Two-dimensional molecular imprinting approach for the electrochemical detection of trinitrotoluene

摘要

In this work, we demonstrated a sensitive and selective electrochemical sensing protocol for the detection of TNT prepared from alkanethiols self-assembled on AuNPs modified glassy carbon (GC) electrode with preadsorbed templates of TNT. It demonstrated that the 2D molecular imprinting monolayer: (MIMs) can provide a better site accessibility and lower mass-transfer resistance, while the AuNPs car enhance electrode conductivity, facilitate the electron transfer and increase the amount of TNT-imprintec sites. The prepared sensor showed not only high selectivity toward TNT in comparison to other similai nitroaromatic compounds (NACs), but also a wide linear range over TNT concentration from 4.0 x 1CH to 3.2 x 10~(-6) M with a detection limit of 1.3 x 1(H M (S/N = 3). Moreover, the imprinted sensor has beer applied to the determination of TNT in spiked environmental water samples and shows promise for fasi and sensitive measurement of trace levels of TNT in real samples.