▎ 摘　　要

NOVELTY - Three dimensional-printed composite comprises polylactic acid, graphite and graphene oxide. USE - The three dimensional-printed composite is useful in electrode for detecting heavy metal ions (all claimed). ADVANTAGE - The three dimensional-printed composite improves heavy metal detection sensitivity and detection limits can be obtained, can selectively or simultaneously detect 5 types of heavy metal ions present in industrial water or groundwater, so it can be very useful for on-site analysis, effective in detecting trace amounts of heavy metal elements, and provides many alternatives because they can replace conductive materials such as metals. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: electrode for detecting heavy metal ions comprising the 3D-printed composite for detecting heavy metal ions; manufacturing an electrode for detecting heavy metal ions comprising (a) stirring and evaporating the solvent in which the complex is mixed and then drying under vacuum conditions, (b) grinding the dried mixture, (c) discharging the pulverized mixture at a high temperature using a filament extractor and (d) 3D-printing the generated filament into a disk; heavy metal ion detection sensor comprising heavy metal ion detection electrode; and heavy metal ion detection method comprising (i) pre-treating heavy metal ion detection electrode in an acidic solution and (ii) processing a sample on the pretreated electrode