| Core-shell nanocomposites as a new multifunctional nanocomposite, has many excellent properties, such as regulatable-shell ratio, formation of self-assembly properties. It is expected that Core-shell nanocomposites are a promising candidate for applications in industrial catalysis, biochemical, lightweight material field, biosensors and detectors, and other micro-devices. But the core-shell structure of nano-materials preparation process is complex and multi-fine particles. It is difficult to recycle and re-use, limiting its practical application. In this paper, one-step method for the synthesis of the aerosol core-shell structure nanocomposites porous microspheres was studied, and the adsorption and recycling properties of the microspheres were dicussed.Magnetic microspheres with Fe3O4nanoparticle core and SiO2-TiO2hybrid shell were synthesized by a surfactant-aided aerosol process and subsequent treatment. The core-shell sphere with robust and chemically stable Ti-O-Si structure shell exhibited excellent adsorption performance toward basic dyes. High maximum adsorption capacities were obtained at147mg g-1for Methylene blue, and124.6mg g-1for Basic fuchsin. Methylene blue with an initial concentration of20mg L-1can be completely removed in5min at a dosage of0.5mg L-1, and the equilibrium time is90min in the initial MB concentration of20-250mg L-1. This can be associated with the strong electrostatic adsorption driving force between the spheres and dyes and abundant surface active sites on the adsorbent surface. The adsorption process is chemisorption in nature, while the adsorption kinetics followed the pseudo-second-order model. Furthermore, the dye saturated microspheres could be easily recycled by an external magnetic field and regenerated using1-3wt%NaOH aqueous solution. After six recycle runs, there was still98%of adsorption capacity retained. The low-cost magnetic hollow sphere with high adsorption capacity, facile preparation and recycling properties has the potential to be applied as a new type of efficient adsorbent for water treatment.After air calcination and HF treatment, Si single-shell microspheres and C single-shell microspheres were obtained from the synthesized of Si-C double shell microspheres. The example of a hierarchically structured hollow Si-C system is reported without any chemical modification to the enzyme involved in the process. The hierarchical architecture is composed of the ordered porous hollow Si-C spheres with a shell-in-shell structure. This rationally integrated architecture, which serves as the host for glucose oxidase immobilization, displays many significant advantages, including increases in mechanical stability, enzyme loading, and bioactivity. The adsorption capacities for glucose oxidase (GOx) were obtained at27mg g-1after3h. What is more, the equilibrium immobilization time is greatly reduced. Besides, the activity of the immobilized GOx is0.4U. This facilitates further multifarious applications for enhanced enzyme immobilization, biosensors, and biocatalysis. |
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