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- 저자 : Ma Linping (검색결과 2 건)
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Ma Linping,Long Xiang,Ma Yanshun,Wu Shaogui 한국탄소학회 2024 Carbon Letters Vol.34 No.3
Carbon dots (CDs) are versatile nanomaterials with tunable luminescent properties. We used a natural plant kaempferol as a carbon source to synthesize multicolor CDs by reacting it with various nitrogen sources. Blue, green, and red CDs (B-CDs, G-CDs, and R-CDs) with emission wavelengths of 445 nm, 510 nm, and 600 nm respectively were successfully synthesized. Their photoluminescence quantum yields of are up to 37.4%, 20.1%, and 30.8%, respectively. Surface analysis revealed abundant nitrogen groups influencing luminescence. B-CDs and G-CDs show excitation-dependent emissions, indicating a potential correlation between their luminescence and particle sizes, while R-CDs exhibit excitation-independent emission, suggesting they belong to molecular state CDs. All three CDs exhibit stable luminescent performance, as well as good salt resistance and photobleaching resistance. The practical application of multicolored CDs in anti-counterfeiting fluorescent inks was further explored. This work offers a straightforward, eco-friendly route to synthesize multicolor CDs.
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Jiang Yuting,Key Laboratory of Science & Technology of Eco-Textile, Ministry of Edu,Zhang Hongyu,Wu Wei,Ji Bolin,Zhong Yi,Xu Hong,Feng Xueling,Wang Bijia,Ma Yimeng,Mao Zhiping,Zhang Linping 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.7
As an indispensable medicine, antibiotics are widely used in daily life, but following the substantial discharge of various wastewater, which result in antibiotic resistance of microbial pathogens and jeopardizes the health of ecosystems. There is an urgent need to tackle drug residues. After decades of intensive research, photocatalysis technology has been developed into an effi cient technology for wastewater treatment due to its economic and environmental-friendly properties. Here, the photocatalyst NH 2 -MIL-101(Fe)/TiO 2 composite was fabricated to degrade the antibiotics: tetracycline hydrochloride (TC), doxycycline hydrochloride (DC), and levofl oxacin hydrochloride (LEV). The NH 2 -MIL-101(Fe)/TiO 2 photocatalysts exhibited excellent visible light harvesting performance with a narrow band gap (2.19 eV), low recombination ratio of photoinduced carriers, good photoelectric response, low resistance and long charging life. NH 2 -MIL-101(Fe)/TiO 2 (MT0.50 molar ratio Fe:Ti = 1:1) showed the highest degradation eff ect, with the degradation rates of 91.52%, 80.11%, and 88.13% for TC, DC, and LEV in 6 h, with kinetic constants of 0.00510 min −1 , 0.00344 min −1 and 0.00503 min −1 , respectively. The catalysts exhibited signifi cantly increased photocatalytic activity and excellent stability compared to NH 2 -MIL-101 (Fe) and TiO 2 . In addition, MT0.50 still showed good photodegradation eff ect under simulated diff erent pH and ionic strength, indicating that MT0.50 has good adaptability and practical application. The study of photocatalytic mechanism showed that ·OH was the main active substance in the degradation process, which played an important role in degrading antibiotics. In addition, three possible degradation pathways for antibiotics were proposed based on the intermediates detected by LC–MS, and the photocatalysts also showed great stability and excellent antimicrobial eff ects. Therefore, the present study provides a new strategy and enriches the mechanisms involved in the wastewater treatment of NH 2 -MIL-101(Fe)/TiO 2 photodegradation of various antibiotics.
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