Abstract

Nickel-zinc ferrites, which have pronounced ferrimagnetic and semiconductor properties, can be used as promising magnetically controlled photocatalysts for the purification of aqueous media from organic pollutants. The value of the specific surface area largely affects the photocatalytic properties of the material; therefore, the possibility of its control and variation at the stage of synthesis is of great scientific and technical interest. In this study, nanocrystalline ferrite of the Zn_0.5Ni_0.5Fe₂O₄ composition is obtained under conditions of solution combustion using various types of organic fuel as the main factor affecting the formation of the specific surface area, and subsequent heat treatment in air at a temperature of 500°C for 2 h. The crystal structure, chemical composition, and morphology of Zn_0.5Ni_0.5Fe₂O₄ are studied by methods of X‑ray phase analysis, X-ray spectral microanalysis, and scanning electron microscopy. The values of the specific surface area of the synthesized nanopowders are calculated based on the method of liquid-phase adsorption from a Methylene Blue solution and the low-temperature adsorption-desorption of nitrogen. The results of the X‑ray phase analysis show that a single-phase nanocrystalline product with a spinel structure is formed, where the average crystallite size varies within 11–23 nm and is inversely related to the value of the specific surface area, respectively, after the reaction with succinic acid (39.1 m²/g) and with glycine (20.2 m²/g). It is established that the choice of the fuel largely affects the formation of nanocrystals and the specific surface area of the samples, and the approach used makes it possible to control its values.

中文翻译：

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溶液燃烧条件下 Zn0.5Ni0.5Fe2O4 纳米晶体的形成：燃料类型对结构和形貌的影响

摘要

镍锌铁氧体具有明显的亚铁磁性和半导体特性，可用作有前途的磁控光催化剂，用于净化水介质中的有机污染物。比表面积的大小很大程度上影响材料的光催化性能；因此，在合成阶段对其进行控制和变异的可能性具有重大的科学和技术意义。在本研究中，Zn _0.5 Ni _0.5 Fe ₂ O _{4纳米晶铁氧体}组合物是在以各种有机燃料为影响比表面积形成的主要因素的溶液燃烧条件下获得的，随后在空气中在500℃的温度下热处理2小时。_{Zn 0.5} Ni _0.5 Fe ₂ O ₄的晶体结构、化学成分和形貌通过 X 射线物相分析、X 射线光谱微分析和扫描电子显微镜方法进行研究。基于亚甲蓝溶液液相吸附和氮气低温吸附-脱附的方法计算了合成纳米粉末的比表面积值。X射线物相分析结果表明，形成了具有尖晶石结构的单相纳米晶产物，其平均晶粒尺寸在11-23 nm之间变化，并且与比表面积值成反比，与琥珀酸 (39.1 m ² /g) 和甘氨酸 (20.2 m ^{2 /g ) 反应后}/G）。已确定燃料的选择很大程度上影响纳米晶体的形成和样品的比表面积，并且所使用的方法使得控制其值成为可能。