title: Adsorbent Assisted in Situ Electrocatalysis: An Ultra-Sensitive Detection of As(III) in Water at Fe3O4 Nanosphere Densely Decorated with Au Nanoparticles.
abstract: Most gold nanoparticle-based electrodes have been utilized for the analysis of highly toxic As(III), while nano-Fe3O4 materials are currently attracting considerable interest as an adsorbent for the removal of As(III). However, the combination of gold nanoparticles with Fe3O4 nanoadsorbents for stripping voltammetry is, to the best of our knowledge, unexplored. Here, a sensing interface for ultrasensitive detection of As(III) is designed and constructed by abundantly dispersing Au nanoparticles (Au NPs) on the surface of the Fe3O4 nanosphere. The Au@Fe3O4 nanospheres are covered by the room temperature ionic liquid (RTIL) and then modified on the screen-printed carbon electrode (SPCE). By combining the excellent catalytic properties of the Au nanoparticles (∼3-9 nm in diameter) with the good adsorption capacity of Fe3O4 nanospheres toward As(III), as well as the good conductivity of RTIL, the Au@Fe3O4-RTIL shows excellent performance in the detection of arsenic under nearly neutral conditions without modifying the morphology of the sensing interface. Through optimization of the experimental conditions, an ultrahigh sensitivity of 458.66 μA ppb(-1) cm(-2) from 0.1 to 1 ppb with a detection limit (3σ method) of 0.0022 ppb was obtained. The reproducibility and reliability of the Au@Fe3O4-RTIL sensing interface was also evaluated with good results. Finally, we used this platform to analyze real samples.
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei 230031, People's Republic of China.|Department of Chemistry, University of Science and Technology of China , Hefei 230026, People's Republic of China.
authors.forename: Juan
authors.initials: J
authors.lastname: Wei
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei 230031, People's Republic of China.|Department of Chemistry, University of Science and Technology of China , Hefei 230026, People's Republic of China.
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Li
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei 230031, People's Republic of China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Guo
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei 230031, People's Republic of China.
authors.forename: Xing
authors.initials: X
authors.lastname: Chen
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei 230031, People's Republic of China.
authors.forename: Jin-Huai
authors.initials: JH
authors.lastname: Liu
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei 230031, People's Republic of China.|Department of Chemistry, University of Science and Technology of China , Hefei 230026, People's Republic of China.
authors.forename: Xing-Jiu
authors.initials: XJ
authors.lastname: Huang
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis*; D002384:Catalysis; D055664:Electrochemical Techniques; D006046:Gold / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D058185:Magnetite Nanoparticles; D014867:Water; D006046:Gold; D001151:Arsenic