▎ 摘　　要

The composite of metal-organic frameworks (MOFs) and graphene aerogels (GAs) is getting growing attention in the field of electrochemical sensor owing to its interconnected meso-/macro-porous structure, high conductivity, and large surface area. How to effectively compound the two components in a simple way and maximize the performance advantages of materials is still a challenge. In this paper, a simple in-situ growth method was proposed by using polypyrrole (PPy) as a crosslinking agent for the synthesis of hierarchically porous PPy@ZIF-8/GAs. Wherein, PPy was initially decorated on GAs and then ZIF-8 nanocrystals were orderly grown on the surface of PPy/GAs through the coordination interaction between Zn2+ and amino (-NH-) groups in PPy chains. This hybrid 3D architecture provided open channels for electrolyte transportation and improved electron transfer between the electrode and the catalysts, which was exploited as electrochemical sensing platform for the detection of highly toxic 2, 2-methylenebis (4-chlorophenol) (dichlorophenol, Dcp). Benefiting from the synergistic effects between PPy, GAs and ZIF-8, the PPy@ZIF-8/GAs electrode showed high sensitivity for Dcp detection with a low detection limit down to 0.1 nM. In addition, the current sensor presented several merits, such as good reproducibility, high selectivity and long stability. More importantly, the sensor was successfully applied for the detection of Dcp in lake water samples. (C) 2019 Elsevier Ltd. All rights reserved.