Preferential adsorption of 2,4-dichlorophenoxyacetate from associated binary-solute aqueous systems by Mg/Al-NO3 layered double hydroxides with different nitrate orientations

Adsolubilization of 2,4,6-trichlorophenol from aqueous solution by surfactant intercalated ZnAl layered double hydroxides

“…LDHs possess many excellent properties like interlayer anion-exchange capacity, larger surface area and surface positive charge. These characteristics make LDHs and their calcined products become effective adsorbents to concentrate some anionic inorganic and organic contaminants from wastewater [29][30][31][32][33][34]. With further study of LDHs, anionic surfactants with long alkyl chain can be intercalated into the interlayer.…”

Ni–Al layered double hydroxides modified with citrate, malate, and tartrate: Preparation by coprecipitation and uptake of Cu2+ from aqueous solution

“…; and x is the M 3 þ /(M 2 þ þM 3 þ ) molar ratio (0.20%x%0.33) [1]. For conservation and remediation of water environments, LDHs and calcined LDHs have received attention for application to the removal of inorganic and organic anions such as terephthalate, benzoate, 4-methyl-benzoate, 2,4-dichlorophenoxyacetate, fluoride, chromate, bromide, and dyes from aqueous solutions [2][3][4][5][6][7][8][9][10].…”

Functionalization of Surfaces in Layered Double Hydroxides and Hydroxide Salt Nanoparticles

“…A confirmation of functionalization exclusively based on infrared spectroscopy has not been reported to the best of our knowledge. One of the deepest studies by infrared spectroscopy only determined the orientation of nitrate ions with respect to the layers [67] and the different anion-exchange ability influenced by such orientation [68]; however, the substitution of hydroxyl groups was not detected according to elemental analysis. On the contrary, the infrared spectra on LHS, in several cases supported by X-ray diffraction, were enough techniques to determine that hydroxyl sites were substituted by other anions, resulting in the structure depicted in Figure 1d.…”

“…A property derived from the direct graft of nitrate anions is that nitrate functionalizing the layers in Figure 8 has a restricted rotation degree unlike that in the LDH where nitrate is free and therefore two orientations can be adopted, one parallel and another perpendicular to the layers. Further, these two orientations influence physicochemical properties evidenced by the different anion-exchange ability [67,68].…”