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Mesoporous materials,such as Mesoporous Mobil catalytic materials of number 41 silica materials(MCM-41),are attractive for applications to the adsorption and isolation of natural products.In this paper,a new type of MCM-41 material was synthesized by surface modification with an ionic liquid and compared the ability of MCM-41,NH2-MCM-41,Im-MCM-41,and NH2-IL-MCM-41 to adsorb two target compounds,alginate and fucoidan.Among the four MCM-41 series,NH2-MCM-41 showed the best adsorption of the target compounds.Under the optimized conditions of the solvent of water and pH 7.0,68.50 mg/g and 43.70 mg/g of alginate and fucoidan were obtained in 30 and 60 min,respectively.Among the adsorption isotherm models,the Langmuir-Freundlich isotherm was found to be the optimal isotherm for this study.The regression coefficient(r2)of the competitive Langmuir-Freundlich isotherm for alginate and fucoidan was 0.9887 and 0.9908.