A novel Z-scheme CeO2/g-C3N4 heterojunction photocatalyst for degradation of Bisphenol A and hydrogen evolution and insight of the photocatalysis mechanism

Zhao, Wei; She, Tiantian; Zhang, Jingyi; Wang, Guoxiang; Zhang, Sujuan; Wei, Wei; Yang, Gang; Zhang, Lili; Xia, Dehua; Cheng, Zhipeng; Huang, Haibao; Leung, Dennis Y.C.

doi:10.1016/j.jmst.2020.12.064

Cited by 91 publications

(22 citation statements)

References 55 publications

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“…Glucose and acrylamide were used as templates during the hydrothermal process, and the precursor obtained by hydrothermal process was first calcined at 600 °C for 6 h in an Ar atmosphere, and then calcined at 500 °C for 4 h in air. Moreover, Zhao et al [ 23 ] synthesized mesoporous CeO 2 nanospheres ( S BET = 77.8 m 2 /g) using the C-sphere template. The C-sphere@CeO 2 precursor was first obtained by impregnation, combining the precipitation method with the prefabricated C-sphere as a template, and then 3D hollow mesoporous CeO 2 nanospheres were obtained by calcining C-sphere@CeO 2 precursor at 550 °C for 2 h. Although their template method could synthesize mesoporous CeO 2 , the soft or hard templates were essential, and thus either the procedure of dissolution or calcination was required to eliminate the soft or hard templates, but the energy consumption and costs were increased.…”

Section: Introductionmentioning

confidence: 99%

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Ding

2022

Materials

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Hydrogen peroxide (H2O2), an accessible and eco-friendly oxidant, was employed for the template-free hydrothermal synthesis of mesoporous CeO2 based on a cerium carbonate precursor (Ce2(CO3)3•xH2O). Its microstructure and physicochemical properties were characterized by XRD, TEM and N2 sorption techniques. The formation of the CeO2 phase with a porous structure was strongly dependent on the presence of H2O2, while the values of the BET surface area, pore diameter and pore volume of CeO2 were generally related to the amount of H2O2 in the template-free hydrothermal synthesis. The BET surface area and pore volume of the mesoporous CeO2 synthesized hydrothermally at 180 °C with 10 mL H2O2 were 112.8 m2/g and 0.1436 cm3/g, respectively. The adsorption process had basically finished within 30 min, and the maximum adsorption efficiency within 30 min was 99.8% for the mesoporous CeO2 synthesized hydrothermally at 140 °C with 10 mL, when the initial AO7 concentration was 120 mg/L without pH preadjustment. The experimental data of AO7 adsorption were analyzed using the Langmuir and Freundlich isotherm modes. Moreover, the mesoporous CeO2 synthesized at 140 °C with 10 mL H2O2 was regenerated in successive adsorption–desorption cycles eight times without significant loss in adsorption capacity, suggesting that the as-synthesized mesoporous CeO2 in this work was suitable as an adsorbent for the efficient adsorption of AO7 dye from an aqueous solution.

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Section: Introductionmentioning

confidence: 99%

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Ding

2022

Materials

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“…In the case of pristine CeO 2 , three peaks located at the binding energies of 881.99, 889.13, and 898.26 eV are referred to the 3d 5/2 spin orbit components of Ce 4+ and those at 901.41, 907.69, and 916.43 eV can be assigned to the 3d 3/2 spin-orbit coupling of Ce 4+ . 61 Furthermore, two peaks positioned at 885.73 and 903.65 eV are attributed to 3d 5/2 , verifying that the Ce 3+ chemical state also exists in the CeO 2 composition. 62 The positions of these peaks were shifted to higher binding energies for the CWC-40 sample, which further indicates the formation of a heterojunction at the interface of CdWO 4 nanorods and CeO 2 QDOTs.…”

Section: Xpsmentioning

confidence: 78%

Rational Construction of a 0D/1D S-Scheme CeO₂/CdWO₄ Heterojunction for Photocatalytic CO₂ Reduction and H₂ Production

Bahadoran

Ramakrishna

Masudy‐Panah

et al. 2022

Ind. Eng. Chem. Res.

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In this work, CeO 2 quantum dots were anchored on the surface of oxygen defected CdWO 4 nanorods through a simple precipitation procedure to construct an efficient S-scheme heterojunction. The as-fabricated pristine and hybrid photocatalysts were thoroughly characterized by XRD, BET, SEM, HRTEM, and XPS analyses and applied for the photoreduction of CO 2 and photocatalytic hydrogen evolution under simulated sunlight irradiation. The results revealed that CH 4 and CO were the major products and CH 3 OH was detected as the side product from the photoreduction of CO 2 . The photoreduction yield of the heterojunction was substantially improved with the addition of CeO 2 as compared to the pure samples, and the heterojunction containing 40 mol % CeO 2 showed the highest efficiency. This improvement could be mainly ascribed to the higher reduction potential of the separated electrons and exceptional mobility of charge carriers. Additionally, the adsorption of CO 2 and hydroxyl groups was increased due to the increased density of oxygen vacancy sites at the interfacial contacts acting as trapping centers for photoexcited electrons. Based on the experimental and theoretical results, S-scheme charge transfer was proposed for the fabricated CdWO 4 -CeO 2 heterojunction.

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“…As displayed in Figure a, the existence of C, N, O, Ni, and Fe could be expressly seen in the full scan spectra, revealing the entities of NiFe-LDH and g-C 3 N 4 in the as-prepared composite catalysts. The C 1s spectrum is deconvoluted into four primary peaks at 284.8, 286.0, 287.6, and 288.5 eV according to the Gaussian curve fitting, belonging to C–C, C–O, C–N, and O–CO bonds of the as-prepared samples, respectively (Figure b) . Moreover, the three main peaks (N 1s) at 399.2, 398.4, and 401.2 eV can be assigned to N–(C) 3 , C–NC, and N–H, respectively (Figure c) .…”

Section: Results and Discussionmentioning

confidence: 99%

NiFe-Layered Double Hydroxides as a Novel Hole Repository Layer for Reinforced Visible-Light Photocatalytic Activity for Degradation of Refractory Pollutants

Zhao

Long

et al. 2021

Ind. Eng. Chem. Res.

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Herein, reinforced functional catalysts, nickel-ironlayered double hydroxides/graphitic carbon nitride (NiFe-LDH/g-C 3 N 4 ) hybrid composites, were fabricated successfully by coupling NiFe-LDH with mesoporous g-C 3 N 4 microtubes spontaneously. Next, the as-prepared photocatalysts were evaluated and characterized by some advanced characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV−visible (vis) diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and photocurrent tests. Results demonstrated that NiFe-LDH can be identified as hole repository layers, which can distinctly decrease the recombination probabilities of photogenerated electron and hole pairs, thus increasing the degradation performance. It was discovered that 96.81% of tetracycline hydrochloride (TC) (20 mg/L) was removed within 60 min when the concentration of NiFe-LDH/g-C 3 N 4 was 0.4 g/L. Besides, NiFe-LDH/g-C 3 N 4 can almost completely degrade the pollutants methyl orange (MO) (95.71%) and rhodamine B (RhB) (96.26%). In addition, the cycle experiment proved that NiFe-LDH/g-C 3 N 4 possessed extraordinary reusability and photodegradation stability. Finally, a possible photocatalytic reaction mechanism was discussed, and this work would offer some insights into the design of related visible-light-induced catalysts for removal of various stubborn pollutants.

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A novel Z-scheme CeO2/g-C3N4 heterojunction photocatalyst for degradation of Bisphenol A and hydrogen evolution and insight of the photocatalysis mechanism

Cited by 91 publications

References 55 publications

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Rational Construction of a 0D/1D S-Scheme CeO₂/CdWO₄ Heterojunction for Photocatalytic CO₂ Reduction and H₂ Production

NiFe-Layered Double Hydroxides as a Novel Hole Repository Layer for Reinforced Visible-Light Photocatalytic Activity for Degradation of Refractory Pollutants

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A novel Z-scheme CeO2/g-C3N4 heterojunction photocatalyst for degradation of Bisphenol A and hydrogen evolution and insight of the photocatalysis mechanism

Cited by 91 publications

References 55 publications

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Rational Construction of a 0D/1D S-Scheme CeO2/CdWO4 Heterojunction for Photocatalytic CO2 Reduction and H2 Production

NiFe-Layered Double Hydroxides as a Novel Hole Repository Layer for Reinforced Visible-Light Photocatalytic Activity for Degradation of Refractory Pollutants

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Rational Construction of a 0D/1D S-Scheme CeO₂/CdWO₄ Heterojunction for Photocatalytic CO₂ Reduction and H₂ Production