“…Therefore, conversion of nitrophenol into other chemicals such as para -aminophenol is highly beneficial as these chemicals can be used as starting materials for industrial dyes, photography development agents, rubber chemicals, and so forth. ,− While there are recent attempts to design and develop catalysts for the purpose based on environmental friendly, cost-effective, and high-performance materials, catalysts based on noble metals, such as Au, Pd, Pt, Ag, and so forth, have been studied for a long time to convert para -nitrophenol to para -aminophenol. − ,,− Realizing that the noble metals are expensive, which exhibit sintering and related problems at the nanoscale dimensions, many researchers directed their recent efforts to design and develop various other catalysts, which are based on inexpensive, green, and highly stable metal oxides and/or composites, for the para -nitrophenol reduction reaction. ,,,− However, the catalytic studies on the hard magnetic materials such as barium- and strontium-hexaferrites and their derivatives are yet to be explored. On the other hand, based on our previous work on magnetic and electronic materials, , we recognize that tailoring the materials’ structure and controlled phase in nanostructured materials can provide opportunities to design inexpensive nanomaterials for the desired applications. Furthermore, most recently, we demonstrated that the surface/interface magnetic properties can be tailored and have made successful attempts to derive catalytic properties in Cu-substituted strontium hexaferrites synthesized using a tartrate-gel method. , Therefore, in the present study, Al is chosen for the substitution in place of Fe in SrFe 12 O 19 and evaluated its activity toward the nitrophenol reduction reaction.…”