A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A magnetic core-shell dodecyl sulfate intercalated layered double hydroxide nanocomposite for the adsorption of cationic and anionic organic dyes
Abstract A magnetic dodecyl sulfate (DS−) anions intercalated layered double hydroxide (LDH) nanocomposite, Fe3O4@(DS-LDH), was synthesized by coprecipitation-ion exchange method. The Fe3O4@(DS-LDH) nanocomposite was characterized and the results showed that the Fe3O4@(DS-LDH) particles possessed core (Fe3O4)-shell (DS-LDH) structures and magnetic properties, and DS− anions were successfully introduced into LDH interlayers. Adsorption of cationic methylene blue (MB) or anionic methyl orange (MO) by Fe3O4@(DS-LDH) were comprehensively clarified with magnetic separation in (MB or MO) sole and (MB + Cu(II) or MO + Cu(II)) binary solutions by adsorption kinetics, thermodynamic and isotherm models. The adsorption of both MB and MO on Fe3O4@(DS-LDH) were governed by the pseudo-second-order kinetic model. The adsorption isotherm data for MB (in sole and binary solutions) and MO in binary solution agreed well with the Freundlich model, and that for MO in sole solution was accorded with the linear model. MB uptake decreased with the addition of Cu(II) ions, whereas the existence of Cu(II) ions enhanced MO removal. According to the adsorption mechanism investigation by XRD and XPS analysis, the main driving force for MB/MO adsorption, the hydrophobic interaction between MB/MO molecules and the three-dimensional hydrophobic region formed by DS−anions in LDH interlayers of Fe3O4@(DS-LDH), was proposed; Cu(II) ions could act as a bridge between Fe3O4@(DS-LDH) and MO, which slightly enhanced MO adsorption; whereas, the adsorption capacity for MB decreased in the presence of Cu(II) ions due to competitive adsorption.
Graphical abstract Display Omitted
Highlights Fe3O4@(DS-LDH) nanocomposites were prepared by ion exchange method. Fe3O4@(DS-LDH) particles had core-shell structures and magnetic properties. The adsorption behaviors of Fe3O4@(DS-LDH) for MB/MO with or without Cu(II) were investigated. The adsorption capacity of Fe3O4@(DS-LDH) for MO (MB) increased (decreased) with the addition of Cu(II). Fe3O4@(DS-LDH) may be a magnetic adsorbent to efficiently remove organic dyes from organic dye-heavy metal pollutants.
A magnetic core-shell dodecyl sulfate intercalated layered double hydroxide nanocomposite for the adsorption of cationic and anionic organic dyes
Abstract A magnetic dodecyl sulfate (DS−) anions intercalated layered double hydroxide (LDH) nanocomposite, Fe3O4@(DS-LDH), was synthesized by coprecipitation-ion exchange method. The Fe3O4@(DS-LDH) nanocomposite was characterized and the results showed that the Fe3O4@(DS-LDH) particles possessed core (Fe3O4)-shell (DS-LDH) structures and magnetic properties, and DS− anions were successfully introduced into LDH interlayers. Adsorption of cationic methylene blue (MB) or anionic methyl orange (MO) by Fe3O4@(DS-LDH) were comprehensively clarified with magnetic separation in (MB or MO) sole and (MB + Cu(II) or MO + Cu(II)) binary solutions by adsorption kinetics, thermodynamic and isotherm models. The adsorption of both MB and MO on Fe3O4@(DS-LDH) were governed by the pseudo-second-order kinetic model. The adsorption isotherm data for MB (in sole and binary solutions) and MO in binary solution agreed well with the Freundlich model, and that for MO in sole solution was accorded with the linear model. MB uptake decreased with the addition of Cu(II) ions, whereas the existence of Cu(II) ions enhanced MO removal. According to the adsorption mechanism investigation by XRD and XPS analysis, the main driving force for MB/MO adsorption, the hydrophobic interaction between MB/MO molecules and the three-dimensional hydrophobic region formed by DS−anions in LDH interlayers of Fe3O4@(DS-LDH), was proposed; Cu(II) ions could act as a bridge between Fe3O4@(DS-LDH) and MO, which slightly enhanced MO adsorption; whereas, the adsorption capacity for MB decreased in the presence of Cu(II) ions due to competitive adsorption.
Graphical abstract Display Omitted
Highlights Fe3O4@(DS-LDH) nanocomposites were prepared by ion exchange method. Fe3O4@(DS-LDH) particles had core-shell structures and magnetic properties. The adsorption behaviors of Fe3O4@(DS-LDH) for MB/MO with or without Cu(II) were investigated. The adsorption capacity of Fe3O4@(DS-LDH) for MO (MB) increased (decreased) with the addition of Cu(II). Fe3O4@(DS-LDH) may be a magnetic adsorbent to efficiently remove organic dyes from organic dye-heavy metal pollutants.
A magnetic core-shell dodecyl sulfate intercalated layered double hydroxide nanocomposite for the adsorption of cationic and anionic organic dyes
Li, Yan (author) / Bi, Hao-Yu (author) / Liang, Ya-Qin (author) / Mao, Xiao-Ming (author) / Li, Hui (author)
Applied Clay Science ; 183
2019-09-18
Article (Journal)
Electronic Resource
English