Synthesis of N-Doped TiO2 for Efficient Photocatalytic Degradation of Atmospheric NOx

Khan, Tamal Tahsin; Bari, Gazi A.K.M. Rafiqul; Kang, Hui; Lee, Tae Gyu; Park, Jae‐Woo; Hwang, Hyun Jin; Hossain, Sayed Mukit; Mun, Jong Seok; Suzuki, Norihiro; Fujishima, Akira; Kim, Jong Ho; Shon, Ho Kyong; Jun, Young‐Si

doi:10.3390/catal11010109

Cited by 58 publications

(59 citation statements)

References 51 publications

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“…With respect to the photocatalysis process, TiO 2 as a photocatalyst has recently received considerable attention for the removal of persistent organic pollutants (POPs), including phenols [11], tetracycline [12], dyes [13] and linier alkyl benzene sulphonate [14] due to its cost-effective technology, non-toxicity, quick oxidation rate and chemical stability [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. The practical application of TiO 2 is, however, significantly restricted by its low visible absorption due to its wide bandgap energy (Eg) ≈ 3.20 eV [15][16][17][18][19][20][21][22][23][24][25][26] and immediate charge (electron and hole) recombination [19][20][21][22]. With such wide a band gap, TiO 2 can only be excited by photons with wavelengths shorter than 385 nm emerging in UV region [15][16][17][18][19][20][21][22]…”

Section: Introductionmentioning

confidence: 99%

“…The practical application of TiO 2 is, however, significantly restricted by its low visible absorption due to its wide bandgap energy (Eg) ≈ 3.20 eV [15][16][17][18][19][20][21][22][23][24][25][26] and immediate charge (electron and hole) recombination [19][20][21][22]. With such wide a band gap, TiO 2 can only be excited by photons with wavelengths shorter than 385 nm emerging in UV region [15][16][17][18][19][20][21][22][23][24][25][26]. In fact, UV light only occupies a small portion (about 5%) of the sunlight spectrum [15,[19][20][21]23,24], which limits TiO 2 application under low-cost sunlight or visible irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…With such wide a band gap, TiO 2 can only be excited by photons with wavelengths shorter than 385 nm emerging in UV region [15][16][17][18][19][20][21][22][23][24][25][26]. In fact, UV light only occupies a small portion (about 5%) of the sunlight spectrum [15,[19][20][21]23,24], which limits TiO 2 application under low-cost sunlight or visible irradiation. Moreover, the fast charge recombination leads to a less effective photocatalysis process [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, UV light only occupies a small portion (about 5%) of the sunlight spectrum [15,[19][20][21]23,24], which limits TiO 2 application under low-cost sunlight or visible irradiation. Moreover, the fast charge recombination leads to a less effective photocatalysis process [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media

et al. 2021

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The photocatalysis process over N-doped TiO2 under visible light is examined for Pb(II) removal. The doping TiO2 with N element was conducted by simple hydrothermal technique and using urea as the N source. The doped photocatalysts were characterized by DRUVS, XRD, FTIR and SEM-EDX instruments. Photocatalysis of Pb(II) through a batch experiment was performed for evaluation of the doped TiO2 activity under visible light, with applying various fractions of N-doped, photocatalyst mass, irradiation time, and solution pH. The research results attributed that N doping has been successfully performed, which shifted TiO2 absorption into visible region, allowing it to be active under visible irradiation. The photocatalytic removal of Pb(II) proceeded through photo-oxidation to form PbO2. Doping N into TiO2 noticeably enhanced the photo-catalytic oxidation of Pb(II) under visible light irradiation. The highest photocatalytic oxidation of 15 mg/L Pb(II) in 25 mL of the solution could be reached by employing TiO2 doped with 10%w of N content 15 mg, 30 min of time and at pH 8. The doped-photocatalyst that was three times repeatedly used demonstrated significant activity. The most effective process of Pb(II) photo-oxidation under beneficial condition, producing less toxic and handleable PbO2 and good repeatable photocatalyst, suggest a feasible method for Pb(II) remediation on an industrial scale.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media

et al. 2021

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“…Since Honda and Fujishima reported photoelectrolysis photoelectrodes without an external power source in 1972 [ 1 ], TiO 2 has been drawing substantial attention, and many studies have been conducted to apply TiO 2 to various industrial fields, such as sensors [ 2 , 3 , 4 , 5 ], drug delivery systems [ 6 , 7 , 8 ], photocatalysts [ 9 , 10 , 11 , 12 ], and photoelectrodes [ 13 , 14 , 15 ]. TiO 2 has many attractive properties; among them, non-toxicity, strong durability, and excellent chemical stability are regarded as suitable photocatalyst properties for water purification.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Photocatalytic Properties of Electrospun Fe-Doped TiO2 Nanofibers Using Polyvinyl Pyrrolidone Precursors

Kim

Yoon

et al. 2021

Polymers

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For the removal of pollutants, a modified TiO2 photocatalyst is attracting attention. Fe-doped TiO2 nanofibers were prepared through a combination of electrospinning and calcination. Morphological characterization of the sample was conducted using field-emission scanning electron and transmission electron microscopy. The crystal structure of each sample was analyzed using high-resolution transmission electron microscopy, selected area electron diffraction, and Fast Fourier Transform imaging. The average diameter of the Fe-doped TiO2 nanofibers was measured to be 161.5 nm and that of the pure TiO2 nanofibers was 181.5 nm. The crystal phase when heat treated at 350 °C was anatase for TiO2 nanofibers and rutile for Fe-doped TiO2 nanofibers. The crystal phase of the TiO2 matrix was easily transitioned to rutile by Fe-doping. The photocatalytic performance of each sample was compared via the photodegradation of methylene blue and acid orange 7 under ultraviolet and visible light irradiation. In the Fe-doped TiO2 nanofibers, photodegradation rates of 38.3% and 27.9% were measured under UV irradiation and visible light, respectively. Although other catalysts were not activated, the photodegradation rate in the Fe-doped TiO2 nanofibers was 9.6% using acid orange 7 and visible light. For improved photocatalytic activity, it is necessary to study the concentration control of the Fe dopant.

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Optimization of imidacloprid photocatalytic degradation under UVA‐LED irradiation conditions

Duplančić

Liber

Zelić

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND This research deals with the photocatalytic degradation of the neonicotinoid insecticide imidacloprid. The reaction was carried out using a flat‐plate photoreactor in recirculated batch mode over an immobilized layer of a nitrogen‐doped TiO2 photocatalyst. The characterization of the prepared photocatalyst was performed using various instrumental techniques. The irradiation sources used were UV 365 nm high‐power light‐emitting diodes (LEDs) with various powers (20 and 30 W) and irradiation intensities. The radiation intensities were changed by adjusting the voltage supplied to the UVA‐LED radiation source. Design of experiments was used to evaluate the influence of three selected variables, namely initial concentration of imidacloprid solution, pH and UVA‐LED irradiance, on the photodegradation efficiency. RESULTS Doping the photocatalyst with nitrogen using urea as the nitrogen source leads to a decrease in the bandgap, Eg, compared to the characteristic values obtained for a commercial unmodified TiO2‐P25 photocatalyst (2.92 ± 0.021 versus 3.38 ± 0.015 eV). Analysis of the results using the Design‐Expert software package showed that irradiance was the most significant factor in the process studied. CONCLUSIONS Treatment of TiO2 with urea is more efficient method of TiO2 modification than nitrogen plasma pretreatment which resulted in a smaller decrease in Eg. The statistical parameters of the model equation obtained from analysis of variance confirmed the satisfactory fit of the proposed reduced cubic model to the experimental data. The results of kinetic analysis showed that the photocatalytic degradation of imidacloprid can be described by pseudo‐first‐order kinetics. © 2022 Society of Chemical Industry (SCI).

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Synthesis of N-Doped TiO2 for Efficient Photocatalytic Degradation of Atmospheric NOx

Cited by 58 publications

References 51 publications

Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media

Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media

Fabrication and Photocatalytic Properties of Electrospun Fe-Doped TiO2 Nanofibers Using Polyvinyl Pyrrolidone Precursors

Optimization of imidacloprid photocatalytic degradation under UVA‐LED irradiation conditions

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