Fig. 3From: Carbonized lignosulfonate-based porous nanocomposites for adsorption of environmental contaminantsSEM images and elemental maps (where carbon is represented in red, oxygen in green, and sulfur in blue) of non-functionalized nGO1-Gel1 (1–6) and lignosulfonate (LS)-functionalized nGO1-Gel1-LS0.1 (7–12) composites and their surface and cross-sectional elemental compositionsBack to article page