Effect of model dissolved organic matter coating on sorption of phenanthrene by TiO2 nanoparticles.

Effect of model dissolved organic matter coating on sorption of phenanthrene by TiO2 nanoparticles.

Environmental pollution (Barking, Essex : 1987) (2014-08-05)

Xilong Wang, Enxing Ma, Xiaofang Shen, Xiaoying Guo, Meng Zhang, Haiyun Zhang, Ye Liu, Fei Cai, Shu Tao, Baoshan Xing

ZUSAMMENFASSUNG

Dissolved organic matter (DOM) may alter the sorption of hydrophobic organic contaminants (HOC) to metal oxide nanoparticles (NPs), but the role of DOM and NP types is poorly understood. Here, phenanthrene sorption was quantified on four types of nano-TiO2 (three rutile, one anatase), and a bulk, raw TiO2 powder. Prior to the sorption experiments, these nanoparticles were coated using four different organic materials: Lignin (LIG), tannic acid (TAN), Congo red (CON), and capsorubin (CAP). Lignin, tannic acid, congo red and capsorubin coating substantially enhanced phenanthrene sorption to various TiO2 particles. After coating with a specific DOM, Kd values by the DOM-coated TiO2 particles on percent organic carbon content and surface area (SA) basis (Koc/SA) generally followed the order: TiO2 NPs with hydrophobic surfaces > bulk TiO2 particles > other TiO2 NPs. Different Koc/SA values of various DOM-TiO2 complexes resulted from distinct conformation of the coated DOM and aggregation.

MATERIALIEN

Produktnummer

Marke

Produktbeschreibung

P11409

Sigma-Aldrich

Phenanthren, 98%

348791

Sigma-Aldrich

Titan, foil, thickness 0.127 mm, 99.7% trace metals basis

366994

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Titan, powder, <45 μm avg. part. size, 99.98% trace metals basis

267503

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Titan, foil, thickness 0.25 mm, 99.7% trace metals basis

268496

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Titan, powder, −100 mesh, 99.7% trace metals basis

48569

Supelco

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695114

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268526

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Titan, sponge, 1-20 mm, 99.5% trace metals basis

460400

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369489

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348848

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GF16031843

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305812

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Titan, rod, 10mm, diameter 50mm, 99.99+%

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