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

ABSTRACT

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.

MATERIALS

Product Number

Brand

Product Description

348848

Sigma-Aldrich

Titanium, foil, thickness 0.025 mm, 99.98% trace metals basis

266035

Sigma-Aldrich

Titanium, wire, diam. 1.0 mm, 99.99% trace metals basis

IRMM531C

Titanium, IRMM^®, certified reference material, 0.5 mm wire

460400

Sigma-Aldrich

Titanium, wire, diam. 0.25 mm, 99.7% trace metals basis

305812

Sigma-Aldrich

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

369489

Sigma-Aldrich

Titanium, foil, thickness 2.0 mm, 99.7% trace metals basis

348791

Sigma-Aldrich

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

267902

Sigma-Aldrich

Titanium, wire, diam. 0.81 mm, 99.7% trace metals basis

268526

Sigma-Aldrich

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

IRMM531A

Titanium, IRMM^®, certified reference material, 0.1 mm foil

267503

Sigma-Aldrich

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

267481

Sigma-Aldrich

Titanium, foil, thickness 0.25 mm, 99.99% trace metals basis

347132

Sigma-Aldrich

Titanium, rod, diam. 6.35 mm, 99.99% trace metals basis

P11409

Sigma-Aldrich

Phenanthrene, 98%

348864

Sigma-Aldrich

Titanium, wire, diam. 0.5 mm, 99.99% trace metals basis

460397

Sigma-Aldrich

Titanium, foil, thickness 0.127 mm, ≥99.99% trace metals basis

513415

Sigma-Aldrich

Titanium, nanoparticles, dispersion, <100 nm particle size, in mineral oil, 98.5% trace metals basis

348856

Sigma-Aldrich

Titanium, wire, diam. 2.0 mm, 99.99% trace metals basis

348805

Sigma-Aldrich

Titanium, foil, thickness 0.5 mm, 99.99% trace metals basis

348813

Sigma-Aldrich

Titanium, foil, thickness 0.1 mm, 99.99% trace metals basis

73338

Supelco

Phenanthrene, certified reference material, TraceCERT^®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland

433667

Sigma-Aldrich

Titanium, evaporation slug, diam. × L 6.3 mm × 6.3 mm, ≥99.99% trace metals basis

749044

Sigma-Aldrich

Titanium, sputtering target, diam. × thickness 3.00 in. × 0.125 in., 99.995% trace metals basis

767506

Sigma-Aldrich

Titanium, sputtering target, diam. × thickness 2.00 in. × 0.25 in., 99.995% trace metals basis

695114

Sigma-Aldrich

Phenanthrene, sublimed grade, ≥99.5%

268496

Sigma-Aldrich

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

266019

Sigma-Aldrich

Titanium, wire, diam. 0.127 mm, 99.99% trace metals basis

366994

Sigma-Aldrich

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