The interaction of phenylphosphonic acid with the surface of goethite: isotherms, kinetics, electrophoretic mobility and ATR-FTIR spectroscopy

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-02-26 DOI:10.1016/j.envpol.2025.125938

Mariana B. Gentile, Sebastián R. Gómez, Marcelo J. Avena, Carina V. Luengo

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Abstract

The increased industrial use of phosphorus-containing substances, such as phenylphosphonic (PhP) acid, have raised significant environmental concerns. This study investigates the interaction of PhP with the surface of goethite, a ubiquitous mineral in soils and natural waters. Adsorption kinetics and isotherms are employed to examine the dynamic and equilibrium conditions of the adsorption process. DFT calculations, ATR-FTIR spectroscopy in a flow cell, and electrophoretic mobility measurements are used to determine the ionization of PhP and the type of binding involved in the PhP-goethite interaction. PhP adsorption decreased by increasing pH. Batch adsorption kinetics coincide with results from ATR-FTIR, showing that the rate-controlling step is the bond formation between PhP and the surface. ATR-FTIR with the flow cell proves to be very powerful for elucidating the process, because the time evolution of the adsorption extent and identity of the adsorbed species can be simultaneously tracked. Regardless of PhP speciation in solution and adsorption time, the adsorbed species is consistently an inner-sphere surface complex, where the phosphonate group establishes a direct P-O-Fe bond with an Fe(III) cation on the surface. These findings provide a comprehensive understanding of the PhP-goethite interaction, offering valuable insights into the environmental mobility of PhP.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.