanoparticles

Preparation and Voltammetric Study of a Composite Titanium Phosphate/Nickel Hexacyanoferrate and Its Application in Dipyrone Determination

Fotocatálise do corante vermelho de metila com TiO2 obtido pelo método Pechini

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