Fig. 5From: Renewable Lignosulfonate-Assisted Synthesis of Hierarchical Nanoflake-Array-Flower ZnO Nanomaterials in Mixed Solvents and Their Photocatalytic Performance a Specific surface areas of ZnO synthesized by SL surfactant, whose amount is presented. b Nitrogen adsorption–desorption isotherms and the corresponding plots of Barrett–Joyner–Halenda (BJH) pore-size distribution for the porous ZnO synthesized with 7 g SLBack to article page