Wu Pengfei, Qin Yufei, Gao Mengyuan, Zheng Rui, Zhang Yixin, Li Xinli, Liu Zhaolong, Zhang Yingkun, Cao Zhen, Liu Qingling
Tianjin Key Laboratory of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
Hebei Pollution Control Technology Innovation Center of Steel and Coking Industry, Department of Environmental and Chemical Engineering, Hebei Vocational University of Industry and Technology, Shijiazhuang 050091, China.
Molecules. 2024 Feb 19;29(4):919. doi: 10.3390/molecules29040919.
In this work, to promote the separation of photogenerated carriers, prevent the catalyst from photo-corrosion, and improve the photo-Fenton synergistic degradation of organic pollutants, the coating structure of FeOOH/BiO rich in oxygen vacancies was successfully synthesized by a facile and environmentally friendly two-step process of hydrothermal and chemical deposition. Through a series of degradation activity tests of synthesized materials under different conditions, it was found that FeOOH/BiO demonstrated outstanding organic pollutant degradation activity under visible and near-infrared light when hydrogen peroxide was added. After 90 min of reaction under photo-Fenton conditions, the degradation rate of Methylene Blue by FeOOH/BiO was 87.4%, significantly higher than the degradation efficiency under photocatalysis (60.3%) and Fenton (49.0%) conditions. The apparent rate constants of FeOOH/BiO under photo-Fenton conditions were 2.33 times and 3.32 times higher than photocatalysis and Fenton catalysis, respectively. The amorphous FeOOH was tightly coated on the layered BiO, which significantly increased the specific surface area and the number of active sites of the composites, and facilitated the improvement of the separation efficiency of the photogenerated carriers and the prevention of photo-corrosion of BiO. The analysis of the mechanism of photo-Fenton synergistic degradation clarified that ·OH, h, and ·O are the main active substances involved in the degradation of pollutants. The optimal degradation conditions were the addition of the FeOOH/BiO composite catalyst loaded with 20% Fe at a concentration of 0.5 g/L, the addition of hydrogen peroxide at a concentration of 8 mM, and an initial pH of 4. This outstanding catalytic system offers a fresh approach to the creation and processing of iron-based photo-Fenton catalysts by quickly and efficiently degrading various organic contaminants.
在本工作中，为促进光生载流子的分离，防止催化剂发生光腐蚀，并提高光芬顿协同降解有机污染物的性能，通过水热和化学沉积两步简便且环境友好的工艺，成功合成了富含氧空位的FeOOH/BiO涂层结构。通过对合成材料在不同条件下进行一系列降解活性测试，发现添加过氧化氢时，FeOOH/BiO在可见光和近红外光下表现出优异的有机污染物降解活性。在光芬顿条件下反应90分钟后，FeOOH/BiO对亚甲基蓝的降解率为87.4%，显著高于光催化（60.3%）和芬顿（49.0%）条件下的降解效率。FeOOH/BiO在光芬顿条件下的表观速率常数分别比光催化和芬顿催化高2.33倍和3.32倍。非晶态FeOOH紧密包覆在层状BiO上，显著增加了复合材料的比表面积和活性位点数量，有利于提高光生载流子的分离效率并防止BiO发生光腐蚀。光芬顿协同降解机理分析表明，·OH、h和·O是参与污染物降解的主要活性物质。最佳降解条件为添加浓度为0.5 g/L、负载20% Fe的FeOOH/BiO复合催化剂，添加浓度为8 mM的过氧化氢，初始pH值为4。这种优异的催化体系通过快速高效地降解各种有机污染物，为铁基光芬顿催化剂的制备和处理提供了一种新方法。
