Factors controlling phosphate interaction with iron oxides

Journal of Environmental Quality
Liping WengTjisse Hiemstra

Abstract

Factors such as pH, solution ion composition, and the presence of natural organic matter (NOM) play a crucial role in the effectiveness of phosphorous adsorption by iron oxides. The interplay between these factors shows a complicated pattern and can sometimes lead to controversial results. With the help of mechanistic modeling and adsorption experiments, the net macroscopic effect of single and combined factors can be better understood and predicted. In the present work, the relative importance of the above-mentioned factors in the adsorption of phosphate was analyzed using modeling and comparison between the model prediction and experimental data. The results show that, under normal soil conditions, pH, concentration of Ca, and the presence of NOM are the most important factors that control adsorption of phosphate to iron oxides. The presence of Ca not only enhances the amount of phosphate adsorbed but also changes the pH dependency of the adsorption. An increase of dissolved organic carbon from 0.5 to 50 mg L can lead to a >50% decrease in the amount of phosphate adsorbed. Silicic acid may decrease phosphate adsorption, but this effect is only important at a very low phosphate concentration, in particular at high pH.

References

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Citations

Jun 12, 2013·Environmental Science & Technology·Yanshan Cui, Liping Weng
Aug 13, 2015·Water Research·Daniela Conidi, Wayne J Parker
Aug 16, 2016·Environmental Science and Pollution Research International·Luca RivoiraMaria Concetta Bruzzoniti
Jan 10, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Daniela ConidiScott Smith
Jul 1, 2017·Water Environment Research : a Research Publication of the Water Environment Federation·Daniela Conidi, Wayne J Parker
Nov 13, 2013·Journal of Environmental Quality·Andrew SharpleyPeter Kleinman
Sep 14, 2019·Environmental Science and Pollution Research International·Géraldine BidarFrancis Douay
Oct 21, 2017·Nature Communications·Rosalia TriasEmmanuelle Gérard
Oct 6, 2020·Journal of Environmental Quality·Pauline WelikheRonald F Turco
May 9, 2012·Journal of Environmental Quality·Anthony R BudaWim J Chardon
Apr 2, 2020·Materials Science & Engineering. C, Materials for Biological Applications·Tatiane CristofoliniTânia B Creczynski-Pasa
Jan 19, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Khalid S HashimRafid Al-Khaddar
May 11, 2020·Advances in Colloid and Interface Science·Luuk KoopalMarcelo Avena
Feb 22, 2021·The Science of the Total Environment·Guannan LuWenxiang He
May 23, 2017·Chemosphere·Ibrahim Abusallout, Guanghui Hua
Jun 17, 2020·Environmental Science & Technology·John BrockgreitensAbdennour Abbas

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