Oxygen vacancies promoted heterogeneous catalytic ozonation of atrazine by defective 4A zeolite

Su, Linfeng; Xu, Chen; Wang, Hui; Wang, Yude; Lu, Zhiyi

doi:10.1016/j.jclepro.2022.130376

Cited by 21 publications

(5 citation statements)

References 68 publications

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“…Through the estimation of the valence band maximum (VBM) and the energy band gap (E g ) from XPS and UV-vis spectroscopy; it was possible to build a schematic band edge representation of the two ZnO compounds, figure 9. It is observed that vacancies in the black ZnO structure causes a modification of the band edges moving into a region within a more oxidative character, proposing to black ZnO as a reasonable promotor of OH radicals [14,18]; and thus, opening their exploration as a feasible photocatalyst in the UV visible region; in good concordance with preceding reports where vacancies in the structure of the compounds promotes their catalytic performance [74][75][76][77][78][79].…”

Section: Resultssupporting

confidence: 87%

Black ZnO nanoparticles synthesized by a green chemistry process

León-Flores,

Melo-Uscanga,

Pérez-Mazariego

et al. 2024

Nano Ex.

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The green chemistry synthesis has acquired importance in recent years because of the avoidance of hazardous byproducts. In the present work, black ZnO nanoparticles were synthesized by a combustion green chemistry process using coffee extract as a reducer agent and stabilizer of the reaction. The preponderance size distribution of the black ZnO nanoparticles was found between 15 and 30 nm. High-resolution transmission electron microscopy shows distorted regions from the atomic column, while the estimated energy band gap measured by UV-Vis spectroscopy is 2.22 eV, which is a 30% value below the typical band gap for bulk ZnO. XPS measurements display a shift in the binding energy of the black ZnO compared against commercial ZnO. From the experimental evidence, it is proposed that the black color of the zinc oxide was a consequence of vacancies in the ZnO structure. Vacancies in the structure were modeled theoretically by considering a variation in the Coulomb interaction between Zn – O atoms by applying the Hubbard + U DFT approximation. The theoretical electronic distribution of the vacant ZnO was compared with experimental results obtained by Raman, FTIR and the experimental profile of the valence band region. These results open the exploration of green synthesized black zinc oxide nanoparticles to many technological applications.

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Section: Resultssupporting

confidence: 87%

Black ZnO nanoparticles synthesized by a green chemistry process

León-Flores,

Melo-Uscanga,

Pérez-Mazariego

et al. 2024

Nano Ex.

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“…k was considered the main indicator to evaluate the catalytic Photo-Fenton rate of CIP, which was calculated by the pseudo-first-order kinetic pattern following eq : ln ⁡ C t / C 0 = − k t where C 0 is the initial concentration of CIP, C t is the concentration of CIP at reaction time t , and k is the pseudo-first-order constant (min –1 ).…”

Section: Methodsmentioning

confidence: 99%

“…where D, C 0 , and C represent the degradation rate, initial concentration, and remaining concentration at different times, respectively. k was considered the main indicator to evaluate the catalytic Photo-Fenton rate of CIP, 39 which was calculated by the pseudo-first-order kinetic pattern following eq 4:…”

Section: Catalytic Tests Of Photo-fenton Activationmentioning

confidence: 99%

Integration of Atomically Dispersed Cu–N₄ Sites with C₃N₄ for Enhanced Photo-Fenton Degradation over a Nonradical Mechanism

Dong

Chen

et al. 2022

ACS EST Eng.

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Photo-Fenton degradation as a promising strategy for antibiotic wastewater treatment attracted extensive attention, while the unsatisfactory catalytic performance vitally limits its industrial application. Herein, we demonstrate that confining atomically dispersed Cu into C3N4 (Cu–C3N4) enables fast H2O2 activation and efficient separation of photogenerated electron–hole pairs, resulting in a dramatic improvement of the degradation efficiency of the Photo-Fenton reaction. Photo-Fenton degradation of ciprofloxacin (CIP) was close to 99% within 30 min over optimized Cu–C3N4, corresponding to a pseudo-first-order rate constant of ∼0.0978 min–1, almost 4.5 times higher than pure C3N4 counterpart. The electron paramagnetic resonance, quenching experiments, and X-ray absorption fine structure results reveal that the superior Photo-Fenton catalytic performance is attributed to a nonradical reaction pathway, where the H2O2 is activated by the formation of the OCu–N4O intermediate. The advanced catalyst as well as the refreshing H2O2 activation mechanism are of profound significance for the materials design in the wastewater treatment field.

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“…126 Lots of researchers have proved excellent adsorption and facilitated decomposition of O 3 by OVs. [127][128][129][130] Liang's group synthesised different catalysts by lattice-doping cobalt into zinc ferrite spinel, altering the amount of doping, and subsequently compared their catalytic properties and morphologies. They found the material exhibited the highest performance when the atomic molar ratio of Fe : Co is 8 : 2, and it is abundant in surface OVs.…”

Section: Application In Fenton-like Oxidationmentioning

confidence: 99%

The roles of the oxygen vacancies caused by the ion doping method in catalytic materials and their applications in advanced oxidation processes

Nie,

Lai,

et al. 2023

New J. Chem.

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Oxygen vacancies promoted heterogeneous catalytic ozonation of atrazine by defective 4A zeolite

Cited by 21 publications

References 68 publications

Black ZnO nanoparticles synthesized by a green chemistry process

Black ZnO nanoparticles synthesized by a green chemistry process

Integration of Atomically Dispersed Cu–N₄ Sites with C₃N₄ for Enhanced Photo-Fenton Degradation over a Nonradical Mechanism

The roles of the oxygen vacancies caused by the ion doping method in catalytic materials and their applications in advanced oxidation processes

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Oxygen vacancies promoted heterogeneous catalytic ozonation of atrazine by defective 4A zeolite

Cited by 21 publications

References 68 publications

Black ZnO nanoparticles synthesized by a green chemistry process

Black ZnO nanoparticles synthesized by a green chemistry process

Integration of Atomically Dispersed Cu–N4 Sites with C3N4 for Enhanced Photo-Fenton Degradation over a Nonradical Mechanism

The roles of the oxygen vacancies caused by the ion doping method in catalytic materials and their applications in advanced oxidation processes

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Product

Resources

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Integration of Atomically Dispersed Cu–N₄ Sites with C₃N₄ for Enhanced Photo-Fenton Degradation over a Nonradical Mechanism