Microfluidic Assembly Synthesis of Magnetic TiO2@SiO2 Hybrid Photonic Crystal Microspheres for Photocatalytic Degradation of Deoxynivalenol

Abstract

Mycotoxin contamination is a serious threat to food safety and human health. The development of efficient degradation strategies targeting mycotoxins is valuable. In this paper, magnetic TiO 2 @SiO 2 hybrid photonic crystal microspheres (MHPCMs) were designed and prepared by the water-in-oil droplet method through a simple two-phase home-made microfluidic device for the degradation of deoxynivalenol (DON), the most serious mycotoxin contaminating cereals and feeding samples among natural mycotoxins. The morphologies of the synthesized microspheres were investigated by both metallurgical microscope and scanning electronic microscope (SEM), confirming that MHPCMs have a spherical shape and regular photonic crystal nanostructures. In the self-assembly system, TiO 2 and Fe 3 O 4 nanoparticles were responsible to form photocatalytic sites and magnet response, respectively. The effect of the TiO 2 and Fe 3 O 4 contents in the microspheres on their morphology and photocatalytic degradation activity was studied in detail. Finally, the optimized MHPCM could degrade DON in water under the light irradiation and be recycled easily by magnet.

Three-Dimensional Ordered Macroporous Magnetic Inverse Photonic Crystal Microsphere-Based Molecularly Imprinted Polymer for Selective Capture of Aflatoxin B1

“…The MPCM was synthesized using a homemade microfluidic device through the self-assembly of SiO 2 , PS and Fe 3 O 4 nanoparticles in the silicane oil drop. 53 After solidification and removal of PS, 3D MPCM could be obtained. As shown in Figure 1, to covalently graft a MIP layer onto the MPCM, vinyl groups were first modified by use of the silica reagent MPS.…”

“…The MPCM was synthesized using a homemade microfluidic device through the self-assembly of SiO 2 , PS and Fe 3 O 4 nanoparticles in the silicane oil drop . After solidification and removal of PS, 3D MPCM could be obtained.…”

“…In this study, three-dimensional (3D) ordered macroporous magnetic inverse photonic crystal microspheres (MPCMs) with regular structures were prepared by a microfluidic self-assembly technique and used as the supporting materials. ,, The molecularly imprinted layer was grafted onto the vinyl-modified MPCM using analogues of AFB 1 as the dummy templates, methacrylic acid (MAA) as the functional monomer, and ethylene dimethacrylate (EGDMA) as the cross-linker. After polymerization, specific imprinted cavities formed after removal of the template molecules.…”