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用于铬吸附的富勒烯和树形/指纹状碳量子点的微波辅助合成

Fullerenes and tree-shaped/fingerprinted carbon quantum dots for chromium adsorption microwave-assisted synthesis.

作者信息

Tohamy Hebat-Allah S, El-Sakhawy Mohamed, Kamel Samir

机构信息

Cellulose and Paper Department, National Research Centre 33 El Bohouth Str., PO 12622 Dokki Giza Egypt

出版信息

RSC Adv. 2024 Aug 16;14(35):25785-25792. doi: 10.1039/d4ra04527k. eCollection 2024 Aug 12.

DOI:10.1039/d4ra04527k
PMID:39156751
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11327553/
Abstract

: Employing citric acid/dimethyl formamide (CA/DMF), two distinct types of carbon quantum dots (CQDs), tree-shaped/fingerprinted (TF-CQDs) and fullerene-like (F) were synthesized from both cellulose and carboxymethyl cellulose (CMC). : Fluorescence microscopy revealed different emission colors: blue for TF-CQDs and green for F, highlighting the structural influence on light properties. Transmission electron microscopy (TEM) confirmed the intricate fingerprinted and tree-like morphology of TF-CQDs and the spherical nature of F derived from CMC. The adsorption behavior and kinetics of Cr(vi) removal from water by TF-CQDs and F were evaluated. : Both samples demonstrated rapid Cr(vi) uptake; TF-CQDs reached equilibrium within 120 minutes compared to 240 minutes for F. Subsequent leaching led to decreased adsorption after these initial periods. Kinetic analysis revealed a first-order model for TF-CQDs, implying physical adsorption dominance. Conversely, F exhibited a better fit to pseudo-first and second-order models, suggesting combined chemical and physical mechanisms.

摘要

采用柠檬酸/二甲基甲酰胺（CA/DMF），从纤维素和羧甲基纤维素（CMC）合成了两种不同类型的碳量子点（CQD），即树形/指纹状（TF-CQD）和富勒烯样（F）。荧光显微镜显示出不同的发射颜色：TF-CQD为蓝色，F为绿色，突出了结构对光学性质的影响。透射电子显微镜（TEM）证实了TF-CQD复杂的指纹状和树形形态以及源自CMC的F的球形性质。评估了TF-CQD和F从水中去除Cr(VI)的吸附行为和动力学。两个样品都表现出快速的Cr(VI)摄取；TF-CQD在120分钟内达到平衡，而F则需要240分钟。在这些初始阶段之后，随后的浸出导致吸附减少。动力学分析表明TF-CQD符合一级模型，这意味着物理吸附占主导。相反，F对伪一级和二级模型的拟合更好，表明存在化学和物理联合机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/eab5818fcc37/d4ra04527k-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/b74d6cf6ea96/d4ra04527k-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/4876776b5806/d4ra04527k-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/ba31fc8267d1/d4ra04527k-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/d76ab122857d/d4ra04527k-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/eab5818fcc37/d4ra04527k-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/b74d6cf6ea96/d4ra04527k-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/4876776b5806/d4ra04527k-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/ba31fc8267d1/d4ra04527k-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/d76ab122857d/d4ra04527k-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7cc8/11327553/eab5818fcc37/d4ra04527k-f5.jpg

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