文献类型：期刊文献

英文题名：In-situ polymerization of dendritic polyaniline nanofibers network embedded with Ag@SiO2 core-shell nanoparticles for electrochemical determination of trace arsenic(III)

作者：Feng, Tong[1];Chen, Kaicha[1];Zhong, Jiamiao[1];Cheng, Yaxin[1];Zhao, Hongli[1];Lan, Minbo[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2022

卷号：369

外文期刊名：SENSORS AND ACTUATORS B-CHEMICAL

收录：;EI(收录号：20222812343494);WOS:【SCI-EXPANDED(收录号:WOS:000829232500008)】；

基金：This work was supported by the Science and Technology Commission of Shanghai Municipality, China (STCSM, 20392002300) , and the Fundamental Research Funds for the Central Universities, China (JKJ01221718) .

语种：英文

外文关键词：Arsenic; Ag@SiO2 core-shell nanoparticles; Dendritic polyaniline nanofibers; Screen-printed carbon electrode; Square wave anodic stripping voltammetry

摘要：Arsenic(III) is a highly toxic pollutant in the environment, and the development of nanomaterials with high electrochemical activity for As(III) detection is a research focus at present. Herein, an electrochemical sensing platform based on polyaniline nanofibers embedded with Ag@SiO2 nanoparticles (Ag@SiO2/PANI NFs) was successfully constructed for trace As(III) determination. Owing to an in-situ chemical oxidation polymerization strategy, the polyaniline nanofibers loaded with Ag@SiO2 core-shell nanoparticles blossomed into the dendritic three-dimensional network. The unique structure with a huge specific surface area greatly enhanced the adsorption efficiency of As(III). Combined with the outstanding conductivity of polyaniline and the electrocatalytic ability of uniformly dispersed AgNPs, the stripping current signal of As(III) was further amplified. Based on the optimized conditions, the sensitivity of 0.83 mu A mu g(-1) L was obtained in the linear range of 0.1 similar to 100 mu g L-1 with a low detection limit of 0.013 mu g L-1. And the selectivity, reproducibility, and long-term stability of this sensor were excellent. Additionally, satisfactory results were achieved by the recovery experiment of real samples, and the accuracy of this method was verified by comparison with ICP-MS. The above results demonstrated the promising application of the as-fabricated sensor in As(III) detection.