研究目的
To prepare a novel Ag/TiO2/AOF catalyst for enhanced photocatalytic degradation of dyes under visible light, with easy recovery and reuse.
研究成果
The Ag/TiO2/AOF catalyst demonstrates high photocatalytic activity with 99% RhB degradation under visible light, easy recovery, and good stability over multiple cycles, making it promising for environmental remediation applications.
研究不足
The study may have limitations in scalability for industrial applications, potential residual chlorine from precursors affecting catalyst purity, and the need for further optimization of Ag loading levels for maximum efficiency.
1：Experimental Design and Method Selection:
The study used a coordination-hydrolysis method combined with photo-reduction to prepare Ag/TiO2/AOF catalysts on modified fibers. This method was chosen to enhance the separation ability and photocatalytic activity of TiO2 under visible light.
2：Sample Selection and Data Sources:
Polyacrylonitrile (PAN) fibers were modified to amidoxime fibers (AOFs) and used as substrates. Rhodamine B (RhB) was used as the model pollutant for degradation tests.
3：List of Experimental Equipment and Materials:
Materials included AgNO3, NH2OH, TiCl4, Rhodamine B from Shanghai Sinopharm Reagent Co., Ltd., and PAN fibers from Jilin Carbon Co., Ltd. Equipment included a Bruker AXS-D8X X-ray diffractometer, Hitachi S-4800 Scanning electron microscope, XPS analyzer, Shimadzu UV-2550 spectrophotometer, 500 W arc Xenon lamp, and Shimadzu UV2501PC spectrophotometer.
4：Experimental Procedures and Operational Workflow:
PAN fibers were immersed in NH2OH solution to form AOFs. AOFs were then treated with TiCl4 to form TiO2/AOF, followed by AgNO3 treatment under light absence to form Ag/TiO2/AOF. Photocatalytic tests involved adding catalyst to RhB solution, stirring in darkness for adsorption equilibrium, and irradiating with visible light while sampling at intervals for UV-vis analysis.
5：Data Analysis Methods:
Data were analyzed using XRD for crystal structure, SEM for morphology, XPS for elemental composition, UV-vis DRS for optical properties, and UV-vis spectroscopy for RhB degradation rates.
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X-ray diffractometer
Bruker AXS-D8X
Bruker
Used for collecting X-ray diffraction patterns to characterize crystal structures of samples.
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Scanning electron microscope
Hitachi S-4800
Hitachi
Used for SEM characterizations to examine the morphology and surface features of samples.
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Spectrophotometer
Shimadzu UV-2550
Shimadzu
Used for recording ultraviolet visible diffuse reflectance spectra (UV-vis DRS) of samples with an integrating sphere.
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Spectrophotometer
Shimadzu UV2501PC
Shimadzu
Used for analyzing variations in absorption bands of RhB during photodegradation experiments.
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Arc Xenon lamp
500 W
Used as a simulated solar light source for photocatalytic tests under visible light irradiation.
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