Identification of Omitted Pollutants in Environmental Water via In Situ Thin-Film Microextraction.

Sample preparation is an inevitable step in the screening workflow for the identification of unknown pollutants in the aquatic environment. However, the possible loss of pollutants during sample preparation has aroused serious concern but remains not effectively resolved. This study shows that high-risk pollutants omitted in solid-phase extraction (SPE) can be identified via in situ thin-film microextraction (TFME) coupled with high-resolution mass spectrometry.

Artificial neural network assisted the design of subwavelength-grating waveguides for nanoparticles optical trapping.

In this work, we propose artificial neural networks (ANNs) to predict the optical forces on particles with a radius of 50 nm and inverse-design the subwavelength-grating (SWG) waveguides structure for trapping. The SWG waveguides are applied to particle trapping due to their superior bulk sensitivity and surface sensitivity, as well as longer working distance than conventional nanophotonic waveguides. To reduce the time consumption of the design, we train ANNs to predict the trapping forces and to inverse-design the geometric structure of SWG waveguides, and the low mean square errors (MSE) of the networks achieve 2.

On-Site Ratiometric Analysis of UO with High Selectivity.

Uranyl ions (UO) are recognized as important indicators for monitoring sudden nuclear accidents. However, the interferences coexisting in the complicated environmental matrices impart serious constraints on the reliability of current on-site monitoring methods. Herein, a novel ratiometric method for the highly sensitive and selective detection of UO is reported based on a [Eu(diaminoterephthalic acid)] (Eu-DATP) metal-organic framework.

Green, mildly synthesized bismuth-based MOF for extraction of polar glucocorticoids in environmental water.

The complex sample matrix and low environmental concentration make it challenging to effectively determine the polar glucocorticoids. In particular, a green, economical, and environmentally friendly method is urgently needed, since a large amount of extraction solvents, samples, and extraction materials have been commonly used to improve the sensitivity of the reported methods. In this study, a green and robust phenol and bismuth-based MOF of SU101 was mildly synthesized and fabricated as a brand new solid-phase microextraction (SPME) fiber.

Novel lanthanide nanoparticle frameworks for highly efficient photoluminescence and hypersensitive detection.

Despite the excellent luminescent properties of lanthanide clusters (LnCs), their suprastructures that inherit their characteristic luminescent properties are scarcely reported. Herein, novel and highly luminescent suprastructures are synthesized a two-step assembly method to incorporate LnCs in covalent organic frameworks (COFs). COFs are pre-synthesized and decorated with rigid anchoring groups on their nanochannel walls, which provide one-dimensional confined spaces for the subsequent assembly of luminescent LnCs.

Calix[6]arene functionalized lanthanide metal-organic frameworks with boosted performance in identifying an anti-epidemic pharmaceutical.

A novel composite was fabricated by hybridizing terbium 1,3,5-benzenetricarboxylic MOF (TB-MOF) with Cx[6]. The obtained composite TB-Cx[6] possessed long-term stability and dispersion stability and was used for on-site analysis of the anti-COVID-19 disinfection product a combing remote sampling technique.

High-quality full-color carbon quantum dots synthesized under an unprecedentedly mild condition.

Carbon quantum dots (CQDs) are highly promising to be applied in light-emitting, chemosensing, and other cutting-edge domains. Herein, we successfully fabricate high-quality full-color CQDs under unprecedentedly low temperature and pressure (85°C, 1.88 bar).

PDMS-coated γCD-MOF solid-phase microextraction fiber for BTEX analysis with boosted performances.

Owing to the ubiquitous occurrence and chemotoxicity of BTEX (benzene, toluene, ethylbenzene and xylene), the development of stable and accurate analysis methods that can assess environment risks and can generate monitoring data rapidly is urgent. In this work, a new strategy was proposed for efficient detection of BTEX. By creatively utilizing thermal deposition method, a robust SPME fiber was fabricated, where the γCD-MOF acted as the adsorbent, while PDMS functionalized as the adhesive and protective coating.

Ratiometric fluorescent probe for the on-site monitoring of coexisted Hg and F in sequence.

The monitoring of mercury and fluoride ions (Hg and F) has aroused wide concerns owing to the high toxicity of Hg and the duplicitous nature of F to human health. As far as we known, more than 100 million people in poverty-stricken areas are still at high risk of being over-exposed to Hg and F via drinking water. Simple and cost-effective luminescent methods are highly promising for on-site water monitoring in rural areas.

Polymer Ligand-Sensitized Lanthanide Metal-Organic Frameworks for an On-Site Analysis of a Radionuclide.

Herein, a new strategy to increase the sensitivity of a lanthanide metal-organic framework (Ln-MOF) to UO was proposed by using polymeric ligands. By utilizing [Tb(1,3,5-benzenetrisbenzoate)]n (Tb-TBT) MOF as the host, preloaded 2-vinyl terephthalic acid (VTP) was polymerized in situ, which produced a novel fluorescent composite denoted as PVTP⊂Tb-TBT. Benefiting from the coordination of PVTP to the Tb nodes, the polymeric chains performed both as molecular scaffolds that improved the water stability of the framework and as additional antennae that sensitized the photoluminescence of the Tb nodes.

In vivo tracing of endogenous salicylic acids as the biomarkers for evaluating the toxicity of nano-TiO to plants.

Currently, nano-titanium dioxide (nTiO) is considered an emerging environmental contaminant. Bottlenecked by the traditional destructive and lethal sampling methods, nTiO's effect in living plants is poorly investigated. Here, in vivo tracing of endogenous salicylic acids at regular intervals was performed by using solid phase microextraction (SPME) technique for evaluating the effects of nTiO on plants.

Graphene Oxide-Supported Lanthanide Metal-Organic Frameworks with Boosted Stabilities and Detection Sensitivities.

The photoluminescent (PL) properties of lanthanide metal-organic frameworks (Ln-MOFs) are intrinsically subtle to water molecules, which remains the major challenge that severely limits their applications as fluorescent probes in aqueous samples. Herein novel composite fluorescent probes were prepared by growing Ln-MOFs (Tb-MOF, Eu-MOF, and Tb/Eu-MOF) on carboxylated porous graphene oxide (PGO-COOH). The 3D thorny composites presented significantly longer fluorescent lifetimes and higher quantum yields than that of the bare Ln-MOFs and exhibited long-term PL stabilities in aqueous samples up to 15 days.

Aggregation-induced fluorescence of the luminol-terbium(III) complex in polymer nanoparticles for sensitive determination of thrombin.

A fluorometric method is described for the determination of thrombin. Polymer nanoparticles containing the luminol-terbium(III) complex (luminol-Tb) were prepared where luminol acts as the bridging ligand, and Tb(III) acts as the central metal ion. Thrombin possesses a large number of electrons donating groups that coordinate with luminol-Tb.

An ultratrace assay of arsenite based on the synergistic quenching effect of Ru(bpy) and arsenite on the electrochemiluminescence of Au-g-CN nanosheets.

A novel ratiometric electrochemiluminescence (ECL) indicator has been constructed for ultratrace As(iii) detection based on the synergistic quenching of ECL emission of Au-g-C3N4 NSs using As(iii) and Ru(bpy)32+, meanwhile generating a new ECL signal of Ru(bpy)32+ with an increased intensity. Due to the dual quenching effect of As(iii) and Ru(bpy)32+ coupled with the generation of the second ECL signal of Ru(bpy)32+, the sensitivity and selectivity for detecting As(iii) are vastly enhanced.

Aggregation-induced emission of luminol: a novel strategy for fluorescence ratiometric detection of ALP and As(v) with high sensitivity and selectivity.

A novel dual-emission fluorescence ratiometric probe of luminol-Tb-GMP CPNPs for highly sensitive and selective detection of ALP and As(v) has been constructed based on the stimulus responsivity of luminol. The introduction of luminol as a ligand for Tb, combined with GMP, leads to a sensor which is more robust, sensitive, and efficient.