The chemical reagents include natural graphite powder (200 mesh, UniRegion Bio-Tech, Hsinchu, Taiwan),
zinc nitrate hexahydrate (99%, Alfa Aesar, Haverhill, MA, USA),
ferric nitrate nonahydrate (98%, Sigma-Aldrich, St. Louis, MO, USA), sodium hydroxide (95%, Nihon Shiyaku Reagent, Kyoto, Japan), sulfuric acid (99.99%, Nihon Shiyaku Reagent, Kyoto, Japan), acetone (95%, Nihon Shiyaku Reagent, Kyoto, Japan), hydrochloric acid (37%, Union Chemical, Hsinchu, Taiwan), potassium permanganate (99.3%, Union Chemical, Hsinchu, Taiwan), sodium nitrate (99.5%, Hayashi Pure Chemical Ind, Osaka, Japan), hydrogen peroxide (30%, Showa Chemical, Tokyo, Japan), and methylene blue (99%, Koch-Light Laboratories, Ltd., Haverhill, Suffolk, UK). GO was prepared via modified Hummer’s method. The purity of the chemicals used in this experiment is of analytical grade, and they were used directly without any treatment.
Wang E.R, & Shih K.Y. (2021). Facile Microwave Hydrothermal Synthesis of ZnFe2O4/rGO Nanocomposites and Their Ultra-Fast Adsorption of Methylene Blue Dye. Materials, 14(18), 5394.