N-doped carbon dots/H2O2 chemiluminescence system for selective detection of Fe2+ ion in environmental samples

Publication date: 1 May 2019

Source: Talanta, Volume 196

Author(s): Syed Niaz Ali Shah, Xiangnan Dou, Mashooq Khan, Katsumi Uchiyama, Jin-Ming Lin

Abstract

The nitrogen doped carbon dots (N-CDs) produces strong chemiluminescence (CL)-emission due to hydroxyl radical (^•OH) induced electron-hole transition in N-CDs. The Fe²⁺ has the ability to generate ^•OH from available hydrogen peroxide (H₂O₂). Therefore, a pre-mixed N-CDs/H₂O₂ solution was utilized for selective quantification of Fe²⁺ in solution via CL-emission. A linear increase in the CL-emission intensity was observed within increase in Fe²⁺ concentration. The N-CDs/H₂O₂ system enabled the detection of Fe²⁺ up to lower concentration of 0.2 × 10⁻⁹ M with a linear dynamic range of 1.0 × 10⁻⁹–1.0 × 10⁻⁶ M. Significantly, no CL-emission was observed when other divalent cations, Al³⁺, Fe³⁺, or Cr³⁺ were injected to this system. Moreover, no interference was observed when a mixed solution of Fe²⁺ and other cations were introduced to N-CDs/H₂O₂. The practical evaluation of N-CDs/H₂O₂ system was demonstrated for detection of Fe²⁺ in tap, lotus pond, and canal water samples. The easy detection, high sensitivity, and selectivity make this method a significant tool for analysis of Fe²⁺ in solution.

Graphical abstract

The N-CDs enhanced Fenton system was used for the sensitive and selective determination of Fe²⁺ ion in the presence of various cations and anions.

from A via a.sfakia on Inoreader http://bit.ly/2SxT0dS