Wen-Churng Lin

Kun Shan University, 臺南市, Taiwan, Taiwan

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Publications (16)40.43 Total impact

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    Wen-Churng Lin, Yo-Jane Lin
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    ABSTRACT: Vanadium(IV)-doped titanium dioxide (TiO(2)) photocatalyst powders were prepared by the sol-gel method and characterized by Brunauer-Emmett-Teller-specific surface area, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet-visible spectroscopy. V-doping in the TiO(2) increases the crystal grain size, which decreases the specific surface areas of powders. This V-doping changes the band gap of TiO(2), leading to extend the absorption to visible light regions (400-800 nm). Photocatalytic degradation of methylene blue (MB) in water was investigated as a function of the vanadium content in TiO(2) and was found to follow pseudo first-order rate kinetics. Appropriate content of V-doping is an effective means to improve the photocatalytic activity of TiO(2) for MB degradation under visible light irradiation.
    Environmental Engineering Science 06/2012; 29(6):447-452. DOI:10.1089/ees.2010.0350 · 0.93 Impact Factor
  • Wen-Churng Lin, Wein-Duo Yang, Sen-Yuan Jheng
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    ABSTRACT: The degradation of the dyes methylene blue (MB), methyl orange (MO), and indigo (Ind) in water was carried out via a photocatalytic reaction. The porous nanocrystalline TiO2 photocatalysts used in the photocatalytic degradation were prepared using polyethylene glycol (PEG) as a structure-directing agent in the sol–gel system. The Taguchi experimental design method (L9(34)) was applied to determine the preparation conditions of the sol–gel process. The TiO2 photocatalyst powders obtained at the optimal preparation conditions through analysis of variance (ANOVA) could degrade methylene blue, methyl orange, and indigo in water by 57.06–84.14%, 35.15–50.09%, and 69.09–99.09%, respectively, after 10h of UV irradiation. TiO2 thin-film photocatalyst was also prepared at the optimal preparation conditions; it exhibited good performance for the photodegradation of methylene blue, methyl orange, and indigo solution under UV light irradiation.
    Journal of the Taiwan Institute of Chemical Engineers 03/2012; 43(2). DOI:10.1016/j.jtice.2011.10.010 · 2.64 Impact Factor
  • Wen-Churng Lin
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    ABSTRACT: Equilibrium tie-line data have been determined at 323.15 K, 348.15 K, and 373.15 K for the liquid–liquid equilibria (LLE) of the ternary systems undecane + 1,4-diethylbenzene + tetrahydrothiophene 1,1-dioxide and tridecane + 1,4-diethylbenzene + tetrahydrothiophene 1,1-dioxide. The relative mutual solubility of 1,4-diethylbenzene is higher in undecane + tetrahydrothiophene 1,1-dioxide than in tridecane + tetrahydrothiophene 1,1-dioxide mixture. The tie-line data were correlated with the universal quasichemical (UNIQUAC) and nonrandom two-liquid (NRTL) models. The calculated values based on the UNIQUAC model were found to be better than those based on the NRTL model; the average root-mean-square deviation between the phase composition obtained from the experiment and that from the calculation was 0.3788 for UNIQUAC compared to 0.4459 for NRTL. The values of selectivity and distribution coefficients were derived from the equilibrium data.
    Journal of Chemical & Engineering Data 07/2011; 56(12):4486–4490. DOI:10.1021/je200465z · 2.05 Impact Factor
  • Wen-Churng Lin
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    ABSTRACT: Equilibrium tie line data have been determined at (323.15, 348.15, and 373.15) K for the ternary liquid–liquid equilibria (LLE) of three alkane + sec-butylbenzene + sulfolane systems, where the alkanes studied are decane, dodecane, and tetradecane. The relative mutual solubility of sec-butylbenzene is higher in decane + sulfolane than in dodecane + sulfolane or tetradecane + sulfolane mixtures. The tie line data were correlated with the UNIQUAC and NRTL models. The calculated values based on the UNIQUAC model were found to be better than those based on the NRTL model; the average root-mean-square deviation between the phase composition obtained from experiment and that from calculation was 0.00385 for UNIQUAC compared to 0.00566 for NRTL. The values of selectivity and distribution coefficients were derived from the equilibrium data.
    Journal of Chemical & Engineering Data 06/2011; 56(7):3122–3127. DOI:10.1021/je200203k · 2.05 Impact Factor
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    ABSTRACT: The adsorption-induced polymerization of 3-methylthiophene (3MT) on silver vapor-deposited glass surfaces is investigated using micro Raman scattering and UV–Vis reflection spectroscopy. Both techniques provide the evidence of an adsorption-induced polymerization mechanism of these molecules, indicating that the orientation of 3MT molecules randomly distributes in the bulk poly(3-methylthiophene) film. The kinetics of 3MT adsorption-induced polymerization is also studied using Auger electron spectroscopy. The adsorption-induced polymerization process shows constant adsorption rate (0.15 nm min−1) within adsorption time of 1 h. Moreover, the electroactive characteristics of P3MT are employed to detect uric acid in phosphate buffer solution.Research highlights► In this study, the adsorption of 3MT molecules on Ag surface is induced polymerization. ► The Raman spectra have proved that the molecular structures of P3MT are bonded between units to obtain a random molecular architecture, in agreement with the mode of inter-ring stretching. ► The reversible redox of P3MT-modified electrode possesses the electrocatalytic activity for the biosensing applications.
    Materials Chemistry and Physics 05/2011; 127(1-2):185-190. DOI:10.1016/j.matchemphys.2011.01.057 · 2.13 Impact Factor
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    ABSTRACT: A biosensor electrode possessing highly sensitive and selective determination of dopamine (DA) is fabricated. This electrode, a silver (Ag) thin film on indium-tin-oxide glass, is treated with a silver sulfide (Ag2S) film using electrochemical deposition. Active Ag ion is easier to form on Ag2S than on pristine Ag, which prefers to attract ascorbic acid (AA). The Ag2S layer reduces the oxidation potential of AA due to the electrostatic interaction, which results in well-separation of mixed oxidation responses to both of DA and AA. Besides, the Ag2S-modified electrode exhibits dramatic electrocatalytic effect on the oxidation of DA in the presence of AA. In 0.1 M phosphate buffer solution at pH ∼ 7.0, the differential pulse voltammetric peak intensity linearly correlates with DA concentration in two regions, viz. 1.0–10, and 10–100 μM, with correlation coefficient of 0.998 and 0.995, respectively. The lowest concentration limit of 1.0 μM DA can be detected. The interference of AA effectively diminishes in the mixed solution. These features make the Ag2S significant for selective and sensitive measurement of DA in the presence of excess AA.
    Electrochimica Acta 02/2011; 56(5):1955–1959. DOI:10.1016/j.electacta.2010.11.091 · 4.09 Impact Factor
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    ABSTRACT: Organic dyes have been synthesized which containing multiple electron donors (carbazole) and electron acceptors (rhodaniline-3-acetic acid) on triphenylamine (TPA). Photophysical, electrochemical, and theoretical computational methods have categorized these compounds. Nanocrystalline TiO2-based dye-sensitized solar cells (DSSCs) are fabricated using these dye molecules as light-harvesting sensitizers. The overall efficiency of sensitized cells is high (4.64%) as compared to a cis-di(thiocyanato)-bis(2,2′-bipyridyl)-4,4′-dicarboxylate ruthenium(II) (N3 dye)-sensitized device (7.83%) fabricated and measured under the same conditions. Both electron donor (carbazole) and acceptor (rhodaniline-3-acetic acid) play a key role in the increased efficiency. One carbazole and two rhodaniline-3-acetic acid-based dye appears to help convey the charge transfer from the excited dye molecules to the conduction band of TiO2, leading to a higher efficiency of the assembled devices using such a dye. Electrochemical impedance measurements support this dye’s effect on enhancing charge transfer of TiO2 (e−). Computation on this CTPAR2 compound also indicates a larger charge transfer efficiency in the electronically excited state.
    The Journal of Physical Chemistry C 11/2010; 114(49). DOI:10.1021/jp106275v · 4.84 Impact Factor
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    ABSTRACT: Nitrogen-doped titanium oxide powders were synthesized by the two-microemulsion technique and used as a support for Pt toward photocatalytic hydrogen evolution. Two solutions of microemulsion with same water/oil (w/o) ratio were mixed together to form a slurry of titania precursor, one contains Ti4+ ions chelated with citric acid aqueous droplets and the other has aqueous ammonia droplets. After the consecutive procedures of evaporation, drying, calcination, and grinding, the nanosized TiO2−xNx or Pt/TiO2−xNx photocatalysts were obtained. The synthesized nanosized photocatalysts were then utilized to produce hydrogen by photocatalytic methanol/water splitting in visible light. The effects of Pt loading content, methanol/water ratio, and pH of the methanol/water solution on the performances of the photocatalysts for hydrogen evolution were investigated.
    Energy & Fuels 04/2009; 23(4):2192-2196. DOI:10.1021/ef801091p · 2.73 Impact Factor
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    ABSTRACT: We report the characterization of triphenylamine-based hole-transporting material, N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1, 1′-biphenyl-4,4′-diamine (TPD), used in the electrochromic devices. The electrochromic properties of different TPD thickness were studied by employing the electrochemical and spectroelectrochemical methods. Cyclic voltammograms of TPD films on an indium tin oxide (ITO)-coated glass exhibited one reversible redox couple in the range of 0–1.4 V versus Ag/AgCl in 0.1 N HClO4. To assemble the dual-type electrochromic devices using different thickness (250, 400, and 1000 nm) of TPD films: ITO/TPD//PU-LiClO4//PEDOT/ITO, the optical contrast of the devices increases with increasing the TPD film thickness, whereas the 1000 nm TPD film showed relatively excellent stability with respect to the electrochromic characteristics as compared to 250 and 400 nm films; the color of the film changed from orange-brown, transparent, and dark blue at −2.0, 0.0, and +2.0 V (vs. PEDOT), respectively, where PEDOT is poly(3,4-ethylenedioxythiophene)-poly(4-styrenesulfonate).
    Journal of electroanalytical chemistry 06/2008; 617(2-617):101-110. DOI:10.1016/j.jelechem.2008.01.015 · 2.87 Impact Factor
  • Chien-Hsin Yang, Wen-Churng Lin, Wei-Tung Liao
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    ABSTRACT: Copper recovery from ethylenediaminetetraacetic acid (EDTA)-chelating-Cu wastewater was conducted by means of electrochemical process using a Cu cathode and a PbO2 anode. In this study, the effects of operating parameters including current density, initial pH, and electrolytic-cell mode on the quality of copper deposit and current efficiency were studied. It was found that the key factors influencing deposit quality and current efficiency are current density and electrolytic cell mode as well as interactions between them. A better quality of copper deposit with high current efficiency can be obtained at lower current density (2.5 mA/cm2) in this fluidized packed-bed electrolytic cell.On a effectué la récupération de cuivre à partir d'eaux usées d'acide d'éthylènediamine-tétraacétique (EDTA)-Cu complexant par un procédé électrochimique utilisant une cathode de Cu et une anode de PbO2. On a étudié dans ce travail les effets des paramètres opératoires, dont la densité de courant, le pH initial et le mode de la cellule électrolytique, sur la qualité du dépôt de cuivre et le rendement du courant. On a trouvé que les facteurs clés influençant la qualité de déposition et le rendement du courant sont la densité de courant et le mode de la cellule électrolytique ainsi que les interactions mutuelles. Une meilleure qualité de dépôt de cuivre avec un haut rendement de courant peut être obtenu à une faible densité de courant (2,5 mA/cm2) dans cette cellule électrolytique à lit garni fluidisé.
    The Canadian Journal of Chemical Engineering 06/2008; 83(3):409 - 417. DOI:10.1002/cjce.5450830303 · 1.31 Impact Factor
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    ABSTRACT: Equilibrium tie line data have been determined at (298.15, 323.15, 348.15, and 373.15) K for the ternary liquid-liquid equilibria (LLE) of heptane + (toluene or m-xylene) + sulfolane systems. The relative mutual solubility of toluene is higher than that of m-xylene in heptane + sulfolane mixtures. The tie line data were correlated with the UNIQUAC and NRTL models. The calculated values based on the UNIQUAC model were found to be better than those based on the NRTL model; the average root-mean-square deviation between the phase composition obtained from experiment and that from calculation was 0.5111 for UNIQUAC compared to 0.6475 for NRTL. The values of selectivity and the distribution coefficient were derived from the equilibrium data at different temperatures.
    Journal of Chemical & Engineering Data 03/2008; 53(3):760-764. DOI:10.1021/je700611f · 2.05 Impact Factor
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    ABSTRACT: A self-assembly technique and copolymerization were used to buildup a self-doped polyaniline (SPANI) ultra-thin film on an indium-tin oxide (ITO) substrate. The monomers used were aniline and its derivative MSAN (m-aminobenzenesulfonic acid). Successful MSAN/AN copolymerization and film formation were simultaneously performed in aqueous solution with the addition of oxidant (APS, ammonium persulfate). The film deposition rate of a high AN/MSAN ratio system is generally higher than that of a low AN/MSAN ratio system. Cyclic voltammetry, UV–vis spectroscopy, and α-step instruments indicate a systematic dependence of the film thickness of these ultra-thin films on the assembly time and temperatures. The Auger depth profile reveals the elemental distribution in these films and exhibits different deposition rates between AN and MSAN. XPS N1s spectra also show the variation of the degree of doping. This SPANI film can be used as an electrochromic electrode in a corresponding device. Carboxyl-terminated-butadiene-acrylonitrile (CTBN) blended with LiClO4 was used as a solid polymer electrolyte. A total solid electrochromic device was assembled as ITO/SPANI/LiClO4–CTBN/PEDOT:PSS/ITO, where PEDOT:PSS is poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) as the counter complementary electrode. The device was pale gray at −1.5 V and blue at +1.5 V.
    Polymer 05/2007; 48(11):3237-3247. DOI:10.1016/j.polymer.2007.04.013 · 3.77 Impact Factor
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    ABSTRACT: Equilibrium tie line data have been determined at (323.15, 348.15, and 373.15) K for the ternary liquid−liquid equilibria (LLE) of three alkane + hexylbenzene + sulfolane systems, where the alkanes studied are decane, dodecane, and tetradecane. The relative mutual solubility of hexylbenzene is higher in decane + sulfolane than in dodecane + sulfolane or tetradecane + sulfolane mixtures. The tie line data were correlated with the UNIQUAC and NRTL models. The calculated values based on the UNIQUAC model were found to be better than those based on the NRTL model. The values of selectivity and distribution coefficients were calculated from the equilibrium data.
    Journal of Chemical & Engineering Data 03/2007; 52(3). DOI:10.1021/je7000123 · 2.05 Impact Factor
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    ABSTRACT: Pyrrole copolymer produced by coelectropolymerization of pyrrole (Py) and 2,2'-dithiodianiline (DTDA) in organic medium (propylene carbonate, PC) was investigated by cyclic voltammetry, UV-visible spectroelectrochemical study, infrared spectroscopy, and scanning electron spectroscopy (SEM). The cyclic voltammogram of the copolymer grown from nonaqueous media containing an electrolyte ( LiClO4) is significantly affected by DTDA concentration in the deposition solution. The electropolymerization rate of pyrrole is decreased upon addition of DTDA in the growth solution. This involves the possible branched structure for the copolymer. SEM was used to determine the morphological behavior of the copolymer. The results show that a branch as a consequence of incorporation of DTDA units resulting in -S-S- links in the polypyrrole structure. UV-visible spectrum of the copolymer showed three optical transitions at eta(max) = 390, 540, and 800 nm for different applied potentials. At 425 nm, a fixed stoichiometric ratio of oxidized to reduced form exists when the P(Py-DTDA) copolymer film is oxidized successively by applying potentials, but such a ratio did not exist in PPy film. (C) 2003 The Electrochemical Society.
    Journal of The Electrochemical Society 06/2003; 150(6). DOI:10.1149/1.1572153 · 2.86 Impact Factor
  • Wen-Churng Lin, Nien-Hsin Kao
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    ABSTRACT: Equilibrium tie line data have been determined at 323.15 K, 348.15 K, and 373.15 K for the ternary liquid−liquid equilibria (LLE) of octane + (benzene or toluene or m-xylene) + sulfolane systems. The relative mutual solubility of benzene is higher than that of toluene or m-xylene in octane + sulfolane mixtures. The tie line data were correlated with the NRTL and UNIQUAC models. The calculated values based on the NRTL model were found to be better than those based on the UNIQUAC model; the average root-mean-square deviation between the phase composition obtained from experiment and that from calculation was 0.49 for NRTL compared to 0.53 for UNIQUAC. The values of selectivity and the distribution coefficient were derived from the equilibrium data at different temperatures.
    Journal of Chemical & Engineering Data 05/2002; 47(4). DOI:10.1021/je020029d · 2.05 Impact Factor
  • Wen-Churng Lin, Chien-Hsin Yang, Teh-Hua Tsai
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    ABSTRACT: Equilibrium tie line data have been determined at 323.15 K, 335.65 K, 348.15 K, 360.65 K, and 373.15 K for the ternary liquid-liquid equilibria (LLE) of tridecane + (butylbenzene or 1,4-diisopropylbenzene) + sulfolane systems. The relative mutual solubility of butylbenzene is higher than that of 1,4diisopropylbenzene in tridecane + sulfolane mixtures. The tie line data were correlated with the well-known UNIQUAC and NRTL models. The calculated values based on the UNIQUAC model were found to be better than those based on the NRTL model, and showed that the higher accuracy of predictions existed at lower temperature. The values of selectivity and the distribution coefficient were derived from the equilibrium data at different temperatures.
    Journal of Chemical & Engineering Data 03/2002; 47(2):245-249. DOI:10.1021/je010267t · 2.05 Impact Factor