Heterogeneous activation of persulfate for Rhodamine B degradation with 3D flower sphere-like BiOI/Fe3O4 microspheres under visible light irradiation

Liu, Yang; Guo, Hongguang; Zhang, Yongli; Cheng, Xiaonong; Zhou, Peng; Zhang, Gucheng; Wang, Jingquan; Tang, Peng; Ke, Tingling; Li, Wei

doi:10.1016/j.seppur.2017.09.045

Cited by 155 publications

(26 citation statements)

References 62 publications

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“…It was worth mentioning that the adventitious C element might be ascribed to the XPS instrument . As indicated in Figure B, the high resolution XPS spectrum of Bi 4 f for BiOI presented two pronounced peaks centered at 159.1 and 164.4 eV, which could be attributed to the binding energies of Bi 4 f 7/2 and Bi 4 f 5/2 , respectively . Simultaneously, the binding energy between these two peaks was 5.3 eV, suggesting the presence of Bi 3+ in BiOI .…”

Section: Resultsmentioning

confidence: 89%

“…22 As indicated in Figure 2B, the high resolution XPS spectrum of Bi 4f for BiOI presented two pronounced peaks centered at 159.1 and 164.4 eV, which could be attributed to the binding energies of Bi 4f 7/2 and Bi 4f 5/2 , respectively. 36,37 Simultaneously, the binding energy between these two peaks was 5.3 eV, suggesting the presence of Bi 3+ in BiOI. 38 Form Figure 2C, the binding energies at 619.0 and 630.5 eV in the high resolution XPS of I 3d spectrum for BiOI could be associated to I 3d 5/2 and I 3d 3/2 , respectively, verifying that the existence of I − in BiOI.…”

Section: Characterization Of Photocatalystsmentioning

confidence: 85%

“…38 Form Figure 2C, the binding energies at 619.0 and 630.5 eV in the high resolution XPS of I 3d spectrum for BiOI could be associated to I 3d 5/2 and I 3d 3/2 , respectively, verifying that the existence of I − in BiOI. 22,26 In Figure 2D, the high resolution XPS spectrum of O 1s for BiOI could be deconvoluted into two strong peaks centred at 529.9 and 531.2 eV, which were ascribed to the Bi-O and I-O bonds of BiOI, 36 respectively. Interestingly, the binding energies of Bi 4f 7/2 and Bi 4f 5/2 for LaCoO 3 (4.0 wt%)/BiOI were respectively shifted to the higher position at 159.3 and 164.6 eV in comparison with those of pure BiOI.…”

Section: Characterization Of Photocatalystsmentioning

confidence: 99%

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LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

Yao

Zheng

et al. 2019

J Am Ceram Soc

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Exploring noble‐metal‐free co‐catalysts highly flexible for separating the photogenerated charge carriers is of prime importance for the visible‐light‐driven photocatalysis. Herein, three‐dimensional flower‐like BiOI microspheres were fabricated and applied to support noble‐metal‐free LaCoO3 co‐catalysts to construct a unique LaCoO3/BiOI hybrid photocatalyst with a higher ability in charge separation. As expected, the optimum tetracycline degradation rate of LaCoO3 (4.0 wt%)/BiOI was up to 0.0161 min−1, which was nearly 3.4 fold larger than that of pure BiOI (0.0048 min−1). The enhanced photocatalytic performance was mainly ascribed to the vital role of LaCoO3 co‐catalyst, which acted as an excellent electron collector for capturing the electrons generated by BiOI, effectively promoting the separation of photogenerated charge carriers and prolonging the lifetime of photo‐induced electron‐hole pairs at the same time. Furthermore, the active species trapping experiments revealed that the excellent photocatalytic activity was primarily driven by photogenerated holes and superoxide radicals. This work is expected to provide a new inspiration for rationally designing and fabricating noble‐metal‐free co‐catalyst system with high efficiency applied in environment purification.

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Section: Resultsmentioning

confidence: 89%

Section: Characterization Of Photocatalystsmentioning

confidence: 85%

Section: Characterization Of Photocatalystsmentioning

confidence: 99%

See 1 more Smart Citation

LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

Yao

Zheng

et al. 2019

J Am Ceram Soc

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“…According to previous publications 47,48 , the possible photocatalytic degradation of RhB included four main steps: N-deethylation, chromophore cleavage, opening ring and mineralization 49 . The dominating peaks in gas chromatographs of RhB degradation residues were at the retention time of 18.94 min and 3.239 min, respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

A novel Strategy of Lock-in Effect between Conjugated Polymer and TiO2 towards Dramatic Enhancement of Photocatalytic Activity under Visible Light

Liu

Jiang

Song

et al. 2020

Sci Rep

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to design novel conjugated polymers and improve interfacial interaction with semiconductor is one of directions to develop high-efficient photocatalysts with harvesting photons and boosting catalytic activities. Herein, two novel linear conjugated polymers poly[(thiophene-ethylene-thiophene)thiophene] (PTET-T) and poly[(thiophene-ethylene-thiophene)-thiophene-3-carboxylic acid] (PTET-T-COOH)were successfully synthesized by a simple Stille coupling reaction. Their heterojunction with tio 2 , i.e, PTET-T/TiO 2 (C1) and PTET-T-COOH/TiO 2 (C2), exhibited outstanding photocatalytic activity for degrading Rhodamine B, methylene blue and tetracycline. The energetic "lock-in effect" between ptet-t-cooH and tio 2 through carboxyl groups and hydroxyl groups interaction has been proved to greatly improve the interface charge transfer ability and suppress the electron-hole recombination in PTET-T-COOH/TiO 2 . Thus, by regulating the dosage of polymers, the 15% PTET-T-COOH/TiO 2 showed the optimized photocatalytic activity with excellent chemical stability, and its kinetic rate constant was determined to be 41.7 times of that of TiO 2 . This work provided a new effective strategy of designed and explored organic semiconductor-inorganic heterojunction photocatalysts with broaden absorption, repeatability and high-charge mobility.environmental governance thanks to their easy to synthesize, long-time stability, high carrier migration efficiency, and controllable narrow band gap. The polythiophene/TiO 2 composites had attracted widespread attention for degradation of various dye [25][26][27][28] , which have been shown to effectively lower the band gap by allowing greater adsorption in the visible region and prevent the recombination of photoelectrons and holes. PTh can be coated on the surface of metal oxides, act easily as a sensitizer to metal oxides 29 . However, the poor stability for long term application was not mentioned in above experiments, or the decolorization rate of organic pollutants was only about 60% after three repetitions. Meanwhile, the wavelength of the conjugated polymer optical response used in the above study is almost below 600 nm, which cannot be effectively utilized in the visible band. Last but not least, the bonding way of polythiophene and TiO 2 heterojunction determines the photogenerated charge separation and transfer capacity. Thus, a wise strategy is necessary to be proposed to construct a novel polymer/TiO 2 composites with the better stability and more effective photocatalytic ability for pollutant removal 30 .The "lock-in effect" has been used for molecular conformation in organic semiconductors. It facilitates the intramolecular delocalization of π-electrons along the backbone, thus enhancing intramolecular charge transfer and reducing the band gap 31 . In our paper, we firstly use "lock-in effect" to open concepts to bridge gaps between the polymer and TiO 2 composites.Herein, we designed and synthesized two novel thiophene-based conjugated polymers poly [(thiophene-ethylene-thiophene)-thiop...

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“…In the next stage, non-selective HO• directly attacks the center carbon of these N-de-ethylated intermediates, leading to the cleavage of the conjugated xanthene structure [81]. The intermediates with m/z values of 340, 245, 230, and 223 were identified from this process [82][83][84][85]. After the chromophore cleavage process, the ring opening process occurs and forms smaller molecules.…”

Section: Hplc-ms Analysismentioning

confidence: 99%

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

et al. 2020

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The classic Fenton reaction, which is driven by iron species, has been widely explored for pollutant degradation, but is strictly limited to acidic conditions. In this work, a copper-based Fenton-like catalyst Cu/Al2O3/g-C3N4 was proposed that achieves high degradation efficiencies for Rhodamine B (Rh B) in a wide range of pH 4.9–11.0. The Cu/Al2O3 composite was first prepared via a hydrothermal method followed by a calcination process. The obtained Cu/Al2O3 composite was subsequently stabilized on graphitic carbon nitride (g-C3N4) by the formation of C−O−Cu bonds. The obtained composites were characterized through FT-IR, XRD, TEM, XPS, and N2 adsorption/desorption isotherms, and the immobilized Cu+ was proven to be active sites. The effects of Cu content, g-C3N4 content, H2O2 concentration, and pH on Rh B degradation were systematically investigated. The effect of the catalyst dose was confirmed with a specific reaction rate constant of (5.9 ± 0.07) × 10−9 m·s−1 and the activation energy was calculated to be 71.0 kJ/mol. In 100 min 96.4% of Rh B (initial concentration 20 mg/L, unadjusted pH (4.9)) was removed in the presence of 1 g/L of catalyst and 10 mM of H2O2 at 25 °C, with an observed reaction rate constant of 6.47 × 10−4 s−1. High degradation rates are achieved at neutral and alkaline conditions and a low copper leaching (0.55 mg/L) was observed even after four reaction cycles. Hydroxyl radical (HO·) was identified as the reactive oxygen species by using isopropanol as a radical scavenger and by ESR analysis. HPLC-MS revealed that the degradation of Rh B on Cu/Al2O3/CN composite involves N-de-ethylation, hydroxylation, de-carboxylation, chromophore cleavage, ring opening, and the mineralization process. Based on the results above, a tentative mechanism for the catalytic performance of the Cu/Al2O3/g-C3N4 composite was proposed. In summary, the characteristics of high degradation rate constants, low ion leaching, and the excellent applicability in neutral and alkaline conditions prove the Cu/Al2O3/g-C3N4 composite to be a superior Fenton-like catalyst compared to many conventional ones.

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Heterogeneous activation of persulfate for Rhodamine B degradation with 3D flower sphere-like BiOI/Fe3O4 microspheres under visible light irradiation

Cited by 155 publications

References 62 publications

LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

A novel Strategy of Lock-in Effect between Conjugated Polymer and TiO2 towards Dramatic Enhancement of Photocatalytic Activity under Visible Light

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

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Heterogeneous activation of persulfate for Rhodamine B degradation with 3D flower sphere-like BiOI/Fe3O4 microspheres under visible light irradiation

Cited by 155 publications

References 62 publications

LaCoO3 acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

LaCoO3 acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

A novel Strategy of Lock-in Effect between Conjugated Polymer and TiO2 towards Dramatic Enhancement of Photocatalytic Activity under Visible Light

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

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LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI