Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability
To provide an economical magnetic photocatalyst and introduce an innovative approach for efficiently utilizing discarded waste rice noodle (WRN) and iron oxide scale (IOS), we initially converted WRN into carbon quantum dots (CQDs) using a hydrothermal method, simultaneously calcining IOS to obtain...
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MDPI AG
2023-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/18/2506 |
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| author | Wanying Ying Qing Liu Xinyan Jin Guanzhi Ding Mengyu Liu Pengyu Wang Shuoping Chen |
| author_facet | Wanying Ying Qing Liu Xinyan Jin Guanzhi Ding Mengyu Liu Pengyu Wang Shuoping Chen |
| author_sort | Wanying Ying |
| collection | DOAJ |
| description | To provide an economical magnetic photocatalyst and introduce an innovative approach for efficiently utilizing discarded waste rice noodle (WRN) and iron oxide scale (IOS), we initially converted WRN into carbon quantum dots (CQDs) using a hydrothermal method, simultaneously calcining IOS to obtain iron oxide (FeO<sub>x</sub>). Subsequently, we successfully synthesized a cost-effective, magnetic CQDs/FeO<sub>x</sub> photocatalytic composite for the first time by combining the resulting CQDs and FeO<sub>x</sub>. Our findings demonstrated that calcining IOS in an air atmosphere enhanced the content of photocatalytically active α-Fe<sub>2</sub>O<sub>3</sub>, while incorporating WRN-based CQDs into FeO<sub>x</sub> improved the electron-hole pair separation, resulting in increased O<sub>2</sub> reduction and H<sub>2</sub>O oxidation. Under optimized conditions (IOS calcination temperature: 300 °C; carbon loading: 11 wt%), the CQDs/FeO<sub>x</sub> composite, utilizing WRN and IOS as its foundation, exhibited exceptional and reusable capabilities in photodegrading methylene blue and tetracycline. Remarkably, for methylene blue, it achieved an impressive degradation rate of 99.30% within 480 min, accompanied by a high degradation rate constant of 5.26 × 10<sup>−3</sup> min<sup>−1</sup>. This composite demonstrated reusability potential for up to ten photocatalytic cycles without a significant reduction in the degradation efficiency, surpassing the performance of IOS and FeO<sub>x</sub> without CQDs. Notably, the composite exhibited strong magnetism with a saturation magnetization strength of 34.7 emu/g, which enables efficient and convenient recovery in photocatalytic applications. This characteristic is highly advantageous for the large-scale industrial utilization of photocatalytic water purification. |
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| language | English |
| last_indexed | 2024-03-10T22:22:19Z |
| publishDate | 2023-09-01 |
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| series | Nanomaterials |
| spelling | doaj.art-802a342ba7144874a4b8798a2bad21a52023-11-19T12:13:55ZengMDPI AGNanomaterials2079-49912023-09-011318250610.3390/nano13182506Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic CapabilityWanying Ying0Qing Liu1Xinyan Jin2Guanzhi Ding3Mengyu Liu4Pengyu Wang5Shuoping Chen6College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaCollege of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaCollege of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaCollege of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaCollege of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaCollege of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaCollege of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, ChinaTo provide an economical magnetic photocatalyst and introduce an innovative approach for efficiently utilizing discarded waste rice noodle (WRN) and iron oxide scale (IOS), we initially converted WRN into carbon quantum dots (CQDs) using a hydrothermal method, simultaneously calcining IOS to obtain iron oxide (FeO<sub>x</sub>). Subsequently, we successfully synthesized a cost-effective, magnetic CQDs/FeO<sub>x</sub> photocatalytic composite for the first time by combining the resulting CQDs and FeO<sub>x</sub>. Our findings demonstrated that calcining IOS in an air atmosphere enhanced the content of photocatalytically active α-Fe<sub>2</sub>O<sub>3</sub>, while incorporating WRN-based CQDs into FeO<sub>x</sub> improved the electron-hole pair separation, resulting in increased O<sub>2</sub> reduction and H<sub>2</sub>O oxidation. Under optimized conditions (IOS calcination temperature: 300 °C; carbon loading: 11 wt%), the CQDs/FeO<sub>x</sub> composite, utilizing WRN and IOS as its foundation, exhibited exceptional and reusable capabilities in photodegrading methylene blue and tetracycline. Remarkably, for methylene blue, it achieved an impressive degradation rate of 99.30% within 480 min, accompanied by a high degradation rate constant of 5.26 × 10<sup>−3</sup> min<sup>−1</sup>. This composite demonstrated reusability potential for up to ten photocatalytic cycles without a significant reduction in the degradation efficiency, surpassing the performance of IOS and FeO<sub>x</sub> without CQDs. Notably, the composite exhibited strong magnetism with a saturation magnetization strength of 34.7 emu/g, which enables efficient and convenient recovery in photocatalytic applications. This characteristic is highly advantageous for the large-scale industrial utilization of photocatalytic water purification.https://www.mdpi.com/2079-4991/13/18/2506waste rice noodleiron oxide scalecarbon quantum dots/iron oxide compositephotocatalytic capabilitymagnetic |
| spellingShingle | Wanying Ying Qing Liu Xinyan Jin Guanzhi Ding Mengyu Liu Pengyu Wang Shuoping Chen Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability Nanomaterials waste rice noodle iron oxide scale carbon quantum dots/iron oxide composite photocatalytic capability magnetic |
| title | Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability |
| title_full | Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability |
| title_fullStr | Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability |
| title_full_unstemmed | Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability |
| title_short | Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability |
| title_sort | magnetic carbon quantum dots iron oxide composite based on waste rice noodle and iron oxide scale preparation and photocatalytic capability |
| topic | waste rice noodle iron oxide scale carbon quantum dots/iron oxide composite photocatalytic capability magnetic |
| url | https://www.mdpi.com/2079-4991/13/18/2506 |
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