Dual enhancement of capturing photogenerated electrons by loading CoP nanoparticles on N-deficient graphitic carbon nitride for efficient photocatalytic degradation of tetracycline under visible light

Shi, Weilong; Shu, Keke; Sun, Haoran; Ren, Hongji; Li, Mingyang; Chen, Fangyan

doi:10.1016/j.seppur.2020.116930

Cited by 121 publications

(24 citation statements)

References 41 publications

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“…In addition, the valence band (VB) of ZnO (2.615 eV vs, NHE) and the HOMO level of Chitosan (2.1 eV vs. NHE) has more positivity than / (1.99 eV vs. NHE). Thus, the created holes on the VB of ZnO and the HOMO of Chitosan oxidize to generate , that is equal to the results of the trapping test 53 , 54 . Therefore, radicals produced by electrons that act as an efficient oxidant that react with MB dye molecules and decompose the dye to carbon dioxide and water.…”

Section: Resultsmentioning

confidence: 63%

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Malekkiani

Magham

Ravari

et al. 2022

Sci Rep

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Developing a cheap, stable and effective photocatalyst is necessary for remediation of persistent organic pollutants. To address this challenge, we proposed a unique interfacial engineering technique and proper bandgap matching strategy to synthesize MWCNTs/ZnO/Chitosan ternary nanocomposite for effective photocatalytic application. The features of the prepared samples were determined by FESEM, TEM, EDX, elemental mapping, AFM, FT-IR, XRD, UV–Vis spectroscopy and BET surface analysis. The obtained results showed successful fabrication of synthesized nanocomposites with enhanced surface area. Degradation effect of nanostructures on methylene blue (MB) and antibacterial activity against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis) pathogenic strains were investigated. The proposed photocatalytic mechanism illustrated the electron transfer facilitated by MWCNTs/ZnO/Chitosan structure which results in spatial separation of electron–hole pairs. Compared with ZnO and ZnO/Chitosan, the prepared MWCNTs/ZnO/Chitosan ternary nanocomposite showed high usage of UV illumination and superior separation of photogenerated electron–hole pairs. MWCNTs/ZnO/Chitosan illustrated 86.26% adsorption rate and outstanding increased photocatalytic activity on MB degradation efficiency of 98.76% after 20 min. Stability of photocatalyst reached from 98.76% initial decolorization to 85% at the fourth cycle. In addition, the ternary nanocomposite also exhibited remarkable bactericidal activity against gram-positive (S. aureus) and (B. subtilis) and gram-negative (E. coli) bacteria strains. Due to the obtained results, the prepared nanocomposite would be an efficient candidate photocatalyst with antibacterial properties.

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Section: Resultsmentioning

confidence: 63%

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Malekkiani

Magham

Ravari

et al. 2022

Sci Rep

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“…6(b)), the peaks located at 284.4 eV and 287.8 eV were attributed to the sp 2 C C bonds and sp 2 -bonded carbon (N C N), respectively. 28 For N 1 s spectrum (Fig. 6(c)), it In order to study the optical absorption capacity of synthetic samples, UV-vis spectra and the corresponding digital Under visible light irradiation (⊗ > 420 nm), the photocatalytic performance of the as-synthesized photocatalysts was checked via the degradation of TC.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of ternary CoO/g‐C₃N₄/Co₃O₄ nanocomposite with p‐n‐p type heterojunction for boosted visible‐light photocatalytic performance

Zhang

Shi

Sun

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Photocatalytic water treatment by using semiconductor material with low-cost, along with green and environmental features, is the main candidate for the actual application of photocatalytic reactions. RESULTS:The ternary CoO/g-C 3 N 4 /Co 3 O 4 nanocomposite with p-n-p type heterojunction was fabricated through a one-step solvothermal method follow-up water washing process. The as-prepared CoO/g-C 3 N 4 /Co 3 O 4 nanocomposite photocatalyst exhibited high visible-light photocatalytic efficiency (92% within 80 min) during the degradation of tetracycline (TC). The degradation rate constant of CoO/g-C 3 N 4 /Co 3 O 4 nanocomposite is 0.025 min −1 , which is 8.3, 4.3 and 2.3 times higher than that of single CoO, g-C 3 N 4 and binary CoO/g-C 3 N 4 , respectively. CONCLUSION: A series of characterization experiments further confirmed that the photocatalytic performance of the synthesized CoO/g-C 3 N 4 /Co 3 O 4 composite materials was improved due to the following two points: (i) improved separation and migration ability of photo-induced electron-hole pairs, and (ii) enhanced visible light absorption range.

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“…The electronic energy band structures of the prepared samples have been analyzed by the UV-vis diffuse reflectance spectrum (Figure 5a). The pristine g-C 3 N 4 absorption band edge is 440 nm , [38] however those of HPBP, HPTP, and HPF were significantly enlarged and bathochromically shifted, indicating that their visible-light absorption are much enhanced and more photogenerated electrons and holes can be utilized. The Kubelka-Munk formula is used to further analyze the band gaps (E g , Figure 5b) of the three polymers with HPBP of 1.77 eV, HPTP of 1.73 eV as well as HPF of 1.66 eV, which are much narrower than that of g-C 3 N 4 (2.66 eV), [50] indicating that the D-A conjugated strategy could indeed tune their electronic energy bands and thus photocatalytic efficiencies.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

Donor‐Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines

Zeng

et al. 2021

Macromol. Rapid Commun.

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Photocatalysis is an efficient and green technology in the environmental protection. Due to the high charge separation and transfer, donor-acceptor (D-A) conjugated polymers attract much attention for their photocatalytic degradations towards organic pollutants. Herein, the authors reported three novel D-A conjugated polymers, named as HPBP, HPTP, and HPF, with heptazine moieties as electron acceptors, while biphenyl, terphenyl, or fluorene moieties as electron donors, respectively, which indeed exhibit a highly efficient photocatalytic degradation towards tetracyclines upon the visible-light irradiation. Among them, the photocatalytic performance of HPF is especially noticeable with the degradation rate up to 87% within 30 min, almost 11 times in comparison to those of pristine g-C 3 N 4 , which is mainly attributed to its high crystallinity and conjugation. For their photocatalytic mechanism, the •O 2 radical anions are regarded as the active species.

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Dual enhancement of capturing photogenerated electrons by loading CoP nanoparticles on N-deficient graphitic carbon nitride for efficient photocatalytic degradation of tetracycline under visible light

Cited by 121 publications

References 41 publications

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Fabrication of ternary CoO/g‐C₃N₄/Co₃O₄ nanocomposite with p‐n‐p type heterojunction for boosted visible‐light photocatalytic performance

Donor‐Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines

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Dual enhancement of capturing photogenerated electrons by loading CoP nanoparticles on N-deficient graphitic carbon nitride for efficient photocatalytic degradation of tetracycline under visible light

Cited by 121 publications

References 41 publications

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Fabrication of ternary CoO/g‐C3N4/Co3O4 nanocomposite with p‐n‐p type heterojunction for boosted visible‐light photocatalytic performance

Donor‐Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines

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Fabrication of ternary CoO/g‐C₃N₄/Co₃O₄ nanocomposite with p‐n‐p type heterojunction for boosted visible‐light photocatalytic performance