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Guan S, Wang L, Hao L, Yoshida H, Itoi T, Lu Y, Terashima C, Fujishima A. Achieving water-floatable photocatalyst on recycled bamboo chopsticks. Sci Rep 2024; 14:9496. [PMID: 38664484 PMCID: PMC11045838 DOI: 10.1038/s41598-024-60272-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Accepted: 04/21/2024] [Indexed: 04/28/2024] Open
Abstract
Disposable bamboo chopsticks (DBCs) are difficult to recycle, which inevitably cause secondary pollution. Based on energy and environmental issues, we propose a facile strategy to fabricate floatable photocatalyst (fPC) coated onto DBCs, which can be flexibly used in water purification. The photocatalyst of titania and titanium carbide on bamboo (TiO2/TiC@b) was successfully constructed from TiC-Ti powders and DBCs using a coating technique followed heat treatment in carbon powder, and the fPC exhibited excellent photocatalytic activity under visible light irradation. The analysis results indicate that rutile TiO2 forms on TiC during heat treatment, achieving a low-density material with an average value of approximately 0.5233 g/cm3. The coatings of TiO2/TiC on the bamboo are firm and uniform, with a particle size of about 20-50 nm. XPS results show that a large amount of oxygen vacancies is generated, due to the reaction atmosphere of more carbon and less oxygen, further favoring to narrowing the band gap of TiO2. Furthermore, TiO2 formed on residual TiC would induce the formation of a heterojunction, which effectively inhibits the photogenerated electron-hole recombination via the charge transfer effect. Notably, the degradation of dye Rhodamine B (Rh.B) is 62.4% within 3 h, while a previous adsorption of 36.0% for 1 h. The excellent photocatalytic performance of TiO2/TiC@b can be attributed to the enhanced reaction at the water/air interface due to the reduced light loss in water, improved visible-light response, increased accessible area and charge transfer effect. Our findings show that the proposed strategy achieves a simple, low-cost, and mass-producible method to fabricate fPC onto the used DBCs, which is expected to applied in multiple fields, especially in waste recycling and water treatment.
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Affiliation(s)
- Sujun Guan
- Research Center for Space System Innovation, Tokyo University of Science, Chiba, 2788510, Japan
| | - Lijun Wang
- School of Intelligent Manufacturing, Chengdu Technological University, Chengdu, 610031, China.
| | - Liang Hao
- College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin, 300222, China
| | - Hiroyuki Yoshida
- Chiba Industrial Technology Research Institute, Chiba, 2630016, Japan
| | - Takaomi Itoi
- Graduate School and Faculty of Engineering, Chiba University, Chiba, 2638522, Japan
| | - Yun Lu
- School of Intelligent Manufacturing, Chengdu Technological University, Chengdu, 610031, China
- Graduate School and Faculty of Engineering, Chiba University, Chiba, 2638522, Japan
| | - Chiaki Terashima
- Research Center for Space System Innovation, Tokyo University of Science, Chiba, 2788510, Japan
- Department of Pure and Applied Chemistry, Tokyo University of Science, Chiba, 2788510, Japan
| | - Akira Fujishima
- Research Center for Space System Innovation, Tokyo University of Science, Chiba, 2788510, Japan
- Shanghai Institute of Photocatalysis Industrial Technology, University of Shanghai for Science and Technology, Shanghai, 200093, China
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Jong R, Dubbelman E, Mul G. Electro-oxidation of propylene by palladium functionalized titanium hollow fibre electrodes. J Catal 2022. [DOI: 10.1016/j.jcat.2022.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Jong RPH, Mul G. Gas flow stimulated hydrodynamics for preparation and application of platinized titanium hollow fibre electrodes. ChemElectroChem 2022. [DOI: 10.1002/celc.202101135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ronald P. H. Jong
- University of Twente Institute for Nanotechnology: Universiteit Twente MESA+ Faculty of Science and Technology Enschede NETHERLANDS
| | - Guido Mul
- University of Twente MESA+ Institute for Nanotechnology Drienerlolaan 5PO Box 217 7500 AE Enschede NETHERLANDS
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Krzywda PM, Paradelo Rodríguez A, Benes NE, Mei BT, Mul G. Effect of Electrolyte and Electrode Configuration on Cu‐Catalyzed Nitric Oxide Reduction to Ammonia. ChemElectroChem 2022. [DOI: 10.1002/celc.202101273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Piotr M. Krzywda
- Photocatalytic Synthesis Group Faculty of Science & Technology of the University of Twente PO Box 217 Enschede The Netherlands
- Membrane Science and Technology Cluster Faculty of Science & Technology of the University of Twente PO Box 217 Enschede The Netherlands
| | - Ainoa Paradelo Rodríguez
- Photocatalytic Synthesis Group Faculty of Science & Technology of the University of Twente PO Box 217 Enschede The Netherlands
| | - Nieck E. Benes
- Membrane Science and Technology Cluster Faculty of Science & Technology of the University of Twente PO Box 217 Enschede The Netherlands
| | - Bastian T. Mei
- Photocatalytic Synthesis Group Faculty of Science & Technology of the University of Twente PO Box 217 Enschede The Netherlands
| | - Guido Mul
- Photocatalytic Synthesis Group Faculty of Science & Technology of the University of Twente PO Box 217 Enschede The Netherlands
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Krzywda PM, Paradelo Rodríguez A, Cino L, Benes NE, Mei BT, Mul G. Electroreduction of NO 3− on tubular porous Ti electrodes. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00289b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Tubular porous Ti electrodes show unprecedented performance in the electrochemical reduction of nitrate to ammonia, which increased from −33 to −75 mA cm2 by applying an inert gas flow exiting through the pores of the Ti tube.
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Affiliation(s)
- Piotr M. Krzywda
- Photocatalytic Synthesis Group, Faculty of Science & Technology of the University of Twente, PO Box 217, Enschede, The Netherlands
- Membrane Science and Technology Cluster, Faculty of Science & Technology of the University of Twente, PO Box 217, Enschede, The Netherlands
| | - Ainoa Paradelo Rodríguez
- Photocatalytic Synthesis Group, Faculty of Science & Technology of the University of Twente, PO Box 217, Enschede, The Netherlands
| | - Lukas Cino
- Photocatalytic Synthesis Group, Faculty of Science & Technology of the University of Twente, PO Box 217, Enschede, The Netherlands
| | - Nieck E. Benes
- Membrane Science and Technology Cluster, Faculty of Science & Technology of the University of Twente, PO Box 217, Enschede, The Netherlands
| | - Bastian T. Mei
- Photocatalytic Synthesis Group, Faculty of Science & Technology of the University of Twente, PO Box 217, Enschede, The Netherlands
| | - Guido Mul
- Photocatalytic Synthesis Group, Faculty of Science & Technology of the University of Twente, PO Box 217, Enschede, The Netherlands
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Optimizing Temperature Treatment of Copper Hollow Fibers for the Electrochemical Reduction of CO2 to CO. Catalysts 2021. [DOI: 10.3390/catal11050571] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Copper hollow fibers were prepared via dry-wet spinning of a polymer solution of N-methylpyrrolidone, Polyetherimide, Polyvinyl Pyrolidone, and copper particles of sizes in the range of 1–2 µm. To remove template molecules and to sinter the copper particles, the time of calcination was varied in a range of 1–4 h at 600 °C. This calcination temperature was determined based on Thermal Gravimetric Analysis (TGA), showing completion of hydrocarbon removal at this temperature. Furthermore, the temperature of the subsequent treatment of the fibers in a flow of 4% H2 (in Ar) was varied in the range of 200 °C to 400 °C, at a fixed time of 1 h. Temperature programmed reduction experiments (TPR) were used to analyze the hydrogen treatment. The Faradaic Efficiency (FE) towards CO in electrochemical reduction of CO2 was determined at −0.45 V vs. RHE (Reversible Hydrogen Electrode), using a 0.3 M KHCO3 electrolyte. A calcination time of 3 h at 600 °C and a hydrogen treatment temperature of 280 °C were found to induce the highest FE to CO of 73% at these constant electrochemical conditions. Optimizing oxidation properties is discussed to likely affect porosity, favoring the CO2 gas distribution over the length of the fiber, and hence the CO2 reduction efficiency. Treatment in H2 in the range of 250 to 300 °C is proposed to affect the content of residual (subsurface) oxygen in Cu, which leads to favorable properties on the nanoscale.
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