Photocatalytic activity and its stacking order dependence of transparent 12 tungsto(VI) phosphoric acid-brookite hybrid films

In this work, zinc phosphates were prepared from zinc nitrate and phosphoric acid at various Zn/P ratios as a novel white pigment for use in cosmetics. The chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness of the zinc phosphates were studied. Samples prepared at Zn/P = 2/1, 3/2, and 1/1 indicated XRD pattern of Zn3(PO4)2•4H2O. The plane particles were observed in SEM images of sample prepared at Zn/P = 2/1, 3/2 and 1/1. The photocatalytic activity of these zinc phosphate particles was too less to protect the sebum on the skin. The materials prepared at Zn/P = 2/1, 3/2 and 1/1 and their thermal products at 100 °C showed a high reflectance within the range of visible light. Samples prepared at high Zn/P ratio indicated small MIU value.

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Stacking order dependence of inverse spin Hall effect and anomalous Hall effect in spin pumping experiments

Journal of Applied Physics ◽

10.1063/1.4906176 ◽

2015 ◽

Vol 117 (17) ◽

pp. 17D901 ◽

Cited By ~ 9

Author(s):

Sang-Il Kim ◽

Dong-Jun Kim ◽

Min-Su Seo ◽

Byong-Guk Park ◽

Seung-Young Park

Keyword(s):

Hall Effect ◽

Anomalous Hall Effect ◽

Spin Hall Effect ◽

Spin Pumping ◽

Order Dependence ◽

Stacking Order ◽

Inverse Spin Hall Effect

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Visible-Light Sensitive Photocatalytic Activity of FeOx- and P-Modified TiO2 with Rutile Structure

Advanced Engineering Forum ◽

10.4028/www.scientific.net/aef.38.23 ◽

2020 ◽

Vol 38 ◽

pp. 23-27

Author(s):

Tomomi Hirai ◽

Yosuke Hayashi ◽

Shinji Iwamoto

Keyword(s):

Photocatalytic Activity ◽

Phosphoric Acid ◽

Visible Light ◽

Iron Phosphate ◽

High Photocatalytic Activity ◽

Recombination Reaction ◽

Rutile Structure ◽

Photogenerated Electrons ◽

Photocatalytic Activities ◽

Phosphate Species

Nanocrystalline rutile TiO2 particles were prepared via hydrothermal treatment of Ti-containing precursors obtained by low-temperature aging for a transparent diluted HCl solution of amorphous TiO2. The products were modified with FeOx and phosphoric acid, and the photocatalytic activities of the obtained catalysts under visible-light irradiation were examined. By the addition of FeOx or phosphoric acid, the photocatalytic activity of the rutile TiO2 was slightly increased. On the contrary, by the FeOx loading and subsequent addition of phosphoric acid, significant increases in the photocatalytic activity were attained. Results of UV-vis suggest that the iron oxides formed on the surface of rutile TiO2 were changed into highly dispersed iron phosphate species by the addition of phosphoric acid. It was presumed that these species effectively suppress the recombination reaction between the photogenerated electrons and holes and contribute to the high photocatalytic activity of the rutile TiO2 photocatalysts modified with FeOx and phosphoric acid.

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Influence of pH-control in phosphoric acid treatment of zinc oxide

Cerâmica ◽

10.1590/0366-69132017633662149 ◽

2017 ◽

Vol 63 (366) ◽

pp. 197-202

Author(s):

H. Onoda ◽

M. Chemel

Keyword(s):

Zinc Oxide ◽

Photocatalytic Activity ◽

Phosphoric Acid ◽

Inductively Coupled Plasma ◽

Acid Treatment ◽

Atomic Emission ◽

Ph Control ◽

X Ray Diffraction ◽

White Pigment ◽

Inductively Coupled

Abstract Zinc oxide is often used as a white pigment for cosmetics; however, it shows photocatalytic activity that causes decomposition of sebum on the skin when exposed to the ultraviolet radiation in sunlight. In this work, zinc oxide was reacted with phosphoric acid at various pH values to synthesize a novel white pigment for cosmetics. The chemical composition, powder properties, photocatalytic activities, colors, and smoothness of these pigments were studied. The obtained materials exhibited X-ray diffraction peaks relating to zinc oxide and phosphate after phosphoric acid treatment. The ratio of zinc phosphate to zinc oxide was estimated from inductively coupled plasma - atomic emission spectroscopy results. Samples treated at pH 4-7 yielded small particles with sub-micrometer sizes. The photocatalytic activity of zinc oxide became lower after phosphoric acid treatment. Samples treated at pH 4-7 showed the same reflectance as zinc oxide in both the ultraviolet and visible ranges. Adjustment of the pH was found to be important in the phosphoric acid treatment of zinc oxide.

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Photocatalytic activity and photoinduced hydrophilicity of brookite–heteropolyacid hybrid films

Applied Catalysis A General ◽

10.1016/j.apcata.2012.08.030 ◽

2012 ◽

Vol 445-446 ◽

pp. 274-279 ◽

Cited By ~ 4

Author(s):

Kunchaya Pruethiarenun ◽

Toshihiro Isobe ◽

Sachiko Matsushita ◽

Akira Nakajima

Keyword(s):

Photocatalytic Activity ◽

Hybrid Films ◽

Photoinduced Hydrophilicity

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Photocatalytic Activity of TiO2 Loaded on HZSM-5 Zeolite Treated with Phosphoric Acid

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.48-49.830 ◽

2011 ◽

Vol 48-49 ◽

pp. 830-833

Author(s):

Chun Ling Liu ◽

Yang Yu ◽

Wen Jie Zhang

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Phosphoric Acid ◽

Uv Irradiation ◽

Adsorption Equilibrium ◽

Sol Gel ◽

Adsorption Ability ◽

Gel Method ◽

Loading Amount ◽

Total Adsorption

HZSM-5 zeolite was prepared by treating of NaZSM-5 with phosphoric acid and used as support for TiO2 prepared by sol-gel method. Adsorption and photocatalytic activity of the zeolite, adsorption ability of the loaded TiO2, and the optimum TiO2 loading amount were studied. The maximum methyl orange adsorption rate was less than 1% in the range of HZSM-5 dosage from 0.01 g up to 0.07 g. After 30 min of irradiation, the photocatalytic activity of HZSM-5 under UV irradiation was only between 1.5% and 2.7%. Methyl orange reached its adsorption equilibrium after 20 min under stirring. Total adsorption on the supported material was less than 2% after adsorption equilibrium. The TiO2 loaded on HZSM-5 treated with 0.2 mol/l phosphoric acid presented the optimum activity. The TiO2/HZSM-5 photocatalyst loaded on HZSM-5 treated with 0.2 mol/l aqueous H3PO4 solution could remove 93% of the initial methyl orange after 2 h.

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