摘要：

通过浸渍-热分解法制备Fe₃O₄/TiO_x磁性颗粒，以表面形貌、元素含量、晶体结构及红外光谱等确定TiO_x层在Fe₃O₄颗粒表面负载成功。以Fe₃O₄/TiO_x磁性颗粒为外部颗粒，PbO₂电极为主电极，构建2.5维电极体系。通过对比氧化降解效果、·OH浓度、金属元素释放量和废水生物毒性等指标，发现2.5维体系优于2维体系，并确定最佳颗粒投加量为0.4 g。该体系受电流密度和初始浓度的影响趋势与2维体系一致。

关键词: 二氧化铅, 2.5维电极体系, TiO_x磁性颗粒, 电催化

Abstract:

Fe₃O₄/TiO_x magnetic particles were prepared by impregnation-thermal-decomposition method in this paper. The surface morphology, element content, crystal structure and infrared spectrum were used to determine the success of loading TiO_x layer on the surface of Fe₃O₄ particles. Fe₃O₄/TiO_x magnetic particles were adopted as external auxiliary particles and PbO₂ electrode was employed as the main electrode to construct a 2.5-dimensional electrode system. After that, by comparing the degradation effect, the yield of hydroxyl radicals, the release of metal elements and the biological toxicity of wastewater before and after electrolysis, it was found that the 2.5-dimensional electrode system was superior to the 2-dimensional electrode system in electro-catalytic oxidation performance, and the optimal Fe₃O₄/TiO_x magnetic particle dosage was determined to be 0.4 g. The influence trend of current density and initial concentration of the system was consistent with that of traditional 2-dimensional electrode system.

Key words: lead dioxide, 2.5-dimensional electrode system, TiO_x magnetic particles, electrochemical oxidation

中图分类号: 

• X703.1