光响应性介孔二氧化硅的制备与表征

Preparation and characterization of photo-responsive mesoporous silica

采用软模板法,以正硅酸乙酯(TEOS)为硅源、十六烷基三甲基对甲苯磺酸铵(CTATos)为模板剂,分别以三乙醇胺(TEOA)和氨水为碱源,调节乙醇和水的比例,制备介孔二氧化硅,结果表明:制备纳米尺寸介孔二氧化硅的最佳反应条件为TEOS 1.56 mL、CTATos 1.92 g、TEOA 1.9 mL、乙醇10.5 mL、水74.5 mL;制备亚微级尺寸介孔二氧化硅的最佳反应条件为TEOS 1.56 mL、CTATos 1.92 g、氨水1.9 mL、乙醇42 mL、水43.5 mL。采用嫁接法,以偶氮苯衍生物为改性材料对介孔二氧化硅进行光响应功能化;运用扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)、紫外-可见光分光光度计(UV-vis)和热重分析仪(TGA)进行表征,结果制备的介孔二氧化硅粒径可控,大小均一,分散性良好,改性后的介孔二氧化硅具有光响应性能。

A soft template method was used to prepare mesoporous silica with ethyl orthosilicate(TEOS) as the silicon source and cetyltrimethyl ammonium p-toluenesulfonate(CTATos) as the template agent. Triethanolamine(TEOA) and ammonia were selected as the alkali source separately and adjusting the ratio of ethanol and water. The results show that the optimal reaction conditions for the prepared nano-sized mesoporous silica include TEOS 1.56 mL, CTATos 1.92 g, TEOA 1.9 mL, ethanol 10.5 mL and water 74.5 mL;the optimal reaction conditions for the prepared submicron-sized mesoporous silica include TEOS 1.56 mL, CTATos 1.92 g, ammonia 1.9 mL, ethanol 42 mL and water 43.5 mL. The grafting method was used to functionally modify mesoporous silica by using azobenzene derivatives as modification materials. The test results were characterized by scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FTIR), ultraviolet-visible spectrophotometer(UV-vis) and thermogravimetric analyzer(TGA). The results show that the particle size of the prepared mesoporous silica is controllable and uniform with good dispersibility;and the modified mesoporous silica has photo-responsive properties.