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Preparation and evaluation of the Ca-Al layered double hydroxide for removal of copper(II), nickel(II), zinc(II), chromium(VI) and phosphate from aqueous solutions
- Source :
- Journal of Environmental Chemical Engineering. 5:5469-5480
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Hydrocalumite (CaAl-LDH) was prepared by the co-precipitation method with different Ca2+/Al3+ molar ratios. Hydrocalumite at the molar ratio of 4:1 Ca2+/Al3+ (4HC) showed to be efficient in the removal of Cu2+, Ni2+ or Zn2+ from the aqueous solution. The products formed between 4HC and the Cu2+, Ni2+ or Zn2+ cations were characterized by atomic absorption, SEM, XRD and IR. The effect of several factors such as pH, dose, contact time and metal concentration were evaluated. The maximum removal capacity was 7.0 mmol g−1 for Cu2+ and Ni2+, and 6.3 mmol g−1 for Zn2+. X-ray diffraction analyses showed that the products formed were CuAl, NiAl and ZnAl LDHs. The 4HC also was applied for removal of metal cations and the oxyanions Cr(VI) or phosphate from the same solution. In solutions containing 400 mg L−1 of Cu2+, Ni2+ or Zn2+ and 200 mg L−1 of Cr(VI) or phosphate (expressed as phosphorus), and in the presence of 1 g L−1 of 4HC, 100% of the metals and 60, 57 and 52% of Cr (VI) or 93, 80 and 92% of phosphate were removed, respectively. The results showed that 4HC has great potential to be used in the treatment of effluents containing metal cations and oxyanions.
- Subjects :
- Aqueous solution
Process Chemistry and Technology
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
Zinc
010402 general chemistry
021001 nanoscience & nanotechnology
Phosphate
01 natural sciences
Pollution
Copper
0104 chemical sciences
Metal
chemistry.chemical_compound
Chromium
chemistry
visual_art
visual_art.visual_art_medium
Chemical Engineering (miscellaneous)
Hydroxide
Qualitative inorganic analysis
0210 nano-technology
Waste Management and Disposal
Subjects
Details
- ISSN :
- 22133437
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- Journal of Environmental Chemical Engineering
- Accession number :
- edsair.doi...........eaef17ffdd0c9df3cab29e26bb1278d9