Influence of structural features on sorption of NOM-analogue organic acids to Goethite

Article Abstract:

A study examines the effects of structural features on sorption of NOM-analogue organic acids to Goethite, a crystalline form of iron oxide used as a model mineral. The research was performed using important functional groups of the humic acid component of NOM and the Aldrich humic acid to show comparison between sorption behavior of simple organic acids and NOM in order to detect applicable analogues for modelling NOM sorption. The research determined that sorption of simple aromatic organic acids are most likely influenced by adjacent phenolic groups, adjacent carboxylic groups, phenolic groups in the ortho position relative to a carboxylic group and overall acidity of the compound.

United States, Science & research, Cyclic Crude and Intermediate Manufacturing, Aromatic Acids & Derivatives, Article

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Influence of structural features on sorption of NOM-analogue organic acids to goethite

Article Abstract:

Investigations into the mineral-organic acid interaction that used goethite as a reference mineral and natural organic matter-analogue organic acids to elucidate the role of mineral structural features on sorption dynamics showed a soption behavior analogous to anionic sorbates. This is due to the sorption behavior wherein high sorption activity was manifest at low pH and low sorption activity at high pH. The sorption activity was shown to be regulated by the carboxylic group, adjacent phenolic group and phenolic groups oriented in the ortho position with respect to the carboxylic group.

Research and Development in the Physical, Engineering, and Life Sciences, Ecological Sciences, Environmental aspects, Environmental sciences, Soil absorption and adsorption, Soil science, Environmental chemistry, Soil mineralogy

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Competitive sorption of simple organic acids and sulfate on goethite

Article Abstract:

Sulfate can play a significant role in the sorption of simple organic acids and humic substances in natural aquatic systems. Predictions of sorption in binary-sorbate systems based on single-sorbate data fits agreed with competitive sorption data over a wide range of conditions. The influence of sulfate on the sorption of simple organic acids and humic substances was determined by examining the sorption of phthalic acid, chelidamic acid and sulfate onto goethite in single-sorbate and in sulfate-organic acid binary-sorbate systems.

Sulfates, Organic acids

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