Journal ArticleDOI
Removal of lead, cadmium and zinc from aqueous solutions by precipitation with sodium Di-(n-octyl) phosphinate
TLDR
In this article, the removal of lead, cadmium and zinc from a solution containing the three metals gave a selectivity in the order Zn>Pb>Cd. Predictions of an equilibrium-constant model, using measured solubility products of the precipitates and literature values of stability constants, gave metal removals, loss of precipitating agent, and equilibrium pH in good agreement with measured values.Abstract:
Sodium-di-(n-octyl) phosphinate (NaL) was used as a precipitating agent to remove heavy metals from aqueous nitrate solutions. Cadmium, zinc and mixtures of lead, cadmium and zinc were precipitated in the form of PbL 2(s) , CdL 2(s) , and ZnL 2(s) . Lowering the pH of the feed solution reduced the removal of the metals as some of the phosphinate precipitated in the acid form as HL (s) . The removal of lead, cadmium, and zinc, from a solution containing the three metals gave a selectivity in the order Zn>Pb>Cd. Predictions of an equilibrium-constant model, using measured solubility products of the precipitates and literature values of stability constants, gave metal removals, loss of precipitating agent, and equilibrium pH in good agreement with measured values.read more
Citations
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Removal of lead (II) and copper (II) from aqueous solution using pomegranate peel as a new adsorbent
TL;DR: In this article, the effective removal of heavy metals from aqueous wastes is among the most important issues for many industrialized countries, and the results indicate that the second-order model best describes adsorption kinetic data.
Journal ArticleDOI
Equilibrium and kinetics of biosorption of cadmium(II) and copper(II) ions by wheat straw
TL;DR: The apparent temperature independence and the strong pH dependence of the amount of metal ions adsorbed along with moderate mean free energies of biosorption altogether indicate that bios orption of Cd(2+) and Cu(2+ by wheat straw might follow a chemisorption mechanism.
Journal ArticleDOI
Batch Sorption Experiments: Langmuir and Freundlich Isotherm Studies for the Adsorption of Textile Metal Ions onto Teff Straw (Eragrostis tef) Agricultural Waste
TL;DR: In this article, the results indicate that the freely abundant, locally available, low-cost adsorbent, Teff straw can be treated as economically viable for the removal of metal ions from textile effluents.
Journal ArticleDOI
Adsorption of heavy metal ions from aqueous solution by carboxylated cellulose nanocrystals
TL;DR: In this article, a novel nanoadsorbent for the removal of heavy metal ions is reported, which was first hydrolyzed to obtain cellulose nanocrystals (CNCs) and then chemically modified with succinic anhydride to obtain SCNCs.
Journal ArticleDOI
Modified chitosan and calcium alginate biopolymer sorbents for removal of nickel (II) through adsorption
TL;DR: In this paper, the effect of adsorption of Ni (II) ions on aqueous solutions through removal of nickel (II), on to biopolymer sorbents, such as calcium alginate (CA), CCCA and chitosan coated silica (CCS), was studied using equilibrium batch and column flow techniques.
References
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Significance of pH and Chloride Concentration on Behavior of Heavy Metal Pollutants: Mercury(II), Cadmium(II), Zinc(II), and Lead(II)
H. C. H. Hahne,W. Kroontje +1 more
TL;DR: In this article, the authors evaluated the significance of hydroxyl and chloride complexes in the formation of heavy metal ion complexes in natural systems and found that both the hydroxy and chloride complex may contribute to the mobilization of these heavy metal ions in the environment.
Journal ArticleDOI
Solvent extraction of cobalt and nickel by organophosphorus acids I. Comparison of phosphoric, phosphonic and phosphonic acid systems
TL;DR: In this paper, the effect of a range of organic phase additives such as isodecanol and tributyl phosphate on the performance of the extraction of cobalt and nickel has been examined.
Book
Metal Recovery from Industrial Waste
TL;DR: In this paper, the principal factors affecting the feasibility of recovering nonferrous metals from industrial wastes are reviewed and major emphasis is on available separation process technologies with potential for metal recovery and the economics of recycling.
Journal ArticleDOI
Cobalt-nickel separation by solvent extraction with bis(2,4,4 trimethylpentyl)phosphinic acid
TL;DR: In this article, the use of an organophosphinic acid to separate cobalt from nickel by solvent extraction is described, and the results of continuous, counter-current, mini-plant tests demonstrate the recovery of high purity cobalt using concentrated nickel sulphate solutions.
Journal ArticleDOI
Chemical speciation of Cd, Cu, Pb, and Zn in mixed freshwater, seawater, and brine solutions
David T. Long,Ernest E. Angino +1 more
TL;DR: In this paper, a theoretical model was developed to study the chemical speciation of the trace elements Zn, Cd, Cu and Pb aqueous solutions and their responses to variations in ionic strength and complexation.