研究目的
Investigating the synthesis and photocatalytic properties of hybrid organic–inorganic composite layers for environmental applications, specifically the degradation of organic pollutants like methyl orange and chloramphenicol.
研究成果
The study demonstrated a simple, one-step laser-based method for the synthesis and deposition of multicomponent photoactive organic–inorganic layers with high photocatalytic activity. The layers efficiently degrade organic dye molecules and antibiotics, offering a promising material for environmental remediation. The technique avoids the use of additional chemical substances or high temperature annealing processes, presenting a fast and energy-efficient alternative to conventional materials synthesis methods.
研究不足
The technique's main limitation is related to the water dispersibility of the base materials during the MAPLE target preparation, which could be overcome by surface functionalization with more hydrophilic ligands.
1：Experimental Design and Method Selection
The study utilized a laser-based method called reactive matrix-assisted pulsed laser evaporation (reactive MAPLE) for the synthesis and deposition of multicomponent hybrid thin layers. This method allows for simultaneous chemical transformation and deposition of nanomaterials in form of thin films.
2：Sample Selection and Data Sources
Aqueous dispersions of semiconductor inorganic nanoparticles, commercial graphene oxide platelets, and organic urea molecules were used as starting materials. The photocatalytic properties were tested through the degradation of methyl orange organic dye and chloramphenicol.
3：List of Experimental Equipment and Materials
Anatase phase TiO2 NPs, GO platelets, urea powder, distilled water, (001) SiO2 quartz plates, Nd:YAG laser, FE-SEM system, TEM microscope, FTIR microspectroscopy, XPS spectrometer, UV–visible spectrophotometer.
4：Experimental Procedures and Operational Workflow
The solid targets were fixed in a double wall target holder and maintained frozen during the irradiations. The laser fluence at the target surface was fixed at 0.4 J/cm2. The layers were investigated by FE-SEM, TEM, HRTEM, STEM, EDX, FTIR, and XPS. Photocatalytic activity was studied by photodegradation tests of MO and chloramphenicol under UV light irradiation.
5：Data Analysis Methods
The data were analyzed with the aid of the SDP XPS software. The photocatalytic efficiency was calculated using the formula η [%] = (C0 - C) × 100/C0, where C0 is the initial concentration and C is the concentration measured during the degradation experiments.
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FTIR microspectroscopy system
Hyperion 3000 microscope coupled to Vertex 70 spectrometer
Bruker
Investigation of chemical bonds between elements
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UV–visible spectrophotometer
Shimadzu UV-2600
Shimadzu
Measurement of concentration changes in time of organic molecules
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Nd:YAG laser
Brilliant B
Quantel
Laser source for synthesis and deposition of composite layers
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FE-SEM system
QUANTA FEI 200 FEG-ESEM
FEI
Investigation of layers' morphology and chemical composition
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TEM microscope
FEI Tecnai G2 F20
FEI
Study of morphology and chemical composition
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XPS spectrometer
SPECS XPS spectrometer
SPECS Surface Nano Analysis GmbH
Investigation of chemical bonds
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Photoreactor
LZC-ICH2
Luzchem Research Inc
Photodegradation tests under UV light irradiation
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