Fabrication of Fe3O4/SiO2 core/shell nanoparticles attached to graphene oxide and its use as an adsorbent

Yao, Yunjin; Miao, Shiding; Yu, Shaoming; Li, Ping; Sun, Hongqi; Wang, Shaobin

doi:10.1016/j.jcis.2012.04.030

Cited by 199 publications

(80 citation statements)

References 33 publications

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“…Based on the value of DH°, the adsorption of Cr (VI) ions on to graphene was a physisorption process. The negative value of DG°over the entire temperature range indicates that Cr (VI) ions adsorption onto the graphene was thermodynamically feasible and can occur spontaneously (Gupta and Nayak 2012;Yao et al 2012).…”

Section: Adsorption Isotherm and Thermodynamic Propertiesmentioning

confidence: 99%

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Goharshadi

Moghaddam

2015

Int. J. Environ. Sci. Technol.

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In the present study, a batch system was used to investigate the adsorption of chromium (VI) ions from an aqueous solution by graphene nanosheets. Graphene is decorated with functional groups containing oxygen such as epoxy and hydroxyl on the basal plane. The large negative charge density available on graphene causes effective adsorption of chromium (VI) ions from aqueous solutions. The adsorption capacity and rate of chromium (VI) ions at different temperatures, adsorbent dosages, initial concentrations, and contact times were evaluated. The kinetic study illustrated that the adsorption of chromium (VI) ions onto graphene obeys the pseudo-second-order model with activation energy of 21.91 kJ mol -1 . The chromium (VI) ions adsorption was well explained using Dubinin-Radushkevich isotherm model. The values of standard enthalpy, entropy, and Gibbs free energy changes at 25°C were calculated as 686.07 kJ mol -1 , 2.38 kJ mol -1 K -1 , and -22.43 kJ mol -1 , respectively. In this work, graphene was prepared via a green method. Transmission electron microscopy, Fourier transform-infrared spectroscopy, energy-dispersive X-ray analysis, powder X-ray diffraction, Boehm's titration, and N 2 adsorption-desorption techniques revealed a high-quality few-layer nanosheets of graphene with surface area and inter-planar spacing of 594.7 m 2 g -1 and 3.6 Å , respectively.

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Section: Adsorption Isotherm and Thermodynamic Propertiesmentioning

confidence: 99%

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Goharshadi

Moghaddam

2015

Int. J. Environ. Sci. Technol.

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“…Among these metal oxides used as supercapacitor, the research on Fe 2 O 3 is relatively rare, however, Fe 2 O 3 is abundant, low cost, and nontoxic and is therefore deserves being investigated as supercapacitors [25,26]. Recently, lots of work, which focused on ferric nanocomposite, have been reported [27][28][29][30][31][32][33][34][35][36][37][38][39]. Among them, ferric and graphene nanocomposite are newly reported.…”

Section: Introductionmentioning

confidence: 99%

Facilely synthesized Fe2O3–graphene nanocomposite as novel electrode materials for supercapacitors with high performance

Wang

et al. 2013

Journal of Alloys and Compounds

144

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a b s t r a c tFe 2 O 3 -graphene nanocomposite with high capacitive properties had been prepared friendly and facilely by hydrothermal method in one-step. The morphology and structure of the obtained material were examined by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron microscope (TEM) techniques. It was revealed by TEM images that Fe 2 O 3 nanoparticles grow well on the surface of graphene and the formation of Fe 2 O 3 nanoparticles hinders the aggregation of graphene (reduced graphene oxide, namely, RGO). Electrochemical properties of the synthesized materials were characterized by serials of electrochemical measurements in 1 M Na 2 SO 4 electrolyte. Fe 2 O 3 -graphene nanocomposite electrode show higher specific capacitance than graphene, indicating an accelerative effect of Fe 2 O 3 and graphene on improving the electrochemical performance of the electrode. The specific capacitance of Fe 2 O 3 -graphene nanocomposite is 226 F/g at a current density of 1 A/g. These attractive results indicate it is possible to seek and develop the promising, environmentally benign and commercial electrodes material based on Fe 2 O 3 and graphene.Crown

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“…Analisando a influência do APTMS, observou-se que a amostra apresentou dois eventos principais: i) o primeiro entre 40 e 165 °C, correspondente à perda de água livre adsorvida na superfície das nanopartículas; e ii) entre 189 e 500 °C, atribuído à perda dos grupos funcionais C-H, C=O, CH 2 e CH 3 da cadeia carbônica do agente silano (APTMS) e à decomposição residual dos demais componentes do recobrimento orgânico (Si-O e N-O). Tais eventos são reportados em [53]. A perda de massa total foi cerca de 20%, evidenciando o efeito de que o processo de silanização aumentou a perda de massa, o que já era esperado uma vez que as nanopartículas foram recobertas por um material organometálico (APTMS).…”

Section: Resultsunclassified

Modificação da superfície de nanocompósitos de Fe2O3/Fe3O4 visando seu uso para imobilização da glicose oxidase

et al. 2017

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INTRODUÇÃOAs nanopartículas magnéticas (NPMs) Químico, Sabará, MG, patytaraujo@gmail.com, daniel.r.cornejo@gmail.com, dbrandao@jhs.med.br, libiaconrado@yahoo.com.br, ana.costa@ufcg.edu.br Resumo O aumento no número de pessoas portadoras de diabetes nos últimos anos e a elevada relação custo benefício da tecnologia de biossensores existentes têm motivado um crescente interesse no desenvolvimento de biossensores de detecção de glicose baseados na imobilização da glicose oxidase (GOD) utilizando-se principalmente nanopartículas magnéticas. Neste contexto, nanocompósitos de Fe 2 O 3 /Fe 3 O 4 foram sintetizados por reação de combustão e tiveram sua superfície modificada com 3-aminopropiltrimetoxissilano via reação de silanização e com quitosana via reação de funcionalização para obter um material híbrido que foi avaliado como possível imobilizador de GOD. As amostras foram caracterizadas por difração de raios X, espectroscopia de infravermelho com transformada de Fourier, análise termogravimétrica, microscopia eletrônica de varredura e de transmissão, propriedades magnéticas e citotoxidade in vitro. Os resultados mostraram que foi possível obter o compósito ferrimagnético, a modificação da superfície reduziu a magnetização de saturação, mas manteve a característica ferrimagnetica, e todas as amostras foram consideradas não tóxicas. Para os testes preliminares de imobilização da GOD foi revelado que o nanocompósito modificado com silano e quitosana apresentou melhor resultado, cerca de 2,7 mg de GOD imobilizados para cada 100 mg de nanocompósito, o que torna este material uma possível alternativa para ser utilizado na fabricação de bissensores de GOD. Palavras-chave: nanocompósitos, modificação da superfície, imobilização de GOD. Abstract The increase in the number of people with diabetes in recent years and the high cost-benefit ratio of the existing biosensor technology have increased the interest for the development of glucose detection biosensor based on immobilization of glucose-oxidase (GOD

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Fabrication of Fe3O4/SiO2 core/shell nanoparticles attached to graphene oxide and its use as an adsorbent

Cited by 199 publications

References 33 publications

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Facilely synthesized Fe2O3–graphene nanocomposite as novel electrode materials for supercapacitors with high performance

Modificação da superfície de nanocompósitos de Fe2O3/Fe3O4 visando seu uso para imobilização da glicose oxidase

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