研究目的
Investigating the preparation and photocatalytic performance of activated carbon nanotube foams loaded with Ag-doped TiO2 nanoparticles for the degradation of organic pollutants under UV and visible light.
研究成果
The aCFs@TiO2–5Ag composite exhibited extraordinary photocatalytic performance under UV and visible light toward UDMH, attributed to the high efficiency of charge separation and strong SPR effect derived from Ag dopant. The stable photocatalytic activity in the recycle process makes this foam-like photocatalyst system meaningful for reducing environmental pollution.
研究不足
The study acknowledges the deactivation of the photocatalyst after several cycles due to the loss and contamination of TiO2–5Ag during the stirring and photodegradation process.
1：Experimental Design and Method Selection:
The study employed a template synthesis and carbonization strategy to construct a foam-like photocatalyst composed of activated carbon nanotube foams and Ag-doped TiO2 nanoparticles.
2：Sample Selection and Data Sources:
Polyurethane (PU) foams were used as porous templates, and multi-walled CNTs functionalized with carboxyl were purchased for the preparation of the carbonaceous support.
3：List of Experimental Equipment and Materials:
Materials included PU foams, CNTs, phenolic resin, hexamethylenetetramine, tetrabutyl titanate, silver nitrate, and others. Equipment included SEM, TEM, XRD, UV-Vis spectrophotometer, and others.
4：Experimental Procedures and Operational Workflow:
The process involved the preparation of CFs, aCFs, TiO2–xAg sol, and aCFs@TiO2–xAg composites, followed by characterization and photocatalytic activity evaluation.
5：Data Analysis Methods:
The photocatalytic activities were evaluated by decomposing unsymmetrical dimethylhydrazine under UV and visible light irradiation, with the concentration measured according to GB/T 14376-93.
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Scanning electron microscopy
S4800-II
Hitachi
Used to observe the surface morphology of the samples.
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UV–Vis-NIR spectrophotometer
Cary 5000
Lambda
Used to collect UV–Vis-NIR spectra.
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UV–visible absorption spectrophotometer
Lambda 950
PerkinElmer
Used to collect UV–visible absorption spectra.
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Polyurethane foams
Beijing jujia Foam Ltd., Co.
Used as porous templates for the preparation of carbon nanotube foams.
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Multi-walled CNTs
Functionalized with carboxyl
Beijing deke Ltd., Co.
Used for the preparation of carbon nanotube foams.
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Phenolic resin
Sinopharm Chemical Reagent Ltd., Co.
Used in the carbonization process to stick CNTs on the PU foam templates.
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Tetrabutyl titanate
Sinopharm Chemical Reagent Ltd., Co.
Used in the synthesis of TiO2–xAg sol.
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Silver nitrate
Sinopharm Chemical Reagent Ltd., Co.
Used in the synthesis of TiO2–xAg sol for Ag doping.
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Bruker AXS D8 ADVANCE X-ray diffractometer
D8 ADVANCE
Bruker AXS
Used for powder X-ray diffraction (XRD) analysis.
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Transmission electron microscopy
G2 F30
Tecnai
Used to study the composition and structure of the samples.
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Brunauer–Emmett–Teller (BET) analyzer
3H-2000PS2
Bei Shi De
Used to calculate the specific surface area, pore volume, and pore diameter.
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Renishaw inVia Raman spectrometer
inVia
Renishaw
Used to record the Raman spectra of the samples.
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Thermogravimetric analyzer
PerkinElmer
Used to characterize the thermal stability of the samples.
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CHI 660E electrochemical workstation
660E
Shanghai Chenhua Instruments
Used for photocurrent experiments.
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Photodegradation device
YM-GHX-I
Shanghai YuMing YiQi Co. LTD
Used to evaluate the photocatalytic activities of aCFs@TiO2–xAg composites.
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