Degradation of bisphenol A by peroxymonosulfate activated with oxygen vacancy modified nano-NiO-ZnO composite oxides: A typical surface-bound radical system

You, Jingsong; Sun, Wei; Su, Shijun; Ao, Zhimin; Liu, Chao; Yao, Gang; Lai, Bo

doi:10.1016/j.cej.2020.125915

Cited by 138 publications

(33 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Notably, the lattice fringes of 200Fe–Co LDH (Figure b) become disordered in comparison with the precursor of Fe–Co LDH (Figure S2f), which confirms the formation of Vo because the release of the lattice O atom leads to poor crystal property . Some obvious vibrational spectra (detailed analysis in Texts S4 and S5) of Fe–O and Co–O are found in FTIR (Figure S1b) and Raman (Figure S1c) analyses. ,, Moreover, it is seen that Fe, Co, and O elements are uniformly distributed throughout the whole 200Fe–Co LDH, with an Fe/Co ratio of 2:1 (Figure S2g, 2h). These observations evidently confirm the successful synthesis of Vo-containing Fe–Co LDH.…”

Section: Resultsmentioning

confidence: 92%

“…Under the same reaction condition, the removal efficiencies of BPA, resorcinol, phenol, 4-CP, p -nitrophenol, and BA show a significant difference within 10 min, with values of ∼68, ∼60, ∼49, ∼37, ∼28, and ∼26%, respectively. After the reaction proceeds to 60 min, BPA and resorcinol are almost degraded, different from the degradation of BA (∼58%), which is a typical probe for SO 4 •– . The selective degradation of organics, as well as less contribution of SO 4 •– , suggests that it might be a nonradical-dominant oxidation process .…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O₂) in the Fe–Co LDH/Peroxymonosulfate System

Sun

Zhen

et al. 2021

Environ. Sci. Technol.

326

View full text Add to dashboard Cite

Ubiquitous oxygen vacancies (Vo) existing in metallic compounds can activate peroxymonosulfate (PMS) for water treatment. However, under environmental conditions, especially oxygenated surroundings, the interactions between Vo and PMS as well as the organics degradation mechanism are still ambiguous. In this study, we provide a novel insight into the PMS activation mechanism over Vo-containing Fe−Co layered double hydroxide (LDH). Experimental results show that Vo/PMS is capable of selective degradation of organics via a single-electron-transfer nonradical pathway. Moreover, O 2 is firstly demonstrated as the most critical trigger in this system. Mechanistic studies reveal that, with abundant electrons confined in the vacant electron orbitals of Vo, O 2 is thermodynamically enabled to capture electrons from Vo to form O 2•− under the imprinting effect and start the activation process. Simultaneously, Vo becomes electron-deficient and withdraws the electrons from organics to sustain the electrostatic balance and achieve organics degradation (32% for Bisphenol A without PMS). Different from conventional PMS activation, under the collaboration of kinetics and thermodynamics, PMS is endowed with the ability to donate electrons to Vo as a reductant other than an oxidant to form 1 O 2 . In this case, 1 O 2 and O 2•− act as the indispensable intermediate species to accelerate the circulation of O 2 (as high as 14.3 mg/L) in the micro area around Vo, and promote this nanoconfinement electron-recycling process with 67% improvement of Bisphenol A degradation. This study provides a brand-new perspective for the nonradical mechanism of PMS activation over Vo-containing metallic compounds in natural environments.

show abstract

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O₂) in the Fe–Co LDH/Peroxymonosulfate System

Sun

Zhen

et al. 2021

Environ. Sci. Technol.

326

View full text Add to dashboard Cite

show abstract

“…The fitted background used in the analysis is the Shirley type, and all the binding energies were calibrated using the C 1s carbon signal at 284.8 eV. As shown in Figure a, 531.5, 529.9, and 533.6 eV are ascribed to oxygen vacancy (O v ), , lattice oxygen (O L ), and surface-adsorbed oxygen , for the ZnO–NiO sample, respectively, and are 531.6, 530.2, and 533.3 eV for the ZnO–Al 2 O 3 –NiO sample. The ratio O v /O L for the ZnO–Al 2 O 3 –NiO sample is apparently higher than that of the other samples, indicating that more deficient oxygen species, especially interface oxygen vacancies, , are formed.…”

Section: Resultsmentioning

confidence: 99%

Accelerated Proton Transport Based on a p-i-n Heterostructure Membrane for Low-Temperature Solid Oxide Fuel Cells

Jiang

Wang

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

The p-i-n junction structure has garnered great interest from researchers due to its increased photoactive area and wider space charger region compared with that of the p-n junction. Herein the ultrawide bandgap (∼6.7 eV) semiconductor alumina (Al2O3) has been introduced to construct a p-i-n junction with ZnO and NiO. ZnO–Al2O3–NiO powders are suitable for electrolyte membrane material of low-temperature solid oxide fuel cells (LT-SOFCs). The insulating Al2O3 brings a doubled depletion region and more effective charge separation compared with the p-n junction consisting of ZnO and NiO. The fuel cell based on the p-i-n junction membrane material delivers an enhanced maximum power density (MPD) of 917 mW cm–2 along with a high open-circuit voltage (OCV) of 1.013 V at 550 °C. An analysis based on the space charge region and energy band alignment in the p-i-n junction is proposed to account for the appreciable cell performance and ionic conductivity, as well as the electron blocking and charge separation ability. This study presents a practical p-i-n junction design based on ZnO–Al2O3–NiO via a solution process for LT-SOFC electrolyte material and sheds light on the extensive exploration of p-i-n junctions applied in LT-SOFCs.

show abstract

“…With the presence of surface oxygen vacancy, the free radicals were formed more quickly, leading to better degradation efficiency. Moreover, surface oxygen vacancy could be considered as a defect on the catalyst surface, acting as the reactive sites, which was effective to prevent the recombination of photo-generated holes/electrons, leading to better catalytic activity [52]. Additionally, the visible region of catalyst was also extended, which was helpful for the visible light adsorption on the surface.…”

Section: Proposed Reaction Mechanismmentioning

confidence: 99%

Visible Light Driven Spherical CuBi2O4 with Surface Oxygen Vacancy Enhanced Photocatalytic Activity: Catalyst Fabrication, Performance, and Reaction Mechanism

et al. 2020

View full text Add to dashboard Cite

Here, a spherical CuBi2O4 catalyst with surface oxygen vacancy was fabricated through a facile hydrothermal method, which exhibited remarkable enhanced photocatalytic activity of refractory chemicals in the heterogeneous sulfate radical-based Fenton-like reaction under visible light emitting diode (LED) light irradiation. The property of the catalysts was systematically characterized by scanning electron microscopy (SEM)/high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV/vis methods. The effects of parameters of solution pH, potassium peroxymonosulfate (PMS) concentration, catalyst dosage, and catalyst reusability on Rhodamine B (RhB) degradation were investigated. In the interface reaction, the improved photodegradation efficiency could be attributed to the decomposition of PMS, which produced sulfate radicals and hydroxyl radicals owing to the transmission of photo-generated electron/hole pairs. Herein, the introduction of surface oxygen vacancy as well as the cycling of copper valence states (Cu(II)/Cu(I) pairs) can facilitate the production of free reactive radicals, leading to the high degradation efficiency. The catalyst showed high removal efficiency and presented good cycle stability in the reaction. Additionally, the free radical quencher experiment and electron spin resonance (EPR) experiments were conducted, and a proposed photocatalytic mechanism was also illustrated.

show abstract

Degradation of bisphenol A by peroxymonosulfate activated with oxygen vacancy modified nano-NiO-ZnO composite oxides: A typical surface-bound radical system

Cited by 138 publications

References 75 publications

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O₂) in the Fe–Co LDH/Peroxymonosulfate System

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O₂) in the Fe–Co LDH/Peroxymonosulfate System

Accelerated Proton Transport Based on a p-i-n Heterostructure Membrane for Low-Temperature Solid Oxide Fuel Cells

Visible Light Driven Spherical CuBi2O4 with Surface Oxygen Vacancy Enhanced Photocatalytic Activity: Catalyst Fabrication, Performance, and Reaction Mechanism

Contact Info

Product

Resources

About

Degradation of bisphenol A by peroxymonosulfate activated with oxygen vacancy modified nano-NiO-ZnO composite oxides: A typical surface-bound radical system

Cited by 138 publications

References 75 publications

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O2) in the Fe–Co LDH/Peroxymonosulfate System

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O2) in the Fe–Co LDH/Peroxymonosulfate System

Accelerated Proton Transport Based on a p-i-n Heterostructure Membrane for Low-Temperature Solid Oxide Fuel Cells

Visible Light Driven Spherical CuBi2O4 with Surface Oxygen Vacancy Enhanced Photocatalytic Activity: Catalyst Fabrication, Performance, and Reaction Mechanism

Contact Info

Product

Resources

About

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O₂) in the Fe–Co LDH/Peroxymonosulfate System

Oxygen Vacancy-Induced Nonradical Degradation of Organics: Critical Trigger of Oxygen (O₂) in the Fe–Co LDH/Peroxymonosulfate System