Oxygen defects-mediated Z-scheme charge separation in g-C3N4/ZnO photocatalysts for enhanced visible-light degradation of 4-chlorophenol and hydrogen evolution

Wang, Jing; Xia, Yi; Zhao, Hongyuan; Wang, Guifang; Liu, Xiang; Xu, Jianlong; Komarneni, Sridhar

doi:10.1016/j.apcatb.2017.01.067

Cited by 370 publications

(120 citation statements)

References 65 publications

Supporting

Mentioning

119

Contrasting

Order By: Relevance

“…9, the mineralization efficiencies of ciprofloxacin, ofloxacin and norfloxacin can reach 65.22%, 60.23% and 55.21%, respectively. This result indicated that antibiotics was quickly oxidized and converted to CO 2 , H 2 O and smaller organic molecules, which is consistent with the literatures (51,52).…”

Section: Photocatalytic Performance Evaluationsupporting

confidence: 92%

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Yao

Cao

et al. 2019

Photochem & Photobiology

View full text Add to dashboard Cite

In this work, a series of novel SnO2/ZnO nanocomposites with different morphologies were fabricated via a facile hydrothermal technique followed by calcination in air. The morphological, structural and photocatalytic properties of the SnO2/ZnO nanocomposites were studied using different methods. The results showed that the synthesized nanocomposites possessed crystal phases of wurtzite hexagonal phase ZnO and tetragonal rutile phase SnO2. In addition, the morphologies of SnO2/ZnO nanocomposites strongly depended on the molar ratios of Sn and Zn. Compared with ZnO and SnO2, the SnO2/ZnO nanocomposites exhibited considerably higher degradation efficiency for the photodegradation of methylene blue and quinolone antibiotics under mercury lamp irradiation. The SZ‐2 nanospheres exhibited the highest degradation efficiency of 95.81%, which was about 2.63 times higher than that of ZnO nanoparticles. Moreover, the trapping experiments confirmed that ˙OH played the dominant role in MB degradation. Finally, the charge carriers potential transfer pathway and photocatalytic degradation mechanism were put forward. This study provides an economical way to prepare hybrid nanocomposites with controlled morphology for practical applications in the photocatalytic degradation of organic dyes and residual antibiotics.

show abstract

Section: Photocatalytic Performance Evaluationsupporting

confidence: 92%

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Yao

Cao

et al. 2019

Photochem & Photobiology

View full text Add to dashboard Cite

show abstract

“…In this case, the eare accumulated in the CB of g-C 3 N 4 and h + in the VB of ZnO. Due to these two mechanisms, a prolonged lifetime of electrons and holes is gained [14].…”

Section: Proposed Mechanism For Photocatalytic Activity Enhancementmentioning

confidence: 97%

“…Although g-C 3 N 4 has attracted increasing interest worldwide, its photocatalytic performance is still limited due to fast recombination of charge carriers [10][11][12][13]. Enhancing the photoactivity of g-C 3 N 4 -based photocatalysts can be achieved by the construction of semiconductors' heterojunctions [13,14]. The combination of different semiconductor photocatalysts may create new materials with optimal performances.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Decomposition of N2O by Using Nanostructured Graphitic Carbon Nitride/Zinc Oxide Photocatalysts Immobilized on Foam

et al. 2019

View full text Add to dashboard Cite

The aim of this work was to deposit cost-effective g-C 3 N 4 /ZnO nanocomposite photocatalysts (weight ratios of g-C 3 N 4 :ZnO from 0.05:1 to 3:1) as well as pure ZnO and g-C 3 N 4 on Al 2 O 3 foam and to study their photocatalytic efficiency for the photocatalytic decomposition of N 2 O, which was studied in a home-made batch photoreactor under ultraviolet A irradiation (λ = 365 nm). Based on the photocatalysis measurements, it was found that photocatalytic decomposition of N 2 O in the presence of all the prepared samples was significantly higher in comparison with photolysis. The photoactivity of the investigated nanocomposite photocatalysts increased in the following order: g-C 3 N 4 /ZnO (3:1) ≈ g-C 3 N 4 /ZnO (0.45:1) ≤ g-C 3 N 4 /ZnO (2:1) ZnO < g-C 3 N 4 < g-C 3 N 4 /ZnO (0.05:1). The g-C 3 N 4 /ZnO (0.05:1) nanocomposite showed the best photocatalytic behavior and the most effective separation of photoinduced electron-hole pairs from all nanocomposites. The key roles played in photocatalytic activity were the electron-hole separation and the position and potential of the valence and conduction band. On the other hand, the specific surface area and band gap energy were not the significant factors in N 2 O photocatalytic decomposition. Immobilization of the photocatalyst on the foam permits facile manipulation after photocatalytic reaction and their repeated application.

show abstract

“…The broad peak at 2θ = 10.7°corresponds to the interlayer structural packing motif of tri-s-triazine units. [16] Only the peak at 2θ = 27.5°has appeared for the nanocomposites. The disappearance of the peak at around 10.7 indicates the decreased the planar size of g-C 3 N 4 .…”

Section: Characterizationmentioning

confidence: 99%

“…The photocatalytic activity of nanohybrid was greater than that of g-C 3 N 4 . Wang et al [16] prepared g-C 3 N 4 /ZnO to degrade 4chlorophenol (4-CP) in water under visible-light. They found that g-C 3 N 4 (10 %)/ZnO could degrade approximately 95 % of 4-CP within 60 min of visible-light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

2020

View full text Add to dashboard Cite

An azo dye, Reactive Black 5 (RB5), was degraded by three photocatalysts of g‐C3N4, Ag(2 %)/g‐C3N4, and Ag(5 %)/g‐C3N4 with the specific surface areas of 34.41, 28.70, and 35.58 m2 g−1 and the band gaps of 2.52, 1.56, and 1.71 eV under sunlight illumination, respectively. The results showed 40 mg/L of g‐C3N4 could degrade completely 10 ppm RB5 at pH 3.4 within 10 min under sunlight irradiation with the first‐order rate constant of 0.312 min−1. Under the same conditions, the complete degradation time of RB5 reduced to 5 and 7 min when the plasmonic nanocomposites of Ag (2 %)/g‐C3N4 and Ag (5 %)/g‐C3N4 were used as photocatalysts, respectively. Ag content had an important influence on the photocatalytic activity of g‐C3N4 against RB5 so that Ag (2 %)/g‐C3N4 possessed the best photocatalytic efficiency with the rate constant of 0.795 min−1. In fact, Ag nanoparticles through the surface plasmon resonance effects and by accepting the photogenerated electrons could improve the visible‐light absorption and increase charge separation of g‐C3N4. The results showed superoxide radical is the main oxidant in the photodegradation of RB5.

show abstract

Oxygen defects-mediated Z-scheme charge separation in g-C3N4/ZnO photocatalysts for enhanced visible-light degradation of 4-chlorophenol and hydrogen evolution

Cited by 370 publications

References 65 publications

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Photocatalytic Decomposition of N2O by Using Nanostructured Graphitic Carbon Nitride/Zinc Oxide Photocatalysts Immobilized on Foam

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

Contact Info

Product

Resources

About

Oxygen defects-mediated Z-scheme charge separation in g-C3N4/ZnO photocatalysts for enhanced visible-light degradation of 4-chlorophenol and hydrogen evolution

Cited by 370 publications

References 65 publications

Morphology‐controlled Fabrication of SnO2/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Morphology‐controlled Fabrication of SnO2/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Photocatalytic Decomposition of N2O by Using Nanostructured Graphitic Carbon Nitride/Zinc Oxide Photocatalysts Immobilized on Foam

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C3N4 Nanocomposites

Contact Info

Product

Resources

About

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites