研究目的
To develop novel photo-Fenton catalysts by milling TiO2 with Schwertmannite to enhance the efficiency and reduce costs of organic contaminant degradation in water and soil remediation.
研究成果
The TiO2/Sh nanocomposites exhibit superior photo-Fenton catalytic activity due to enhanced electron transfer from TiO2 to Sh, leading to higher Fe(II) generation, H2O2 decomposition, and ?OH production. They show high stability, low Fe dissolution, and efficient degradation of RhB, indicating promising applications in wastewater treatment with a simple, low-cost synthesis method.
研究不足
The study is limited to laboratory-scale experiments with specific conditions (e.g., pH 3-6, specific catalyst dosages), and real-world applications may face challenges such as scalability, varying water matrices, and long-term stability in diverse environments. Optimization for different contaminants and industrial settings is needed.
1：Experimental Design and Method Selection:
The study involved synthesizing TiO2/Sh nanocomposites via a solvent-free milling method to create catalysts for heterogeneous photo-Fenton reactions, aiming to improve electron transfer and Fe(III) reduction.
2：Sample Selection and Data Sources:
Schwertmannite (Sh) was prepared from FeSO4 solution using H2O2 oxidation, and TiO2 (P25) was commercially obtained. Rhodamine B (RhB) was used as the model contaminant.
3：List of Experimental Equipment and Materials:
Equipment included a planetary ball mill (Nanjing NanDa, QM-3SP04), XRD diffractometer (Rigaku D/Max 2500), UV-Vis spectrophotometer (Shimadzu UV-2550), N2 adsorption instrument (Micromeritics ASAP 2020M), FESEM (Hitachi S8010), TEM (FEI Talos F200S), Xenon arc lamp (BL-GHX-CH500, Xi'an Depai Biotech. Co. Ltd.), and HPLC (Agilent 1260). Materials included TiO2 (P25 from Degussa), FeSO4·7H2O, H2O2, RhB, and various chemicals from Sinopharm Chemical Reagent Co. Ltd.
4：0). Materials included TiO2 (P25 from Degussa), FeSO4·7H2O, H2O2, RhB, and various chemicals from Sinopharm Chemical Reagent Co. Ltd. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Sh was synthesized and milled with TiO2. Catalysts were characterized using XRD, SEM, TEM, BET, and UV-Vis. Photo-Fenton reactions were conducted with RhB under simulated sunlight, measuring degradation, H2O2 consumption, ?OH production, Fe(II) content, and Fe dissolution. Radical scavenger experiments used IPA, BQ, and EDTA.
5：Catalysts were characterized using XRD, SEM, TEM, BET, and UV-Vis. Photo-Fenton reactions were conducted with RhB under simulated sunlight, measuring degradation, H2O2 consumption, ?OH production, Fe(II) content, and Fe dissolution. Radical scavenger experiments used IPA, BQ, and EDTA. Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using UV-Vis spectroscopy for concentration measurements, kinetic rate constants calculated, and statistical methods applied as per standard protocols.
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X-ray Diffractometer
D/Max 2500
Rigaku
Used for characterizing the crystal structure of samples via XRD patterns.
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UV-Vis Spectrophotometer
UV-2550
Shimadzu
Used for measuring steady-state UV-Vis diffuse reflectance spectra and concentrations of complexes.
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Field-Emission Scanning Electron Microscope
S8010
Hitachi
Used for morphological analysis of samples with EDS for elemental analysis.
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Transmission Electron Microscope
Talos F200S
FEI
Used for acquiring TEM images and EDS mapping for elemental distribution.
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High-Performance Liquid Chromatography
1260
Agilent
Used for determining phenol concentration in hydroxylation experiments.
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Total Organic Carbon Analyzer
TOC-VCPH
Shimadzu
Used for analyzing TOC concentration in degradation experiments.
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TiO2 P25
P25
Degussa
Used as a semiconductor in the nanocomposite catalyst for photo-Fenton reactions, to generate photo-electrons.
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Planetary Ball Mill
QM-3SP04
Nanjing NanDa
Used for milling TiO2 and Schwertmannite to synthesize nanocomposites.
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N2 Adsorption Instrument
ASAP 2020M
Micromeritics
Used for determining N2 adsorption-desorption isotherms and specific surface areas.
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Xenon Arc Lamp
BL-GHX-CH500
Xi'an Depai Biotech. Co. Ltd.
Used as a light source to simulate sunlight for photo-Fenton reactions.
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Atomic Absorption Spectrophotometer
Used for determining total dissolved iron ion concentration.
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