研究目的
To construct a novel Zn2SnO4/C/AgBr nanocomposite with extended spectral response and improved photocatalytic performance for the degradation of organic pollutants like rhodamine B under visible light.
研究成果
The Zn2SnO4/C/AgBr heterostructured photocatalyst significantly enhances visible-light photocatalytic performance for RhB degradation due to improved light absorption and efficient charge separation mediated by carbon. The optimal AgBr loading is 3%, with a reaction constant 13 times higher than pure ZTO. This work provides insights for developing efficient visible-light photocatalysts for environmental remediation.
研究不足
The study may have limitations in scalability for industrial applications, potential photocorrosion of AgBr over time, and the need for further optimization of AgBr loading to avoid excessive amounts that reduce performance. The experiments were conducted under controlled lab conditions, which might not fully replicate real-world environments.
1：Experimental Design and Method Selection:
A two-step hydrothermal synthesis followed by chemical deposition was used to prepare the Zn2SnO4/C/AgBr heterostructure. The design aimed to enhance visible-light absorption and charge separation.
2：Sample Selection and Data Sources:
Reagents including zinc acetate dehydrate, tin chloride pentahydrate, sodium hydroxide, glucose, silver nitrate, potassium bromide, and rhodamine B were purchased from Sinopharm Chemical Reagent. Samples were prepared with varying AgBr loading amounts (0.5%, 1%, 3%, 5%).
3：5%, 1%, 3%, 5%). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included X-ray diffractometer (Bruker D8 Advance), Raman spectrometer (Renishaw invia), XPS spectrometer (Thermo ESCALAB 250Xi), FESEM (Hitachi Se4800), TEM (Philips Tecnai G20), BET analyzer (Quantachrome NOVA 2000e), UV-vis spectrophotometer (Puxi TU 1901), PL spectrophotometer (PE LS55), electrochemical workstation (CHI660E), and daylight lamps for photocatalytic experiments.
4：Experimental Procedures and Operational Workflow:
ZTO/C nanocrystals were synthesized hydrothermally, then AgBr was deposited via in situ precipitation. Photocatalytic tests involved degrading RhB under visible light, with samples taken at intervals for UV-vis analysis.
5：Data Analysis Methods:
XRD, Raman, XPS, SEM, TEM, BET, UV-vis DRS, PL spectra, photocurrent measurements, and kinetic analysis using Langmuir-Hinshelwood model were employed to characterize and evaluate performance.
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X-ray diffractometer
D8 Advance
Bruker
Used to gather X-ray diffraction patterns for crystal phase analysis.
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X-ray photoelectron spectrometer
ESCALAB 250Xi
Thermo
Used to record XPS spectra for surface component analysis.
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Field emission scanning electron microscope
Se4800
Hitachi
Used for morphological and structural analysis.
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Fluorescence spectrophotometer
LS55
PE
Used to record photoluminescence spectra.
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Electrochemical workstation
CHI660E
CH Instruments
Used for photocurrent tests in a three-electrode system.
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Raman spectrometer
invia
Renishaw
Used to obtain Raman spectra for material characterization.
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Transmission electron microscope
Tecnai G20
Philips
Used for high-resolution imaging and structural analysis.
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Sorption analyzer
NOVA 2000e
Quantachrome
Used for BET surface area measurement.
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UV-vis spectrophotometer
TU 1901
Puxi
Used for UV-vis diffuse reflectance spectra and absorbance measurements.
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Daylight lamp
Used as light source for photocatalytic experiments.
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