One-Step Synthesis of TiN/C Nanocomposites for the Sensitive Determination of Ofloxacin

Abstract

Regulating the heterostructure of electrode materials has a great influence on electron migration and subsequent electrochemical reactions, which play a critical role in the sensing process. Herein, a facile method has been demonstrated to synthesize TiN/graphitic carbon (TiN/gC) nanocomposites by the in situ growth of TiN nanoparticles on C nanosheets. The formation of TiN/gC heterojunctions was evidenced by X-ray diffraction, Raman microscopy, and transmission electron microscopy. This heterostructure can effectively facilitate electron transfer and increase the electrochemically active area, which improves the electrocatalytic performance. Interestingly, the TiN/gC-modified glassy carbon electrode (TiN-gC/GCE) exhibited excellent electrocatalytic activity toward ofloxacin (OFLX) redox. With the change in the OFLX concentration, the electrochemical response of the sensor also changes. By using a differential pulse voltammetry (DPV) technique, the designed sensor showed a wide detection range: the DPV response was linearly dependent on the concentrations in the range of 0.051.0 and 1.0100 μM. Moreover, TiN-gC/GCE demonstrated outstanding analytical performances in the quantitative OFLX assay, such as a high sensitivity of 2876 µAmM−1cm−2, low detection limit of 0.016 μM, good selectivity and stability. The proposed method was successfully applied for OFLX detection in eye drops and environmental water with satisfactory results.

The enrichment of 7Li by extraction with a Sudan I-Ionic liquid system

“…The ( 7Li/ 6 Li) sample is the ratio of 7 Li to 6 Li of the measured sample, and the ( 7 Li/ 6 Li) Standard is the 7 Li to 6 Li of the standard L-SVEC. d 7 Li 4 0 indicates that the sample is enriched in 7 Li to the standard, while d 7 Li o 0 indicates that the sample is enriched in 6 Li to the standard value is larger, the higher the abundance of 7 Li, and vice versa. Isotope data analysis error within 3 parts per thousand.…”

“…where ([ 7 Li]/[ 6 Li]) org denotes the abundance ratio of 7 Li and 6 Li in the organic phase, and ([ 7 Li]/[ 6 Li]) aq denotes the abundance ratio of 7 Li and 6 Li in the aqueous phase. When a 4 1, the system is enriched with 7 Li; when a = 1, the system does not have a separation effect; and when a o 1, the system is enriched with 6 Li.…”

“…There are two stable isotopes of lithium in nature, 6 Li and 7 Li, which have natural abundances of about 7.5% and 92.5%. 1,2 The two lithium isotopes have completely different nuclear reactivity 3 and are essential to nuclear industry applications.…”

“…However, 7 Li with an abundance change to 99.99% can only be used as an acidbase moderator in pressurized water reactors (PWRs), whereas higher 7 Li abundances are required in fusion reactors. [5][6][7] The separation process is further complicated because 7 Li and 6 Li are chemically similar. Currently, lithium amalgamation is the only industrialized method.…”

From Fundamentals to Next-Generation Technology - JES/JSS Focus Issue In Honor of John Goodenough: A Centenarian Milestone

“…In a more retrospective contribution, Coey, Givord, and Fruchart 18 review the interesting series of magnetic phase transformations and associated functional effects in the metallic nitride and carbide perovskites and suggest that a revisit of this class of materials may yield new types of phenomena and applications. Looking towards quantum-type materials, Wang and Chang 19 apply the tenets of the GKA rules to the recently discovered 2D van der Waals (vdW) magnetic systems, and in particular investigate interlayer coupling in CrI 3 /MoTe 2 /CrI 3 vdW heterostructures.…”