Acidophilic S-doped carbon quantum dots derived from cellulose fibers and their fluorescence sensing performance for metal ions in an extremely strong acid environment

Guanghui Yang; Xuejuan Wan; Yikun Su; Xierong Zeng; Jiaoning Tang

doi:10.1039/C6TA05943K

Acidophilic S-doped carbon quantum dots derived from cellulose fibers and their fluorescence sensing performance for metal ions in an extremely strong acid environment†

Guanghui Yang,‡^ab Xuejuan Wan,‡*^a Yikun Su,^a Xierong Zeng^a and Jiaoning Tang*^a

* Corresponding authors

^a Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China
E-mail: wanxj@szu.edu.cn, tjn@szu.edu.cn

^b Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, PR China

Abstract

To achieve a rapid qualitative and quantitative evaluation of the total soluble heavy metal contamination in an aquatic environment, acidophilic fluorescent sensors with excellent metal ion detection capacity in strong acid (pH < 2) solutions require development. In this study, novel S-doped carbon quantum dots (S-CQDs) are synthesized from widely available cellulose fibers as carbon precursors and sulfuric acid as the carbonization agent and dopant. The S-CQDs exhibit extremely acidophilic high luminescence and a high quantum yield (up to 32%) in strong acid solutions. More importantly, the as-prepared S-CQDs are successfully utilized to detect Fe³⁺ in pH 0 solutions with excellent selectivity and sensitivity, with a detection limit as low as 0.96 μM. Based on the results, this study provides a foundation for the development of CQD sensors that can be used under strong acid conditions.

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DOI: https://doi.org/10.1039/C6TA05943K
Article type: Paper
Submitted: 14 Jul 2016
Accepted: 20 Jul 2016
First published: 21 Jul 2016

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J. Mater. Chem. A, 2016,4, 12841-12849

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Acidophilic S-doped carbon quantum dots derived from cellulose fibers and their fluorescence sensing performance for metal ions in an extremely strong acid environment

G. Yang, X. Wan, Y. Su, X. Zeng and J. Tang, J. Mater. Chem. A, 2016, 4, 12841 DOI: 10.1039/C6TA05943K

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Journal of Materials Chemistry A

Acidophilic S-doped carbon quantum dots derived from cellulose fibers and their fluorescence sensing performance for metal ions in an extremely strong acid environment†

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Acidophilic S-doped carbon quantum dots derived from cellulose fibers and their fluorescence sensing performance for metal ions in an extremely strong acid environment

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