Benzimidazole adsorption on the external and interlayer surfaces of raw and treated montmorillonite

Sánchez, Rosa M. Torres; Genet, M.; Gaigneaux, Éric M.; Afonso, Marı́a dos Santos; Yunes, S.

doi:10.1016/j.clay.2010.06.026

Cited by 51 publications

(23 citation statements)

References 48 publications

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“…Otherwise, the two nitrogen atoms in benzimidazole are indistinguishable N-C and N=C; several authors attributed to two shoulders one of them to benzimidazole and other for benzimidazole anion which generated a copper compound immersed in ethanol solution [55]. Other authors study the interaction between montmorillonite and thiabendazole and benzimidazole and the high resolution N 1s spectra is decomposed in two components centred at 399 and 401 eV which have been attributed to non-protonated and protonated nitrogen [56,57]. In our case the high resolution N 1s spectra for the d-GO materials resolved into three peaks at 401.88, 400.70 and 399.69 eV (figures 8(d), (f) and (h)) as previously proposed.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Effect of different coupling agents in the doping of graphite oxide with 3–3′ diaminobenzidine: textural, structural and electrical properties

Cervantes‐Cuevas

Jiménez-Hernández

Chávez-Esquivel

et al. 2020

Mater. Res. Express

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The doping reactions of graphite oxide (GO) with 3-3′-diaminobenzidine (DAB) were studied using N, N′-dicyclohexylcarbodiimide (DCC), cyanuric chloride (CC) and hexafluorophosphate (HATU) as coupling agents. The bifunctionality of the coupling agents aid to interact GO functional groups with amino groups of DAB without being part of the final product. The doped materials (d-GO) and GO were characterized by thermogravimetric analysis, x-ray diffraction, FTIR/Raman spectroscopy, x-ray photoelectron, high-resolution electron microscopy and cyclic voltammetry. The GO-HATU material was more thermally stable than other graphitic material, with at 10% weight loss at 300°C, this thermal stability is related to a more difficult intramolecular physisorbed water removal process than the other d-GO materials. GO-CC and GO-HATU materials presented 8.2 and 8.0 Å of interlayer spacing, which was associated with a good oxidation-doping process. Besides, these two materials showed modifications in the vibrations by FTIR technique, corresponding to epoxy and hydroxyl groups of the GO being more susceptible to react with the amino groups. Moreover, I D /I G ratio calculated by Raman Spectroscopy presents the following trend 0.70, 0.94, 0.97 and 1.04 for GO, GO-CC, GO-DCC and GO-HATU, respectively, this increase is related with a major disorder during the doping process. XPS analysis shows C-N and N=C bands for high resolution of C 1s and N 1s, respectively, for d-GO materials. This possibly suggests the formation of benzimidazoles during the oxidation-doping process, this generates a similar -non-lattice and -lattice oxygen amount for O 1s related to crosslinking between the functional groups of GO and DAB which improve the electronic mobility between the surface and the bulk of the final graphitic material. Finally, the obtained d-GO materials were investigated as a working electrode for electrochemical capacitors and all of them showed typical capacitive behaviour. applications, including conductive polymer composites [2] supercapacitors [3], molecular, electrochemical, or biochemical sensors [4], antigen biosensors [5], lithium storage materials [6], amongst others.GO's diverse physicochemical properties are due to the synthesis method and the degree of oxidation generating disorganization of the structure. The oxidation exhibits lamellar structure with randomly distributed unoxidized aromatic regions (sp 2 -carbon atoms), six-membered aliphatic regions (sp 3 -carbon atoms), GO's interlayer spacing is about two times larger at ∼0.7 nm than that of graphite [7]. The space between layers results in different hydration capacities with intermolecular attraction type Van der Waals forces. The interlayer spacing caused by the oxidation process generates ortho-quinone, ketone, para-quinone, carboxyl, hydroxyl and epoxy functional groups, which are capable of facilitating a broad range of synthetic transformations. Popular synthesis methods are Brodie, Staudenmaier, Staudenmaier-Hofmann-Hamdi and Hummer, this last method being one of th...

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Section: Raman Spectroscopymentioning

confidence: 99%

Effect of different coupling agents in the doping of graphite oxide with 3–3′ diaminobenzidine: textural, structural and electrical properties

Cervantes‐Cuevas

Jiménez-Hernández

Chávez-Esquivel

et al. 2020

Mater. Res. Express

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“…[15] In a series of previous papers, herbicides such as glyphosate (N-phosphonomethyl glycine) and diuron [3-(3, 4-diclhorophenyl)-1, 1-dimethylurease], and fungicides such as benzimidazole [2-(thiazol-4-yl)] were adsorbed on raw and thermally or mechanically treated MMT clay, where the importance of their outer and inner (interlayer) surface sites was revealed. [24] Particularly, the glyphosate adsorption isotherms showed two well-defined step profiles, indicating its adsorption on the outer surface (related to aluminol and/or silanol groups) and on the interlayer space or inner surface (by a cationic exchange mechanism [25] ). Two different techniques have proved to be skillful to follow the presence of surfactant or organic molecules in the inner and outer surface of the MMT.…”

Section: Introductionmentioning

confidence: 96%

“…Two different techniques have proved to be skillful to follow the presence of surfactant or organic molecules in the inner and outer surface of the MMT. X-ray diffraction (XRD) and Zeta potential measurements indicated, the arrangement of surfactants in the interlayer space by measuring the shift of basal spacing reflection (001), [20,26] and revealing their adsorption on the outer surface, [24] respectively.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and characterization of MCPA on DDTMA- and raw-montmorillonite: Surface sites involved

Santiago¹,

Fernández²,

Sánchez³

2016

Journal of Environmental Science and Health, Part B

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The 4-chloro-2-methylphenoxy acid (MCPA) is an herbicide widely used in agriculture, which generates a great concern about contamination of surface water and serious consequences for human health and the environment. In this work, the adsorption of MCPA on an Argentine montmorillonite (MMT) and its organo-montmorillonite product (OMMT) with different dodecyl trimethyl ammonium loading was investigated. MCPA adsorption on OMMT increases at least 3 times, with respect to the amount determined for MMT. X-ray diffraction and zeta potential analyses indicated the inner (interlayer) and outer surface participate as adsorption sites. Changes in surface electric charge and also interlayer expansion suggest that dimethyl amine (MCPA counterion) was also surface-adsorbed. The larger aggregates of OMMT, without and with MCPA, obtained compared to those of MMT samples, generate an improvement in the coagulation efficiency. This property, particularly after MCPA retention, allows an easier separation of the solids from the solution and enables a simple technological process application.

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“…Each different clay and each one of the four groups of ten clay minerals has a specific name and different processes were also used to obtain the clay structure. 7 Clay minerals are hydrated silicates of Al, Fe, and Mg, with layered crystalline structures (phyllosilicates), made up of continuous sheets of SiO 4 tetrahedrons, arranged in a hexagonal shape, condensed with octahedral sheets of trivalent and divalent metal hydroxides. 8 Bentonites are clays of the montmorillonite group, whose members possess interlayer cations such as Na + and Ca 2+ .…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization of Bentonite Clay/Activated Charcoal Composites and 2³Factorial Design Application in Adsorption Studies of Methylene Blue Dye

Chagas¹,

Meira²,

Anaissi³

et al. 2014

Revista Virtual De Química

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Preparação e Caracterização de Compósitos de Argila Bentonita/Carvão Ativado e Aplicação de Planejamento Fatorial 2 3 em Estudo de Adsorção do Corante Azul de Metileno Resumo: Nos últimos anos, um grande número de trabalhos envolvendo a preparação e utilização de compósitos de argila tem sido objeto de estudos científicos. Isto é decorrente de uma crescente preocupação social e ambiental, devido a alta taxa de esgotamento dos recursos de petróleo e novas regulamentações ambientais, as quais têm forçado a busca de novos compostos que não ofereçam riscos ao meio ambiente. Desta forma, neste trabalho descrevemos a preparação e caracterização de compósitos de argila/carvão ativado (AC) e dos seus precursores por técnicas como difração de raios X (DRX), microscopia eletrônica de varredura com espectroscopia dispersiva de energia (MEV-EDS), análise térmica (TG-DTA). O perfil de DRX dos compósitos mostrou características diferentes dos seus precursores argila e carvão ativado, ocorre um deslocamento dos picos de difração, sugerindo intercalação de carvão entre as camadas de argila. As condições ótimas para a adsorção do corante azul de metileno pelo compósito AC 50 foram determinadas por planejamento fatorial. A maior eficiência de adsorção foi obtida nas condições de temperatura de 40 °C, pH 8,0, e força iônica igual a 0,01.

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Benzimidazole adsorption on the external and interlayer surfaces of raw and treated montmorillonite

Cited by 51 publications

References 48 publications

Effect of different coupling agents in the doping of graphite oxide with 3–3′ diaminobenzidine: textural, structural and electrical properties

Effect of different coupling agents in the doping of graphite oxide with 3–3′ diaminobenzidine: textural, structural and electrical properties

Adsorption and characterization of MCPA on DDTMA- and raw-montmorillonite: Surface sites involved

Preparation, Characterization of Bentonite Clay/Activated Charcoal Composites and 2³Factorial Design Application in Adsorption Studies of Methylene Blue Dye

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Benzimidazole adsorption on the external and interlayer surfaces of raw and treated montmorillonite

Cited by 51 publications

References 48 publications

Effect of different coupling agents in the doping of graphite oxide with 3–3′ diaminobenzidine: textural, structural and electrical properties

Effect of different coupling agents in the doping of graphite oxide with 3–3′ diaminobenzidine: textural, structural and electrical properties

Adsorption and characterization of MCPA on DDTMA- and raw-montmorillonite: Surface sites involved

Preparation, Characterization of Bentonite Clay/Activated Charcoal Composites and 23Factorial Design Application in Adsorption Studies of Methylene Blue Dye

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Product

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Preparation, Characterization of Bentonite Clay/Activated Charcoal Composites and 2³Factorial Design Application in Adsorption Studies of Methylene Blue Dye