**6.2 Sensitive response to H2O2 detection**

Acetylated xylan-based magnetic Fe3O4 nano-composite hydrogels were prepared by fabricating Fe3O4 particles within a hydrogel matrix. The hydrogel matrix was synthesized by graft copolymerization reaction of acetylated xylan (porous nature of hydrogels were increased by introducing the acetyl functional group) with acrylamide and N-isopropylacrylamide under ultraviolet irradiation. The magnetic hydrogels were accessible to excellent catalytic activity and provided a sensitive response to H2O2 detection even at low concentration. The approach to prepare magnetic hydrogels endows with promising applications in the field of environmental chemistry [28].
