A novel fluorescent nanocellulosic hydrogel based on carbon dots for efficient adsorption and sensitive sensing in heavy metals,Journal of Materials Chemistry A

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A novel fluorescent nanocellulosic hydrogel based on carbon dots for efficient adsorption and sensitive sensing in heavy metals
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-11-14 , DOI: 10.1039/c9ta11502a
Xin Guo _{1,

2,

3,

4} , Dong Xu _{2,

3,

4,

5} , Hanmeng Yuan _{1,

2,

3,

4} , Qiuyan Luo _{1,

2,

3,

4} , Shiyao Tang _{2,

3,

4,

6} , Liu Liu _{2,

3,

4,

6} , Yiqiang Wu _{2,

3,

4,

6}

Affiliation

To take advantage of the high aspect ratio of cellulose nanofibrils (CNFs) and high performance luminescence of carbon dots (CDs), a novel fluorescent nanocellulosic hydrogel was synthesised and used not only as an effective adsorbent for the removal of heavy metals, but also as an optical sensor for the detection of heavy metals. This fluorescent nanocellulosic hydrogel was characterized with respect to its morphological features, chemical composition and optical properties by means of optical microscopy, SEM, XRD, FTIR, UV-vis and fluorescence spectroscopy. The effects of contact time and initial concentration on the adsorption performance of the nanocellulosic hydrogel were investigated. Based on the experimental results, the maximum adsorption capacities for Fe³⁺, Ba²⁺, Pb²⁺ and Cu²⁺ were 769, 212, 2056 and 1246 mg g⁻¹, respectively. The prepared fluorescent nanocellulosic hydrogel demonstrated strong blue fluorescence with a fluorescence quantum yield of 23.6%, and displayed high sensitivity for the detection of Fe³⁺. In this hydrogel, the CNFs modified with CDs not only facilitated hydroxyl-induced aggregation of heavy metals as the adsorption-aggregator, but also allowed a rapid visual response to heavy metals as the optical sensor, which increased the adsorption capacity of heavy metals, and improved the stability of the fluorescence signal and the sensitivity for determining the concentration of heavy metals.

中文翻译：

一种基于碳点的新型荧光纳米纤维素水凝胶，可有效吸附和灵敏地检测重金属

为了利用纤维素纳米原纤维（CNF）的高长宽比和碳点（CD）的高性能发光，合成了一种新型的荧光纳米纤维素水凝胶，不仅用作去除重金属的有效吸附剂，而且还用作用于检测重金属的光学传感器。通过光学显微镜，SEM，XRD，FTIR，UV-vis和荧光光谱对这种荧光纳米纤维素水凝胶的形态特征，化学组成和光学性质进行了表征。研究了接触时间和初始浓度对纳米纤维素水凝胶吸附性能的影响。根据实验结果，Fe ³⁺，Ba 2 ⁺，Pb的最大吸附量²⁺和Cu²⁺分别为769、212、2056和1246 mg g^-1。制备的荧光纳米纤维素水凝胶显示出强蓝色荧光，荧光量子产率为23.6％，并且对Fe³⁺的检测具有很高的灵敏度。在这种水凝胶中，用CD修饰的CNF不仅促进了羟基诱导的重金属作为吸附聚集剂的聚集，而且还允许对重金属作为光学传感器做出快速的视觉响应，从而增加了对重金属的吸附能力，并且提高了荧光信号的稳定性和确定重金属浓度的灵敏度。

更新日期：2019-12-04

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