Browsing by Author "Liu, Ching-Fang"

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A dual TiO2/Ti-stainless steel anode for the degradation of orange G in a coupling photoelectrochemical and photo-electro-Fenton system
(2019-04-01)
Liu, Ching-Fang
;
Huangb, C. P.
;
Hu, Chi-Chang
;
Huang, Chihpin
;
環境工程研究所
A dual-anode consists of stainless steel and TiO2/Ti electrodes is used to study the kinetics of the degradation of hazardous chemicals exemplified by azo dye orange G (OG) using a coupling photoelectrochemical catalytic and photoelectro-Fenton (PEC/PEF) system. Concurrent generation of hydroxyl radicals on the TiO2/Ti photocatalyst and in-situ generation of Fenton reagents on the stainless steel electrode greatly enhances the performance of the PEC/PEF electrodes over that of the PEC and the PEF alone process. The efficiency of the PEC/PEF process is a function of Fe2+ and H2O2 concentration OH center dot in the solution bulk, which promotes the oxidative degradation of OG and its byproducts. The mean carbon oxidation state (COS) is estimated to reflect the degree of mineralization. Based on the pseudo first-order kinetics with respect to OH center dot, OG, Fe2+, the corresponding reaction rates is established. UV-Vis spectrometry reveals the presence of four major intermediates, which helps establish the OG degradation pathways. (c) 2018 Elsevier B.V. All rights reserved.
Graphite Supported Stainless-Steel Electrode for the Degradation of Azo Dye Orange G by Fenton Reactions: Effect of Photo-Irradiation
(2019-01-01)
Liu, Ching-Fang
;
Huang, C. P.
;
Juang, Yaju
;
Hu, Chi-Chang
;
Huang, Chihpin
An electrode, stainless steel supported on graphite, was used for the degradation of hazardous organic compounds, azo dye Orange G (OG), using the photoelectro- Fenton (PEF) process. Results showed that the applied current controlled the electrogeneration rate of both ferrous ion and hydrogen peroxide, which in turn affected the dye degradation kinetics. At an applied current density of 45Acm-2, the SS-graphite electrode yielded a molar [H2O2]/[Fe2+] ratio of 3.6, which was optimal for dye degradation. Under otherwise identical conditions, UV irradiation significantly enhanced OG degradation, i.e.,PEF is more effective than electro-Fenton (EF) process. At the optimal applied current density of 45Acm-2, or optimal molar [H2O2]/[Fe2+] of 3.6, OG decolorization and total organic carbon removal were 83% (in 3h) and 55% (in 7h), versus 75% (in 3h) and 20% (in 7h) by PEF and EF, respectively. OG degradation by both PEF and EF processes followed the pseudo first-order kinetics, which suggested the major role of OH radical in OG decolorization.
Photoelectrochemical degradation of dye wastewater on TiO2-coated titanium electrode prepared by electrophoretic deposition
(2016-06-13)
Liu, Ching-Fang
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Huang, C. P.
;
Hu, Chi-Chang
;
Juang, Yaju
;
Huang, Chihpin
The degradation of azo dye Orange G (OG) on TiO2/Ti electrode was studied using a photoelectrocatalytic system. TiO2/Ti electrode was prepared by electrophoretic deposition (EPD) process. Results of surface analyses, namely, X-ray diffraction (XRD), SEM, X-ray photoelectron spectroscopy (XPS), and linear sweep voltammetry (LSV), revealed that the optimal EPD condition was a deposition potential of 180 V for 1 min and annealed at 350 degrees C. The TiO2/Ti electrode was used as photoanode and a graphite cathode for the degradation of OG. The coupling effect of photocatalytic and electrochemical oxidation processes was evaluated in terms of the decolorization of OG. The degradation of OG increased in the following increasing order: photocatalysis < electrochemical oxidation < photoelectrochemical degradation. A decolorization of 54.3% was achieved at an applied current density of 75 A cm(-2). The degradation of Orange G follows the first-order kinetics in those three treatment processes, which suggests the participation of OH radicals in the decolorization reaction. (C) 2016 Elsevier B.V. All rights reserved.
Preparation of TiO2 nanotube arrays/Ti electrode by anodic oxidation method for the degradation of dye in aqueous solutions
(2014-08-10)
Liu, Yi-Jin
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Liu, Ching-Fang
;
Huang, Chihpin
;
Hu, Chi-Chang
;
環境工程研究所
Preparation of TiO2/stainless steel electrode for degradation of dye solution using photoelectrochemical oxidation process
(2013-09-08)
Yang, Sin-Ru
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Liu, Ching-Fang
;
Huang, Chihpin
;
Pan, Jill Rushing
;
環境工程研究所