The Incorporation of Carbon Element into Nanoporous Anodic Alumina by Pulse Anodization

The incorporation of carbon element into nanoporous anodic aluminum oxides from oxalic acid electrolyte was studied. The carbon element content in nanoporous anodic alumina by pulse anodization reaches up to ∼20 at.%, while it remains ∼7 at.% under constant anodization. It was proposed that the ionic dynamics in nanopores governs the carbon-containing anions incorporation into nanoporous anodic oxides. For the same 20 V resting voltage, the content of carbon element remains unchanged in a broad range of working voltages: 40–150 V. X-ray photoelectron analysis further revealed that the sp2/sp3 and C–O/C═O ratios increased significantly as the working voltage increased. The color exhibited by the nanoporous anodic alumina was related to the chemical states of the carbon present in the alumina, and not the carbon content.

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Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

Journal of Visualized Experiments ◽

10.3791/56432 ◽

2017 ◽

Author(s):

Healin Im ◽

Seok Hwan Jeong ◽

Dong Hyuk Park ◽

Sunkook Kim ◽

Young Ki Hong

Keyword(s):

Oxalic Acid ◽

Acid Electrolyte ◽

Aluminum Oxides ◽

Anodic Aluminum

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Nano-PAA-CuCl2 Composite as Fenton-Like Reusable Catalyst to Enhanced Degrade Organic Pollutant MB/MO

Catalysts ◽

10.3390/catal11010010 ◽

2020 ◽

Vol 11 (1) ◽

pp. 10

Author(s):

Yang Dang ◽

Yu Cheng ◽

Yukun Zhou ◽

Yifei Huang ◽

Kaige Wang

Keyword(s):

Photoelectron Spectroscopy ◽

Self Assembly ◽

Organic Pollutant ◽

Energy Dispersive Spectrometer ◽

Chemical Properties ◽

Anodic Alumina ◽

Alumina Substrate ◽

Reusable Catalyst ◽

X Ray ◽

Nanoporous Anodic Alumina

The treatment of organic dye contaminants in wastewaters has now becoming more imperative. Fenton-like degradation of methylene blue (MB) and methyl orange (MO) in aqueous solution was investigated by using a nanostructure that a layer of CuCl2 nanoflake film grown on the top surface of nanoporus anodic alumina substrate (nano-PAA-CuCl2) as catalyst. The new nano-PAA-CuCl2 composite was fabricated with self-assembly approach, that is, a network porous structure film composed of CuCl2 nanoflake grown on the upper surface of nanoporous anodic alumina substrate, and the physical and chemical properties are characterized systematically with the X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and high-resolution transmission electron microscopy (HRTEM), Energy Dispersive Spectrometer (EDS), X-ray photoelectron spectroscopy (XPS). The experimental results showed that the nano-PAA-CuCl2 catalyst presented excellent properties for the degradation of two typical organic pollutants such as MB and MO, which were almost completely degraded with 8 × 10−4mol/L nano-PAA-CuCl2 catalyst after 46 min and 60 min at reaction conditions of H2O2 18 mM and 23 mM, respectively. The effects of different reaction parameters such as initial pH, H2O2 concentration, catalyst morphology and temperature were attentively studied. And more, the stability and reusability of nano-PAA-CuCl2 were examined. Finally, the mechanism of MB and MO degradation by the nano-PAA-CuCl2/H2O2 system was proposed, based on the experimental data of the BCA and the temperature-programmed reduction (H2-TPR) and theoretical analysis, the reaction kinetics belonged to the pseudo-first-order equation. This new nanoporous composite material and preparation technology, as well as its application in Fenton-like reaction, provide an effective alternative method with practical application significance for wastewater treatment.

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Annealing induced structural and phase transitions in anodic aluminum oxide prepared in oxalic acid electrolyte

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2019.125159 ◽

2020 ◽

Vol 381 ◽

pp. 125159 ◽

Cited By ~ 3

Author(s):

I.V. Roslyakov ◽

I.V. Kolesnik ◽

E.E. Levin ◽

N.S. Katorova ◽

P.P. Pestrikov ◽

...

Keyword(s):

Phase Transitions ◽

Oxalic Acid ◽

Aluminum Oxide ◽

Anodic Aluminum Oxide ◽

Acid Electrolyte ◽

Anodic Aluminum

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Tiltable magnetic anisotropy in oblique-deposited Fe arrays using nanoporous anodic aluminum oxides

Journal of Applied Physics ◽

10.1063/1.3486478 ◽

2010 ◽

Vol 108 (8) ◽

pp. 084318 ◽

Cited By ~ 5

Author(s):

Kai-Tze Huang ◽

Po-Cheng Kuo ◽

Ger-Pin Lin ◽

Chih-Lung Shen ◽

Yeong-Der Yao

Keyword(s):

Magnetic Anisotropy ◽

Aluminum Oxides ◽

Anodic Aluminum ◽

Nanoporous Anodic Aluminum

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Self-assembled Fe/Pt bilayered arrays on nanoporous anodic aluminum oxides

Solid State Communications ◽

10.1016/j.ssc.2009.09.004 ◽

2009 ◽

Vol 149 (47-48) ◽

pp. 2235-2239 ◽

Cited By ~ 1

Author(s):

K.T. Huang ◽

P.C. Kuo ◽

G.P. Lin ◽

Y.D. Yao

Keyword(s):

Aluminum Oxides ◽

Anodic Aluminum ◽

Self Assembled ◽

Nanoporous Anodic Aluminum

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Titania nanotubes prepared by anodization in fluorine-free acids

Journal of Materials Research ◽

10.1557/jmr.2007.0203 ◽

2007 ◽

Vol 22 (6) ◽

pp. 1624-1631 ◽

Cited By ~ 33

Author(s):

C. Richter ◽

E. Panaitescu ◽

R. Willey ◽

L. Menon

Keyword(s):

Sulfuric Acid ◽

Aspect Ratio ◽

Oxalic Acid ◽

Organic Acid ◽

Carbon Content ◽

High Aspect Ratio ◽

Titania Nanotubes ◽

Acid Electrolyte ◽

Chlorine Ions

Recently, we reported the discovery of new high-aspect ratio titania nanotubes. These nanotubes were synthesized by means of anodization in an oxalic acid electrolyte containing chlorine ions and were found to have significant carbon content. In this article, the synthesis of similar titania nanotubes in oxalic, formic, trichloroacetic, gluconic, hydrochloric, and sulfuric acid is reported. Differences in carbon content and morphology are analyzed, which in turn provides information on the chemistry of the formation of these nanotubes. Our results suggest that the carbon content in the nanotubes can be controlled by the use of an appropriate organic acid.

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Synthesis of Porous Anodic Alumina (PAA) on Aluminum Alloy AA6061 in Mixture of Phosphoric Acid and Oxalic Acid

Materials Science Forum ◽

10.4028/www.scientific.net/msf.857.237 ◽

2016 ◽

Vol 857 ◽

pp. 237-241

Author(s):

Chun Hong Voon ◽

Bee Ying Lim ◽

K.L. Foo ◽

Uda Hashim ◽

Sung Ting Sam ◽

...

Keyword(s):

Aluminum Alloy ◽

Oxalic Acid ◽

Phosphoric Acid ◽

Anodic Alumina ◽

Porous Anodic Alumina ◽

X Ray Diffraction ◽

X Ray ◽

Interpore Distance ◽

Diffraction Patterns ◽

Ordered Porous

In this study, porous anodic alumina was formed on aluminum alloy AA6061 by anodizing using mixture of 0.3 M oxalic acid and phosphoric acid with concentration ranged from 0.1 M to 1.0 M. AA6061 alloys were anodized at 40 V and 25°C for 60 minutes. FESEM images show that the uniformity of the pores arrangement of porous anodic alumina decreased with the increasing concentration of phosphoric acid in the electrolyte. Well-ordered porous anodic alumina was formed in mixture of 0.3 M oxalic acid and 0.1 M phosphoric acid while disordered porous anodic alumina were formed when the concentration of phosphoric acid were in the range of 0.3 M to 1.0 M. Pore size and interpore distance were found to increase with the concentration of phosphoric acid in the mixture. X-ray diffraction patterns show that to γ-Al2O3 were formed on the surface of AA6061 after the anodizing process, regardless of the concentration of phosphoric acid in the mixture electrolyte.

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