Thiolated poly(aspartic acid)-functionalized two-dimensional MoS2, chitosan and bismuth film as a sensor platform for cadmium ion detection

Qiang Cao; Yushi Xiao; Rong Huang; Na Liu; Hai Chi; Cheng-Te Lin; Chi-Hsien Huang; Gang Han; Lidong Wu

doi:10.1039/d0ra06197b

Thiolated poly(aspartic acid)-functionalized two-dimensional MoS₂, chitosan and bismuth film as a sensor platform for cadmium ion detection

RSC Adv. 2020 Oct 14;10(62):37989-37994. doi: 10.1039/d0ra06197b. eCollection 2020 Oct 12.

Authors

Qiang Cao^{1

2}, Yushi Xiao^{1

2}, Rong Huang^{1

3}, Na Liu^{1

2}, Hai Chi⁴, Cheng-Te Lin⁵, Chi-Hsien Huang⁶, Gang Han¹, Lidong Wu¹

Affiliations

¹ Key Laboratory of Control of Quality and Safety for Aquatic Products, Chinese Academy of Fishery Sciences Beijing 100141 China [email protected] +86-10-68690712 +86-10-68690712.
² Shanghai Ocean University Shanghai 201306 China.
³ Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University (BTBU) Beijing 100048 China.
⁴ East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences Shanghai 201306 China.
⁵ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo 315201 China.
⁶ Department of Materials Engineering, Mingchi University of Technology 243303 Taiwan.

Abstract

In this work, a sensitive electrochemical platform for determination of cadmium ions (Cd²⁺) is obtained using thiolated poly(aspartic acid) (TPA)-functionalized MoS₂ as a sensor platform by differential pulse anodic stripping voltammetry (DPASV). The performance of the TPA-MoS₂-modified sensor is systemically studied. It demonstrates that the TPA-MoS₂ nanocomposite modified sensor exhibits superior analytical performance for Cd²⁺ over a linear range from 0.5 μg L^-1 to 50 μg L^-1, with a detection limit of 0.17 μg L^-1. Chitosan is able to form a continuous coating film on the surface of the GC electrode. The good sensing performance of the TPA-MoS₂-modified sensor may be attributed to the following factors: the large surface area of MoS₂ (603 m² g^-1), and the abundant thiol groups of TPA. Thus, the TPA-MoS₂-modified sensor proves to be a reliable and environmentally friendly tool for the effective monitoring of Cd²⁺ existing in aquacultural environments.