One-step fabrication of layered double hydroxides/graphene hybrid as solid-phase extraction for stripping voltammetric detection of methyl parathion

We developed a green and facile electrochemical approach to synthesize novel Ni/Al layered double hydroxides decorated graphene nanosheets hybrid (labeled as LDHs-GNs) on a cathodic substrate. The as-prepared LDHs-GNs composite is highly efficient to capture organophosphate pesticides (OPs), combining the advantages of LDHs (high enrichment capability for OPs by a selective intercalation) together with GNs (large surface area and high conductivity). It dramatically facilitates the enrichment of OPs onto their surface and realizes the sensitive stripping voltammetric detection of methyl parathion (MP) as a model of OPs. The detection limit for MP in aqueous solutions was determined to be of 0.6 ng mL(-1) (S/N = 3). This work provides a green and facile route for the preparation of GN-based hybrid, and also offers a new promising protocol for OP analysis. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.