Optimizing electron structure of Zn-doped AgFeO2 with abundant oxygen vacancies to boost photocatalytic activity for Cr(VI) reduction and organic pollutants decomposition: DFT insights and experimental

Li, Chenxi; Guo, Yihang; Tang, Dandan; Guo, Yaoping; Wang, Guanghui; Jiang, Hao; Li, Jun

doi:10.1016/j.cej.2021.128515

Cited by 44 publications

(17 citation statements)

References 52 publications

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“…Interestingly, the content of adsorbed oxygen (O A ) increases gradually from 6.35% (Ti0.95) to 8.18% (Ti1.05), which may be related to the difference in the atomic ratio among samples. Moreover, it has been reported that the content of adsorbed oxygen (O A ) indirectly reflects the concentration of oxygen vacancies (OVs) . In other words, more OVs are generated in Ti1.05, which is attributed to the negative Ti 4+ accepter-type dopant being compensated by the generation of OVs.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Moreover, it has been reported that the content of adsorbed oxygen (O A ) indirectly reflects the concentration of oxygen vacancies (OVs). 41 In other words, more OVs are generated in Ti1.05, which is attributed to the negative Ti 4+ accepter-type dopant being compensated by the generation of OVs. The generation of OVs in the Ti1.05 sample was further verified by the EPR technique.…”

Section: Structure and Morphology Characterizationsmentioning

confidence: 99%

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Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Cui

Guo

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Constructing facet junction in semiconductor photocatalysts has been demonstrated as an effective method to promote charge-carrier separation and suppress carrier recombination. Herein, we proposed a novel but facile self-doping strategy to regulate the crystal facet exposure ratio in ferroelectric Bi3Ti x Nb2–x O9 single-crystalline nanosheets, thereby optimizing its facet junction effect. Through tuning the atomic ratio of Ti and Nb, the exposure ratio of {001} and {110} crystal planes in Bi3Ti x Nb2–x O9 nanosheets can be delicately modulated, and more {110} facets were exposed with the increase of the Ti/Nb atomic ratio as evidenced by the X-ray diffraction and scanning electron microscopy results. A facet junction between {110} and {001} crystal planes was verified based on the density functional theory calculation and photodeposition experiment results. Photogenerated electrons tend to accumulate in {110}, while holes gathered in {001} crystal planes. Owing to the optimal facet junction effect, the sample of Ti1.05 shows the most efficient charge-carrier separation and transportation compared to Ti0.95 and Ti1.00 as supported by the photoluminescence, surface photovoltage, photoelectrochemistry, and electron paramagnetic resonance (EPR) results. In addition, the oxygen vacancy arising from the inequivalent substitution of Nb5+ by Ti4+ as proved by X-ray photoelectron spectroscopy and EPR results and the enhanced ferroelectricity supported by P–E loops can also assist charge-carrier separation and migration. Benefiting from these properties, Ti1.05 outperformed Ti0.95 and Ti1.00 in the photodegradation of organic dye and antibiotic molecules. Meanwhile, the excellent antibacterial activity of Ti1.05 under visible light was also demonstrated by the Escherichia coli sterilization experiment. This work not only presents a novel pathway to adjust the facet junction but also provides new deep insights into the crystal facet engineering in ferroelectrics as photocatalysts.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Structure and Morphology Characterizationsmentioning

confidence: 99%

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Cui

Guo

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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“…Theoretically understanding the physicochemical properties of photocatalysts can be achieved by DFT, and thus to facilitate the optimization process. The DFT is not only indispensable to establish the electronic structure and the chemical property of photocatalysts, but also provides valuable guidance to understand the mechanisms involved in the photocatalytic reaction processes [45][46][47].…”

Section: Model Simulation Of Photo(electro)catalytic Reactionsmentioning

confidence: 99%

A Review of Electrical Assisted Photocatalytic Technologies for the Treatment of Multi-Phase Pollutants

Yuan

Zheng

et al. 2021

Catalysts

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This article reviews the fundamental theories and reaction mechanisms of photocatalytic technologies with the assistance of electrical field for degrading multi-phase pollutants. Photo(electro)catalysis including photocatalytic oxidation (PCO) and photoelectrocatalytic oxidation (PECO) have been a potential technologies applied for the treatment of organic and inorganic compounds in the wastewaters and waste gases, which has been treated as a promising technique by using semiconductors as photo(electro)catalysts to convert light or electrical energy to chemical energy. Combining photocatalytic processes with electrical field is an option to effectively decompose organic and inorganic pollutants. Although photocatalytic oxidation techniques have been used to decompose multi-phase pollutants, developing efficient advanced oxidation technologies (AOTs) by combining photocatalysis with electrical potential is urgently demanded in the future. This article reviews the most recent progress and the advances in the field of photocatalytic technologies combined with external electrical field, including the characterization of nano-sized photo(electro)catalysts, the degradation of multi-phase pollutants, and the development of electrical assisted photocatalytic technologies for the potential application on the treatment of organic and inorganic compounds in the wastewaters and waste gases. Innovative oxidation techniques regarding photo(electro)catalytic reactions with and without oxidants are included in this review article.

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“…Therefore, it is critical to efficiently cleanse Cr(VI)-containing water. Many methods have been exploited for Cr(VI)-containing wastewater purification (Ganji et al, 2020;Li et al, 2021;Xiao et al, 2016;Zeng et al, 2021) . Among the strategies listed above, adsorption has been identified as a viable method for soluble pollutant separation because of its benefits, which include cheap cost, easy operation, and efficacy (Chatterjee et al, 2010;Song et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Many methods have been exploited for Cr(VI)-containing wastewater purification. [20][21][22][23][24][25][26][27][28][29][30][31] Adsorption has been selected as a suitable approach for soluble pollutant separation among the strategies outlined above due to its merits, which include low cost, ease of operation, and effectiveness. 32,33 Adsorbents that are both cheap and efficient are required for the adsorption method.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ce/ferroferric oxide/food waste‐derived biochar for aqueous Cr(VI) adsorption

Tie

Zhang

Shen³

et al. 2022

J of Chemical Tech & Biotech

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Hexavalent chromium Cr(VI) causes serious damage to human health. In this study, food waste (FW) was used as raw material to prepare the food waste-derived biochar (FWB), which was further modified using Ce and Fe 2+ /Fe 3+ co-precipitation to obtain Ce dopped magnetic waste-derived biochar (Ce/Fe3O4/FWB ) material for the efficient Cr(VI) adsorption. The morphology, structure, and characteristics of Ce/Fe3O4/FWB composite were thoroughly investigated, and its Cr(VI) uptake behavior was explored. Ce/Fe3O4/FWB showed the best Cr(VI) adsorption of 20.4 mg/g at pH 2.Additionally, the adsorption suited the pseudo-second-order kinetic equation and the Langmuir equation, and the intra-particle diffusion the main step limited the Cr(VI) adsorption by Ce/Fe3O4/FWB. The thermodynamic investigation discovered that the adsorption owned a spontaneous and endothermic nature. With increasing concentrations of Cl -, SO4 2and PO4 3-, the Cr(VI) uptake was weakened in the sequence of Cl -＜SO4 2-＜PO4 3-.Adsorbent preparation for Cr(VI) removal utilizing FW as a raw material is a sustainable and environmentally beneficial technology for FW reclamation and Cr(VI)-bearing wastewater treatment.

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Optimizing electron structure of Zn-doped AgFeO2 with abundant oxygen vacancies to boost photocatalytic activity for Cr(VI) reduction and organic pollutants decomposition: DFT insights and experimental

Cited by 44 publications

References 52 publications

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

A Review of Electrical Assisted Photocatalytic Technologies for the Treatment of Multi-Phase Pollutants

Preparation of Ce/ferroferric oxide/food waste‐derived biochar for aqueous Cr(VI) adsorption

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Optimizing electron structure of Zn-doped AgFeO2 with abundant oxygen vacancies to boost photocatalytic activity for Cr(VI) reduction and organic pollutants decomposition: DFT insights and experimental

Cited by 44 publications

References 52 publications

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi3TixNb2–xO9 Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi3TixNb2–xO9 Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

A Review of Electrical Assisted Photocatalytic Technologies for the Treatment of Multi-Phase Pollutants

Preparation of Ce/ferroferric oxide/food waste‐derived biochar for aqueous Cr(VI) adsorption

Contact Info

Product

Resources

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Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity

Self-Doping Based Facet Junctions and Oxygen Vacancies in Ferroelectric Bi₃Ti_xNb_2–xO₉ Nanosheets for Boosting Photocatalytic Degradation and Antibacterial Activity