Efficient visible light photo-Fenton-like degradation of organic pollutants using in situ surface-modified BiFeO3 as a catalyst
Efficient visible light photo-Fenton-like degradation of organic pollutants using in situ surface-modified BiFeO3 as a catalyst
复制标题
使用原位表面改性 BiFeO3 作为催化剂有效可见光光芬顿降解有机污染物
DOI：
10.1016/s1001-0742(12)60172-7
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发表时间：
2013-06-01
影响因子：
6.9
通讯作者：
Tang, Heqing
中科院分区：
文献类型：
--
作者：
An, Junjian;Zhu, Lihua;Tang, Heqing
以甲基紫（MV）、罗丹明B （RhB）和苯酚为探针，研究了BiFeO3纳米颗粒在可见光下的类fenton催化性能。在最佳条件下，在bifeo3 - h2o2 -可见光（Vis）体系中，降解MV （30 μ mol/L）、RhB （10 μ mol/L）和苯酚（3 mmol/L）的准一级速率常数k分别为2.21 × 10（-2）、5.56 × 10（-2）和2.01 × 10(-2) min（-1）。引入可见光照射后，MV、RhB和苯酚降解的k值分别是黑暗条件下的3.47倍、1.95倍和2.07倍。一般来说，BiFeO3-H2O2- vis体系中的k值随着BiFeO3负荷和H2O2浓度的增加而加速，但随着初始污染物浓度的增加而降低。为了进一步提高对高浓度污染物的降解能力，我们对BiFeO3进行了表面改性。添加0.4 mmol/L的乙二胺三乙酸（EDTA, 0.4 mmol/L）使MV降解k值（60 μ mol/L）从BiFeO3-H2O2-Vis体系的1.01 × 10(-2) min（-1）提高到EDTA-BiFeO3-H2O2-Vis体系的1.30 min(-1)，提高了128倍。这表明原位表面改性可以使BiFeO3纳米颗粒成为一种有前途的可见光- fenton类催化剂，用于降解有机污染物。
The visible light photo-Fenton-like catalytic performance of BiFeO3 nanoparticles was investigated using Methyl Violet (MV), Rhodamine B (RhB) and phenol as probes. Under optimum conditions, the pseudo first-order rate constant (k) was determined to be 2.21 x 10(-2), 5.56 x 10(-2) and 2.01 x 10(-2) min(-1) for the degradation of MV (30 mu mol/L), RhB (10 mu mol/L) and phenol (3 mmol/L), respectively, in the BiFeO3-H2O2-visible light (Vis) system. The introduction of visible light irradiation increased the k values of MV, RhB and phenol degradation 3.47, 1.95 and 2.07 times in comparison with those in dark. Generally, the k values in the BiFeO3-H2O2-Vis system were accelerated by increasing BiFeO3 load and H2O2 concentration, but decreased with increasing initial pollutant concentration. To further enhance the degradation of pollutants at high concentrations, BiFeO3 was modified with the addition of surface modifiers. The addition of ethylenediamineteraacetic acid (EDTA, 0.4 mmol/L) increased the k value of MV degradation (60 mu mol/L) from 1.01 x 10(-2) min(-1) in the BiFeO3-H2O2-Vis system to 1.30 min(-1) in the EDTA-BiFeO3-H2O2-Vis system by a factor of 128. This suggests that in situ surface modification can enable BiFeO3 nano-particles to be a promising visible light photo-Fenton-like catalyst for the degradation of organic pollutants.