Fig. 8From: Removal and extraction efficiency of Quaternary ammonium herbicides paraquat (PQ) from aqueous solution by ketoenol–pyrazole receptor functionalized silica hybrid adsorbent (SiNPz)Intra-particle diffusion model plots for the adsorption of paraquat by SiNPz (experimental conditions: 10 mL sample volume, 100 mg SiNPz, and 20.0 mg L−1)Back to article page