Construction of N, S codoped TiO2 NCs decorated TiO2 nano-tube array photoelectrode and its enhanced visible light photocatalytic mechanism

Cheng, Xiuwen; Liu, Huiling; Chen, Qinghua; Li, Junjing; Wang, Pu

doi:10.1016/j.electacta.2013.04.072

Cited by 78 publications

(41 citation statements)

References 40 publications

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“…It should be noted that any peak typical for rutile was not observed. Furthermore, the lack of signal attributed to dopant atoms results from their low content in the material and cannot be detected by XRD [17]. Basing on the Scherrer equation, crystalline size was calculated and equals 17.3 nm for pure and 25.9 nm for iodine-doped titania.…”

Section: Resultsmentioning

confidence: 99%

“…Basing on the Scherrer equation, crystalline size was calculated and equals 17.3 nm for pure and 25.9 nm for iodine-doped titania. Increase in crystallite size is probably due to the incorporation of dopant atoms into the structure, e.g., substitution of the lattice oxygen and titanium atoms or introduction of iodine at the interstitial sites [17].…”

Section: Resultsmentioning

confidence: 99%

“…Under illumination, terephthalic acid easily reacts with •OH t o p r o d u c e a h i g h l y f l u o r e s c e n t p r o d u c t , 2 -hydroxyterephthalic acid [16]. The intensity of the PL peak of 2-hydroxyterephthalic acid is directly proportional to the amount of formed •OH radicals [17]. The initial concentration of TA was 50 mM in 2 mM NaOH.…”

Section: Photocurrent Measurementmentioning

confidence: 99%

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Optimization of electrochemical doping approach resulting in highly photoactive iodine-doped titania nanotubes

Szkoda

Siuzdak

Lisowska-Oleksiak

2015

J Solid State Electrochem

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The paper focuses on the optimization procedure concerning the synthesis method resulting in highly ordered titania nanotubes doped with iodine atoms. The doping process was based on the electrochemical treatment of a titania nanotube layer immersed in a potassium iodide (KI) solution acting as an iodine precursor. A number of endeavors were undertaken in order to optimize the doping conditions. Electrolyte concentration, reaction voltage, and time/duration were the main factors that influenced the iodine (I)-doping effect on the photoactivity. The parameters of electrochemical doping that result in a material characterized by the highest photocurrent density are as follows: reaction voltage of 1.5 V, duration of 15 min, and 0.1 M KI. Different spectroscopic techniques, i.e., UV-Vis spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the absorbance capability and the crystalline phase, to confirm the presence of iodine atoms and to study the nature of chemical compounds. The morphology inspection performed by means of scanning electron microscopy shows that the doping process does not affect the ordered tubular architecture. The photocurrent densities of the I-doped sample were six times higher in comparison to those generated by the pure titania nanotube electrode. Moreover, doped samples act as a much better catalyst in the photodegradation process of methylene blue and formation of hydroxyl radicals (•OH) than undoped samples.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Photocurrent Measurementmentioning

confidence: 99%

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Optimization of electrochemical doping approach resulting in highly photoactive iodine-doped titania nanotubes

Szkoda

Siuzdak

Lisowska-Oleksiak

2015

J Solid State Electrochem

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“…Furthermore if the nature of the target water contaminants is such that they adhere effectively to the photocatalyst surface the process would be more effective in removing such compounds from the solution. The photocatalytic degradation of aromatics is highly dependent on the substituent group [55]. The organic substrates with electron withdrawing nature (benzoic acid, nitrobenzene) strongly adhere to the photocatalyst and therefore are more susceptible to direct oxidation compared with the electron donating groups [56].…”

Section: Concentration and Nature Of Pollutantsmentioning

confidence: 99%

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Kumar

Gajanan

ey³

2017

MSEIJ

209

124

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The oxidation rates and efficiency of the photocatalytic system are highly dependent on a number of operational parameters that govern the photodegradation of the organic molecule. Several study have been reported the significance of operational parameter. The photodegradation depends on the some basic parameters which are concentration of substrate, amount of photocatalyst, pH of the solution, temperature of reaction medium, time of irradiation of light, the intensity of light, surface area of photocatalyst, dissolve oxygen in the reaction medium, nature of the photocatalyst, nature of the substrate, doping of metal ions and non metal and structure of photocatalyst and substrate. The photodegradation of organic compound have been studied by the several scientists and conclude the optimum conditions for the photodegradation of organic compound.The photodegradation of organic compounds was found maximum at low concentration of organic substrate with optimum amount of photocatalyst. The pH of the solution is also affect the photodegradation of organic substrate. The Titania show the maximum adsorption at low pH hence the photodegradation also found maximum at low pH. The surface area is the crucial factor for the photodegradation of organic substrate. If we are increasing the surface area of photocatalyst, the photodegradation of organic substrate increase. This is because that the number of active site increased with increasing the surface area. The amount of photocatalyst is the primary requirement of any photocatalysis process. The amount of photocatalyst should be optimum, if we take the high amount of photocatalyst the photodegradation is decreased, if we take the low amount of photocatalyst the photodegradation also decreased. The doping of metal ions and non-metal ions affect the photodegradation of organic substrate. Therefore, we have to use the metal ions which increased the positive charge on the surface of photocatalyst. The temperature and irradiation of light also affect the photodegradation of organic substrate. For the maximum photodegradation, the photocatalytic reaction should perform at room temperature not greater than 80 °C. The light of irradiation should be used which exit the electron easily from valence band to conduction band or equal to band gap energy. Keywords: A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials 2/10Copyright: ©2017 Kumar et al. for the removal of pollutants at high concentrations. The biological treatments are very slow, dispose large amount of sludge and required strict control of proper pH and temperature [21]. In this regard photo catalytic processes have advantages for the removal of pollutants even at low concentration for industrial waste water [22]. Moreover in photo oxidation, complete oxidation of organic pollutants take place within few hours, even at ppb level, without formation of secondary hazardous products using highly active and cheap catalysts which can be used in specially design reactor systems [23].Ti...

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“…The increase of crystallite size can be ascribed to the incorporation of dopant atoms into the structure, e.g., substitution of the lattice oxygen/titanium atoms or introduction of boron at the interstitial sites [36]. , which are attributed to Ti-O stretching and Ti-OTi bridging stretching modes [37]. The peak found around 1000 cm −1 could be assigned to the stretching vibration of…”

Section: Resultsmentioning

confidence: 99%

Optimization of boron-doping process of titania nanotubes via electrochemical method toward enhanced photoactivity

Szkoda

Lisowska-Oleksiak

Siuzdak

2016

J Solid State Electrochem

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In this work, we were focused on the development of the electrochemical approach resulting in a stable boron doping of titania nanotubes. The doping procedure concerns anodic polarization of as-anodized titania in a H 3 BO 3 solution acting as n boron precursor. The series of attempts were taken in order to elaborate the most beneficial doping conditions. The parameters of electrochemical doping allowing to obtain boron-doped titania characterized by the highest photoconversion efficiency are as follows: reaction voltage 1.8 V, process duration 0.5 h, and the concentration of boric acid 0.5 M. Spectroscopy techniques such as UV-vis, X-ray diffraction, photoluminescence emission, and X-ray photoelectron spectroscopy were used to characterize the absorbance capability and the crystalline phase, to confirm the presence of boron atoms and to study the nature of chemical compounds, respectively. The well-ordered structure of titania and resistance of its morphology toward electrochemical treatment in H 3 BO 3 were confirmed by scanning electron microscopy images. However, cyclic voltammetry and electrochemical impedance spectroscopy studies showed the significant difference in conductivity and capacitance between doped and pristine titania. Moreover, the photocurrent densities of the B-doped sample were about seven times higher in comparison with those generated by the pure titania nanotube electrode.

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Construction of N, S codoped TiO2 NCs decorated TiO2 nano-tube array photoelectrode and its enhanced visible light photocatalytic mechanism

Cited by 78 publications

References 40 publications

Optimization of electrochemical doping approach resulting in highly photoactive iodine-doped titania nanotubes

Optimization of electrochemical doping approach resulting in highly photoactive iodine-doped titania nanotubes

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Optimization of boron-doping process of titania nanotubes via electrochemical method toward enhanced photoactivity

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