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

要旨

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.

材料

製品番号

ブランド

製品内容

P11409

Sigma-Aldrich

フェナントレン, 98%

348791

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チタン, foil, thickness 0.127 mm, 99.7% trace metals basis

366994

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

267503

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チタン, foil, thickness 0.25 mm, 99.7% trace metals basis

268496

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チタン, powder, −100 mesh, 99.7% trace metals basis

48569

Supelco

フェナントレン, analytical standard, for environmental analysis

695114

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フェナントレン, sublimed grade, ≥99.5%

268526

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チタン, sponge, 1-20 mm, 99.5% trace metals basis

460400

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チタン, wire, diam. 0.25 mm, 99.7% trace metals basis

GF16031843

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369489

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348848

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348805

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767506

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460397

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チタン, foil, thickness 0.127 mm, ≥99.99% trace metals basis

267481

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チタン, foil, thickness 0.25 mm, 99.99% trace metals basis

266035

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チタン, wire, diam. 1.0 mm, 99.99% trace metals basis

305812

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チタン, 5-10 mm, ≥99.99% trace metals basis (purity exclusive of Na and K content)

348864

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267902

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433667

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