Enhanced adsorption capacity of dyes by surfactant-modified layered double hydroxides from aqueous solution

Organophilic bentonites obtained by microwave heating as adsorbents for anionic dyes

“…A similar result was observed by Yan et al, (2015). It is possible that the electrostatic force is the principal factor in relation to the affinity between the dye and the hybrids, but the amount of the organocations in the hybrid influenced the adsorption (Zhang et al, 2016). Therefore, the maximum removal was close to 206 mg·g -1 for Bent-C14- Considering that many residual waters have pH values in the range of 6.0 to 9.0 (Yan et al, 2015), the hybrids prepared with 200% of the CEC have the advantage with regards to practical applications because pH adjustment of the solution is not necessary.…”

“…Based on zeta potential measurements and the pH isotherms and kinetic and equilibrium models, the preponderant mechanism of adsorption could be electrostatic interaction between the anionic dye and the alkyl ammonium moieties disposed in the interlayer spacing and external surface of the montmorillonite and also the chemisorption process ( Figure SM7) (Zhang et al, 2016). However, the present set of techniques are not conclusive about the chemical forces between the dye and the surface.…”

Influence of the head group on dynamics in surfactant intercalated graphite oxide

“…when b < 1, i.e., n > 0, the loss peak obtained from eqn (5) will have an asymmetric shape and its peak width increases with the decrease of b. E * a governs the lateral shi of the 3 00 peaks in temperature. Fig.…”

“…Recently, organic-intercalated layered solids have been studied in different elds as their new physical and chemical properties are dramatically different from their bulk counterparts such as their electrical properties, 1 mechanical properties, 2 thermal behavior, 3 surface and interfacial properties, 4 and so on. Surfactants are well known for their amphipathic organic molecular structure, which can be used to modify the surface properties of hydrophilic materials, such as layered double hydroxides, 5 layered metal phosphate 6 and two-dimensional layered materials, 4 to mix with the hydrophobic polymer chains to obtain wonderful nanocomposites. Their thermodynamics have signicant practical and theoretical interest, as a result of their congurational complexity, which can be impacted by their concentration, chain length or chemical environment.…”

Bioremediation of dyes using coconut parts via adsorption: a review

“…The adsorption capacity of Methylene Blue by COSHTC3 is low at both pH lesser and greater than 9. This is because at pH greater than 9, there are excessive hydroxide ions causes repulsion that hinders the smooth adsorption of cationic dye on the COSHTC3 [49]. Meanwhile, the low adsorption of Methylene Blue by COSHTC3 is low at pH lesser than 9 and this is because the sites provided by the adsorbent are taken up by the H + ions that is smaller than cationic dye molecules [44,50].…”