研究目的
To design and fabricate a 3D net-like structured fluorescent aerogel based on carboxy-methylated cellulose nanofibrils and carbon dots for the effective removal and sensitive detection of Cr(VI) from aqueous solutions.
研究成果
The synthesized 3D net-like structured fluorescent aerogel based on CM-CNF and CDs demonstrated high adsorption capacity for Cr(VI) and effective sensing capabilities, making it a promising material for water purification and heavy metal detection applications.
研究不足
The study does not address the scalability of the synthesis process for industrial applications or the long-term stability and reusability of the aerogel under various environmental conditions.
1：Experimental Design and Method Selection:
The study involved the synthesis of a fluorescent aerogel using CM-CNF and CDs through chemical crosslinking and free radical polymerization.
2：Sample Selection and Data Sources:
CM-CNF was synthesized from bleached eucalyptus kraft pulp, and CDs were prepared from citric acid and ethylenediamine.
3：List of Experimental Equipment and Materials:
High-pressure homogenizer, Teflon-sealed autoclave, ultrasonic washing machine, scanning electron microscopy, X-ray diffractometry, FTIR spectrometer, UV-vis spectrophotometer, fluorescence spectrophotometer, ICP-OES.
4：Experimental Procedures and Operational Workflow:
The synthesis process included the preparation of CM-CNF, CDs, CM-CNF-CDs, and the fluorescent aerogel, followed by characterization and adsorption experiments.
5：Data Analysis Methods:
Adsorption isotherm and kinetics data were analyzed using Langmuir and Freundlich models, and pseudo-first-order and pseudo-second-order models, respectively.
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X-ray diffractometry
D8 Advance
Bruker
Used to analyze the crystalline properties of the synthesized fluorescent aerogel.
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fluorescence spectrophotometer
F-7000
Hitachi
Used to measure the excitation and fluorescence spectra of the synthesized fluorescent aerogel.
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ICP-OES
Optima 5300 DV
Perkin Elmer
Used to measure the Cr6+ concentration.
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high-pressure homogenizer
Used for homogenizing the pulp suspension to obtain CM-CNF suspension.
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Teflon-sealed autoclave
30 mL
Used for the hydrothermal synthesis of carbon dots.
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ultrasonic washing machine
360 W, 50 kHz
Used for ultrasonic stirring during the preparation of CM-CNF-CDs.
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scanning electron microscopy
Tescan MIRA3 FEG-SEM
Tescan
Used to determine the surface morphology of the synthesized fluorescent aerogel.
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FTIR spectrometer
Thermo Nicolet IN 10TM
Nicolet
Used to measure the functional groups of the synthesized fluorescent aerogel.
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UV-vis spectrophotometer
TU-1901
Beijing Purkinje General
Used to characterize the optical absorption of the synthesized fluorescent aerogel.
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