Estimation of phase ratio for nano-sized TiO2 powders by Ti K-edge XANES

Lee, Youn‐Seoung; Lim, Hyung Mi; Kim, Sun–Jae; Lee, Wonjun; Cho, Duk-Ho

doi:10.1163/156856703322601799

Cited by 9 publications

(6 citation statements)

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“…4a). The three peaks are due to the Ti 4p-Ti 3d hybridization and Ti 4p-O 2p hybridization in TiO 2 , suggesting the presence of TiO 2 in the samples (Lee et al 2003). Therefore, XANES further con rmed the presence of TNP in the water and sediment of east Taihu Lake.…”

Section: Resultsmentioning

confidence: 71%

“…X-ray absorption near edge spectroscopy (XANES) is a powerful tool to investigate the local coordination environment of most of the metals in the environment, which could distinguish the various compounds, even those possessing the same metallic element (Eley et al 1986;Gaillard et al 2001;Manceau et al 2002). Based on the linear tting of the characterized pre-edge peaks of Ti K-edge XANES spectra, Lee Y. et al calculated the phase ratio of anatase to rutile for TNP mixtures (Lee et al 2003). For environmental samples (wastewater and sediment), Tong T. Z. et al reported credible Ti tting results using standard substances containing anatase, rutile, brookite, amorphous TiO 2 and ilmenite (Tong et al 2015b).…”

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confidence: 99%

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Occurrence of titanium dioxide nanoparticle in Taihu Lake (China) and its removal at a full-scale drinking water treatment plant

Liu

Min

2021

Environ Sci Pollut Res

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The occurrence of titanium dioxide nanoparticle (TNP), an emerging contaminant, in Taihu Lake of China was investigated. Ti was present at a concentration of 224 ± 59 µg/L in the water source of east Taihu Lake. Approximately 0.19% of the Ti-containing matter was at the nano-scale. Scanning Electron Microscope analysis veri ed the existence of Ti-containing components, such as TiO X and FeTiO X .Furthermore, Ti K-edge X-ray absorption near-edge structure spectroscopy was used to detect the phase composition of nano-scaled Ti-containing matter. The spectra showed the three characteristic peaks of TiO 2 in the samples, suggesting the occurrence of TNP in Taihu Lake. A least-squares linear combination tting analysis indicated that the TNP concentration in the water source was 0.86 µg/L, with a crystal composition of 0.44 ± 0.1 µg/L amorphous, 0.14 ± 0.03 µg/L anatase and 0.28 ± 0.06 µg/L rutile. The removal performance of the TNP at a full-scale conventional drinking water treatment plant indicated that 58.8% of TNP was removed via coagulation/sediment, sand ltration and disinfection/clear water reservoir. The coagulation/sediment process accounted for approximately 76.6% of the total removed TNP. The nished water contained 0.33 µg/L TNP with a crystal composition of 0.24 ± 0.13 µg/L anatase and 0.09 ± 0.05 µg/L rutile. This study is the rst that reported the presence and transport of TNP in a drinking water treatment system.

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Section: Resultsmentioning

confidence: 71%

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confidence: 99%

Occurrence of titanium dioxide nanoparticle in Taihu Lake (China) and its removal at a full-scale drinking water treatment plant

Liu

Min

2021

Environ Sci Pollut Res

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Section: Introductionmentioning

confidence: 99%

Occurrence of titanium dioxide nanoparticle in Taihu Lake (China) and its removal at a full-scale drinking water treatment plant

Liu¹,

Min²,

2021

Preprint

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The occurrence of titanium dioxide nanoparticle (TNP), an emerging contaminant, in Taihu Lake of China was investigated. Ti was present at a concentration of 224 ± 59 µg/L in the water source of east Taihu Lake. Approximately 0.19% of the Ti-containing matter was at the nano-scale. Scanning Electron Microscope analysis verified the existence of Ti-containing components, such as TiOX and FeTiOX. Furthermore, Ti K-edge X-ray absorption near-edge structure spectroscopy was used to detect the phase composition of nano-scaled Ti-containing matter. The spectra showed the three characteristic peaks of TiO2 in the samples, suggesting the occurrence of TNP in Taihu Lake. A least-squares linear combination fitting analysis indicated that the TNP concentration in the water source was 0.86 µg/L, with a crystal composition of 0.44 ± 0.1 µg/L amorphous, 0.14 ± 0.03 µg/L anatase and 0.28 ± 0.06 µg/L rutile. The removal performance of the TNP at a full-scale conventional drinking water treatment plant indicated that 58.8% of TNP was removed via coagulation/sediment, sand filtration and disinfection/clear water reservoir. The coagulation/sediment process accounted for approximately 76.6% of the total removed TNP. The finished water contained 0.33 µg/L TNP with a crystal composition of 0.24 ± 0.13 µg/L anatase and 0.09 ± 0.05 µg/L rutile. This study is the first that reported the presence and transport of TNP in a drinking water treatment system.

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“…The acid-induced dissolution behaviour of ilmenite typically correlates to local structure at particle surface such as surface terminal texture of crystal structure, structural disorder, lattice stress and strain induced by mechanical milling activation. The change in local structure of titanate during ball-milling process is important especially in part of amorphous phase that could be evaluated by x-ray absorption near edge spectroscopy (XANES) study [24,25]. However, based on our recent knowledge, the local structure evolution on ball-milled ilmenite ore has been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Characterization and x-ray absorption spectroscopy of ilmenite nanoparticles derived from natural ilmenite ore via acid-assisted mechanical ball-milling process

Phoohinkong

Pavasupree

Wannagon

et al. 2017

Adv. Nat. Sci: Nanosci. Nanotechnol.

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In this work activated ilmenite nanoparticles were prepared by chemical-assisted in mechanical ball-milling process from ilmenite ore as starting raw material. The effect of milling process on their phase composition, particle size, surface morphology and local structure were investigated. Phase identification and crystalline structure of ilmenite mineral, milled samples and subsequent leached residues were characterized by x-ray diffraction (XRD). Meanwhile, the distorted octahedral structure and the oxidation state of relevant elements in ilmenite ore and activated ilmenite obtained by different process conditions were analyzed by x-ray absorption spectroscopy (XAS). Particle size and morphologies of the samples were monitored by field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). Three dominant peaks of TiO2 rutile, FeTiO3, and Fe2TiO4 are obviously adulterated in XRD patterns after mechanical milling with water and acid solution when comparing to precursor mineral. However, the contaminated phase of FeTiO3 and Fe2TiO4 was readily decreased by acid-assisted mechanical ball-milling. The enhancement in leaching process of ilmenite residue after milling can be obtained with sulfuric acid. This result suggests that iron contaminated phase could be leached from the sample resulting to the decrease in Fe environment around Ti atom.

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Estimation of phase ratio for nano-sized TiO2 powders by Ti K-edge XANES

Cited by 9 publications

References 8 publications

Occurrence of titanium dioxide nanoparticle in Taihu Lake (China) and its removal at a full-scale drinking water treatment plant

Occurrence of titanium dioxide nanoparticle in Taihu Lake (China) and its removal at a full-scale drinking water treatment plant

Occurrence of titanium dioxide nanoparticle in Taihu Lake (China) and its removal at a full-scale drinking water treatment plant

Characterization and x-ray absorption spectroscopy of ilmenite nanoparticles derived from natural ilmenite ore via acid-assisted mechanical ball-milling process

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