研究目的
To design and synthesize hierarchically porous zinc oxide/graphitic carbon nitride (ZnO/g-C3N4) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency.
研究成果
The hierarchically porous ZnO/g-C3N4 spherical composites successfully form the type-II heterojunction between g-C3N4 and ZnO, enhancing charge separation and photocatalytic performance. The 1.5-ZnO/g-C3N4 sample shows the best photocatalytic performance in RhB degradation with good stability. The main active species for ZnO/g-C3N4 in RhB photodegradation are ?O2- and h+.
研究不足
The study focuses on the photocatalytic degradation of RhB and phenol, and the stability under simulated solar light irradiation. Potential areas for optimization include the scalability of the synthesis method and the efficiency under different light conditions.
1：Experimental Design and Method Selection:
The ZnO/g-C3N4 composite was synthesized via a two-step method involving thermal polymerization and solvothermal method.
2：Sample Selection and Data Sources:
Melamine, ethylene glycol, zinc acetate dihydrate, and other chemicals were used as received.
3：List of Experimental Equipment and Materials:
Equipment included a bruker diffractometer, Hitachi S-4800 field emission scanning electron microscope, FEI Talos F200S microscope, and others. Materials included melamine, ethylene glycol, zinc acetate dihydrate, etc.
4：Experimental Procedures and Operational Workflow:
g-C3N4 was prepared by thermal polymerization method, and ZnO/g-C3N4 was synthesized through solvothermal method.
5：Data Analysis Methods:
XRD, SEM, TEM, BET, XPS, UV–vis absorption spectra, PL spectra, and Mott-Schottky plots were used for characterization.
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Agilent 7890B-5977B
7890B-5977B
Agilent
Detect the degradation products
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Autolab 86005
86005
Autolab
Measure the Mott-Schottky plots
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Nano-ZS ZEN3600 zetasizer
ZEN3600
Nano-ZS
Determine the zeta potential of sample
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CH1660D
1660D
CH
Detect the photocurrent of the samples
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Hitachi S-4800 field emission scanning electron microscope
S-4800
Hitachi
Observe the morphologies of samples
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FEI Talos F200S microscope
Talos F200S
FEI
Perform TEM, HRTEM, HAADF-STEM and EDS
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Thermo Scientific Escalab 250Xi
Escalab 250Xi
Thermo Scientific
Study the surface chemical composition and valence states of products
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UV-2550 Shimadzu spectrophotometer
UV-2550
Shimadzu
Record room-temperature UV–vis absorption spectra of samples
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PerkinElmer Lambda LS 55 fluorescence spectrometer
Lambda LS 55
PerkinElmer
Record photoluminescence emission studies (PL)
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bruker diffractometer
Bruker
Measure powder X-ray diffraction (XRD) patterns
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Nicolet FTIR 6700
FTIR 6700
Nicolet
Detect Fourier transform infrared spectroscopy (FTIR)
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