Mesoporous SiO2 and ZnO•SiO2 composite (10 wt.% of SiO2) were prepared from rice husk for removal of organic dye (Janus Green B, JGB). As-prepared samples were characterized by XRD, FE-SEM, FT-IR, and N2 adsorption/desorption isotherms. | Preparation of mesoporous SiO2 and ZnO•SiO2 composite from raw rice husk for removal of organic dye