In this work, MgFeCrO₄ magnetic nanoparticles were prepared in spinel structure via the green sol-gel method. The high photocatalytic activity of MgFeCrO₄ MNPs was studied for the fast degradation of organic dye in water solution at room condition and natural pH. Tragacanth gel was used for providing comfortable, nature, and an inexpensive sol-gel method. The MgFeCrO₄ MNPs were fully characterized by FTIR, XRD, BET, FESEM, EDX, VSM, TEM, DRS, and percent of dyes degradation was followed by UV–vis spectroscopy. The XRD pattern confirmed the formation of spinel cubic MgFeCrO₄ magnetic nanoparticles. Direct black 122 (DB122) was chosen as an example of pollution to investigate the photodegradation via as-prepared magnetic nanoparticle. The results indicated that 96 % of DB122 dye were degraded in only 60 s. The kinetics of degradation of DB122 is consistent with the pseudo-first-order kinetics model. MgFeCrO₄ magnetic nanoparticles show excellent reusability for degradation DB122 dye because the photocatalyst did not exhibit a significant decrease in its activity even after four runs.

本文通过绿色溶胶-凝胶法制备了尖晶石结构的MgFeCrO ₄磁性纳米粒子。研究了MgFeCrO ₄ MNPs的高光催化活性，可在室温和自然pH下快速降解水溶液中的有机染料。黄ga胶被用于提供舒适，自然和廉价的溶胶-凝胶法。通过FTIR，XRD，BET，FESEM，EDX，VSM，TEM，DRS对MgFeCrO ₄ MNP进行了全面表征，然后通过紫外可见光谱法对染料的降解百分比进行了表征。X射线衍射图证实了尖晶石立方MgFeCrO ₄的形成磁性纳米粒子。选择直接黑122（DB122）作为污染的例子，以研究通过制备的磁性纳米粒子的光降解。结果表明，仅60 s即可降解96％的DB122染料。DB122的降解动力学与拟一级动力学模型一致。MgFeCrO ₄磁性纳米颗粒显示出优异的降解DB122染料的可重复使用性，因为即使经过四次运行，光催化剂的活性也不会显着降低。