Novel temperature-switched controlled release nanosystems based on molecular recognition of β-CD and thermosensitivity of PNIPAM phase transition of is developed.

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A novel type of multifunctional magnetic nanoparticle with highly chiral recognition capability, excellent thermo-sensitive adsorption and decomplexation properties toward amino acid enantiomers, and recyclability was developed in this study.

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BACKGROUND: Advanced oxidation processes based on sulfate radical have been widely employed for oxidation degradation of organic contaminants. Catalytic activation of peroxymonopersulfate (PMS) with transition metal oxides holds great promise for the generation of sulfate radical. In this work, laponite-decorated CoFe 2 O 4 porous nanostructures have been prepared through the thermal decomposition of laponite/oxalates, and evaluated as a magnetic catalyst to activate PMS for the oxidation of rhodamine B (RhB).RESULTS: The decoration of porous CoFe 2 O 4 microparticles with laponite was evidenced because of the presence of the vibration mode of Si O (at 1359 cm −1 ) in Fourier transform infrared spectra and the uniform distribution of Si and Mg elements from elemental mapping images. Decorating with laponite also resulted in an increase in amount of surface hydroxyl oxygen species, which facilitated the formation of Co OH complex for PMS activation. Furthermore, the enhanced activation of PMS with laponite-decorated CoFe 2 O 4 resulted in a faster removal (98.04%) of RhB as compared to undecorated CoFe 2 O 4 (79.62%) within 56 min. Meanwhile, the rate constant increased from 0.0288 (CoFe 2 O 4 ) to 0.0679 min −1 (laponite-decorated CoFe 2 O 4 ). The degradation rate of RhB progressively increased with reaction temperature and catalyst dosage. Scavenging and electron paramagnetic resonance tests manifested that the sulfate and superoxide radicals served as the major active species for the oxidation of RhB molecules. CONCLUSION:The above results demonstrated positive effects of laponite on the textural property, surface chemical states and catalytic activity of porous CoFe 2 O 4 microparticles. This study provides an insight into the promising role of laponite as an additive in improving PMS activation.