Guizhu Wu,Yan Zhang,Jingyu Sun,Xue Chen,Ze Zhang,GuiChang Wang,Mingyang Liu
In recent years, various strategies focused on regulating the different defect types and concentrations have been put forward to alter the photo- or electro-catalytic performance of nanomaterials (NMs), such as chemical vapor deposition, thermal annealing, heavy ion irradiation, etc . Herein, a simple strategy for regulating the concentration of oxygen vacancies was developed by in-situ Bi reduction of BiOBr nanoflowers (Bi-BiOBr), largely influencing its photocatalytic activities under the visible light irradiation. The first-principle computation and experimental results revealed that the enhanced doped Bi caused high concentration of oxygen vacancy, thus effectively improving the transfer and separation of photogenerated e - /h + pairs. High concentration of reactive species such as superoxide radical and singlet oxygen was obtained, which led to an efficient antibacterial activity. Meanwhile, Bi-BiOBr exhibited strong binding ability to bacterial cells due to its abundant oxygen vacancy, showing excellent photodynamic performance under visible light irradiation.
Min Wang,Beiyang Guo,Jiayu Zhan,Yuan Zhuang,Sridhar Komarneni,Jianfeng Ma
Mo-doped BiOBr nanoflowers were prepared by hydrothermal method with various Bi:Mo molar ratios, and their degradation efficiency of tetracycline under visible light was investigated using K 2 S 2 O 8 activation. Among the above series of catalysts, the sample containing 2% Mo dopant exhibited the optimum photocatalytic activity, which could efficiently remove tetracycline (TC) within 40 min. The mechanism of photocatalytic activity can be well explained by the generation of superoxide radicals (O 2 − ), sulfate radicals (SO 4 − ), hydroxyl radicals ( OH) and holes (h + ), which are responsible for the degradation of TC. In addition, the 2 %Mo-BiOBr catalyst has good recycling stability.
Hydrogen peroxide (H 2 O 2 ) is a major transmitter of redox signals during chemical processes. Cost-effective and easy-to-operate sensors for H 2 O 2 are in high demand in a variety of fields. A novel photoelectrochemical (PEC) sensor for H 2 O 2 detection was investigated, using BiOBr/TiO 2 NAs/FTO (BiOBr/TNAs) as a PEC electrode which is obtained by successive ionic layer adsorption and reaction (SILAR) method. This non-enzymatic PEC BiOBr/TNAs electrode shows excellent selectivity, stability, and reproducibility for H 2 O 2 detection in optimizing modes. The linear relationship is in a broad range from 4 to 1800 μM (R 2 = 0.994) and a detection limit of 0.65 μM (S/N = 3). In the detection of H 2 O 2 in apple juice and milk real samples, the BiOBr/TNAs show outstanding recovery ranging from 98.0 % to 102.0 %, indicating great potential in practical applications. Meanwhile, the p-n heterojunction formed between BiOBr and TiO 2 improves the utilization of visible light and effectively promotes the separation of photogenerated electrons and holes. This work provides a new strategy for the non-enzymatic detection of hydrogen peroxide in PEC mode.
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