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The pineapple peel cellulose(PPC) was used as raw material to dissolve in an alkali/urea solution with incorporation of bentonite, then further chemically cross-linked and in-situ embedded with magnetic Fe3O4 to form composite hydrogels. The structure and dye adsorption properties of hydrogels were studied. The results confirmed the successful intercalation of bentonite and Fe3O4 in the hydrogels. The bentonite effectively improved the cross-linked porous network structure, thermal stability and swelling properties of the hydrogel. The bentonite also enhanced the methylene blue adsorption performance of the hydrogels, showing an increased saturated adsorption capacity from 28. 09 mg/g to 55. 87 mg/g. The adsorption process conformed to the pseudo-second-order kinetic model and Langmuir model, belonging to chemical adsorption and monolayer adsorption. [ABSTRACT FROM AUTHOR]