Ionic Strength Effects on Cation Sorption to Oxides: Macroscopic Observations and Their Significance in Microscopic Interpretation

Journal of Colloid and Interface Science
J Lützenkirchen

Abstract

Sorption of metal ions at oxide mineral-water interfaces is a complex process involving many possible variables, one of them being ionic strength. Depending on the system, adsorption of metal ions at these interfaces has been reported to increase or decrease with increasing ionic strength. However, in most cases it appears to be insensitive to ionic strength. Insensitivity to ionic strength has been taken as an indication for inner sphere surface complexation. Decrease of sorption with increasing ionic strength has been interpreted as outer sphere surface complexation. Promotive effects of ionic strength have not been discussed at all in terms of conventional surface complexation theory. The present paper shows that the classical example of Ba sorption to goethite, where increasing ionic strength decreases Ba adsorption, can be alternatively explained by an inner sphere mechanism if ion pair formation in solution between Ba and nitrate of the swamping electrolyte is taken into account. This suggests that macroscopic observations in cation uptake experiments should not be used to obtain mechanistic interpretations, even for ionic strength effects. Promotive effects of ionic strength on Cd sorption to goethite are also discussed....Continue Reading

Citations

Feb 23, 2010·Journal of Colloid and Interface Science·C Moreno-CastillaM V López-Ramón
May 18, 1999·Journal of Colloid and Interface Science·B Nowack, A T Stone
Feb 1, 2013·Chemical Reviews·Horst GeckeisMoritz Schmidt
Jun 14, 2012·Environmental Science and Pollution Research International·M MhamdiM Trabelsi-Ayadi
Jul 10, 2019·Environmental Technology·Zhiyuan WanHuifang Wu
Jul 3, 2021·Chemical Communications : Chem Comm·Nitin Khandelwal, Gopala Krishna Darbha
Apr 2, 2003·Environmental Science & Technology·Paras TrivediDonald L Sparks

❮ Previous
Next ❯

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

© 2021 Meta ULC. All rights reserved