PW_(11)O_(39)Co(Ⅱ)(H_2O)^(5-)的均相及异相体系可见光催化性能研究  

A Study on the Visible Photocatalytic Property of PW_(11)O_(39)Co(Ⅱ)(H_2O)^(5-) in Homogeneous and Heterogeneous Systems

作　　者：华英杰[1] 徐孝南 邹晓梅[1] 韩雷云 吴萌[1] 王崇太[1] 

机构地区：[1]海南师范大学化学与化工学院,海口571158

出　　处：《无机化学学报》2014年第8期1895-1903,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21161007);海南省国际科技合作项目(No.2012-GH004;KJHZ2014-08);海南省应用技术研究与开发专项(No.ZDXM20130088;ZDXM2014099);海南省大学生创新训练项目(No.2013116580)资助项目

摘　　要：以模型污染物罗丹明B(RhB)的光降解为探针,评估了Keggin型钴取代杂多阴离子PW11O39Co髤(H2O)5-(PW11Co)及其异相体系PW11Co/D301R的可见光催化活性,提出了光催化反应的机理,同时考察了催化剂用量、溶液酸度以及溶液中PW11Co和RhB的相互作用对RhB可见光催化降解速率的影响。实验结果表明,PW11Co均相体系及其异相体系PW11Co/D301R对RhB的可见光降解均有较高的光催化活性,但PW11Co/D301R的光催化活性更高。导致RhB降解的主要是羟基自由基。与PW11Co均相体系相比,在PW11Co/D301R异相体系中由于PW11Co与RhB的配位作用大为减弱,同时D301R对RhB具有富集作用,因而大大提高了RhB的光催化降解速率。The visible photocatalytic activity （H2O）5-（PW11Co） and its heterogeneous system dye pollutant rhodamine B （RbB） as a probe. of the Keggin-type cobalt-substituted heteropolyanion PWuO39Co（Ⅱ） PWnCo/D301R was evaluated through the photodegradation of the A photocatalysis mechanism was suggested and the influences of the catalyst amount, the solution acidity as well as the interaction between PWnCo and RhB were also examined. The experimental results showed that both of the homogeneous system PWnCo and the heterogeneous system PWHCo/ D301R have a high photocatalytic activity for the visible photodegradation of RhB, but the photocatalytic activity of PWuCo/D301R is higher than that of PWnCo, for example, with other identical conditions it took 90 rain for a complete degradation of RhB with a concentration of 10 μmmol· L^-1 for the former, but 50 min for the latter. The mineralization percentage of RhB at 120 min during degradation is 34% for the former, but 48% for the latter. The hydroxyl radicals are considered to be responsible for the RhB degradation. Compared to the homogeneous system, the photocatalytic degradation rate of RhB is obviously enhanced in the heterogeneous system due to the weakened complexation of PWHCo with RhB and the enrichment of D301R towards RhB.

关 键 词：Keggin型钴取代杂多阴离子 可见光催化剂 罗丹明B降解 D301R阴离子交换树脂 

分 类 号：O643.3[理学—物理化学]