Sensitive detection of Au(III) using regenerative rhodamine B-functionalized chitosan nanoparticles

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• 作者：Jinshui Liu ; ^{jsliu@sina.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Wenxiu LiuAuthor Vitae ; Meijiao XuAuthor Vitae ; Bin WangAuthor Vitae ; Zihan ZhouAuthor Vitae ; Lizhen WangAuthor Vitae
• 关键词：Fluorescent probe ; Removal ; Rhodamine B ; Chitosan
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：5 October 2016
• 年：2016
• 卷：233
• 期：Complete
• 页码：361-368
• 全文大小：1515 K

文摘

Chitosan nanoparticles functionalized with rhodamine B (called RB–CSN) were synthesized. Au(III) was adsorbed onto the surfaces of the RB–CSN through electrostatic interactions between the AuCl₄⁻ and the protonated amino groups in the RB–CSN. The nanoparticles with AuCl₄⁻ adsorbed onto them were easily separated from water by centrifugation. The maximum adsorption capacity of the RB–CSN was about 0.33 mmol/g. The self-assembled AuCl₄⁻ ions were adsorbed in very close proximities to the RB moieties in the RB–CSN, and this caused photo-induced electron transfer from the RB to the AuCl₄⁻ to occur efficiently. This meant that changes in the fluorescence of the RB–CSN were able to be used to determine the AuCl₄⁻ concentration more sensitively than were changes in the fluorescence of free RB. Under optimal conditions, the dynamic range over which RB–CSN can be used to detect Au(III) was 1.9 × 10⁻⁷ mol L⁻¹ to 4.75 × 10⁻⁵ mol L⁻¹. The detection limit was 1.52 × 10⁻⁸ mol L⁻¹. The dual-functional RB–CSN material can be completely regenerated using a solution of 0.5 M thiourea and 0.1 M HCl. The reusable dual-functional material that was able to be used to both detect dissolved Au(III) and remove Au(III) from an aqueous solution.