To effectively detect and remove Cr(VI) from aqueous solution, a 3D net-like structured fluorescent aerogel was designed and synthesized using highly photoluminescent carbon dots (CDs) and renewable natural carboxy-methylated cellulose nanofibrils (CM-CNFs). The surface morphology, microstructure, chemical elements and fluorescence properties of this novel aerogel were studied. Adsorption experiments were designed to investigate the adsorption of Cr(VI) onto this fluorescent aerogel. The adsorption process was described by the pseudo-second-order kinetic model and Freundlich model, and the maximum adsorption capacity for Cr(VI) reached 433.5 mg g⁻¹. Furthermore, this novel aerogel emitted bright blue fluorescence with a quantum yield of 11.8% when applied to Cr(VI) sensing, and a good linear relationship between the quantum yield and Cr(VI) concentration was demonstrated. Accordingly, this novel 3D net-like structured fluorescent aerogel should be a promising smart sorbent for the removal of Cr(VI) with advantages of the 3D net-like structure and rich functional groups that accelerate Cr(VI) adsorption and the wrapped fluorescent probe that improves Cr(VI) sensing.

中文翻译：

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一种基于羧基甲基化纤维素纳米纤丝和碳点的3D网状结构荧光气凝胶，可作为高效的Cr（VI）吸附剂和灵敏的光学传感器

为了有效地从水溶液中检测并去除Cr（VI），设计并使用高光致发光碳点（CD）和可再生天然羧甲基化纤维素纳米纤丝（CM-CNF）合成了3D网状结构的荧光气凝胶。研究了这种新型气凝胶的表面形态，微观结构，化学元素和荧光性质。设计吸附实验以研究Cr（VI）在该荧光气凝胶上的吸附。用拟二级动力学模型和Freundlich模型描述了吸附过程，对Cr（VI）的最大吸附容量达到433.5 mg g ^-1。此外，这种新颖的气凝胶在应用于Cr（VI）传感时发出蓝色荧光，量子产率为11.8％，并且量子产率与Cr（VI）浓度之间具有良好的线性关系。因此，这种新颖的3D网状结构化荧光气凝胶应具有3D网状结构和丰富的可加速Cr（VI）吸附的官能团以及包裹的荧光探针的优点，是一种用于去除Cr（VI）的有前途的智能吸附剂。改善了Cr（VI）感测。