In order to solve the problem of water pollution caused by dye, in this paper, TiO2 supported MO molecularly imprinted polysiloxane (MIP) was prepared using TiO2 as carrier, methyl orange (MO) as template molecule and silane as functional monomer. The MIP was mixed and dispersed in sodium alginate (NaAlg) aqueous solution to obtain the casting solution. The solution was cross-linked by calcium ion to MO molecularly imprinted polysiloxane-calcium alginate (MIP-CaAlg) composite hydrogel membrane. At the same time, non-imprinted polysiloxane-calcium alginate (NIP-CaAlg) composite hydrogel membrane was prepared without template. The composite hydrogel membranes were characterized by transmission electron microscopy, scanning electron microscopy, infrared spectroscopy, and thermogravimetric analysis, MO adsorption and photocatalytic degradation of the composite hydrogel membranes were studied. The results showed that compared with NIP-CaAlg composite membrane, MIP-CaAlg membrane had stronger adsorption performance and photocatalytic degradation of MO. When the addition of MIP was 30% of NaAlg, the photocatalytic degradation rate of 0.1 mmol/L MO by MIP-CaAlg composite membrane was 91.7% and the reaction rate constant was 0.012 min-1 at 3 h of reaction. The preparation process of the composite hydrogel membrane was simple, low cost, green and environmental protection, which provided a new idea for solving efficient degradation of dying wastewater.
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