Visible photocatalytic degradation of rhodamine B by a photo fenton-like system consisting of PW11O39Fe(Ⅲ)(H2O)4-/H2O2

CHEN Yan; LI Dulei; YANG Jinman; GAO Wenkai; HUA Yingjie; WANG Chongtai

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Visible photocatalytic degradation of rhodamine B by a photo fenton-like system consisting of PW₁₁O₃₉Fe(Ⅲ)(H₂O)^4-/H₂O₂

更新时间：2023-12-11

- Visible photocatalytic degradation of rhodamine B by a photo fenton-like system consisting of PW₁₁O₃₉Fe(Ⅲ)(H₂O)^4-/H₂O₂
- Acta Scientiarum Naturalium Universitatis SunYatseni Vol. 55, Issue 4, Pages: 81-86(2016)
- 作者机构：
  
  海南师范大学化工学院,海南,海口,571158
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2016，
  
  Published Online：25 July 2016，
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CHEN Yan, LI Dulei, YANG Jinman, et al. Visible photocatalytic degradation of rhodamine B by a photo fenton-like system consisting of PW₁₁O₃₉Fe(Ⅲ)(H₂O)^4-/H₂O₂. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 55(4):81-86(2016)
DOI：

CHEN Yan, LI Dulei, YANG Jinman, et al. Visible photocatalytic degradation of rhodamine B by a photo fenton-like system consisting of PW₁₁O₃₉Fe(Ⅲ)(H₂O)^4-/H₂O₂. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 55(4):81-86(2016) DOI：

摘要

以Keggin型铁取代杂多阴离子PW

Fe(Ⅲ)(H

(PW

Fe)为可见光活性组分构建了一个类光-芬顿体系(PW

Fe/H

)，并用于模型污染物罗丹明B(RhB)的可见光催化降解，同时考察了H

浓度、PW

Fe浓度、RhB初始浓度及溶液pH值对RhB可见光催化降解速率的影响，讨论了RhB光催化降解的动力学性质。实验结果表明，当溶液pH=4.5时，由0.6 mmol·L

-1

Fe和 4 mmol·L

-1

构成的体系对RhB的光催化降解效果最佳，0.01 mmol·L

-1

的 RhB在250 W金卤灯照射下反应60 min

其降解率达到100%，反应240 min，总有机碳(TOC)去除率约48%。羟基自由基猝灭和电子顺磁共振(EPR)实验表明，PW

Fe/H

体系在可见光照射下产生羟基自由基，从而导致RhB的快速降解，降解反应的表观速率常数k为(6.2±2)×10

-2

mmol·L

-1

·min

-1

。

Abstract

A photo-Fenton-Like system (PW

Fe/H

) using Keggin-type Fe(Ⅲ)-substituted〓heteropolyanion PW

Fe(Ⅲ)(H

(PW

Fe) as the visible light activity component was studied

which was employed for the photocatalytic degradation of model pollutant rhodamine B (RhB) under an artificial VIS irradiation. Influences of the H

concentration

the PW

Fe concentration

the initial RhB concentration and the solution pH on the photocatalytic degradation rate of RhB was also examined

together with a discussion on the kinetics of RhB degradation. The results showed that the degradation ratio of 100% was obtained at 60 min for 0.01 mmol·L

-1

RhB with the optimum conditions of pH 4.5

0.6 mmol·L

-1

Fe and 4 mmol·L

-1

under the irradiation of 250 W metal halide lamp. The total organic carbon (TOC) removal was about 48% at 240 min. The hydroxyl radical quenching and electron paramagnetic resonance (EPR) experiments revealed that hydroxyl radicals generated by PW

Fe/H

system under visible light irradiation were the main reactive oxygen species

resulting in the rapid degradation of RhB. The apparent rate constant of RhB degradation was estimated to be (6.2±2) 10

-2

mmol·L

-1

· min

-1

.

关键词

Keggin型铁取代杂多阴离子过氧化氢罗丹明B均相光催化电子顺磁共振

Keywords

iron-substituted heteropolyanionhydrogen peroxiderhodamine Bhomogeneous photocatalysiselectron paramagnetic resonance

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