Huixin et al. found a mesoporous magnet made of NiFe2O4 and ZnCuCr-LDH that was easily hydrothermally created from saccharin wastewater and its potential for use in wastewater treatment by practical adsorption. During the procedure, iron was completely recirculated and about 83% COD of the saccharin effluent was eliminated. It may be inferred that electrostatic attraction and anion exchange accounted for most of the adsorption mechanism. The porous magnet composite as-prepared exhibits excellent adsorption capability and a straightforward synthesis and separation method, indicating good potential to recirculate the waste metal for use in realistic wastewater treatment applications. Scientists addressed two challenges in wastewater treatment with photocatalysis: reducing the catalyst's energy requirement and simplifying its removal after treatment. Their solution involved designing magnetic NCs that can be easily separated. These catalysts were made by combining magnetic NPs (Co0.5Zn0.25M0.25Fe2O4, where M varied by Mg, Mn, Cu and Ni) with a specific sugar molecule (carboxymethyl cellulose) and then coprecipitating them with a base. Next, the magnetic NPs were integrated with titanium dioxide using a template and a titanium source. A key feature of these NCs is that the magnetic NPs allow the titanium dioxide to be activated by visible light, enabling them to function under sunlight. Jianping et al. explored a novel class of high-entropy (HE) spinel ferrites for wastewater treatment applications.