We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Single/synchronous adsorption of Cu(II), Cd(II) and Cr(VI) in water by layered double hydroxides doped with different divalent metals.
- Authors
Xiao-tong Chen; Xing-peng Liu; Hui-qiang Li; Di Bao; Ping Yang
- Abstract
Layered double hydroxides (LDHs) are a class of excellent adsorbents for the simultaneous removal of anionic and cationic pollutants in water. In this paper, four types of LDHs doped with different divalent metals were prepared by the co-precipitation method, namely MgAl-LDH, ZnAl-LDH, CaAl-LDH and CoAl-LDH, to explore their adsorption performance for Cu(II), Cd(II) and Cr(VI) respectively. The removal efficiencies of Cu(II) and Cd(II) by MgAl-LDH and CaAl-LDH were higher, and the removal efficiencies of Cr(VI) by MgAl-LDH and CoAl-LDH were higher. In comparison, MgAl-LDH showed the best all-around adsorption performance, and its corresponding optimal dosage was 0.50 g/L. Effects of pH, initial pollutant concentration, coexisting heavy metals and coexisting anions on adsorption by MgAl-LDH were studied. The adsorption behavior of MgAl-LDH was consistent with the pseudo-second-order kinetic model and the Freundlich isotherm model. In the synchronous adsorption system, the removal efficiencies of MgAl-LDH for Cu(II), Cd(II) and Cr(VI) reached 99.50%, 70.28% and 22.50%, respectively. Combined with scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and Brunauer-Emmett-Teller characterization results, the main removal mechanisms of Cu(II), Cd(II) and Cr(VI) were deduced.
- Subjects
LAYERED double hydroxides; LEAD removal (Water purification); TRACE elements in water; HEXAVALENT chromium; ADSORPTION (Chemistry); SCANNING electron microscopy; INFRARED spectroscopy; WATER pollution
- Publication
Desalination & Water Treatment, 2022, Vol 264, p172
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28578