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The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel
- Source :
- Materials, Materials, Vol 11, Iss 3, p 373 (2018), Materials; Volume 11; Issue 3; Pages: 373
- Publication Year :
- 2018
- Publisher :
- MDPI, 2018.
-
Abstract
- The biodegradable polysaccharide chitosan possesses protonated and natural amino groups at medium pH values and has therefore been used as an adsorbing material for nickel salts in water treatment. Nickel is a problematic heavy metal ion which can cause various diseases and disorders in living organisms. Here, we show the influence of oxyanions (e.g., nitrate and sulfate) to the adsorption of nickel ions. Hence, simultaneously we are addressing the increasing global problem of nitrate and sulfate ion pollution in groundwater and surface water. A series of adsorption experiments was carried out in order to determine (i) the adsorption equilibrium, (ii) the adsorption capacity in dependence on the initial nickel ion concentration, and (iii) the influence of the anion presented in solution for the adsorption capacity. Surface morphology of chitosan flakes before and after the adsorption process has been studied with SEM-EDX analysis. The chitosan flakes exhibited promising adsorption capacities of 81.9 mg·g−1 and 21.2 mg·g−1 for nickel (sulfate) and nickel (nitrate), respectively. The calculated values of Gibbs free energy change ΔG0 confirm the higher adsorption of nickel ions in presence of sulfate ions. Hence, higher anion valence leads to a higher adsorption capacity.
- Subjects :
- oxyanion adsorption
nickel adsorption
Inorganic chemistry
polysaccharides
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
01 natural sciences
lcsh:Technology
Article
Ion
Metal
chemistry.chemical_compound
symbols.namesake
Adsorption
Nitrate
natural polymers
General Materials Science
Sulfate
lcsh:Microscopy
lcsh:QC120-168.85
waste water
lcsh:QH201-278.5
lcsh:T
chitosan
adsorption kinetics
021001 nanoscience & nanotechnology
0104 chemical sciences
Gibbs free energy
Nickel
chemistry
lcsh:TA1-2040
visual_art
visual_art.visual_art_medium
symbols
Water treatment
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
0210 nano-technology
lcsh:Engineering (General). Civil engineering (General)
lcsh:TK1-9971
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 11
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....6e53cfc23f667cf621649603bcd7cadf