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Featured researches published by Chih-Ming Ma.


Journal of Hazardous Materials | 2010

Mineralization of reactive Black 5 in aqueous solution by ozone/H2O2 in the presence of a magnetic catalyst

Hua-Wei Chen; Yu-Lin Kuo; Chyow-San Chiou; Shih-Wei You; Chih-Ming Ma; Chang-Tang Chang

Particles are often too small to be separated from a reaction system and recycled, especially in wastewater treatment via a catalytic ozonation process. Thus, the objective of this study was to prepare a magnetic catalyst (SiO(2)/Fe(3)O(4)) that can be recycled by using an external magnetic field. The effects of the characteristics of the magnetic catalyst, pH values, catalyst dosage, and initial concentration of Reactive Black 5 (RB5) on mineralization efficiency of the magnetic catalyst/H(2)O(2)/O(3) process were also investigated. The mineralization efficiency of RB5 under various conditions followed the sequence: SiO(2)/Fe(3)O(4)/H(2)O(2)/O(3)>SiO(2)/Fe(3)O(4)/O(3)>Fe(3)O(4)/O(3) approximately H(2)O(2)/O(3)>O(3)>SiO(2)/Fe(3)O(4)/H(2)O(2). Given the results of our reuse and recovery experiments, the magnetic catalyst shows considerable promise for use in water treatment.


Journal of The Chinese Institute of Engineers | 2010

Effect of platinum on the photocatalytic decomposition of 2‐chlorophenol in aqueous solution by UV/TiO2

Young Ku; Yu‐Chun Li; Wen-Yu Wang; Chih-Ming Ma; Yiang-Chen Chou

Abstract Photocatalytic decomposition of 2‐chlorophenol in aqueous solutions with platinum‐coated TiO2 slurry under UV irradiation was examined, utilizing various solution pH levels, dissolved oxygen levels and UV light intensities. The atomic percentage of platinum deposited on the TiO2 surfaces were identified by X‐ray photoelectron spectroscopy (XPS) to be in the range of 0.12 and 0.99%. The decomposition of 2‐chlorophenol in acidic aqueous solutions by UV/TiO2 was enhanced to certain extents for experiments conducted with platinum‐coated TiO2 containing up to 0.82% platinum because of the formation of Schottky barrier between platinum and TiO2 to prevent the recombination of electric holes and electrons. However, for experiments conducted with TiO2 coated with higher platinum contents, the decomposition rate of 2‐chlorophenol was reduced markedly, possibly because of the depression of the light absorption of TiO2 by the shielding of coated platinum. The photocatalytic decomposition of 2‐chlorophenol in aqueous solution was inhibited for experiments conducted in neutral and alkaline solutions because the presence of platinum increases the repulsion between 2‐chlorophenol species and TiO2 to hinder the adsorption of 2‐chlorophenol species on TiO2. The decomposition rate of 2‐chlorophenol in aqueous solution by UV/TiO2 was found to be improved significantly with increasing UV light intensity.


Journal of The Chinese Institute of Engineers | 2007

Decomposition of 2-chlorophenol by sonolysis in aqueous solution saturated with various dissolved gases

Young Ku; Tai‐Chi Huang; Chih-Ming Ma

Abstract The effect of several operating factors on the decomposition of 2‐chlorophenol in aqueous solution by sonolysis was investigated in this study. Experiments conducted with the purge of Ar/O2 gas mixture of 2:1 molar ratio into aqueous solution yielded noticeably higher decomposition rate for 2‐chlorophenol (k 1 = 0.0060) possibly due to the increased solubility of the gas mixture. Sonochemical decomposition of 2‐chlorophenol was found to be more effective for experiments conducted in acidic and neutral solutions than in alkaline solutions (about 85% decomposition at solution pH 3). The sonication rate constant for the decomposition of 2‐chlorophenol was increased (0.0006 to 0.00516 at pH = 3; 0.00023 to 0.00284 at pH = 9) with sonication intensity applied between 8 and 50W cm–2. The addition of appropriate amounts of ferrous ions could increase the decomposition rate of 2‐chlorophenol by sonolysis, suggesting that Fe2+ ions may react with hydroxyl peroxide to prevent the recombination of hydroxyl free radicals.


Water Research | 2005

Effect of hydrogen peroxide on the decomposition of monochlorophenols by sonolysis in aqueous solution

Young Ku; Yu-Hsin Tu; Chih-Ming Ma


Chemical Engineering & Technology | 2007

Photocatalytic Oxidation of Isopropanol in Aqueous Solution Using Perovskite‐Structured La2Ti2O7

Young Ku; Ling-Chi Wang; Chih-Ming Ma


Water Air and Soil Pollution | 2009

Effects of Silver on the Photocatalytic Degradation of Gaseous Isopropanol

Chih-Ming Ma; Young Ku; Yu-Lin Kuo; Yiang-Chen Chou; Fu-Tien Jeng


Journal of Applied Electrochemistry | 2005

Modeling of the photocatalytic decomposition of gaseous benzene in a TiO2 coated optical fiber photoreactor

Wen Wang; Young Ku; Chih-Ming Ma; Fu-Tien Jeng


Water Air and Soil Pollution | 2011

Photocatalytic Oxidation of Reactive Red 22 in Aqueous Solution Using La2Ti2O7 Photocatalyst

Young Ku; Ling-Chi Wang; Chih-Ming Ma; Yiang-Chen Chou


International Journal of Chemical Kinetics | 2008

Photocatalytic decomposition of gaseous acetone using TiO2 and Pt/TiO2 catalysts

Young Ku; Kun-Yu Tseng; Chih-Ming Ma


Reaction Kinetics and Catalysis Letters | 2006

Photocatalytic oxidation of gaseous trichloroethylene by UV/TiO2 process

Chih-Ming Ma; Young Ku

Collaboration


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Young Ku

National Taiwan University of Science and Technology

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Yiang-Chen Chou

National Taiwan University of Science and Technology

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Ling-Chi Wang

National Taiwan University of Science and Technology

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Fu-Tien Jeng

National Taiwan University

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Yu-Lin Kuo

National Taiwan University of Science and Technology

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Hua-Wei Chen

National Taiwan University of Science and Technology

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Kun-Yu Tseng

National Taiwan University of Science and Technology

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Wen Wang

National Taiwan University of Science and Technology

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Wen-Yu Wang

Chaoyang University of Technology

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Yu-Hsin Tu

National Taiwan University of Science and Technology

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