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Abstract In order to reduce pesticide residues and improve the adsorption capacity of mesoporous silicon. Amino-modified mesoporous silicon (NH2-MCM-41) and salicylaldehyde-modified mesoporous silicon (Sal-MCM-41) were prepared by a one-step method. Salicylaldimine-modified mesoporous silica supported metal ions (Zn2+-Sal-MCM-41, Cu2+-Sal-MCM-41 and Mn2+-Sal-MCM-41) and NH2-MCM-41 adsorbed the model drug acetamiprid, which builded an acetamiprid/NH2-MCM-41 and an acetamiprid/metal ion-Sal-MCM-41 composite system. The structure of mesoporous silicon was characterized by infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and nitrogen adsorption desorption (BET). Learning and thermodynamics explored the adsorption behavior of mesoporous silicon. The results show that the two modified mesoporous silicas have an ordered structure. The adsorption capacity of MCM-41 on acetamiprid was 0.091 g/g, and the adsorption capacity of Mn2+-Sal-MCM-41 was 0.161 g/g. The adsorption kinetics and adsorption thermodynamics of MCM-41 before and after modification on acetamiprid were in accordance with the quasi-first-order kinetic model and the Freundlich model. After the modified mesoporous silicon was loaded with metal ions, the adsorption amount of the model pesticide acetamiprid increases, which can increase the role of mesoporous silicon in pesticide adsorption and help the application of mesoporous silicon in pesticide residue treatment.
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Received: 28 September 2020
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2020, Vol. 33 
