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Chitosan-gold nano-composite and its functionalized paper-strips for reversibly visual sensing and removal of trace Hg2+ in practice

yanzhengquan 添加于 2018/11/14 15:21:07  255次阅读 | 0次推荐 | 0个评论

To eliminate mercury contamination in aqueous environment, chitosan-gold nano composite and its functionalized paper-strips were identified and developed for visual sensing and removal of trace Hg2+. Just by immersing common filter-paper into the resultant composite dispersion, gold nano chromophores could disperse well with little aggregation by virtue of the double supporting roles of chitosan and filter- 10 paper. Under the optimized conditions, both chitosan-gold nano composite and its functionalized paperstrips could change exclusively from dark red to yellow upon addition of Hg2+ with a detection limit of 3.2 ×10−9 mol·L−1 and 5.0 ×10−8 mol·L−1 respectively. Importantly, chitosan-gold nano composite was non-toxic and could be utilized repeatedly for sensing trace Hg2+ both in environmental aqueous and some fruit or vegetable juice samples with satisfactory results. What’s more, using the resulting 15 functionalized filter-paper, more than 93.5 % Hg2+ in aqueous with initial concentration as high as 1.0 ×10−5 mol·L−1 could be enriched and separated by a simple filtration process. The action mechanism was proposed on the reversible gold amalgam between gold nano particles and Hg2+. This work will be the first report for paper-based sensing to visually detect, enrich and remove Hg2+ with little secondary pollution.

作 者:Lei Hu, Baohui Zhu, Li Zhang, Hua Yuan, Qi Zhao, Zhengquan Yan*
期刊名称: Analyst
期卷页: 2019 第144卷 第期 C8AN01707G页
学科领域:化学科学 » 分析化学 » 光谱分析
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原文链接:https://pubs.rsc.org/en/content/articlelanding/2018/an/c8an01707g#!divAbstract
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