研究目的
To synthesize a novel bi-functional yolk-shell SiO2@TiO2/CDs nanocomposite for use as both an efficient SERS substrate and photocatalyst, enhancing the detection of organic dyes like rhodamine 6G and the degradation of pollutants like dinitraphenols.
研究成果
The yolk-shell SiO2@TiO2/CDs nanocomposite demonstrates excellent performance as both a SERS substrate with high sensitivity and reproducibility for R6G detection down to 6×10^-8 M, and as a photocatalyst with efficient degradation of DNP achieving 96% rate in 120 minutes and good cycle stability. This multifunctional material shows promise for applications in environmental monitoring and pollution control.
研究不足
The study may have limitations in scalability for industrial applications, potential variability in nanocomposite synthesis, and the need for further optimization under real-world conditions. The use of specific chemicals and equipment might restrict broader applicability.
1：Experimental Design and Method Selection:
The study involved synthesizing yolk-shell SiO2@TiO2/CDs nanocomposites using a facile method, including St?ber process for SiO2, sol-gel for TiO2 coating, etching with NH4F to create cavities, and modification with carbon dots (CDs). Methods were chosen for simplicity and effectiveness in creating multifunctional nanomaterials.
2：Sample Selection and Data Sources:
Samples included SiO2 nanospheres, core-shell SiO2@TiO2, yolk-shell SiO2@TiO2, and yolk-shell SiO2@TiO2/CDs. Data were obtained from laboratory synthesis and characterization techniques.
3：List of Experimental Equipment and Materials:
Chemicals such as tetraethyl orthosilicate (TEOS), tetrabutyltitanate (TBT), citric acid, ethanol, ammonium hydroxide, ammonium fluoride, dinitraphenols (DNP), rhodamine 6G (R6G) from suppliers like Aladdin Chemistry Co. Ltd and Sinopharm Chemical Reagent Co. Ltd. Equipment included centrifuges, ovens, muffle roaster, heating mantle, autoclave, dialysis equipment, freeze dryer, UV-Vis spectrophotometer, Raman spectrometer with hydrogen ion laser (Spectra-physics model 163-C4260), XRD, FTIR, BET surface area analyzer, TEM, SEM.
4：Experimental Procedures and Operational Workflow:
Steps included preparation of SiO2 nanospheres via St?ber method, synthesis of CDs from citric acid hydrothermal treatment, coating SiO2 with TiO2 shell, etching to form yolk-shell structure, modification with CDs, photocatalytic degradation tests with DNP using a 450 W xenon lamp, and SERS detection of R6G using laser excitation at 532 nm.
5：Data Analysis Methods:
Data were analyzed using UV-Vis absorption spectra for photocatalytic degradation monitoring, Raman spectra for SERS signal enhancement, XRD for crystal structure, FTIR for functional groups, BET for surface area and pore size, TEM and SEM for morphology.
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