Novel functional carbon dot based on Angelica residue and polyethyleneimine: A super-efficient corrosion and scale inhibitor.

The stability and high-dose addition of carbon dots in corrosion and scale inhibition are obstacles to their commercial application. Herein, we report a new type of functional CDs (PEI-CD) based on Angelica residue and polyethyleneimine (PEI), which can remarkably boost the performance of corrosion and scale inhibition, while expending the application of traditional Chinese medicine waste residue. At 303.

Rapid photocatalytic reduction of hexavalent chromium over Z-scheme MgInS/BiPO heterojunction: Performance, DFT calculation and mechanism insight.

The accumulation of highly fluid and biotoxic hexavalent chromium (Cr(VI)) impairs water ecosystems. It is urgent to quickly reduce Cr (VI) to trivalent chromium (Cr (III)) in wastewater. Hereby, Z-scheme MgInS/BiPO heterojunction was prepared, and MB-30 (mass ratio of BiPO to composite) presented a rapid Cr(VI) (10 mg L) removal efficiency of 100% within 10 min, its kinetic rate constant was 9.

ON-OFF Fluorescent Cyanine Dye Based on a Benzothiophenyl Rotor Enables Selective Illumination of G-Quadruplexes in Mitochondria.

Conventional cyanine dyes exist as "always-on" fluorescent probes leading to inevitable background signals which often limit their performance and scope of applications. To develop specific fluorescent probes with high sensitivity and robust OFF/ON switching for targeting G4s, we introduced aromatic heterocycles through conjugation with polymethine chains to construct a rotor-π system. Here, a universal strategy is presented to synthesize pentamethine cyanines with different aromatic heterocycle substituents on the -polymethine chain.

Modulating the electronic structure of ternary transition metal phosphide for enhanced hydrogen evolution activity.

Rationally designing ternary transition-metal phosphides (TMPs) for the hydrogen evolution reaction (HER) is desirable but remains a significant challenge. Herein, ternary FeCoNiP encapsulated in a porous carbon shell, coupled with N-doped carbon nanotubes (FeCoNiP@NCNTs) are synthesized a simple pyrolysis-phosphatization strategy derived from FeCoNi-MOF-100@dicyandiamide. Because Co/Ni enters the FeP lattice, FeCoNiP@NCNTs show a favorable catalytic performance towards the HER with low overpotential values of 86.

Ce-MOF/COF/carbon nanotube hybrid composite: Construction of efficient electrochemical immune platform for amplifying detection performance of CA125.

The combination of metal organic framework (MOF), covalent organic frameworks (COF) and carbon nanotube (CNT) forms a system due to their synergistic effect, thereby possessing the structural traits of individual components and exhibiting new properties. Herein, we successfully integrated terephthalonitrile-based-COF (TPN-COF)/CNT into the Ce-MOF, designed and synthesized Ce-MOF/TPN-COF/CNT hybrid material to construct a label-free immunosensor for specific detection of carcinomicantigen 125 (CA125). The synthesized composite exhibited abundant active sites and excellent electronic conductivity.

A novel pomegranate-inspired bifunctional electrode materials design for acetylcholinesterase biosensor and methanol oxidation reaction.

A pomegranate-inspired bifunctional electrode material based on Ni/NiO nanoparticle embedded in nitrogen-doped, partially graphitized carbon framework (Ni/NiO@NPGC) was designed and prepared for the construction of novel electrochemical biosensor and methanol oxidation reaction (MOR). Profiting from itsspecialstructureandfunction, Ni/NiO@NPGC was employed as a matrix immobilizing acetylcholinesterase (AChE) for methyl parathion (MP) sensor. The developed biosensor was proved to have wide linear range (1.

Indium sulfide deposited MIL-53(Fe) microrods: Efficient visible-light-driven photocatalytic reduction of hexavalent chromium.

The ecosystems and human health were seriously threatened by hexavalent chromium (Cr(VI)) in wastewater. In this article, using the idea of the highly matched energy band structure between indium sulfide (InS) and MIL-53(Fe), a Type-II heterojunction has been constructed by loading InS on MIL-53(Fe) microrod to overcome the fault like high recombination rates of photogenerated electron-holes of InS. The composite with 20:1 mass ratio of InS to MIL-53(Fe) (IM-2) was adopted as an optimal sample for efficient photocatalytic Cr(VI) reduction under visible light.

Controllable generation of ZnO/ZnCoO arising from bimetal-organic frameworks for electrochemical detection of naphthol isomers.

The development of a rapid and low concentration detection method for naphthol isomers is of great significance for protecting human health and environmental safety due to their high toxicity and strong corrosivity. Here, we reported a novel hollow ZnO/ZnCoO material derived by adjusting the molar ratio of Zn/Co of bimetal-organic frameworks (BMOFs) and its application for simultaneous detection of 1-naphthol (1-NAP) and 2-naphthol (2-NAP) by electrochemical methods. The oxidation peak currents of 1-NAP and 2-NAP on a ZnO/ZnCoO modified carbon paste electrode (ZnO/ZnCoO/CPE) depended linearly on their concentrations in the range of 0.

Metal composite oxides BiMoO/IL membrane as matrix for constructing ultrasensitive electrochemical immunosensor.

In the process of diagnosis and disease monitoring, it is important to quickly and easily detect protein biomarkers. The strategy reported here is an attempt to prepare BiMoO nanomaterial with new three-dimensional holes morphology surrounded by rod and sheet to construct a simple and sensitive sensing platform, where BiMoO/ionic liquid (IL) composite was modified on the carbon paste electrode (CPE). In order to monitor the assembly process of human IgG immunosensors, a plurality of electrochemical tests such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) was executed.

Dispersive solid-phase extraction based on MoS/carbon dot composite combined with HPLC to determine brominated flame retardants in water.

The method based on the dispersive solid-phase extraction (DSPE) by novel molybdenum disulfide modified with carbon dot (MoS/CD) composite combined with high-performance liquid chromatography (HPLC) was developed for the determination of three brominated flame retardants (BFRs), including tetrabromobisphenol A (TBBPA), tetrabromobisphenol A bisallylether (TBBPA-BAE), and tetrabromobisphenol A bis(2,3-dibromopropyl ether) (TBBPA-BDBPE). Owing to the stacked planar structure and large surface area of MoS, a large number of CDs can be easily loaded on the surface of MoS. Benefiting from good dispersing capability of MoS, similar density with analytes, and hydrogen bonds between CDs and the target analytes, the CDs on the surface of MoS as sorbent for the DSPE procedure exhibited good extraction performance.

Three MOF-Templated Carbon Nanocomposites for Potential Platforms of Enzyme Immobilization with Improved Electrochemical Performance.

An efficient and facile metal-organic framework (MOF)-template strategy for preparing carbon nanocomposites has been developed. First of all, a series of metal ions, including Fe, Zr, and La, were respectively connected with 2-aminoterephthalate (HATA) to form three metal-organic frameworks (MOFs) and then three novel MOF-derived materials were obtained by annealing them at 550 °C under N atmosphere. The morphologies and microstructure results showed that they still retained the original structure of MOFs and formed carbon-supported metal oxide hybrid nanomaterials.

Synthesis of reticulated hollow spheres structure NiCoS and its application in organophosphate pesticides biosensor.

Electrode materials play a key role in the development of electrochemical sensors, particularly enzyme-based biosensors. Here, a novel NiCoS with reticulated hollow spheres assembled from rod-like structures was prepared by a one-pot solvothermal method and its formation mechanism was discussed. Moreover, comparison of NiCoS materials from different experiment conditions as biosensors was investigated by electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV), and the best one that was reticulated hollow spheres assembled from rod-like structures NiCoS has been successfully employed as a matrix of AChE immobilization for the special structure, superior conductivity and rich reaction active sites.

Exploiting multi-function Metal-Organic Framework nanocomposite Ag@Zn-TSA as highly efficient immobilization matrixes for sensitive electrochemical biosensing.

A novel multi-function Metal-Organic Framework composite Ag@Zn-TSA (zinc thiosalicylate, Zn(C7H4O2S), Zn-TSA) was synthesized as highly efficient immobilization matrixes of myoglobin (Mb)/glucose oxidase (GOx) for electrochemical biosensing. The electrochemical biosensors based on Ag@Zn-TSA composite and ionic liquid (IL) modified carbon paste electrode (CPE) were fabricated successfully. Furthermore, the properties of the sensors were discussed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and amperometric current-time curve, respectively.

Fabric phase sorptive extraction: Two practical sample pretreatment techniques for brominated flame retardants in water.

Sample pretreatment is the critical section for residue monitoring of hazardous pollutants. In this paper, using the cellulose fabric as host matrix, three extraction sorbents such as poly (tetrahydrofuran) (PTHF), poly (ethylene glycol) (PEG) and poly (dimethyldiphenylsiloxane) (PDMDPS), were prepared on the surface of the cellulose fabric. Two practical extraction techniques including stir bar fabric phase sorptive extraction (stir bar-FPSE) and magnetic stir fabric phase sorptive extraction (magnetic stir-FPSE) have been designed, which allow stirring of fabric phase sorbent during the whole extraction process.

Environmentally Friendly Method: Development and Application to Carbon Aerogel as Sorbent for Solid-Phase Extraction.

We developed two simple, fast, and environmentally friendly methods using carbon aerogel (CA) and magnetic CA (mCA) materials as sorbents for micro-solid-phase extraction (μ-SPE) and magnetic solid-phase extraction (MSPE) techniques. The material performances such as adsorption isotherm, adsorption kinetics, and specific surface area were discussed by N2 adsorption-desorption isotherm measurements, ultraviolet and visible (UV-vis) spectrophotometry, scanning electron microscopy (SEM), and high resolution transmission electron microscopy (HR-TEM). The experimental results proved that the heterogeneities of CA and mCA were well modeled with the Freundlich isotherm model, and the sorption process well followed the pseudo-second-order rate equation.

Design synthesis of polypyrrole-Co3O4 hybrid material for the direct electrochemistry of Hemoglobin and Glucose Oxidase.

We designed and synthesized a novel organic-inorganic hybrid material polypyrrole-Co3O4 (Ppy-Co3O4), then mixed it with ionic liquid (IL) to form stable composite films for the immobilization of Hemoglobin (Hb) and Glucose Oxidase (GOD). The combination of Ppy and Co3O4 as well as IL created a platform with exceptional characteristics, and the content of Ppy had an effect on the direct electron transfer (DET) of Hb/GOD. Notably, when weight percentage of pyrrole monomer was 20%, the heterogenous electron transfer rate constant (ks) for Hb and GOD was estimated to be 1.

Determination of fungicides in sediments using a dispersive liquid-liquid microextraction procedure based on solidification of floating organic drop.

A dispersive liquid-liquid microextraction procedure based on solidification of floating organic droplet has been investigated for the determination of fungicides (cyprodinil, difenoconazole, myclobutanil, and spiroxamine) in sediments by HPLC with diode array detection. In the overall extraction process, the extraction solvents can be separated easily from the sample solution, and the experiment time was shortened. Moreover, several parameters such as the type and volume of the extraction solvent and dispersive solvent, centrifugal speed, extraction time, and salt effect that affect the extraction efficiencies of the target fungicides were studied and optimized.

The interaction of plant-growth regulators with serum albumin: molecular modeling and spectroscopic methods.

The affinity between two plant-growth regulators (PGRs) and human serum albumin (HSA) was investigated by molecular modeling techniques and spectroscopic methods. The results of molecular modeling simulations revealed that paclobutrazol (PAC) could bind on both site I and site II in HSA where the interaction was easier, while uniconazole (UNI) could not bind with HSA. Furthermore, the results of fluorescence spectroscopy, three-dimensional (3D) fluorescence spectroscopy and circular dichroism (CD) spectroscopy suggested that PAC had a strong ability to quench the intrinsic fluorescence of HSA.

Inorganic/organic doped carbon aerogels as biosensing materials for the detection of hydrogen peroxide.

In this article, three different inorganic/organic doped carbon aerogel (CA) materials (Ni-CA, Pd-CA, and Ppy-CA) were, respectively, mixed with ionic liquid (IL) to form three stable composite films, which were used as enhanced elements for an integrated sensing platform to increase the surface area and to improve the electronic transmission rate. Subsequently, the effect of the materials performances such as adsorption, specific surface area and conductivity on electrochemistry for myoglobin (Mb) was discussed using N2 adsorption-desorption isotherm measurements, scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). Moreover, they could act as sensors toward the detection of hydrogen peroxide (H2O2) with lower detection limits (1.

Ultrasonic-electrodeposition of hierarchical flower-like cobalt on petalage-like graphene hybrid microstructures for hydrazine sensing.

A facile, one-pot ultrasonic electrochemical method to synthesize hierarchical cobalt (Co)-nanoflowers on petalage-like graphene (GE) was developed. The hybrid microstructures were successfully evaluated as a new material for highly sensitive determination of hydrazine (N(2)H(4)). Scanning electron microscopic measurements displayed that the synthesized Co-GE exhibited a related hierarchical structure of a petalage-like GE homogeneous distribution as a matrix for the growth of smooth nanosheets-assembled Co nanoflowers.

Direct electrochemistry of hemoglobin immobilized in chitosan-room temperature ionic liquid film and application in its interaction with 3,4'-bis-(4-hydro-3-xycoumarin)-2,5-hexanediol.

The direct electrochemistry of hemoglobin (Hb) and application in its interaction with 3,4'-bis-(4-hydro-3-xycoumarin)-2,5-hexanediol (HCH) based on the Hb immobilized in chitosan-room temperature ionic liquid film were investigated by means of cyclic voltammetry, differential pulse voltammetry and amperometry. The binding ratio m and binding constant between HCH and Hb were estimated as 2 and 3.46 M(-1), respectively.

A novel nitrite biosensor based on gold dendrites with egg white as template.

Gold dendrites (AuD) were synthesized with egg white as the soft template and a novel nitrite (NO(2)(-)) biosensor was fabricated by assembly of a myoglobin (Mb)-L-cysteamine (Cys)-AuD biological hybrid. The results of Fourier transform infrared spectra and UV-visible spectra indicated that Mb retained its original structure in the resulting Mb-Cys-AuD. Electrochemical investigation of the biosensor showed a pair of well-defined, quasi-reversible redox peaks with E(pa) = -0.

Direct electrochemistry and electrocatalysis of hemoglobin in composite film based on ionic liquid and NiO microspheres with different morphologies.

Flowerlike, spherical, and walnutlike NiO microspheres were respectively mixed with ionic liquid (IL) to form three stable composite films, which were used to immobilize hemoglobin (Hb) on carbon paste electrodes. Spectroscopic and electrochemical examinations revealed that the three NiO/IL composites were biocompatible matrix for immobilizing Hb, which showed good stability and bioactivity. However, electrochemical studies demonstrated that flowerlike NiO microspheres were far more effective than the other two in adsorbing Hb and facilitating the electron transfer between Hb and underlying electrode, which resulted from its unique flower architecture and large surface area.

Electrochemical studies of the interaction of clarithromycin with bovine serum albumin.

The interaction of clarithromycin (CAM) with bovine serum albumin (BSA) was investigated in pH 4.5-8.0 phosphate buffer solutions in which three irreversible reduction waves P(1), P(2) and P(3) of CAM appeared on linear-sweep voltammetry on a static dropping mercury working electrode.

Voltammetric behavior of 4',7-dimethoxy-3'-isoflavone sulfonic sodium and its enhancement determination in the presence of surfactant.

Voltammetric behavior of 4',7-dimethoxy-3'-isoflavone sulfonic sodium (DISS) was studied by linear sweep voltammetry and cyclic voltammetry. DISS caused two waves between pH 8.0 and 12.