【摘要】 在季铵化壳聚糖（QCS）铸膜液中,借助水解反应将Fe-TiO₂和Fe₂O₃量子点负载于多孔SiO₂孔结构中,制备Fe-TiO₂-SiO₂/QCS复合膜催化剂。通过X射线衍射、透射电镜和红外光谱对其进行表征。结果表明:当Ti/Fe（摩尔比）≥10时,形成Fe-TiO₂量子点;当Ti/Fe（摩尔比）≤3时,形成Fe₂O₃量子点。以甲基橙为模型污染物,在λ=365nm的辐射源辐照下,研究Fe-TiO₂-SiO₂/QCS膜催化剂催化降解甲基橙染料的性能。结果表明:当甲基橙初始浓度C0=10mg/L,pH=2时,Ti/Fe=3的复合膜催化剂对甲基橙溶液的降解率达到最大值（90%）,明显高于只含TiO₂复合膜催化剂相同条件下光催化降解甲基橙的降解率（60%）。更多还原

【Abstract】 Fe-TiO₂ and Fe₂O₃ quantum dots were supported in the SiO₂ structure by hydrolysis reaction,and then the quaternized chitosan was used as the film matrix.The above materials were introduced into the quaternized chitosan（QCS）casting solution to prepare Fe-TiO₂-SiO₂/QCS composite membrane catalyst.The catalyst was characterized by XRD,TEM and FT-IR.The results shown that when Ti/Fe（molar ratio）≥10,Fe-TiO₂ quantum dots were formed.When Ti/Fe（molar ratio）≤3,additional Fe₂O₃ quantum dots were formed.The photocatalytic degradation of methyl orange was studied by Fe-TiO₂-SiO₂/QCS film under ultraviolet lightλ=365 nm with methyl orange as a pollutant model.The initial concentration of methyl orange solution and the effect of pH value on the catalytic efficiency of the membrane were investigated.When the initial concentration of methyl orange C₀=10 mg/L,pH=2,the degradation rate of the Ti/Fe=3 membrane to methyl orange solution reached a maximum of 90%.It was significantly higher than the 60% degradation rate of photocatalytic degradation of methyl orange under the same conditions of TiO₂ composite membrane catalyst alone.更多还原