▎ 摘　　要

NOVELTY - Ionic liquid-coated aminosilanated magnetic graphene oxide nanocomposite is prepared by (i) preparing magnetic graphene oxide from graphene oxide, ferric chloride hexahydrate, and ferrous chloride tetrahydrate in alkaline solution, (ii) preparing aminosilanized magnetic graphene oxide from magnetic graphene oxide, ethyl orthosilicate, and 3-aminopropyltriethoxysilane in ethanol, and (iii) preparing aminosilanized magnetic graphene oxide coated with magnetic adsorbent ionic liquid from 1-hexyl-3-methyl-1H imidazole-3-hexafluorophosphate and aminosilanated magnetic graphene oxide in methanol. USE - The ionic liquid-coated aminosilanated magnetic graphene oxide nanocomposite is useful for detecting heavy metals in shellfish (claimed). ADVANTAGE - The method can extract and enrich trace amounts of target heavy metal elements under the interference of the sample substrate, and exhibits excellent adsorption performance in multiple cycles, optimizes the main influencing factors that affect the adsorption and desorption of target heavy metal ions, meets the requirements of high sensitivity and high accuracy, and provides a new method for the detection of three target ions in shellfish. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the ionic liquid-coated aminosilanated magnetic graphene oxide nanocomposite involving (i) dispersing the graphene oxide powder in distilled water, mechanically stirring under the protection of nitrogen, and heating in a water bath, dissolving ferric chloride hexahydrate and ferrous chloride tetrahydrate in distilled water to obtain a solution, when the temperature of the water bath rises to 70-80 degrees C, adding the solution to the dispersion and vigorously stirring, adding sodium hydroxide solution to adjust the pH of the suspension, and mechanically stirring at 70-80 degrees C for 60-120 minutes to obtain magnetic graphene oxide, (ii) dispersing the ethyl orthosilicate in distilled water, stirring, and ultrasonically treating to obtain a uniform suspension, dispersing the graphene oxide in absolute ethanol, adding the above homogeneous suspension in an ice bath at 0-4 degrees C, vigorously stirring, adding sodium hydroxide solution to adjust the pH of the suspension, continuously reacting at 0-4 degrees C for 10-14 hours, separating the magnetic material and drying, adding the above product to absolute ethanol, protecting with nitrogen, mechanically stirring, adding (3-aminopropyl)triethoxysilane (APTES), and continuously stirring for 4-8 hours to obtain aminosilanated magnetic graphene oxide, and (iii) adding the aminosilanized magnetic graphene oxide and 1-hexyl-3-methyl-1H-imidazole-3-hexafluorophosphate into 10-75 ml methanol, and ultrasonically treating to obtain aminosilanized magnetic graphene oxide coated with ionic liquid; and (2) use of ionic liquid-coated aminosilanated magnetic graphene oxide nanocomposite for detecting heavy metals in shellfish.