Next Article in Journal
Mechanical Properties of Optimized Diamond Lattice Structure for Bone Scaffolds Fabricated via Selective Laser Melting
Previous Article in Journal
Modification of Physico-Chemical Properties of Acryl-Coated Polypropylene Foils for Food Packaging by Reactive Particles from Oxygen Plasma
Open AccessArticle

The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel

Leibniz-Institut fuer Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 373; https://doi.org/10.3390/ma11030373
Received: 13 January 2018 / Revised: 11 February 2018 / Accepted: 22 February 2018 / Published: 3 March 2018
(This article belongs to the Section Biomaterials)
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. View Full-Text
Keywords: nickel adsorption; oxyanion adsorption; chitosan; natural polymers; polysaccharides; waste water; adsorption kinetics nickel adsorption; oxyanion adsorption; chitosan; natural polymers; polysaccharides; waste water; adsorption kinetics
Show Figures

Graphical abstract

MDPI and ACS Style

Mende, M.; Schwarz, D.; Steinbach, C.; Boldt, R.; Schwarz, S. The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel. Materials 2018, 11, 373.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop