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Recovery of Nd(III) in coexistence with Fe(III) ions from aqueous phase using functionalized multiwalled carbon nanotubes: An environmental benign approach
- Source :
- Journal of Environmental Chemical Engineering. 4:2103-2113
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- The present paper reports an environmental benign process for the selective adsorption of Nd(III) in presence of Fe(III) on functionalized multiwalled carbon nanotubes (MWCNT) from a synthetic aqueous solution, which can be utilized for the rare earth recovery from scraps or end of life products. Effects of metal ion concentration, aqueous phase acidity (pH), weight of MWCNT, temperature, complexing agents and contact time on the adsorption of Nd(III) and Fe(III) over MWCNT have been studied in detail. The Nd(III) adsorption followed Langmuir isotherm in presence of Fe(III)and showed favourable adsorption at pH 3. The maximum adsorption capacities for Nd(III) and Fe(III) were found to be 44 mg/g and 30.8 mg/g respectively. Pseudo second order kinetics was followed by both Nd(III) and Fe(III) adsorption on MWCNT. For selective adsorption, ascorbic acid was found to be the best among different complexing with a selectivity coefficient of 120 for Nd(III) with respect to Fe(III). The adsorbed ions could be fully desorbed with 0.2 M HCl, indicating the process feasibility in terms of ease of recovery of loaded metal ions as well as regeneration of functionalized MWCNT. This process eliminates the use of hazardous organic solvents for the recovery of rare earths.
- Subjects :
- Aqueous solution
Chemistry
Process Chemistry and Technology
Metal ions in aqueous solution
Inorganic chemistry
Aqueous two-phase system
Langmuir adsorption model
02 engineering and technology
010501 environmental sciences
021001 nanoscience & nanotechnology
Ascorbic acid
01 natural sciences
Pollution
Metal
symbols.namesake
Adsorption
visual_art
Selective adsorption
symbols
visual_art.visual_art_medium
Chemical Engineering (miscellaneous)
0210 nano-technology
Waste Management and Disposal
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 22133437
- Volume :
- 4
- Database :
- OpenAIRE
- Journal :
- Journal of Environmental Chemical Engineering
- Accession number :
- edsair.doi...........e2204faa15338648ba1f7efcf305be48