Visible-light-driven removal of atrazine by durable hollow core-shell TiO2@LaFeO3 heterojunction coupling with peroxymonosulfate via enhanced electron-transfer

Wei, Kexin; Armutlulu, Andaç; Wang, Yinxu; Yao, Gang; Xie, Ruzhen; Lai, Bo

doi:10.1016/j.apcatb.2021.120889

Cited by 100 publications

(14 citation statements)

References 73 publications

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“…Figure 1 shows the XRD patterns of pure Bi 2 O 3 , pure TiO 2 , and Bi 2 O 3 /TiO 2 photocatalysts with different molar ratios of Bi. For the pure TiO 2 , the diffraction peaks are at 25.3°, 37.8°, 48.1°, 53.9°, and 62.7°, coinciding with (101), (004), (200), (105), and (204) of the anatase TiO 2 (JCPDS No.21-1272) [ 37 ]. For pure Bi 2 O 3 , the diffraction peaks are corresponding to β-Bi 2 O 3 [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Nano-Flower β-Bi2O3/TiO2 Heterojunction as Photocatalyst for Degradation RhB

et al. 2023

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Photocatalysis is a hopeful technology to solve various environmental problems, but it is still a technical task to produce large-scale photocatalysts in a simple and sustainable way. Here, nano-flower β-Bi2O3/TiO2 composites were prepared via a facile solvothermal method, and the photocatalytic performances of β-Bi2O3/TiO2 composites with different Bi/Ti molar ratios were studied. The nano-flower Bi2O3/TiO2 composites were studied by SEM, XRD, XPS, BET, and PL. The PL result proved that the construction of staggered heterojunction enhanced the separation efficiency of carriers. The degradation RhB was applied to study the photocatalytic performances of prepared materials. The results showed that the degradation efficiency of RhB increased from 61.2% to 99.6% when the molar ratio of Bi/Ti was 2.1%. It is a mesoporous approach to enhance photocatalytic properties by forming heterojunction in Bi2O3/TiO2 composites, which increases the separation efficiency of the generated carriers and improves photocatalytic properties. The photoactivity of the Bi2O3/TiO2 has no evident changes after the fifth recovery, indicating that the Bi2O3/TiO2 composite has distinguished stability.

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Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Nano-Flower β-Bi2O3/TiO2 Heterojunction as Photocatalyst for Degradation RhB

et al. 2023

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“…[30] Additionally, the presence of HCO 3 − significantly hindered phenol degradation, possibly due to the free‐radical quenching reaction between HCO 3 − and ROS generating HCO 3 ⋅ − (1.7 V) with a lower oxidation potential (Equations 10 and 11). [12c] …”

Section: Resultsmentioning

confidence: 99%

Peroxymonosulfate‐Assisted Phenol Degradation via a Magnetic Covalent‐Triazine‐Framework‐Based Photocatalyst

Wang

Cui

et al. 2023

ChemCatChem

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The development of efficient heterostructures combining covalent organic frameworks (COFs) and ideal semiconductors can significantly improve photocatalytic performance for pollutant degradation. Herein, we present the design, synthesis, and characterization of a core‐shell‐structured nanocomposite comprising covalent triazine framework‐encased Fe3O4 magnetic particles employed as a heterojunction photocatalyst for activating peroxymonosulfate (PMS) in phenol degradation. The distinctive internal structure between the TpMa shell (Tp=2,4,6‐trihydroxy‐1,3,5‐benzenetricarboxaldehyde, Ma=melamine) and the Fe3O4 core (Fe3O4@TpMa) facilitated charge transfer and accelerated charge separation. Furthermore, PMS served as an electron acceptor, enhancing photogenerated charge separation and maximizing the production of reactive oxygen species. The Fe3O4@TpMa/PMS system demonstrated remarkable photocatalytic performance and stability, achieving complete phenol degradation (10 mg L−1) in 40 min. The exceptional photocatalytic activity resulted from the synergistic effect of ⋅OH, SO4⋅−, O2⋅−, 1O2, and h+ generated in the Fe3O4@TpMa/PMS system during the degradation process. Overall, this material offers excellent potential for solar‐driven pollutant degradation and enables the development of COF‐based materials for wastewater treatment applications.

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“…In Figure c, in the absence of H 2 O 2 , Fe 2 O 3 , MXene, and β-FeOOH@MXene oxidize 0.9, 0.8, and 8.4% of NO 2 – , respectively, suggesting tiny little catalytic oxidation of NO 2 – with dissolved oxygen. Then, we used l -ascorbic acid ( l -AA), furfuryl alcohol (FFA, 98%), and tertbutyl alcohol (TBA, ≥99%) − to, respectively, quench • O 2 – , 1 O 2 ( k ( 1 O 2 , FFA) = 1.2 × 10 8 M –1 s –1 ), and HO • ( k (HO • , TBA) = 6.0–7.6 × 10 8 M –1 s –1 ) to determine their contributions to NO 2 – oxidation, with the molar ratio of H 2 O 2 to scavengers of 1:2. The results suggested that in the cases of Fe 2 O 3 and MXene, the NO 2 – oxidation efficiencies decreased to 0 as TBA was added, implying that HO • totally dominated NO 2 – oxidation.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Nitrite Resourcing and Mercury Ion Removal Using MXene-Anchored Goethite Heterogeneous Fenton Composite

Chen

Tong

Gao

et al. 2022

Environ. Sci. Technol.

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The integrated system of gas-phase advanced oxidation process combined with sulfite-based wet absorption process is a desirable method for simultaneous removal of SO2, NO, and Hg0, but due to the enrichment of nitrite and Hg2+, resourcing harmless wastewater is still a challenge. To tackle this problem, this study fabricated a bifunctional β-FeOOH@MXene heterogeneous Fenton material, of which the crystalline phase, morphology, structure, and composition were revealed by using X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy–energy dispersive x-ray spectroscopy, and transmission electron microscopy. It exhibits excellent performance on nitrite oxidation (99.5%) and Hg2+ removal (99.7%) and can maintain stable outstanding ability after 13 cycles, with superior Hg2+ adsorption capacity (395 mg/g) and ultralow Fe leaching loss (<0.018 wt %). The synergism between MXene and β-FeOOH appears as follows: (i) MXene, as an inductive agent, directionally converted Fe2O3 into β-FeOOH in the hydrothermal method and greatly reduced its monomer size; (ii) the introduced Ti(III)/Ti(II) accelerated the regeneration of Fe(II) via rapid electron transfer, thereby improving the heterogeneous Fenton reaction; and (iii) MXene strongly immobilized β-FeOOH to greatly inhibit Fe-leaching. HO•, •O2 ––, and 1O2 were the main radicals identified by electron spin resonance. Radical quenching tests showed their contributions to NO2 – oxidation in the descending order HO• > 1O2 > •O2 –. Quantum chemical calculations revealed that •OH-induced oxidation of NO2 – or HNO2 was the primary reaction path. Density functional theory calculations combined with X-ray photoelectron spectroscopy and Raman characterizations displayed the Hg2+ removal mechanism, with Hg2Cl2, HgCl2, and HgO as the main byproducts. This novel material provides a new strategy for resourcing harmless wastewater containing nitrite and Hg2+.

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Visible-light-driven removal of atrazine by durable hollow core-shell TiO2@LaFeO3 heterojunction coupling with peroxymonosulfate via enhanced electron-transfer

Cited by 100 publications

References 73 publications

Facile Synthesis of Nano-Flower β-Bi2O3/TiO2 Heterojunction as Photocatalyst for Degradation RhB

Facile Synthesis of Nano-Flower β-Bi2O3/TiO2 Heterojunction as Photocatalyst for Degradation RhB

Peroxymonosulfate‐Assisted Phenol Degradation via a Magnetic Covalent‐Triazine‐Framework‐Based Photocatalyst

Simultaneous Nitrite Resourcing and Mercury Ion Removal Using MXene-Anchored Goethite Heterogeneous Fenton Composite

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