Comparison of highly active Type-I and Type-II heterojunction photocatalytic composites synthesized by electrospinning for humic acid degradation

Wang, Chencheng; Ni, Huicheng; Dai, Jing; Liu, Tingrui; Wu, ZhiYi; Chen, Xingwang; Dong, Zhen‐Rong; Qian, Junchao; Wu, Zhiren

doi:10.1016/j.cplett.2022.139815

Cited by 30 publications

(2 citation statements)

References 48 publications

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“…However, with the highest concentration, k and t 1/2 are 14 times lower and 16 times higher, respectively, and SMZ is partially eliminated (Table 1). This is probably due to a larger amount of SMZ to be degraded and to an absorbance competition between SMZ and the decatungstate anions, this being unfavorable for the photocatalytic reaction [17,45,46]. However, considering that the pollutant concentration under real natural conditions ranges from a few nanograms/liter to µg/L, it is reasonable to assume that this photocatalytic process could achieve complete degradation of SMZ and possibly its mineralization [47][48][49].…”

Section: Pollutant Concentration Effectmentioning

confidence: 99%

Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach

Edaala,

El Mersly,

Aloui Tahiri

et al. 2023

Water

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The aim of this study is to propose a successful method for the treatment of water contaminated by pharmaceutical pollutants through homogeneous photocatalysis in the presence of decatungstate ions (W10O324−). Sulfamethazine (SMZ), a sulfonamide antibiotic, was used as a model molecule. The results showed that SMZ could be effectively degraded with this process under simulated solar irradiation. SMZ degradation kinetics were studied with different dioxygen and SMZ concentrations, pH values, and photocatalyst masses. Optimal conditions were determined to be pH 7, [Na4W10O32] = 0.33 g/L, and [SMZ] = 13.9 mg/L under the aerated condition, resulting in 85% SMZ degradation in 240 min, using a 36W-UVA/UVB light source. Hydroxyl radicals were identified as the major contributors to SMZ elimination. Four photoproducts identified with high-performance liquid chromatography coupled with mass spectrometry were formed by the cleavage of the sulfonamide bond and the hydroxylation of both the aromatic ring and pyrimidine moiety. SMZ was completely mineralized after 90 h of irradiation in the presence of decatungstate anions. These results provided a mechanism for the photocatalytic degradation of SMZ in an aqueous solution. To sustain this mechanism, theoretical studies were carried out using density functional theory calculations. This involved Fukui functional analyses, including ring hydroxylation, C-S bond cleavage, and molecular rearrangement processes.

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Section: Pollutant Concentration Effectmentioning

confidence: 99%

Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach

Edaala,

El Mersly,

Aloui Tahiri

et al. 2023

Water

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“…Transfer and separation of electron-hole pairs between materials are allowed to occur in type-I and type-II heterojunctions, while these processes are hindered in type-III heterojunctions due to the absence of overlapping band gaps. [5,6] Therefore, the study of type-I and type-II heterojunctions currently occupies a key position in the field of optoelectronics.…”

Section: Introductionmentioning

confidence: 99%

Interfacial photoconductivity effect of type-I and type-II Sb₂Se₃/Si heterojunctions for THz wave modulation

Cao 曹,

Huang 黄,

Xi 席

et al. 2023

Chinese Phys. B

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In-depth understanding of the photoconductivity and photocarrier density at the interface is of great significance for improving the performance of optoelectronic devices. However, the extraction of the photoconductivity and photocarrier density at the heterojunction interface still remains elusive. Herein, we have obtained the photoconductivity and photocarrier density of the 173 nm-Sb2Se3/Si (type-Ⅰ heterojunction) and 90 nm-Sb2Se3/Si (type-Ⅱ heterojunction) utilizing the terahertz (THz) time-domain spectroscopy (THz-TDS) and theoretical Drude model. Since type-Ⅰ heterojunction accelerates carrier recombination and type-Ⅱ heterojunction accelerates carrier separation, the photoconductivity and photocarrier density of type-Ⅱ heterojunction (21.8×104 S/m, 1.5×1015 cm-3) are higher than that of type-Ⅰ heterojunction (11.8×104 S/m, 0.8×1015 cm-3). These results demonstrate that the type-Ⅱ heterojunction is superior to type-Ⅰ heterojunction for THz wave modulation. This work highlights the THz-TDS as an effective tool to study the photoconductivity and photocarrier density at the heterojunction interface. In turn, the intriguing interfacial photoconductivity effect provides a way to improve the THz wave modulation performance.

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ZnO Modified g‐C₃N₄–MnO₂ Composite for Photodegradation of Methylene Blue

Gindose,

Atisme,

Hailegebreal

et al. 2025

ChemistrySelect

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Single ZnO (NM1), MnO2 (NM2) nanoparticles, and MnO2–g‐C3N4–ZnO (NM4) nanocomposite were synthesized by the sol–gel method, whereas g‐C3N4 (NM3) was synthesized by polymerization of urea. The as‐synthesized materials were characterized by thermogravimetric‐differential thermal (TGA‐TDA), Fourier transformer (FTIR), X‐ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), and high‐resolution transmission electron microscopy (HRTEM).The bandgap of the NM4 nanocomposite was lower than those of NM1, NM2, and NM3 photocatalysts, which is applicable in the visible region. The photocatalytic activities of the synthesized materials were studied under visible light radiation. The efficacy of NM4 composite is 5, 3.4, and 3‐fold higher than those of NM1, NM2, and NM3 materials. This enhancement might be ascribed to the synergistic effect. Besides, the NM4 nanocomposite degraded 94% of methylene blue (MB) and 81% of the real sample. The rate constant (k) for NM1, NM2, NM3, and NM4 nanocomposite was also studied and resulted in 0.00327, 0.0046, 0.0056, and 0.0156 min−1, respectively. The reusing of NM4 nanocomposite was carried out for four sequential rounds and resulted in 94%, 92.6%, 91%, and 89% degradation efficiency for 1st, 2nd, 3rd, and 4th round, respectively. This result suggests that the synthesized NM4 is cost‐effective and stable.

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Comparison of highly active Type-I and Type-II heterojunction photocatalytic composites synthesized by electrospinning for humic acid degradation

Cited by 30 publications

References 48 publications

Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach

Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach

Interfacial photoconductivity effect of type-I and type-II Sb₂Se₃/Si heterojunctions for THz wave modulation

ZnO Modified g‐C₃N₄–MnO₂ Composite for Photodegradation of Methylene Blue

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Comparison of highly active Type-I and Type-II heterojunction photocatalytic composites synthesized by electrospinning for humic acid degradation

Cited by 30 publications

References 48 publications

Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach

Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach

Interfacial photoconductivity effect of type-I and type-II Sb2Se3/Si heterojunctions for THz wave modulation

ZnO Modified g‐C3N4–MnO2 Composite for Photodegradation of Methylene Blue

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Product

Resources

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Interfacial photoconductivity effect of type-I and type-II Sb₂Se₃/Si heterojunctions for THz wave modulation

ZnO Modified g‐C₃N₄–MnO₂ Composite for Photodegradation of Methylene Blue