Journal of Water Chemistry and Technology ( IF 0.6 ) Pub Date : 2021-08-02 , DOI: 10.3103/s1063455x21030085 A. I. Ivanets 1
Abstract
The development of novel materials and technologies for wastewater treatment from organic pollutants is an urgent task. Nanostructured metal ferrites are characterized by high chemical stability, ease of production, and good magnetic properties, and are promising catalytic materials for advanced oxidation processes. In this study, heterogeneous Fenton catalysts based on magnesium ferrite doped with lanthanide ions are synthesized and studied. It is established that the obtained samples are single-phase products with a spinel ferrite structure. It is shown that crystal lattice parameter a ranges from 8.387 to 8.431 Å, depending on the nature of the dopant ion, and increases with an increase in the cation radius. The unit cell volume has similar values for the synthesized samples and ranges from about 0.590 to 0.599 nm3. The doping of magnesium ferrite causes a decrease in the average crystallites size, which ranges from about 12.4 to 19.4 nm for the obtained samples. The catalytic activity of magnesium ferrites in the Fenton and photo-Fenton processes of oxidative degradation of methylene blue is studied. It is shown that the efficiency of oxidative degradation of the dye reaches, regardless of the nature of the dopant ion, 95–100% when the process is carried out under UV and visible radiation in 20 and 60 min, respectively. The initial magnesium ferrite is characterized by the highest catalytic activity when using the visible range of radiation, and magnesium ferrite samples doped with La3+, Ce3+, and Dy3+ ions exhibit the highest catalytic activity under UV radiation. The obtained results are of interest for the direct control of the crystal structure and catalytic properties of heterogeneous Fenton catalysts based on magnesium ferrite doped with lanthanides.
中文翻译:
镧系元素掺杂镁铁氧体催化降解亚甲基蓝
摘要
开发用于有机污染物废水处理的新材料和新技术是一项紧迫的任务。纳米结构金属铁氧体具有化学稳定性高、易于生产和良好的磁性等特点,是用于高级氧化过程的有前途的催化材料。在这项研究中,合成并研究了基于掺杂镧系元素的铁酸镁的多相芬顿催化剂。确定获得的样品是具有尖晶石铁素体结构的单相产品。表明晶格参数a范围从 8.387 到 8.431 Å,取决于掺杂离子的性质,并且随着阳离子半径的增加而增加。合成样品的晶胞体积具有相似的值,范围从大约 0.590 到 0.599 nm 3. 镁铁氧体的掺杂导致平均微晶尺寸减小,对于所获得的样品,其范围为约 12.4 至 19.4 nm。研究了铁酸镁在 Fenton 和 photo-Fenton 氧化降解亚甲基蓝过程中的催化活性。结果表明,无论掺杂离子的性质如何,当该过程分别在紫外线和可见光辐射下进行 20 分钟和 60 分钟时,染料的氧化降解效率均达到 95-100%。初始铁氧体镁的特点是在可见光辐射范围内具有最高的催化活性,掺杂有 La 3+、Ce 3+和 Dy 3+ 的镁铁氧体样品离子在紫外线辐射下表现出最高的催化活性。所获得的结果对于直接控制基于掺杂镧系元素的铁酸镁的多相芬顿催化剂的晶体结构和催化性能具有重要意义。