一步光催化法净化处理Cd²⁺和RhB废水溶液的研究  

The Research of Purification Wastewater Containing Cd2+ and RhB Dye by a One-Pot Photocatalytic Method

作　　者：肖莹 管文菲 马文 颜廷江 

机构地区：[1]曲阜师范大学化学与化工学院,山东曲阜

出　　处：《物理化学进展》2016年第4期105-111,共7页Journal of Advances in Physical Chemistry

基　　金：国家自然科学基金(21103193);国家大学生创新训练项目(201510446061);曲阜师范大学实验室开放基金(sk201403)的资助。

摘　　要：以Cd2+离子和罗丹明B (RhB)分子共存的废水溶液为研究对象,提出了一步光催化净化思路:即首先向溶液中加入磷酸盐使Cd2+固化形成Cd5H2(PO)4?4H2O沉淀,再利用Cd5H2(PO)4?4H2O在紫外光照射下产生的活性物种原位氧化分解RhB,实现了溶液中Cd2+和RhB同时去除的目的。研究了镉盐种类、磷酸盐种类以及光照三个因素对Cd2+-RhB溶液处理的影响,结果发现,Cd(CH3COO)2、CdSO4和Cd(NO3)2都能被磷酸盐固化形成Cd5H2(PO)4?4H2O沉淀,在紫外光照射下,降解RhB的顺序为:Cd(NO3)2 >CdSO4 >Cd(CH3COO)2;Na3PO4、Na2HPO4和NaH2PO4都能与镉离子反应生成Cd5H2(PO)4?4H2O沉淀,在紫外光照射下,降解RhB的顺序为:Na3PO4 >NaH2PO4 >Na2HPO4;而没有紫外光和催化剂的条件下,RhB分子不会降解。This work proposes a one-pot photocatalytic method to purify wastewater containing Cd2+ and RhB dye. In briefly, by addition of phosphates to immobilize cadmium ions, Cd5H2(PO4)4?4H2O pre-cipitates were initially formed. The Cd5H2(PO4)4?4H2O could be excited by UV to generate active species and then degraded RhB in situ, addressing the simultaneous removal of Cd2+ and RhB solu-tion. The effect of cadmium ion species, phosphate type and light irradiation on the structure of the formed products and the removal performance for Cd2+-RhB solution was investigated. The results showed that all cadmium ions such as Cd(CH3COO)2, CdSO4 and Cd(NO3)2 could be immobilized to form Cd5H2(PO)4?4H2O, which indicated the activity order for RhB as Cd(NO3)2 >CdSO4 >Cd(CH3COO)2. Three phosphates like Na3PO4, Na2HPO4 and NaH2PO4 could immobilize cadmium ions to obtain Cd5H2(PO)4?4H2O that possessed the activity order for RhB as Na3PO4 >NaH2PO4 >Na2HPO4. In the absence of UV light and photocatalyst, RhB could not be degraded.

关 键 词：Cd²⁺ RHB 一步光催化 

分 类 号：X7[环境科学与工程—环境工程]