Superior photocatalytic performance of LaFeO3/g-C3N4 heterojunction nanocomposites under visible light irradiation

Xu, Ke; Feng, Jian

doi:10.1039/c7ra08715b

Cited by 94 publications

(34 citation statements)

References 37 publications

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“…Thus, some doubts regarding the H2 production reported in their papers exist. Xu et al [39] reported hydrogen production activity over a LaFeO3/g-C3N4 composite in the presence of TEOA as a sacrificial reagent and Pt as a co-catalyst. Their results show that LaFeO3 alone had no activity due to the positive conduction band edge (0.11 V); hydrogen was only found if g-C3N4 (conduction band potential at -0.85 V vs. NHE) was added, which is in agreement of our results.…”

Section: Structural and Optical Characterization Of Lafeomentioning

confidence: 99%

Perovskite-type LaFeO3: Photoelectrochemical Properties and Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation

2019

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Perovskite-type oxides lanthanum ferrite (LaFeO3) photocatalysts were successfully prepared by a facile and cost-effective sol-gel method using La(NO)3 and Fe(NO)3 as metal ion precursors and citric acid as a complexing agent at different calcination temperatures. The properties of the resulting LaFeO3 samples were characterized by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDXS), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (IR), transmission electron microscopy (TEM), N2 adsorption/desorption and photoelectrochemical tests. The photoactivity of the LaFeO3 samples was tested by monitoring the photocatalytic degradation of Rhodamine B (RhB) and 4-chlorophenol (4-CP) under visible light irradiation, the highest photocatalytic activity was found for LaFeO3 calcined at 700 °C, which attributed to the relatively highest surface area (10.6 m2/g). In addition, it was found from trapping experiments that the reactive species for degradation were superoxide radical ions (O2−) and holes (h+). Photocurrent measurements and electrochemical impedance spectroscopy (EIS) proved the higher photo-induced charge carrier transfer and separation efficiency of the LaFeO3 sample calcined at 700 °C compared to that that calcined at 900 °C. Band positions of LaFeO3 were estimated using the Mott-Schottky plots, which showed that H2 evolution was not likely.

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Section: Structural and Optical Characterization Of Lafeomentioning

confidence: 99%

Perovskite-type LaFeO3: Photoelectrochemical Properties and Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation

2019

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“…It was a promising photocatalysts with visible light response. Nowadays, LaFeO 3 /g-C 3 N 4 Z-scheme heterojunctions have been fabricated to promote the separation efficiency of photoinduced carriers and to enhance the photocatalytic activities [38]. The photocatalytic activities, including degradation performance and hydrogen evolution rate, of LaFeO 3 /g-C 3 N 4 heterojunctions were much higher than that of pure LaFeO 3 and g-C 3 N 4 under visible light irradiation [39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

Yang

Ruan

et al. 2020

Catalysts

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Mesoporous LaFeO3/g-C3N4 Z-scheme heterojunctions (LFC) were synthesized via the incorporation of LaFeO3 nanoparticles and porous g-C3N4 ultrathin nanosheets. The as prepared LFC were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, Raman spectra and N2 adsorption analysis. The structural analysis indicated that the reheating process and the addition of NH4Cl in the thermal polymerization were the key factors to get porous g-C3N4 ultrathin nanosheets and to obtain high specific surface areas of LFC. It remarkably enhanced the adsorption capacity and photocatalytic degradation of LFC for removal of oxytetracycline (OTC). The effect of the mass percentage of LaFeO3 in LFC, pH and temperature on the OTC adsorption was investigated. The LaFeO3/g-C3N4 heterojunction with 2 wt % LaFeO3 (2-LFC) exhibited highest saturated adsorption capacity (101.67 mg g−1) and largest photocatalytic degradation rate constant (1.35 L g−1 min−1), which was about 9 and 5 times higher than that of bulk g-C3N4 (CN), respectively. This work provided a facile method to prepare mesoporous LaFeO3/g-C3N4 heterojunctions with especially well adsorption and photocatalytic activities for OTC, which can facilitate its practical applications in pollution control.

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“…For the success of such articial photosynthesis systems, however, the major challenge is the development of efficient visible-light active photocatalysts. [10][11][12] Graphitic carbon nitride (g-C 3 N 4 ), a polymeric semiconductor with a band gap of about 2.7 eV, has attracted signicant attention in recent years because of its excellent visible light response, 1,13,14 non-toxicity, low cost, and abundant raw materials. As a visible-light active photocatalyst, g-C 3 N 4 has been widely applied for photocatalytic degradation of pollutants, water splitting, and regeneration of NADH since 2009.…”

Section: Introductionmentioning

confidence: 99%

WS₂/g-C₃N₄ composite as an efficient heterojunction photocatalyst for biocatalyzed artificial photosynthesis

Zeng

et al. 2018

RSC Adv.

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A heterogeneous WS 2 /g-C 3 N 4 composite photocatalyst was prepared by a facile ultrasound-assisted hydrothermal method. The WS 2 /g-C 3 N 4 composite was used for photocatalytic regeneration of NAD + to NADH, which were coupled with dehydrogenases for sustainable bioconversion of CO 2 to methanol under visible light irradiation. Compared with pristine g-C 3 N 4 and the physical mixture of WS 2 and g-C 3 N 4 , the fabricated WS 2 /g-C 3 N 4 composite catalyst with 5 wt% of WS 2 showed the highest activity for methanol synthesis. The methanol productivity reached 372.1 mmol h À1 g cat À1 , which is approximately 7.5 times higher than that obtained using pure g-C 3 N 4 . For further application demonstration, the activity of the WS 2 /g-C 3 N 4 composite catalyst toward photodegradation of Rhodamine B (RhB) was evaluated. RhB removal ratio approaching 100% was achieved in 1 hour by using the WS 2 /g-C 3 N 4 composite catalyst with 5 wt% of WS 2 , at an apparent degradation rate approximately 2.6 times higher than that of pure g-C 3 N 4 . Based on detailed investigations on physiochemical properties of the photocatalysts, the significantly enhanced reaction efficiency of the WS 2 /g-C 3 N 4 composite was considered to be mainly benefiting from the formation of a heterojunction interface between WS 2 and g-C 3 N 4 . Upon visible-light irradiation, the photo-induced electrons can transfer from the conduction band of g-C 3 N 4 to WS 2 , thus recombination of electrons and holes was decreased and the photo-harvesting efficiency was enhanced. Fig. 8 (a) Photocatalytic degradation profiles of RhB under visible light irradiation in the presence of ( ) g-C 3 N 4 , ( ) WS 2 , ( ) PM-WS 2 /g-C 3 N 4 , ( ) 1 wt% WS 2 /g-C 3 N 4, ( ) 5 wt% WS 2 /g-C 3 N 4 , and (-) 10 wt% WS 2 /g-C 3 N 4 composite; (b) the comparison chart of RhB degradation rate after 1 h's irradiation catalyzed by various catalysts; (c) effects of different scavengers on degradation of RhB in the presence of 5 wt% WS 2 /g-C 3 N 4 composite catalyst under visible-light irradiation; and (d) reusability of the 5 wt% WS 2 /g-C 3 N 4 composite catalyst for five successive runs (each run was lasted for 60 min).

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Superior photocatalytic performance of LaFeO₃/g-C₃N₄ heterojunction nanocomposites under visible light irradiation

Cited by 94 publications

References 37 publications

Perovskite-type LaFeO3: Photoelectrochemical Properties and Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation

Perovskite-type LaFeO3: Photoelectrochemical Properties and Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation

Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

WS₂/g-C₃N₄ composite as an efficient heterojunction photocatalyst for biocatalyzed artificial photosynthesis

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Superior photocatalytic performance of LaFeO3/g-C3N4 heterojunction nanocomposites under visible light irradiation

Cited by 94 publications

References 37 publications

Perovskite-type LaFeO3: Photoelectrochemical Properties and Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation

Perovskite-type LaFeO3: Photoelectrochemical Properties and Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation

Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

WS2/g-C3N4 composite as an efficient heterojunction photocatalyst for biocatalyzed artificial photosynthesis

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Superior photocatalytic performance of LaFeO₃/g-C₃N₄ heterojunction nanocomposites under visible light irradiation

WS₂/g-C₃N₄ composite as an efficient heterojunction photocatalyst for biocatalyzed artificial photosynthesis