The performance of nanomaterials is significantly determined by the interfacial microenvironment, in which a surfactant plays an essential role as the adsorbent, but its involvement in the interfacial reaction is often overlooked. Here, it was discovered that citrate and ascorbic acid, the two primarily used surfactants for colloidal gold nanoparticles (Au NPs), can spontaneously undergo catalytic reaction with trace-level nitrogenous residue under ambient environment to form oxime, which is subsequently cleaved to generate CN or a compound containing the -CN group. Such a catalytic reaction shows wide universality in both reactants, including various carbonaceous and nitrogenous sources, and metal catalysts, including Au, Ag, Fe, Cu, Ni, Pt, and Pd NPs.
View Article and Find Full Text PDFThe development of superwetting membranes is a promising approach for separating emulsified oily wastewater. However, challenges such as low flux without external pressure and membrane fouling have hindered membrane performance. Herein, we fabricated a novel nanofibrous membrane by grafting Co-doped Zr-UiO-66-NH (UiO(Zr/Co)) nanoparticles onto carboxylated cellulose nanocrystals (CCNC)-polyacrylonitrile (PAN) mixed matrix electrospinning membrane via chemical bonds through EDC/NHS reaction.
View Article and Find Full Text PDFIn this study, the oil sand was treated with an integrated process of pyrolysis and ball milling, and the obtained ball-milled carbon sand (BMCS) was utilized as peroxymonosulfate (PMS) activator to treat wastewater containing aniline (AN). Quenching experiments and electron paramagnetic resonance (EPR) confirmed the existence of sulfate radical (SO), hydroxyl radical (·OH) and singlet oxygen (O1) in the BMCS/PMS system. A probe-based kinetic model was constructed to describe the degradation process of pollutants in the BMCS/PMS system, quantified the exposure of each reactive oxygen species and their contributions to AN degradation.
View Article and Find Full Text PDFThis work aims to rapidly detect toxic alkaloids in traditional Chinese medicines (TCM) using laser desorption ionization mass spectrometry (LDI-MS). We systematically investigated twelve nanomaterials (NMs) as matrices and found that MoS and defect-rich-WO (D-WO) were the best NMs for alkaloid detection. MoS and D-WO can be used directly as matrices dipped onto conventional ground steel target plates.
View Article and Find Full Text PDFNovel imidazolium-based mass tags (IMTs) were designed, synthesized and applied to simultaneous analysis of multiple biomarkers on less than 10 cells. The high sensitivity, flexible extensibility and excellent distinguishability of IMTs open new avenues for designing common mass tag templates suitable for mass spectrometric immunoassay and provide an ideal option for multiplex-sensitive detection at the cellular scale.
View Article and Find Full Text PDFThe urgent threat of new psychoactive substances worldwide promotes rapid detection and identification demand for public security. Ambient ionization mass spectrometry (AIMS) has become mainstream among various detection techniques. Still, scant successful applications have been fulfilled toward dried blood spot (DBS) or plasma spot (DPS) as an easy-to-implement sampling format in AIMS.
View Article and Find Full Text PDFA simple mechanochemical (MC) method is used to treat petroleum-contaminated soil and prepare a heavy metal adsorbent in one step. XRD, Raman, FT-IR, VSM, BET, and XPS were used to characterize the adsorbent. After MC treatment, the dissolved total petroleum hydrocarbons of the adsorbent is less than 1 mg·L, and a porous structure and carbonization phenomenon are evident.
View Article and Find Full Text PDFWith regard to the treatment of multicomponent wastewaters, to construct multifunctional super-wetting membranes is highly attractive in current decade. In this work, a low-cost and novel NiFeO/TA/PVDF composite membrane was fabricated via a facile in-situ deposition method under vacuum system. In which, photo-response NiFeO nanoparticles were immobilized on the surface of flexible PVDF base membrane via hydrophilic tannic acid (TA) as the binder.
View Article and Find Full Text PDFThe release of antibiotics into the water environment can pose a serious threat to human and ecological health, so it is of great significance to effectively remove antibiotics from wastewater. In this work, porphyrinic zirconium metal-organic framework material, PCN-224, was first explored for the adsorption removal of antibiotics from water using tetracycline (TC) and ciprofloxacin (CIP) as examples. We prepared a series of PCN-224 with different particle sizes (150 nm, 300 nm, 500 nm, and 6 μm).
View Article and Find Full Text PDFA ternary photocatalyst, FeO-loaded g-CN/C-layered composite (g-CN/C/FeO) was fabricated by a facile sonication and in situ precipitation technique. Carbon nanosheets were prepared using the remaining non-metallic components of waste printed circuit boards as carbon sources. In this hybrid structure, g-CN was immobilized on the surfaces of carbon nanosheets to form a layered composite, and 10-15 nm FeO nanoparticles are uniformly deposited on the surface of the composite material.
View Article and Find Full Text PDFSingle-cell mass spectrometry (MS) remains challenging in the analysis of cells in the native environment due to the severe ion suspension from nonvolatile salts. Synchronous desalting and ionization would be ideal to both ensure the native environment and remove the salt interference. Here, a novel dual-spray ionization technique combining electrospray and nanoelectrospray ionization (ESI-nESI) was developed, enabling highly efficient online desalting during the ionization process.
View Article and Find Full Text PDFOxygen vacancies (OVs) defects in metal oxide-based photocatalysts play a crucial role in improving the charge carrier separation efficiencies to enhance the photocatalytic performances. In this work, OVs were introduced in 3D BiMoO microspheres through a facile and fast microwave-assisted method via the modulation of tetramethylethylenediamine (TMEDA). EPR, Raman and XPS results demonstrated that large amounts of oxygen vacancies were formed on the surface of BMO microspheres.
View Article and Find Full Text PDFIn this study, three-dimensional (3D) BiMoO microspheres were successfully fabricated by a facile, rapid, and mild microwave solvothermal strategy for the first time. The resultant 3D BiMoO microspheres exhibited superior adsorption capacity and photocatalytic efficiency in the degradation of the representative antibiotic ciprofloxacin under visible light, for which the reaction kinetic rate constant is 7.5 times as high as that of the as-synthesized zero-dimensional BiMoO nanoparticles.
View Article and Find Full Text PDFMass spectrometry imaging (MSI) is a powerful technique for investigating the biomolecular locations within tissues. However, the isomeric compounds are rarely distinguished due to inability of MSI to differentiate isomers in the probing area. Coupling tandem mass spectrometry with MSI can facilitate differentiating isomeric compounds.
View Article and Find Full Text PDFA new NiAlFe layered double hydroxide/polydopamine/polyvinylidene fluoride (NiAlFe LDH/PDA/PVDF) membrane was fabricated by in-situ growth of LDH on the PDA modified PVDF membrane. The as-prepared membrane possesses a nano/microscale rough structural surface and displays the superior wettability of superhydrophilicity in air and underwater superoleophobicity. Combining the favourable features of superwettability and hierarchical rough structure, the NiAlFe LDH/PDA/PVDF membrane could effectively separate a series of oil-in-water emulsions with high efficiency (>99%) and high permeation flux (925-1913 L m h bar).
View Article and Find Full Text PDFThe co-existing mechanism of visible light mediated direct oxidation and C-H functionalization of amines was investigated by capturing all the intermediates using online mass spectrometry. The two-step dehydrogenation of amine involving a proton coupled electron transfer (PCET) process was revealed for the first time.
View Article and Find Full Text PDFVisible-lightdriven C-TiO nanocomposites were prepared via a simple calcination and acid etching process. The C-TiO nanocomposites were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy, and high-resolution TEM. The results showed that TiO nanoparticles were combined with a porous carbon layer through surface C-O groups, which facilitates the strong interface interaction.
View Article and Find Full Text PDFThe physical properties of microparticles, such as mass, size, and density, are critical for their functions. The comprehensive characterization of these physical parameters, however, remains a fundamental challenge. Here, we developed a particle mass spectrometry (PMS) methodology for determining the mass, size, and density of microparticles simultaneously.
View Article and Find Full Text PDFThis study investigates the degradation of dimethyl phthalate (DMP) with hydrogen peroxide and ferrate (Fe(VI)) under various reaction conditions. The results showed that the optimum conditions for dimethyl phthalate removal from water were as follows: (a) pH 7.0 and (b) the original molar ratio of [Fe(VI)]/[HO]/[DMP] equal to 10:2:1.
View Article and Find Full Text PDFA novel environmental decalcifying agent was prepared with allylpolyethoxy amino carboxylate (APEAA), hydroxyethyl acrylate (HEA), and maleic anhydride (MA) by means of free-radical polymerization in an aqueous solution. The morphology and structure of the samples were characterized through scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectrometry, and H nuclear magnetic resonance (H NMR) spectra. The molecular-weight distribution of APEAA-HEA-MA was determined by the gel permeation chromatography method.
View Article and Find Full Text PDFCombining mass spectrometry (MS) with surface plasmon resonance (SPR) makes it possible to identify the chemical structures of the interacting molecules studied by SPR. Different approaches for coupling surface plasmon resonance sensors to mass spectrometry were developed. This article aims to summarize the established approaches and their applications to study biomolecular interactions.
View Article and Find Full Text PDFNano zerovalent iron (nZVI) and CaO were used to construct a heterogeneous Fenton-like system to degrade -hexachlorocyclohexane (-HCH) in soil solution, and the degradation efficiency and mechanism were investigated. The results showed that nZVI/CaO can degrade -HCH in an extensive pH range. When the dosage of nZVI and CaO was 1 g·L and pH was 5, the degradation rate of -HCH reached 93.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2018
This work developed a novel spermine-modified nanodiamonds (SP-NDs)-based method to selectively enrich oligonucleotides for matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) of human papillomavirus (HPV) virus. Our results showed that SP-NDs can effectively extract and enrich DNA oligonucleotides from sodium dodecyl sulfonate and urea solution. In addition, SP-NDs can also selectively extract oligonucleotides from enzymes digestion products of polymerase chain reaction-restriction fragment mass polymorphism (PCR-RFMP) of HPV virus.
View Article and Find Full Text PDFIt is crucial but of a great challenge to study in vivo and in situ drug release of nanocarriers when developing a nanomaterial-based drug delivery platform. We developed a new label-free laser desorption/ionization mass spectrometry (MS) imaging strategy that enabled visualization and quantification of the in situ drug release in tissues by monitoring intrinsic MS signal intensity ratio of loaded drug over the nanocarriers. The proof of concept was demonstrated by investigating the doxorubicin (DOX)/polyethylene glycol-MoS nanosheets drug delivery system in tumor mouse models.
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