Tatarchuk Tetiana, Shyichuk Alexander, Danyliuk Nazarii, Naushad Mu, Kotsyubynsky Volodymyr, Boychuk Volodymyra
Faculty of Chemistry, Jagiellonian University, 30-387, Kraków, Poland; Educational and Scientific Center of Material Science and Nanotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, 76018, Ukraine.
Educational and Scientific Center of Material Science and Nanotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, 76018, Ukraine; Faculty of Chemical Technology and Engineering, Bydgoszcz University of Science and Technology, 85-326, Bydgoszcz, Poland.
Chemosphere. 2023 Jun;326:138364. doi: 10.1016/j.chemosphere.2023.138364. Epub 2023 Mar 16.
The cobalt ferrite Fenton catalysts were obtained by the flow co-precipitation method. FTIR, XRD, and Mössbauer spectroscopy confirmed the spinel structure. The crystallite size of the as-synthesized sample is 12 nm, while the samples annealed at 400 and 600 °C have crystallite sizes of 16 and 18 nm, respectively. The as-synthesized sample has a grain size of 0.1-5.0 μm in size, while the annealed samples have grain sizes of 0.5 μm-15 μm. The degree of structure inversion ranges from 0.87 to 0.97. The catalytic activity of cobalt ferrites has been tested in the decomposition of hydrogen peroxide and the oxidation of caffeine. The annealing of the CoFeO increases its catalytic activity in both model reactions, with the optimal annealing temperature being 400 °C. The reaction order has been found to increase with increasing HO concentration. Electromagnetic heating accelerates the catalytic reaction more than 2 times. As a result, the degree of caffeine decomposition increases from 40% to 85%. The used catalysts have insignificant changes in crystallite size and distribution of cations. Thus, the electromagnetically heated cobalt ferrite can be a controlled catalyst in water purification technology.
通过流动共沉淀法制备了钴铁氧体芬顿催化剂。傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和穆斯堡尔谱证实了其尖晶石结构。合成样品的微晶尺寸为12纳米，而在400℃和600℃退火的样品微晶尺寸分别为16纳米和18纳米。合成样品的晶粒尺寸为0.1 - 5.0微米，而退火样品的晶粒尺寸为0.5微米 - 15微米。结构反转程度在0.87至0.97之间。已对钴铁氧体在过氧化氢分解和咖啡因氧化反应中的催化活性进行了测试。CoFeO的退火提高了其在这两个模型反应中的催化活性，最佳退火温度为400℃。发现反应级数随HO浓度的增加而增加。电磁加热使催化反应加速超过2倍。结果，咖啡因分解程度从40%提高到85%。使用过的催化剂在微晶尺寸和阳离子分布方面变化不显著。因此，电磁加热的钴铁氧体可以成为水净化技术中一种可控的催化剂。
