Homogeneous synthesis of chitin-based acrylate superabsorbents in NaOH/urea solution

► Chitin was dissolved in NaOH/urea solution and directly involved in synthesis reaction. ► Chitin based superabsorbent was synthesized under homogeneous conditions with better water absorption properties. ► Acrylic acid used directly without prior neutralization with NaOH. ► The polymerization reaction can carry out in a small beaker without nitrogen protection. ► Products exist as hydrogel without excess reagent emissions, which is conducive to reducing the environmental pollution.