Colorimetric detection of Cr (VI) based on the leaching of gold nanoparticles using a paper-based sensor

Jian-Feng Guo; Dan-Qun Huo; Mei Yang; Chang-Jun Hou; Jun-Jie Li; Huan-Bao Fa; Hui-Bo Luo; Ping Yang

doi:10.1016/j.talanta.2016.09.032

Colorimetric detection of Cr (VI) based on the leaching of gold nanoparticles using a paper-based sensor

Talanta. 2016 Dec 1:161:819-825. doi: 10.1016/j.talanta.2016.09.032. Epub 2016 Sep 12.

Authors

Jian-Feng Guo¹, Dan-Qun Huo², Mei Yang³, Chang-Jun Hou⁴, Jun-Jie Li¹, Huan-Bao Fa⁵, Hui-Bo Luo⁶, Ping Yang⁷

Affiliations

¹ Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China.
² Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China. Electronic address: [email protected].
³ Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China. Electronic address: [email protected].
⁴ Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China; National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology, Chongqing University, Chongqing 400044, China.
⁵ College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
⁶ Liquor Making Bio-Technology & Application of Key Laboratory of Sichuan Province, Zigong 643000, China.
⁷ National Engineering Research Center of Solid-State Brewing, Luzhou Laojiao Group Co. Ltd., Luzhou, Sichuan 646000, China.

PMID: 27769488
DOI: 10.1016/j.talanta.2016.09.032

Abstract

Herein, we have developed a simple, sensitive and paper-based colorimetric sensor for the selective detection of Chromium (Ⅵ) ions (Cr (VI)). Silanization-titanium dioxide modified filter paper (STCP) was used to trap bovine serum albumin capped gold nanoparticles (BSA-Au NPs), leading to the fabrication of BSA-Au NPs decorated membrane (BSA-Au NPs/STCP). The BSA-Au NPs/STCP operated on the principle that BSA-Au NPs anchored on the STCP were gradually etched by Cr (VI) as the leaching process of gold in the presence of hydrobromic acid (HBr) and hence induced a visible color change. Under optimum conditions, the paper-based colorimetric sensor showed clear color change after reaction with Cr (VI) as well as with favorable selectivity to a variety of possible interfering counterparts. The amount-dependent colorimetric response was linearly correlated with the Cr (VI) concentrations ranging from 0.5µM to 50.0µM with a detection limit down to 280nM. Moreover, the developed cost-effective colorimetric sensor has been successfully applied to real environmental samples which demonstrated the potential for field applications.

Keywords: Colorimetric; Cr (VI); Gold nanoparticles; Non-aggregation; Paper-based.