Synthesis and performance analysis of a mesoporous polydopamine-functionalized magnetic microcapsule adsorbent in water treatment

To scientifically and effectively solve the environmental and human hazards of polluted water bodies, this study uses the superparamagnetism of Fe3O4, the biocompatibility of mussel biomimetic polydopamine, and the large specific surface area and pore volume of mesoporous materials. Layer-by-layer self-assembled amino-functionalized modified nano-SiO2 particles were used to prepare mesoporous PDA-functionalized magnetic microcapsule adsorbents (FMNAs). After a series of microscopic characterization and performance measurement experiments, it can be concluded that the relatively large surface area (55.844m2/g) and pore volume (0.438 cm3/g) in the mesoporous structure of FMNAs provide a large number of active adsorption sites and exhibit high adsorption capacity for MB, AF and Cd (II), which are 42.35, 46.20 and 40.70 mg/g, respectively. The adsorption process of FMANs is mainly controlled by chemical adsorption, which conforms to Langmuir and Freundlich isothermal model, superparamagnetism gives FMNAs good repeatability.