“…[33][34][35] This method succeeded in preparing many nanomaterials such as a-Fe 2 O 3 , CuO/Li 3 BO 3 , La 0.8 Sr 0.2 -FeO 3 , Co 2 SiO 4 , Bi 2 ZnB 2 O 7 , CoAl 2 O 4 , Gd 2 CoMnO 6 , and Co 3 O 4 . [36][37][38][39][40][41][42][43] However, the world needs more low-cost nanomaterials to get rid of the problem of water pollution. To achieve this goal, our research group has synthesized MgMn 2 O 4 /Mn 2 O 3 and MgMn 2 O 4 /Mn 2 O 3 /Mg 6 MnO 8 as novel nanostructures using the Pechini sol-gel method.…”