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环境化学  2015 

磁载光催化剂TiO2/Al2O3/γ-Fe2O3的制备与降解染料的优化模型

Keywords: 磁载光催化,染料,脱色,响应面模型

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Abstract:

采用共沉淀结合固体粒子混合法,在TiO2中引入三氧化二铝包膜磁性核,通过对催化剂的XRD,TEM和红外光谱分析,发现磁性核具有γ-Fe2O3的晶相,且被三氧化二铝及二氧化钛包裹,形成复合型磁载光催化剂.同时对影响磁载光催化剂氧化直接耐酸大红4BS染料废水的因素初始pH值(5.3—5.7)、光强(12.35—18.455μW·cm-2)和TiO2浓度(0.45—1.45mg·l-1)进行研究,通过建立响应曲面模型可得到最佳的初始pH值、光强和磁载光催化剂浓度分别为5.45,19.49×102μW·cm-2和0.86mg·l-1,脱色率达到92.4%.

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