Recently, visible-light-driven photocatalysis is of great interest in the environmental pollutant remediation. In the present study, a novel heterostructured photocatalyst AgI/BiVO4 was synthesized by an in situ precipitation procedure. The AgI/BiVO4 heterojunctions exhibited excellent photoactivity for the refractory pollutant (tetracycline (TC), a typical antibiotic) decomposition under visible light illumination. The synthetic sample with 1:4 mass ratio of AgI:BiVO4 possessed the highest photocatalytic performance in all of the as-prepared catalysts. The TC molecules were substantially eliminated (94.91%) within 60 min, and degradation efficiency was considerably better than those of bare BiVO4 (62.68%) and AgI (75.43%) under identical conditions. Simultaneously, 90.46% of TOC removal was also achieved within 120 min, suggesting that the mineralization was superior and further confirmed by three-dimensional excitation–emission matrix fluorescence spectroscopy (3D EEMs). The XRD, XPS, DRS, and PL measur...

Enhanced Photocatalytic Degradation of Tetracycline by AgI/BiVO4 Heterojunction under Visible-Light Irradiation: Mineralization Efficiency and Mechanism

Molecular imprinting-based solid-phase extraction (MI-SPE) has been in the spotlight to improve the recognition selectivity and detection sensitivity. MI-SPE provides a powerful tool for chemo/bioanalysis in complex matrices and meanwhile, benefits from distinguished advantages such as easy operation, high throughput, low cost, high selectivity and durability. This review proposed the recent advances in molecular imprinting concerning novel preparation strategies of molecularly imprinted polymers (MIPs) and typical applications of MI-SPE. Preparation strategies are highlighted by dividing into ten sections mainly including dummy imprinting, multi-template imprinting, surface imprinting, water-compatible imprinting, restricted access material combining imprinting etc.; each section provides the descriptions about what restrictions led to the emergence of any strategy, strengths/weaknesses of every strategy and universal applications of upgraded MIPs in various SPE modes prior to chromatographic analysis. The potential of MIPs for implementation in routine laboratory activities and scale-up is expected, and finally remaining challenges and future perspectives are proposed.

pdf/strategies-of-molecular-imprinting-based-solid-phase-1os1z7pgl9.pdf

Strategies of molecular imprinting-based solid-phase extraction prior to chromatographic analysis

Deep eutectic solvents, as an alternative to ionic liquids, have greener credentials than ionic liquids, and have attracted considerable attention in related chemical research. Deep eutectic solvents have attracted increasing attention in chemistry for the extraction and separation of various target compounds from natural products. This review highlights the preparation of deep eutectic solvents, unique properties of deep eutectic solvents, and synthesis of deep-eutectic-solvent-based materials. On the other hand, application in the extraction and separation of deep eutectic solvents is also included in this report. In this paper, the available data and references in this field are reviewed to summarize the applications and developments of deep eutectic solvents. Based on the development of deep eutectic solvents, an exploitation of new deep eutectic solvents and deep eutectic solvents-based materials is expected to diversify into extraction and separation.

Development of deep eutectic solvents applied in extraction and separation.

Novel magnetic multi-templates molecularly imprinted polymer for selective and rapid removal and detection of alkylphenols in water

Recent developments on AgI based heterojunction photocatalytic systems in photocatalytic application

Magnetic graphene oxide modified with choline chloride-based deep eutectic solvent for the solid-phase extraction of protein.

Preparation of magnetic chitosan and graphene oxide-functional guanidinium ionic liquid composite for the solid-phase extraction of protein

A novel visible-light-driven photocatalyst Ag/AgCl/CaTiO3 was successfully synthesized via a simple ultrasonic assisted precipitation–photoreduction process. The morphologies, phase structures as well as optical properties of the as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Raman spectra and photoluminescence emission spectra (PL). The photocatalytic activity of Ag/AgCl/CaTiO3 was examined by the photodegradation of rhodamine B (RhB) under visible-light irradiation. Experimental results showed that the composites exhibited higher photocatalytic activity than pure CaTiO3 and Ag/AgCl. Among them, the Ag/AgCl-5/CaTiO3 composite exhibited the optimal photocatalytic activity. The enhanced photocatalytic activity of the Ag/AgCl/CaTiO3 photocatalyst was attributed predominantly to the synergetic effect between the Ag/AgCl nanoparticles and the fern-like CaTiO3 nanoparticles, which was superior for the separation of photogenerated electrons and holes. Based on the band structure analysis and trapping experimental results, a possible photocatalytic mechanism for Ag/AgCl/CaTiO3 was put forward.

Synthesis of fern-like Ag/AgCl/CaTiO3 plasmonic photocatalysts and their enhanced visible-light photocatalytic properties

A novel ternary composite AgI/Ag/Bi2MoO6 photocatalyst was successfully synthesized by a facile hydrothermal method combined with an ultrasonic-assisted precipitation-photoreduction technique. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence emission spectra (PL) analysis were employed to characterize the composition, phase structures, crystallinity, morphologies and optical properties of the obtained catalysts. The experimental results indicated that the AgI/Ag/Bi2MoO6 (15.0%) composite display higher visible light photoactivity for organic pollutants degradation compared with pure Bi2MoO6 and Ag/AgI nanocrystals. On the basis of band structure analysis and active species trapping experimental results, the excellent photocatalytic performance of the AgI/Ag/Bi2MoO6 photocatalysts can be ascribed to the efficient electron transfer and lower recombination of photogenerated electron–hole pairs through the Z-scheme system. And the Ag nanoparticles act as the charge transmission bridge in the process. The physicochemical features and high degradation efficiencies were maintained after five cycling experiment, indicating that the samples exhibited good durability and stability. It is expected that the novel AgI/Ag/Bi2MoO6 hybrid is a promising candidate material for the environmental applications.

High-efficiency visible-light AgI/Ag/Bi2MoO6 as a Z-scheme photocatalyst for environmental applications

A magnetic solid-phase extraction (MSPE) procedure with a betaine-based ionic liquid (IL) coated 3-aminopropyltriethoxysilane (APTES)–Fe3O4 grafted graphene oxide (GO) nanocomposite (Fe3O4/APTES/GO/IL) as a magnetic adsorbent has been developed for protein extraction. A series of environmentally friendly ionic liquids (ILs) based on betaine and carboxylic acids have been prepared, and their structures have been confirmed by 1H nuclear magnetic resonance (1HNMR). Then the synthetic ionic liquids have been used to modify magnetic graphene oxide nanoparticles (Fe3O4/APTES/GO) to form Fe3O4/APTES/GO/IL. The as-prepared Fe3O4/APTES/GO/IL has been used to extract bovine serum albumin (BSA). After extraction, the concentration of protein in the supernatant was measured by UV-vis spectrophotometry. Several significant factors that affect the extraction amount, such as solution temperature, extraction time, protein concentration, ionic strength and pH value, were investigated. Experimental results show that the extraction amount could reach 139.1 mg g−1. The advantages of Fe3O4/APTES/GO/IL in protein extraction were compared with bare Fe3O4 nanoparticles and Fe3O4/APTES/GO. Moreover, the extraction process of protein from bovine calf whole blood by Fe3O4/APTES/GO/IL has been performed to evaluate the practical applicability of the proposed method.

Ionic liquid-coated Fe3O4/APTES/graphene oxide nanocomposites: synthesis, characterization and evaluation in protein extraction processes

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