TiO2 载体甲基橙印迹聚硅氧烷-海藻酸钙膜及性能研究

张新新; 王文爽; 李琦; 冯灵智; 赵孔银

doi:10.16026/j.cnki.iea.2024010053

离子交换与吸附 ›› 2025, Vol. 41 ›› Issue (03) : 190 -199. DOI: 10.16026/j.cnki.iea.2024010053

研究论文

TiO₂ 载体甲基橙印迹聚硅氧烷-海藻酸钙膜及性能研究

张新新 ¹^,² ,
王文爽 ² ,
李琦 ² ,
冯灵智 ² ,
赵孔银 ²

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Preparation and Properties of TiO₂ Carrier Methyl Orange Imprinted Polysiloxane-calcium Alginate Membrane

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摘要

为解决染料废水的污染问题，文章以TiO₂为载体，甲基橙 (MO) 为模板分子，硅烷为功能单体，制备了MO分子印迹聚硅氧烷 (MIP)，将其混合分散在海藻酸钠 (NaAlg) 水溶液中得到铸膜液，经过钙离子交联，得到MO分子印迹聚硅氧烷-海藻酸钙 (MIP-CaAlg) 复合水凝胶膜，同时不加模板分子制备了非印迹聚硅氧烷-海藻酸钙 (NIP-CaAlg) 复合水凝胶膜，采用透射电镜、扫描电镜、红外光谱和热重分析对其进行表征，研究其对MO的吸附和光催化降解性能。结果表明，与NIP-CaAlg膜相比，MIP-CaAlg膜对MO的吸附和光催化降解性更强。当MIP的添加量为NaAlg质量的30%，反应3 h时MIP-CaAlg复合膜对0.1 mmol/L MO的光催化降解率为91.7%，反应速率常数为0.012 min^-1。该复合水凝胶膜制备工艺简单，成本低，绿色环保，为印染废水的高效降解提供了新思路。

Abstract

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.