研究目的
To prepare hydrophilic CNT-hybrid metal oxides membranes using atomic layer deposition for enhanced photocatalytic degradation of dyes in wastewater treatments.
研究成果
The ALD-modified CNT membranes with hybrid ZnO-TiO2 oxides significantly improved hydrophilicity and photocatalytic activity, achieving high degradation efficiency and stable reusability for MB, showing promise for wastewater treatment applications.
研究不足
The study may have limitations in scalability for industrial applications, potential variability in ALD deposition uniformity on porous substrates, and the need for further optimization of cycle numbers for maximum efficiency. The focus on MB degradation might not generalize to other pollutants.
1：Experimental Design and Method Selection:
The study uses atomic layer deposition (ALD) to deposit ZnO and TiO2 on CNT membranes to enhance hydrophilicity and photocatalytic activity. The rationale is to overcome the hydrophobicity of CNTs and improve electron transfer to reduce recombination of photo-generated electron-holes.
2：Sample Selection and Data Sources:
Multi-walled CNT membranes from Suzhou Jiedi Nanotechnology Co., Ltd were used as substrates. Methylene blue (MB) was used as a model pollutant for degradation tests.
3：List of Experimental Equipment and Materials:
CNT membranes, diethyl zinc (DEZ), deionized water, titanium tetrachloride (TiCl4), nitrogen gas, methylene blue, hydrochloric acid, ethanol, ALD reactor (f-100-31, Wuxi MNT Co., Ltd), FESEM (Hitachi S-4800), contact angle goniometer (Dropmeter A-100, Maist), XRD (Rigaku MiniFlex 600), spectroscopic ellipsometer (Compete EASEM-2000U, J. A. Woollam), UV-vis spectrometer (NanoDROP 2000C, Thermo Scientific), high-temperature furnace (OTF-1200×-S, Hefei Kejing Co., Ltd).
4：Experimental Procedures and Operational Workflow:
CNT membranes were pretreated with HCl, washed, dried, and cut. ALD was performed at 150°C with specific pulse/exposure/purge times for ZnO and TiO2 cycles. Hybrid depositions were done alternatively. Samples were calcined at 600°C in Ar. Characterization included SEM, WCA measurements, XRD, and ellipsometry. Photocatalytic activity was evaluated by degrading MB under UV light, with concentration measured by UV-vis spectroscopy.
5：Data Analysis Methods:
Degradation efficiency was calculated using absorbance measurements. First-order kinetic models were applied to analyze degradation rates. Data were averaged from multiple measurements.
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FESEM
S-4800
Hitachi
Used to observe surface morphologies of the membranes.
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XRD
MiniFlex 600
Rigaku
Used to perform X-ray diffraction patterns of the membranes.
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Spectroscopic ellipsometer
Compete EASEM-2000U
J. A. Woollam
Used to determine thicknesses of deposited layers on Si wafers.
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UV-vis spectrometer
NanoDROP 2000C
Thermo Scientific
Used to measure concentration of MB solution during degradation tests.
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CNT membranes
Suzhou Jiedi Nanotechnology Co., Ltd
Used as substrates for ALD deposition to create photocatalytic membranes.
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Diethyl zinc
DEZ
Metalorganic Center, Nanjing University
Precursor for ZnO deposition in ALD process.
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Titanium tetrachloride
TiCl4
Metalorganic Center, Nanjing University
Precursor for TiO2 deposition in ALD process.
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ALD reactor
f-100-31
Wuxi MNT Co., Ltd
Used for atomic layer deposition of metal oxides on CNT membranes.
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Contact angle goniometer
Dropmeter A-100
Maist
Used to measure water contact angles of the membranes.
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High-temperature furnace
OTF-1200×-S
Hefei Kejing Co., Ltd
Used for calcination of samples to induce crystalline transformation.
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