Photocatalytic degradation of methyl orange using polythiophene/titanium dioxide composites

Zhu, Yunfeng; Xu, Shoubin; Dan, Yi

doi:10.1016/j.reactfunctpolym.2010.01.007

Cited by 72 publications

(29 citation statements)

References 33 publications

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“…In the case of dyes, there may be some problems to distinguish the adsorption of dyes on the photocatalyst surface from the photocatalytic decomposition of the dyes. There is no problems if the adsorption of the dye on the surface of TiO 2 is negligible [9,10]. For example, Zhu et al [10] remarked that the high adsorption capacity of photocatalyst PT/TiO 2 (a composite prepared by the in situ chemical oxidative polymerization of thiophene) could possibly increase the photocatalytic degradation rate of methyl orange.…”

Section: Introductionmentioning

confidence: 99%

“…There is no problems if the adsorption of the dye on the surface of TiO 2 is negligible [9,10]. For example, Zhu et al [10] remarked that the high adsorption capacity of photocatalyst PT/TiO 2 (a composite prepared by the in situ chemical oxidative polymerization of thiophene) could possibly increase the photocatalytic degradation rate of methyl orange. Nonetheless, there was no information about the photocatalyst surface after the degradation process, because it is very important to observe the color of titania material surface to be sure that all the dye was decomposed.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the photocatalytic activity of TiO2 with high adsorption capacity

Janus

Kusiak-Nejman

Morawski

2011

Reac Kinet Mech Cat

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Photocatalysis is often used for the decomposition of organic compounds in water, e.g., for dye decomposition. There are many problems with calculating the photocatalytic activity of photocatalysts during dye decomposition, especially in the case of photocatalysts with a high adsorption capacity because it is difficult to say whether a dye is photocatalytically decomposed or whether it is only adsorbed on photocatalyst surface. In both cases, the dye disappears from the water, but the optimal situation is when the dye is both adsorbed and decomposed on photocatalyst surface. Moreover, it is problematic to compare the photocatalytic activity of different photocatalysts when they have strong adsorption capacity. In this study a new method of measuring photocatalytic activity of photocatalysts with high adsorption capacity is presented. Reactive Red (monoazo) and Direct Green (poliazo) dyes were used to determine adsorption capacity and photocatalytic activity of commercial TiO 2 Degussa P25, anatase TiO 2 and carbon modified anatase TiO 2 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of the photocatalytic activity of TiO2 with high adsorption capacity

Janus

Kusiak-Nejman

Morawski

2011

Reac Kinet Mech Cat

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“…Resulting TiO 2 slurry and an aqueous solution of HNO 3 were refluxed at 95°C for 2 h, cooled to room temperature and neutralized with 28% of aqueous ammonia. Then, it was filtered, washed and calcined at 400°C [25,26].…”

Section: Synthesis Of Titania By Wet Chemical Methodsmentioning

confidence: 99%

Photodegradation of Methyl Orange in Aqueous Solution by the Visible Light Active Co:La:TiO2 Nanocomposite

Azad¹,

Gajanan²

2017

Chem Sci J

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In this study, the Co:La:TiO 2 nanocomposite was prepared by the wet chemical method. Synthesized TiO 2 and Co:La:TiO 2 were characterized by X-Ray Diffractometer, SEM, TEM, UV-vis, FT-IR, Band gap energy and BET. The TiO 2 and Co:La:TiO 2 were used as photocatalyst for the degradation of Methyl Blue. The XRD pattern confirmed the presence of anatase and rutile phase in the catalyst. The particle size was estimated by the Scherrer's and found 68 and 32 nm for TiO 2 and Co:La:TiO 2 respectively. The particle morphology of the photocatalysts was found in nanodiamension. The surface area of the photocatalysts was found 37.52 and 106.68 m 2 /g for TiO 2 and Co:La:TiO 2 respectively. The band gap energy of TiO 2 and Co:La:TiO 2 were 3.2 and 3.0 eV. The photodegradation of Methyl Orange has been found 18% and 88% at 5 pH for TiO 2 and Co:La:TiO 2 respectively. The photodegradation of Methyl Orange has been found 19% and 98.9% at 25 ppm concentration of dye. The photodegradation of Methyl Orange has been found 25% and 96% at 800 mg/L amount of photocatalyst and 180 min illumination of visible light. The photodegradation was following the first order kinetics.

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“…In addition, thiophene and its derivatives are considered as a kind of promising sensitizers due to its high absorption in Vis light region. Zhu et al [21] and Lu and Yang [22] reported that polythiophene/TiO 2 and poly(3-hexylthiophene)/TiO 2 microparticles were synthesized and provided an apparent additive effect on their adsorption capacities under both UV light and Vis light.However, small molecule organic compounds modified TiO 2 are seldom reported. On the other hand, (E)-1,2-bis-(2-thienyl) ethylene [23] was reported as a kind of high performance material in Vis light region with narrow energy…”

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confidence: 99%

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confidence: 99%

Preparation, characterization and photodegradation of methylene blue based on TiO2 microparticles modified with thiophene substituents

et al. 2012

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The new microparticles, 2-formylthiophene (FT)/TiO 2 and (E)-1,2-bis(5-formyl-2-thienyl) ethylene (EBFTE)/TiO 2 were synthesized with a silane coupling agent. The prepared TiO 2 composites were characterized using Ultraviolet-Vis absorption (UV-Vis), X-ray diffraction (XRD), scanning electron microscope (SEM) and thermogravimetric analyzer (TGA). Methylene blue was used as a model material to examine the photocatalytic activities of the prepared catalysts under both Ultraviolet-Vis (UV) and visible (Vis) light. The enhanced photocatalytic activities were observed in the presence of (FT)/TiO 2 and EBFTE/TiO 2 under Vis light. It suggests that FT or EBFTE plays a block or active role in the photodegradation mechanisms under UV and Vis light irradiation, respectively. Organic dyes are widely used in textile industry and the released industrial waste has caused serious damages to the water system [1][2][3][4][5]. In 1976, Carey et al. [6] first reported that TiO 2 was used as a photocatalyst in the degradation of biphenyl and chlorobiphenyls. Frank and Bard [7] studied the photocatalysis oxidation of cyanide ion with oxygen in the presence of TiO 2 powders as a heterogeneous photocatalyst. TiO 2 with the non-toxicity, chemically stability and low cost is a dramatic photocatalyst in degradation of colored water. However, TiO 2 can only make use of ultraviolet (UV) light that accounted for about 3%-5% of sunlight due to its rather broad band-gap (3.2 eV) [1]. Therefore, researches have been done to explore the mechanism of photocatalytic degradation with TiO 2 [8][9][10][11][12][13][14][15] and improvement of the degradation efficiency. Thus, some effective methods have been developed, such as dye-sensitization, ion doping and semiconductor coupling [16][17][18]. In particular, dye-sensitization is utilized to expand the spectral response region extending from UV light to visible (Vis) light. Sensitizers that showed a better energy match with the conduction band (CB) and the valence band (VB) of TiO 2 are introduced to improve the utilization efficiency of sunlight. The composites are desired to be active, Vis-responsive and highly stable [12]. For example, porphyrin/TiO 2 [19] and poly(acrylamide-co-(acrylic acid))/TiO 2 [20] were applied in photodegradation and showed high degradation efficiency. In addition, thiophene and its derivatives are considered as a kind of promising sensitizers due to its high absorption in Vis light region. Zhu et al. [21] and Lu and Yang [22] reported that polythiophene/TiO 2 and poly(3-hexylthiophene)/TiO 2 microparticles were synthesized and provided an apparent additive effect on their adsorption capacities under both UV light and Vis light.However, small molecule organic compounds modified TiO 2 are seldom reported. On the other hand, (E)-1,2-bis-(2-thienyl) ethylene [23] was reported as a kind of high performance material in Vis light region with narrow energy

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Photocatalytic degradation of methyl orange using polythiophene/titanium dioxide composites

Cited by 72 publications

References 33 publications

Determination of the photocatalytic activity of TiO2 with high adsorption capacity

Determination of the photocatalytic activity of TiO2 with high adsorption capacity

Photodegradation of Methyl Orange in Aqueous Solution by the Visible Light Active Co:La:TiO2 Nanocomposite

Preparation, characterization and photodegradation of methylene blue based on TiO2 microparticles modified with thiophene substituents

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