Sensitive sensing of Hg(II) based on lattice B and surface F co-doped CeO2: Synergies of catalysis and adsorption brought by doping site engineering

Zheng Liu; Xu Xia; Chun-Jie Ye; Huan Xu; Qiu-Yu Wang; Zi-Yi Zheng; Shan-Shan Li; Zhonggang Liu; Zheng Guo

doi:10.1016/j.aca.2023.341937

Sensitive sensing of Hg(II) based on lattice B and surface F co-doped CeO₂: Synergies of catalysis and adsorption brought by doping site engineering

Anal Chim Acta. 2023 Nov 22:1282:341937. doi: 10.1016/j.aca.2023.341937. Epub 2023 Oct 19.

Authors

Zheng Liu¹, Xu Xia¹, Chun-Jie Ye¹, Huan Xu¹, Qiu-Yu Wang¹, Zi-Yi Zheng¹, Shan-Shan Li², Zhonggang Liu³, Zheng Guo⁴

Affiliations

¹ Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Anhui Province Key Laboratory of Intelligent Computing and Applications, Anhui Province Industrial Generic Technology Research Center for Alumics Materials, School of Physics and Electronic Information, Huaibei Normal University, Huaibei, 235000, PR China.
² Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Anhui Province Key Laboratory of Intelligent Computing and Applications, Anhui Province Industrial Generic Technology Research Center for Alumics Materials, School of Physics and Electronic Information, Huaibei Normal University, Huaibei, 235000, PR China. Electronic address: sa157002@mail.ustc.edu.cn.
³ Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei, 230000, PR China. Electronic address: zhgliu@ahu.edu.cn.
⁴ Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei, 230000, PR China. Electronic address: zhguo@ahu.edu.cn.

PMID: 37923410
DOI: 10.1016/j.aca.2023.341937

Abstract

Transition metal oxides are widely used in the detection of heavy metal ions (HMIs), and the co-doping strategy that introducing a variety of different dopant atoms to modify them can obtain a better detection performance. However, there is very little research on the co-doped transition metal oxides by non-metallic elements for electrochemical detection. Herein, boron (B) and fluorine (F) co-doped CeO₂ nanomaterial (BFC) is constructed to serve as the electrochemically sensitive interface for the detection of Hg(II). B and F affect the sensitivity of CeO₂ to HMIs when they were introduced at different doping sites. Through a variety of characterization, it is proved that B is successfully doped into the lattice and F is doped on the surface of the material. Through the improvement of the catalytic properties and adsorption capacity of CeO₂ by different doping sites, this B and F co-doped CeO₂ exhibits excellent square wave anodic stripping voltammetry (SWASV) current responses to Hg(II). Both the high sensitivity of 906.99 μA μM^-1 cm^-2 and the low limit of detection (LOD) of 0.006 μM are satisfactory. Besides, this BFC glassy carbon electrode (GCE) also has good anti-interference property, which has been successfully used in the detection of Hg(II) in actual water. This discovery provides a useful strategy for designing a variety of non-metallic co-doped transition metal oxides to construct trace heavy metal ion-sensitive interfaces.

Keywords: Adsorption; B and F co-doping CeO(2); Hg(II); Redox; Transition metal oxides.