【摘要】 将不同类型树脂(大孔强碱性阴离子交换树脂D201、螯合树脂D401、大孔强酸性苯乙烯阳离子交换树脂D001)负载铁(Ⅲ)作为光催化剂,在可见光(≥420nm)照射下,通过外加H2O2光催化降解罗丹明B(Rhodamine B,RhB).结果表明,在可见光和pH=6.2条件下,螯合树脂D401负载铁(Ⅲ)光催化剂具有最好的光催化活性.该催化剂对RhB降解的最佳条件为:催化剂用量400mg/L,H2O2浓度7.49×10-4 mol/L.并且,该催化剂在可见光条件下对无色小分子二氯苯酚(2,4-Dichlorophenol,DCP)也具有良好的光催化降解活性,表明其具有可见光催化活性.同时,跟踪测定了螯合树脂D401负载铁(Ⅲ)光催化剂在RhB降解过程中羟基自由基(·OH)的变化,结果表明光催化机理涉及·OH氧化历程.更多还原

【Abstract】 In this study,heterogeneous Fenton-like photocatalysts D201-Fe(Ⅲ),D401-Fe(Ⅲ)and D001-Fe(Ⅲ)were prepared by loading iron(Ⅲ)on anion exchange resin(D201),chelating resin(D401)and acidic cation-exchange(D001),respectively.These photocatalysts were used to degrade Rhodamine B(RhB)and 2,4-Dichlorophenol(DCP)under visible light irradiation(420nm)to explore their photocatalytic ability in the presence of hydrogen peroxide(H2O2).The results showed that D401-Fe(Ⅲ)had the best photocatalytic activity under visible light at pH of 6.2.The optimal degradation conditions of RhB were got with the 400mg/L catalyst dose and 7.49×10-4 mol/L H2O2 concentration.Moreover,DCP was also efficiently degraded under visible light which indicated that D401-Fe(Ⅲ)could be excited by visible light.Hydroxyl radical(·OH)generated during the degradation process was determined which demonstrated that the photocatalytic mechanism was mainly involved·OH.更多还原