研究目的
To develop novel photocatalysts with efficient visible-light absorption and excellent stability for the photocatalytic reduction of Cr(VI) to Cr(III) and degradation of diclofenac sodium under simulated sunlight irradiation.
研究成果
The MIL-100(Fe)/g-C3N4 hybrids, particularly MG-20%, demonstrated superior photocatalytic activity for Cr(VI) reduction and diclofenac sodium degradation under simulated sunlight irradiation, attributed to improved charge separation. The hybrids also showed good reusability and stability, indicating potential for environmental remediation applications.
研究不足
The study is limited by the specific conditions under which the photocatalytic activities were tested, such as pH range and the types of hole scavengers used. The practical application may require optimization under varying environmental conditions.
1：Experimental Design and Method Selection:
The study involved the synthesis of MIL-100(Fe)/g-C3N4 heterojunctions through ball-milling and annealing, followed by characterization using various techniques.
2：Sample Selection and Data Sources:
The samples included MIL-100(Fe), g-C3N4, and their hybrids (MG-x).
3：List of Experimental Equipment and Materials:
Equipment used included a ball mill, tube furnace, XRD, FTIR, TGA, TEM, UV-Vis DRS, PL, and XPS. Materials included urea, iron powder, benzene-1,3,5-tricarboxylic acid, and others.
4：Experimental Procedures and Operational Workflow:
The photocatalytic activities were tested under simulated sunlight irradiation, with variations in pH and the presence of hole scavengers.
5：Data Analysis Methods:
The photocatalytic performance was analyzed based on the reduction efficiency of Cr(VI) and degradation of diclofenac sodium, with kinetic studies and stability tests.
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urea
CH4N2O
Amresco
Precursor for g-C3N4 preparation
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iron powder
Fe
J&k Scientific Ltd.
Material for MIL-100(Fe) synthesis
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benzene-1,3,5-tricarboxylic acid
H3BTC
J&k Scientific Ltd.
Ligand for MIL-100(Fe) synthesis
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nitric acid
HNO3
Sinopharm Chemical Reagent Co., Ltd.
Used in MIL-100(Fe) synthesis
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hydrofluoric acid
HF
Sinopharm Chemical Reagent Co., Ltd.
Used in MIL-100(Fe) synthesis
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potassium dichromate
K2Cr2O7
Sinopharm Chemical Reagent Co., Ltd.
Source of Cr(VI) for photocatalytic reduction
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diclofenac sodium
C14H10Cl2NNaO2
J&k Scientific Ltd.
Organic pollutant for photocatalytic degradation
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hydrogen peroxide
H2O2
Sinopharm Chemical Reagent Co., Ltd.
Used in photocatalytic degradation experiments
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oxalic acid
H2C2O4
Sinopharm Chemical Reagent Co., Ltd.
Hole scavenger in photocatalytic experiments
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citric acid monohydrate
C6H8O7·H2O
J&k Scientific Ltd.
Hole scavenger in photocatalytic experiments
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sodium acetate
C2H3O2Na
Sinopharm Chemical Reagent Co., Ltd.
Used in mobile phase for UPLC analysis
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acetonitrile
C2H3N·H2O
J&k Scientific Ltd.
Used in mobile phase for UPLC analysis
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xenon lamp
300 W
Beijing Aulight Co. Ltd.
Light source for photocatalytic experiments
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UPLC system
Acquity UPLC H-Class
Waters
Detection of residual concentration of diclofenac sodium
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C18 column
1.7 μm, 2.1 mm × 50 mm
Separation column in UPLC system
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UV-vis spectrophotometer
Yuanxi UV-5200PC
Determination of Cr(VI) content
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ball mill
Used in the fabrication of MIL-100(Fe)/g-C3N4 hybrids
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tube furnace
Used in the thermal treatment of samples
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X-ray diffractometer
Dandong Haoyuan DX-2700B
Characterization of samples
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thermal analyzer
DTU-3c
Thermogravimetric analysis of samples
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