Sensitive and anti-interference stripping voltammetry analysis of Pb(II) in water using flower-like MoS2/rGO composite with ultra-thin nanosheets

Yu-Feng Sun; Jian-Hua Sun; Jian Wang; Zong-Xin Pi; Lian-Chao Wang; Meng Yang; Xing-Jiu Huang

doi:10.1016/j.aca.2019.03.008

Sensitive and anti-interference stripping voltammetry analysis of Pb(II) in water using flower-like MoS₂/rGO composite with ultra-thin nanosheets

Anal Chim Acta. 2019 Jul 31:1063:64-74. doi: 10.1016/j.aca.2019.03.008. Epub 2019 Mar 9.

Authors

Yu-Feng Sun¹, Jian-Hua Sun¹, Jian Wang¹, Zong-Xin Pi², Lian-Chao Wang³, Meng Yang⁴, Xing-Jiu Huang⁵

Affiliations

¹ Key Lab for High Performance Nonferrous Metals of Anhui Province, Anhui Polytechnic University, Wuhu, Anhui, 241000, PR China.
² Department of Chemical and Chemical Engineering, Hefei Normal University, Hefei, 230001, PR China. Electronic address: 18955150893@189.cn.
³ School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230031, PR China. Electronic address: hfutwlc@163.com.
⁴ Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, PR China. Electronic address: myang@iim.ac.cn.
⁵ Key Lab for High Performance Nonferrous Metals of Anhui Province, Anhui Polytechnic University, Wuhu, Anhui, 241000, PR China; Key Laboratory of Environmental Optics and Technology, And Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, PR China.

PMID: 30967187
DOI: 10.1016/j.aca.2019.03.008

Abstract

Herein, combined with the outstanding adsorption ability of flower-like MoS₂ with ultra-thin nanosheets and the good electrical conductivity of reduced graphene oxide (rGO), a sensitive and anti-interference electrochemical sensing interface for the analysis of Pb(II) was constructed by using MoS₂/rGO nanocomposite modified glassy carbon electrode (MoS₂/rGO-GCE). The stripping behavior of Pb(II) was estimated using square wave anodic stripping voltammetry (SWASV), a high sensitivity of 50.80 μA μM^-1 was achieved, and the limit of detection (LOD) was determined to be 0.005 μM (3σ method). The reasons for the excellent electrochemical performance of MoS₂/rGO-GCE toward Pb(II) is that the excellent adsorption capacity and electrical conductivity, and the redox reaction of Pb(II) occurs directly on the surface of the MoS₂/rGO nanocomposite. Moreover, series interference experiments were systematically conducted, the sensitivity of Pb(II) has no obvious change in the presence of other coexist heavy metal ions. In addition, an intriguing interference phenomenon between Pb(II) and Cu(II) was found. When Cu(II) exists in the solution, two stripping peaks of Pb(II) were observed, this phenomenon can be explained that the form of PbCu alloy or intermetallic compounds during the preconcentration process. Further experiments indicated that the proposed method has good stability and reproducibility. Finally, the accurate detection result of Pb(II) in wastewater sample gathered from Wangxiaoying wastewater treatment plant were obtained.

Keywords: Adsorption capacity; MoS(2)/rGO nanocomposite; Pb(II); Sensitive and anti-interference; Stripping voltammetry.