▎ 摘　　要

NOVELTY - A printable gel composition comprises a graphene component, polydopamine, a carrier, and optionally one or more additional polymers chosen from alginates, chitosans, bovine serum albumin (BSA), and their combinations. The polydopamine is non-covalently and/or covalently bound to the graphene component. USE - Printable gel composition used for producing three-dimensional product for removing of portion(s) of contaminant(s) from sample (all claimed) e.g. filtration devices, macroporous adsorbent, flow-through reactor, and water treatment device, and electronics, sensors, biomedicine, catalysis, environmental remediation, supercapacitors, batteries, and thermal devices. ADVANTAGE - The three-dimensional object has high surface area, tunable hydrophobicity, P-P interaction, and easy surface functionalization ability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) three-dimensional product, which comprises a graphene component, polydopamine, and optionally one or more additional polymers chosen from alginates, chitosans, and/or bovine serum albumin (BSA); and (2) removing of portion(s) of contaminant(s) from a sample comprising one or more contaminant(s), which involves contacting the sample with one or more three-dimensional product(s), where one or more or all the contaminant(s) is adsorbed by the three-dimensional product(s).