Uptake of Bisphenol A from Aqueous Solution by Mg–Al-Layered Double Hydroxides Intercalated with 2-Naphthalene Sulfonate and 2,6-Naphthalene Disulfonate

Abstract

Mg-Al-layered double hydroxides (Mg-Al LDHs) modified with aromatic anions were suspended in solutions of bisphenol A to investigate their properties as scavengers. The Mg-Al LDHs were intercalated with 2-naphthalene sulfonate (2-NS À ) and 2,6-naphthalene disulfonate (2,6-NDS 2À ) ions, which contain a naphthalene ring with one and two sulfonate (-SO 3 À ) groups in their respective structures. The changes in the concentrations of the hazardous aromatic compounds in the suspensions with time were followed. The organic-modified Mg-Al LDHs decreased the bisphenol A concentrations very rapidly, which was attributable to the association between the aromatic ring of bisphenol A and the aromatic anions intercalated in the interlayer. Mg-Al LDH with lower content of aromatic anion in the interlayer was superior to that with the higher content for the uptake of bisphenol A. This was attributed to the larger spaces to accommodate more bisphenol A in the interlayer.

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

“…For example, LDHs intercalated with anionic surfactants and aromatic anions can take up pesticides and chlorinated organic pollutants from aqueous solution [11][12][13][14][15]. LDHs intercalated with alkylsulfate, 2-naphthalene sulfonate, and 2,6-naphthalene disulfonate can take up bisphenol A and N,N-dimethylaniline from aqueous solution [16][17][18][19]. Furthermore, LDHs intercalated with 2,7-naphthalene disulfonate can selectively take up hazardous aromatics from aqueous solution via p-p stacking interactions between the aromatic rings of the hazardous aromatics and those of the LDHs [20,21].…”

Preparation of an anion dye intercalated into layered double hydroxides and its controllable luminescence properties

“…LDH materials have been extensively studied in the areas of catalysis [10,11], separation technology [12,13], drug delivery [14,15] and functional materials [16,17]. Synthesis of organic-inorganic hybrid materials based on LDHs has attracted much attention, for these materials may show special physicochemical characteristics which are not present in the individual components alone.…”

Kinetics and equilibrium studies on the treatment of nitric acid with Mg–Al oxide obtained by thermal decomposition of NO3--intercalated Mg–Al layered double hydroxide

“…LDHs modified with organic acid anions have also been studied for their ability to uptake hazardous organic materials from aqueous solution via hydrophobic interactions. For example, LDHs intercalated with alkylsulfate, 2-naphthalene sulfonate, and 2,6-naphthalene disulfonate can take up bisphenol A and N,Ndimethylaniline from aqueous solution [19][20][21][22]. Furthermore, LDHs intercalated with 2,7-naphthalene disulfonate can selectively take up hazardous aromatics from aqueous solution via p-p stacking interactions between the aromatic rings of the hazardous aromatics and those of the LDHs [23,24].…”