研究目的
To develop and characterize cotton fabrics functionalized with a nanostructured TiO2-Ag-AgBr layer for enhanced solar photocatalytic degradation of dyes and toxic organophosphates, aiming at applications in chemical protective clothing.
研究成果
The functionalized cotton fabrics exhibit strong photocatalytic activity under visible light, effectively degrading dyes and toxic organophosphates. The method ensures good binding of the nanostructured layer to cotton, enabling potential reuse. This approach holds promise for developing self-detoxifying materials for chemical protection.
研究不足
The study is limited to specific pollutants (RB and DMMP) and conditions; scalability and long-term stability in real-world applications may require further investigation. The photocatalytic activity decreased slightly after multiple cycles due to by-product accumulation.
1：Experimental Design and Method Selection:
A non-aqueous sol-gel route and aqueous suspension method were used to functionalize cotton with TiO2-Ag-AgBr, followed by hydrothermal treatment. Characterization techniques included Raman, XRD, XPS, SEM, TGA, GSDR, and luminescence studies. Photocatalytic activity was assessed under visible light using a xenon lamp and halogen lamp.
2：Sample Selection and Data Sources:
Cotton gauze bandages (cellulose content >99%) were used. Dyes (Remazol Brilliant Blue) and DMMP (dimethyl methylphosphonate) served as model pollutants.
3：List of Experimental Equipment and Materials:
Instruments included Raman micro-spectrograph (LabRAM, Jobin-Yvon), FE-SEM (ZEISS SUPRA40), TGA (Perkin Elmer TGA 400), XPS (KRATOS XSAM800), XRD (PANalytical Empyrean), UV-Vis spectrophotometer (Perkin-Elmer Lambda 35), LC-HRMS (Orbitrap Mass Spectrometer), and various chemicals from Sigma-Aldrich.
4：Experimental Procedures and Operational Workflow:
Cotton was treated with Ti(OBu)4 solution, immersed in AgBr suspension, and hydrothermally treated. Photocatalytic tests involved irradiating samples with pollutant solutions and monitoring degradation over time.
5：Data Analysis Methods:
Data were analyzed using first-order kinetics for degradation rates, XPSPEAK software for XPS data fitting, and standard spectroscopic and chromatographic methods.
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FE-SEM microscope
ZEISS SUPRA40
ZEISS
Obtaining field-emission scanning electron microscopy images
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TGA analyzer
TGA 400
Perkin Elmer
Performing thermogravimetric analysis to assess thermal stability and composition
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XPS spectrometer
KRATOS XSAM800
KRATOS
Conducting X-ray photoelectron spectroscopy analysis
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XRD diffractometer
PANalytical Empyrean
PANalytical
Recording X-ray powder diffraction patterns
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UV-Vis spectrophotometer
Lambda 35
Perkin-Elmer
Monitoring concentration of dyes via absorption measurements
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Raman micro-spectrograph
LabRAM
Jobin-Yvon, Horiba group
Recording Raman spectra for characterization of materials
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LC-HRMS system
Orbitrap Mass Spectrometer
Measuring concentration of extracted solutions for DMMP degradation studies
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Autoclave
Performing hydrothermal treatment at 150 °C
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Xenon lamp
Irradiating samples for photocatalytic studies
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Halogen lamp
Irradiating samples for photocatalytic studies under visible light
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Ultrasonic bath
Sonorex
Extracting samples and testing binding of nanostructured layer
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