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Based on the adsorption characteristics of activated carbon and the magnetic properties of nano-Fe3O4, a recyclable and low-cost nano-Fe3O4 was designed to circumvent the problem that traditional water treatment materials cannot be reused and easily remained in water. This experiment is problem-based using Fe3O4@C composite materials as the carrier, to help students master the basic preparation of inorganic nano materials, performance characterization methods, improve students' ability of data processing and interpretation. This experiment provides a new comprehensive laboratory teaching mode, and the online teaching is adopted through the introduction, use and data software in learning of large instruments, while the offline practice is adopted for material preparation and wastewater treatment performance evaluation. This experiment overcame the weakness in traditional inorganic chemistry laboratory teaching, such as weak characterization methods and data processing training. This experiment can be used as a comprehensive experiment for inorganic chemistry, modern instrumental analysis and other theoretical courses.