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257 results on '"Zhu, Guifen"'

21. Fast and eco-friendly synthesis of carbon dots from pinecone for highly effective detection of 2,4,6-trinitrophenol in environmental samples.

Author

Liu, Yongli, Ge, Guobei, Liu, Huanjia, Wang, Yuxin, Zhou, Penghui, Li, Bin, and Zhu, Guifen

Subjects
PICRIC acid, ENVIRONMENTAL sampling, FLUORESCENT probes, PINE cones, DETECTION limit
Abstract

2,4,6-Trinitrophenol (TNP) has high explosive risks and biological toxicity, and there has been considerable concern over the determination of TNP. In the present work, fluorescent carbon dots (CDs) stemmed from a green carbon source of pinecone by the facile hydrothermal approach. A novel environment- friendly fluorescent probe was developed to efficiently detect TNP by using the obtained CDs with remarkable fluorescence stability. The fluorescent CDs exhibited obvious excitation dependence with the highest peaks for excitation and emission occurring at 321 and 411 nm, respectively. The fluorescence intensity is significantly reduced by TNP owing to the inner filter effect with the CDs. The probe exhibited good linearity with TNP concentrations in the range of 0.025–20 μg mL−1, and the limit of detection was as low as 8.5 ng mL−1. Additionally, the probe proved successful in sensing TNP quantitatively in actual environmental samples with satisfied recoveries of 95.6–99.6%. The developed fluorescent probe offered an environment-friendly, efficient, rapid, and reliable platform for detecting trace TNP in the environmental field. Highlights Novel carbon dots were synthesised from green precursors of pineal powder. The highly effective quenching process was put down to the inner filter effect. The as-constructed fluorescent probe was successfully utilised for sensing 2,4,6-trinitrophenol in environmental samples. The proposed method was simple, rapid, efficient, economical, and eco-friendly. [ABSTRACT FROM AUTHOR]

Published
2025
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46. Highly effective and fast removal of bisphenol A from environmental samples using an eco-friendly surface molecularly imprinted polymer based on MIL-100(Fe).

Author

Liu, Yongli, Li, Wanwan, Liu, Lin, Chen, Runan, Wang, Li, Li, Bin, Duan, Ruijuan, and Zhu, Guifen

Subjects
IMPRINTED polymers, BISPHENOL A, ENVIRONMENTAL sampling, FOOD containers, ENDOCRINE disruptors, ADSORPTION capacity, SOYMILK
Abstract

Bisphenol A (BPA) is an endocrine disruptor and poses serious threats to human health, and widespread concern has been raised regarding its effective removal from the environment. In this work, an eco-friendly surface molecularly imprinted composite (MIL-100(Fe)@MIP) was successfully fabricated in the green solvent of water and further achieved the fast and effective removal of BPA. The maximum adsorption capacity of BPA bound to MIL-100(Fe)@MIP was 15.45 mg g−1, and the adsorption behavior was adequately described with the Langmuir model. MIL-100(Fe)@MIP acquired fast adsorption of BPA, and the equilibrium adsorption capacity achieved 95% within 10 min. The adsorption process better matches the pseudo-second-order model. As a solid phase sorbent, MIL-100(Fe)@MIP was successfully applied to rapidly and efficiently remove BPA from five real samples, which included disposable food containers, canned yellow peach, orange juice, soybean milk and teabags, and the recoveries ranged from 80.67% to 100.58%. Furthermore, MIL-100(Fe)@MIP exhibited excellent reusability for 20 cycles. Hence, the developed MIL-100(Fe)@MIP is an eco-friendly and promising adsorbent that can effectively and rapidly remove BPA from the environment. [ABSTRACT FROM AUTHOR]

Published
2024
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