Influence of the Layer Charge and Clay Particle Size on the Interactions between the Cationic Dye Methylene Blue and Clays in an Aqueous Suspension

Neumann, Miguel G.; Gessner, Fergus; Cavalheiro, Carla Cristina Schmitt; Sartori, Rogério Antônio

doi:10.1006/jcis.2002.8654

Cited by 126 publications

(81 citation statements)

References 43 publications

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“…In contrast to similar investigations on MB/clay composites, [43,46] the structures on GO do not change with adsorption time. It can be concluded that the interaction of MB with the reactive oxygen groups of the GO surface is stronger than that with the surface hydroxyl groups of clays.…”

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confidence: 81%

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The Route to Functional Graphene Oxide

et al. 2010

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We report on an easy-to-use, successful, and reproducible route to synthesize functionalized graphite oxide (GO) and its conversion to graphene-like materials through chemical or thermal reduction of GO. Graphite oxide containing hydroxyl, epoxy, carbonyl, and carboxyl groups loses mainly hydroxyl and epoxy groups during reduction, whereas carboxyl species remain untouched. The interaction of functionalized graphene with fluorescent methylene blue (MB) is investigated and compared to graphite, fully oxidized GO, as well as thermally and chemically reduced GO. Optical absorption and emission spectra of the composites indicate a clear preference for MB interaction with the GO derivatives containing a large number of functional groups (GO and chemically reduced GO), whereas graphite and thermally reduced GO only incorporate a few MB molecules. These findings are consistent with thermogravimetric, X-ray photoelectron spectroscopic, and Raman data recorded at every stage of preparation. The optical data also indicate concentration-dependent aggregation of MB on the GO surface leading to stable MB dimers and trimers. The MB dimers are responsible for fluorescence quenching, which can be controlled by varying the pH value.

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confidence: 81%

“…[43,44] Clays with their layered structures allow a wide range of MB aggregation, including intercalation, [45] cation exchange, [46] and fluorescence labeling. [47] Graphite oxide exhibits a similar layered structure and anionic surface charges to clays.…”

Section: Introductionmentioning

confidence: 99%

The Route to Functional Graphene Oxide

et al. 2010

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“…The characteristic differences between the electronic absorption spectra of monomers, dimers, and higher aggregates have been used to distinguish them. [3][4][5][6][7][8] MB interacts with different materials such as colloids, [8][9][10][11][12] metallic surfaces, [13] silica, [14][15][16] nano-objects, [17,18] polymers, [19] cyclodextrins, [20][21][22] and form complexes with other low-molecular-weight molecules. [22][23][24] Its state of aggregation may change as a consequence of these interactions.…”

Section: Introductionmentioning

confidence: 99%

Binding of Methylene Blue to Polyelectrolytes Containing Sulfonate Groups

Moreno‐Villoslada

Torres

González

et al. 2009

Macro Chemistry & Physics

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The interaction between methylene blue (MB) and poly(sodium 4‐styrenesulfonate) (PSS), poly(sodium vinylsulfonate) (PVS), and the more hydrophobic poly[sodium 2‐(N‐acrylamido)‐2‐methyl‐propanesulfonate] (PAMPS), is investigated. The main driving forces for the interaction with PSS are supposed to be short‐range aromatic/aromatic interactions, which explain the smaller dissociation constant, the resistance to the cleaving effect of NaCl, and the prevention of MB self‐aggregation around the macromolecules under a moderate excess of the polymer. On the contrary, as a consequence of long‐range interactions, a higher local concentration of MB around PAMPS and, more significantly, around PVS results in MB self‐aggregation that can be quenched in the presence of NaCl.magnified image

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“…If the surface charge density is high, then the clay mineral is non-swellable, and, of course, the cations are not exchangeable [22,23]. Consequently, the CEC is small, because only the outer surface is available.…”

Section: Selection Of the Clay Mineralsmentioning

confidence: 99%

New Insights on the Simultaneous Removal by Adsorption on Organoclays of Humic Acid and Phenol

Szabó

Pap

Simon

et al. 2016

Water

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Abstract:The exploitation of thermal water as a heat source in houses and apartments (during winter) is a widely used alternative to natural gas. However, this type of water may contain organic contaminants, which must be removed before releasing the used water into rivers and lakes. Because of the presence of a wide range of pollutants (including phenolic compounds and humates), efficient, cheap removal processes are needed. In order to demonstrate their capability in thermal water cleaning, clay minerals were applied for the removal of phenol and humic acid via adsorption. To determine the most efficient removal strategy for the aforementioned pollutants, the following parameters were investigated: the type of the clay mineral, the organophilization strategy (in situ or pre-organophilization), and the individual or simultaneous removability of the model pollutants. The current study revealed that the applied low cost, in situ prepared clay mineral adsorbents are applicable in the removal of pollutants from thermal water.

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Influence of the Layer Charge and Clay Particle Size on the Interactions between the Cationic Dye Methylene Blue and Clays in an Aqueous Suspension

Cited by 126 publications

References 43 publications

The Route to Functional Graphene Oxide

The Route to Functional Graphene Oxide

Binding of Methylene Blue to Polyelectrolytes Containing Sulfonate Groups

New Insights on the Simultaneous Removal by Adsorption on Organoclays of Humic Acid and Phenol

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