Carbon nanostructures-modified expanded vermiculites produced by chemical vapor deposition from ethanol

Purceno, Aluir D.; Barrioni, Breno Rocha; Dias, Anderson; Costa, Geraldo Magela da; Lago, Rochel M.; Moura, Flávia C.C.

doi:10.1016/j.clay.2011.06.012

Cited by 26 publications

(17 citation statements)

References 10 publications

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“…2 (Fig. 3a), which is consistent with that reported in literature [41]. La 5 EV shows a similar lamellar morphology to that of EV; however, the surface of La 5 EV seems rougher ( Fig.…”

Section: Resultssupporting

confidence: 82%

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Huang

Liu

et al. 2014

Chemical Engineering Journal

275

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract:La(OH) 3 -modified exfoliated vermiculites were fabricated, characterized, and investigated for phosphate removal in batch tests for the first time. The BET surface area of the La 5 EV adsorbent, which was synthesized in the solution consisting of 5.00 mmol/g La/exfoliated vermiculite (EV), was significantly increased, accompanied with a larger pore diameter and greater total pore volume, as compared with the unmodified EV. The phosphate adsorption capacity of La 5 EV was approximately one order of magnitude higher than that of EV. Effects of initial phosphate concentration, contact time, temperature, pH, and 2 co-existing ions on the adsorption capacity of La 5 EV were investigated in detail. The experimental equilibrium data were fitted better by using the Langmuir model (maximum adsorption capacity of 79.6 mg P/g) than the Dubinin-Radushkevich or the Freundlich model, suggesting that the adsorption feature be monolayer. Meanwhile, the phosphate adsorption kinetics could be well described by the pseudo-second-order model, and the adsorption process might be controlled by boundary layer (film) diffusion. ∆G°, ∆H° and ∆S° were also determined, in which it was found that the phosphate adsorption , and SO 4 2-had neglectable effects on its phosphate removal capacities. In the synthetic secondary treated wastewater with a low phosphate concentration of 2 mg P/L, 97.9 % of its final adsorption capacity reached in the first 10 min and the phosphate concentration dramatically decreased below 50 µ g P/L. The spent La 5 EV could be regenerated and reused in phosphate adsorption; that could remove more than 70 % phosphate in the 3 rd adsorption-desorption cycle.

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“…2 (Fig. 3a), which is consistent with that reported in literature [41]. La 5 EV shows a similar lamellar morphology to that of EV; however, the surface of La 5 EV seems rougher ( Fig.…”

Section: Resultssupporting

confidence: 82%

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Huang

Liu

et al. 2014

Chemical Engineering Journal

275

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“…The lamellar clay mineral was first fragmented to form microsheet fragments. The microsheets were then impregnated with iron nitrate and subjected to a CVD process to grow the carbon nanostructures 46,47,53,54 (Figure 15). …”

Section: Iron: a Versatile Element To Produce Materials For Environmementioning

confidence: 99%

Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

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Ferro é um elemento versátil que forma várias fases com diferentes estados de oxidação e estruturas, tais como Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 e FeOOH. Todas estas fases têm propriedades físico-químicas únicas que podem ser usadas para diferentes aplicações. Neste trabalho, descreve-se o uso de diferentes compostos de ferro, sintéticos e também naturais ou de rejeitos, em aplicações ambientais e tecnológicas. Duas áreas principais de pesquisa são descritas. A primeira é relacionada às estratégias para aumentar a reatividade de fases de ferro pela formação de compósitos Fe 0 /Fe óxido e pela introdução de novos metais na estrutura de óxidos de ferro para promover novas reações superficiais. A segunda área de pesquisa é o uso das propriedades magnéticas de algumas fases de ferro para produzir materiais magnéticos versáteis com aplicações focadas em adsorção, catálise e emulsões.Iron is a versatile element forming several phases with different oxidation states and structures, such as Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 and FeOOH. All these phases have unique physicochemical properties which can be used for different applications. In this work, it is described the use of different iron compounds, synthetic and also from natural and waste sources, in environmental and technological applications. Two main research areas are described. The first one is related to strategies to increase the reactivity of Fe phases, mainly by the formation of Fe 0 /iron oxide composites and by the introduction of new metals in the iron oxide structure to promote new surface reactions. The second area is the use of the magnetic properties of some iron phases to produce versatile magnetic materials with focus in adsorption, catalysis and emulsions.

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“…These values were similar to those reported in the literature for CNTs prepared using CVD on NC support, revealing the acceptable quality of the prepared CNTs. 34,35 The relative intensity of the D-band to the G-band (I D / I G > 1) revealed that the MWCNTs were grown on our catalyst rather than single-walled CNTs (SWCNTs). Due to the fact that SWCNTs typically show a stronger intensity of the G-band compared to that of the D-band.…”

Section: Structural Properties Of the Catalystsmentioning

confidence: 99%

Thermal and Morphological Study of Epoxy Matrix with Chemical and Physical Hybrid of Nanoclay/Carbon Nanotube

Esmizadeh

Naderi

Yousefi

et al. 2015

JOM

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Synergistic effects of nanoclay (NC) and carbon nanotube (CNT) as a physical and chemical hybrid on the properties of epoxy matrix were studied. The chemical hybrid of CNT-NC (CNC) was synthesized by high-temperature decomposition of methane on NC supports. The formation of CNTs on the NC surface was confirmed by transmission electron microscopy, scanning electron microscopy (SEM) and Raman spectroscopy. As-prepared CNCs were subsequently added into an epoxy matrix to make epoxy-CNC composites. The mixture of purified CNTs and NC as the physical hybrid of CNT-NC (PNC) was introduced into the epoxy matrix in order to fabricate epoxy-PNC composites. The relationship between the type of filler with the thermal and morphological performance of the epoxy-CNT-NC composite hybrids was investigated. The exfoliation characteristics of NCs and CNTs in epoxy nanocomposites were analyzed using x-ray spectroscopy (EDX) and SEM studies, respectively. Thermal behavior of the epoxy nanocomposites was studied by thermo-gravimetric-differential thermal analysis (TGA/DTG), the heat deflection temperature (HDT) test and dynamic mechanical analysis (DMA). The results indicated that the thermal characteristics of the epoxy including the degradation temperature (T deg ), HDT and glass transition temperature (T g ) relatively increased with the introduction of all the nanofillers, NC, CNT, PNC and CNC. The synergistic effects of CNT and NC were found to be more marked for the chemical hybrid compared to the physical one. In the case of CNC, it was observed that the CNTs attached to the clay sheets form a unique structure in which a 2D NC has several 1D CNTs attached to it. The enhanced homogeneous dispersion of NCs and CNTs in epoxy-CNC was clearly observed compared to epoxy-PNC.

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Carbon nanostructures-modified expanded vermiculites produced by chemical vapor deposition from ethanol

Cited by 26 publications

References 10 publications

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Kinetics, isotherm, thermodynamic, and adsorption mechanism studies of La(OH) 3 -modified exfoliated vermiculites as highly efficient phosphate adsorbents

Iron: a versatile element to produce materials for environmental applications

Thermal and Morphological Study of Epoxy Matrix with Chemical and Physical Hybrid of Nanoclay/Carbon Nanotube

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