Molecular imprinted hollow SnO 2 microspheres (Ho-SnO 2 @MIPs) integrated with boronate affinity ability were fabricated via atom transfer radical polymerization, and then they were adopted as ideal adsorbents for cis -diol containing luteolin (LTL) recognition and separation. Ho-SnO 2 @MIPs possessed uniform size (200 nm), porous and hollow structure, appropriate BET surface area (118.6 m 2 g −1 ), and high-density boronate affinity sites (0.22 mg m −2 ), endowing them highly specific uptake and fast separation properties. Due to the merit of pH responsive boronate affinity, the reversible interaction of boronic acid groups and LTL was regulated by the pH value facilely, which was benefit for the controlled recognition and release. In the batch mode experiments, the quick binding equilibrium (within 60 min) and a rather high specific binding capacity (46.81 mg g −1 ) at 298 K were observed, and Ho-SnO 2 @MIPs also displayed high rebinding selectivity to LTL. By a purification process, a commercially available LTL with 85% purity could be easily extracted and concentrated to 95.28% purity by Ho-SnO 2 @MIPs, and the purified products possessed the similar antibacterial performance with standard substance.
Novel photo-responsive hollow structured molecularly imprinted polymers (PHMIPs) were developed as a selective sorbent to recognize and separate analytes in complex samples. The PHMIPs were prepared using kaempferol (KAE) as the template, 4-[(4-methacryloyloxy) phenylazo] benzenesulfonic acid as a photo-responsive functional monomer, and hollow SnO2 (Ho-SnO2) as the support via free radical polymerization. The structure and physical properties of the developed polymers were characterized using different nano structural techniques and spectroscopy. Under alternating irradiation at 365 and 440 nm, the PHMIPs could release and uptake KAE, indicating that the template molecules can be easily bound to recognition sites and released back into solution. From adsorption experiments, the binding properties were evaluated, and the maximal adsorption capacity of the PHMIPs was 11.04 mg g−1. Furthermore, the developed PHMIPs showed high selectivity towards KAE compared to other compounds. Subsequently, the materials were successfully applied to the photo-controlled extraction of KAE from sea buckthorn leaves. The recoveries for KAE were higher than 90% and relative standard deviation values were between 1.81% and 2.53%, indicating the potential of the developed materials for use in extracting KAE from complex samples.
Xinting Han,Junyan Peng,Shaohua Jiang,Jian Xiong,Yu Song,Xiao Gong
Good mechanical and chemical stabilities are the key factors for the wide application of superhydrophobic surfaces. In this work, we first prepared raspberry-like hollow structured SnO2 nanoparticles using a simple hydrothermal method, followed by an annealing step. Then, the intrinsic raspberry-like hollow SnO2 nanoparticles were combined with hydrophilic SiO2 nanoparticles to construct rough surfaces with suitable hierarchical structures, and 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS-17) was used as a hydrophobic modifier of SnO2, while epoxy resin was used as an adhesive to prepare a superamphiphobic coating with good stability and durability. Such a coating can be applied on various substrates using a simple spray-coating or drop-coating method. The water contact angle and diiodomethane contact angle of the coating could reach up to ∼165 and ∼151°, respectively. After various chemical and mechanical stability tests including hot water treatment, salt water corrosion, strong adhesive tape peeling, and kneading, the coatings still remained amphiphobic. The facile fabrication of the robust superhydrophobic coating has great potential for applications in real life and industrial production.
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