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FexOy and ZrO2 nanoparticles co-doped layered porous polyimide, polyimide-FexOy-ZrO2 is prepared with a one-step strategy, shortly termed as PI-FexOy-ZrO2. The layered and porous structure of the polymer offers a supported platform for metallic oxide anchoring, exhibiting a mesopore size of 3.93 nm and providing a surface area of 198.47 m2 g−1. The metallic oxides were uniformly and highly dispersed...
Nitrogen enriched carbon dots (CDs) are prepared by hydrothermal treatment with oxalic acid and ethylenediamine serving as raw materials. The obtained CDs display strong blue fluorescence emission at λex/λem = 320/410 nm, along with a quantum yield of 14%. It is interesting to obtain a linear increase of fluorescence with the variation of pH value within pH 5.01–8.94. Meanwhile, a favorable stability...
Carbon dots were prepared via a one-pot hydrothermal route, and a new solid-phase extraction (SPE) adsorbent was developed by immobilizing the carbon dots on the microcarrier cytopore, shortly termed as C-dots@cytopore. The C-dots@cytopore composites were characterized by means of FT-IR, SEM, XPS and fluorescence spectrometry. The performance of the composites for the adsorption of heavy metals was...
A multifunctional drug nanocarrier is developed by incorporating acetaldehyde-modified-cystine (AMC) into mesoporous organosilica nanoparticles (MONs), shortly termed as MONs-AMC. The anticancer drug doxorubicin (DOX) links directly to MONs-AMC through electrostatic interaction between DOX and AMC to produce a conjugate, MONs-AMC-DOX, with a drug loading efficiency of 26.24 ± 1.35%, corresponding...
A suitable As(III)-binding ligand is the key to realize selective and sensitive As(III) sensing. In this study, phage display technique was used for the screening of As(III)-binding peptide. By negative screening against some representative metal cations and positive screening against target As(III), phages that bind to foreign metal cations were eliminated, while those bearing As(III)-binding peptides...
By virtue of the flexible structure of polyoxometalates, Ni2+ is encapsulated into trivacant lacunary tungstophosphate ligands by the form of [Ni4] cluster to offer a tetra-nickel substituted polyoxotungsate K6Na4[Ni4(H2O)2(PW9O34)2] (Ni4P2). The Ni4P2 is then immobilized onto the surface of SiO2 nanoparticles by self-assembly under electrostatic interactions to give the product of Ni4P2@SiO2 composites...
This work reports a facile electrolyzing method to synthesize boron-doped graphene quantum dots (BGQDs) and uses the BGQDs as a fluorescent probe to determine Fe3+ ion levels in water samples. The BGQDs were produced by oxidizing graphite in an aqueous borax solution at pH 7; then, the borate solution was filtered with BGQDs, and the borate was dialyzed from the filtrate, leaving a solution of BGQDs...
Acetone is a predominant volatile organic compound (VOC) in the exhaled breath and a promising biomarker for diabetes and ketoacidosis. A non-thermal micro-plasma generated in a planar dielectric barrier discharge (DBD) is used as a radiation source for the excitation of gaseous acetone followed by its quantification with optical emission spectrometry (OES). Gaseous acetone can be directly sampled,...
The organosilane-functionalized carbon dots (SiCDs) were synthesized using citric acid with N-(b-aminoethyl)-g-aminopropyl methyldimethoxy silane (AEAPMS). The as-synthesized SiCDs were characterized by IR, TEM, XPS, NMR and fluorescence. The SiCDs showed a strong emission at 455nm with excitation at 365nm. The SiCDs exhibited analytical potential as sensing probes for quercetin (QCT) determination...
A sensitive and selective electrochemical sensor based on molecular imprinting polymers grafted graphene (MIPs-G) was developed for simultaneous measurement of 4, 4-methylene diphenylamine (MDA) and aniline by differential pulse voltammetry (DPV). MIPs-G was synthesized via free radical polymerization reaction using MDA and 4-vinyl pyridine as template molecule and functional monomer respectively...
Considerable analytical methods have been developed for arsenic speciation in the last 5 years, the details of these new arsenic speciation procedures are thus summarized in present mini review. The performances of various sample pretreatment techniques including solid phase extraction, liquid–liquid extraction, hydride generation, liquid chromatography and capillary electrophoresis, which offer effective...
Graphene oxide (GO)–thionine (TH) nanocomposite was prepared by π–π stacking. The nanocomposite was cast-coated on a glassy carbon electrode (GCE) to prepare an electroreduced GO (ERGO)–TH/GCE, then 2-mercaptoethanesulfonate (MES) was covalently tethered to ERGO–TH by potentiostatic anodization to form an ERGO–TH–MES/GCE. The thiolation reaction was monitored by electrochemical quartz crystal microbalance...
Egg-shell membrane (ESM) is a promising adsorbent for heavy metal uptake. However, carboxylic groups on ESM surface barrier arsenic adsorption. Herein, ESM is modified by esterification and the methyl esterified egg-shell membrane (MESM) possesses positive charge within pH 1–9. As a novel green sorbent material, MESM exhibits 200-fold improvement on sorption capacity of arsenate with respect to bare...
A new turn-on fluorescence sensor based on xylenol orange (XO) functionalized CdSe/CdS quantum dots (QDs) is developed for the determination of lead ion. CdSe/CdS QDs were first modified by mercaptoacetic acid (MAA). The MAA-modified QDs were then capped with the natural biopolymer chitosan and the negatively charged XO. The XO-functionalized QDs were formed via the layer-by-layer self-assembly reaction...
In this study we developed a novel approach, using in-capillary formation of polymer/surfactant complexes (IPSC)–assisted reversed-migration MEKC (RM-MEKC), for the analysis of neutral steroids. This process involved two sequential events: in-capillary polymer/surfactant complexes formation during sample preconcentration, followed by IPSC separation. The procedure began with a polymer-filled capillary...
Doxorubicin (DOX) is an extensively used anthracycline that has proven to be effective against a variety of human malignant tumors, such as ovarian or breast cancer. While DOX was administered into cultured cancer cell targets (such as CHO-K1) in either free drug form or in drug carrier-associated form (i.e., DOX encapsulated in the drug delivery carrier), various action of mechanisms for DOX were...
A novel adsorbent was developed by coating Mg–FeCO 3 layered double hydroxides (LDHs) on cellulose fibre. The LDHs take up significant amount of selenite and selenate in a wide pH range with similar sorption capacities (pH 3.8–8.0 for selenite and pH 5.8–7.0 for selenate). A mini-column packed with Mg–FeCO 3 LDHs layer coated cellulose fibre particles was incorporated into a sequential...
In this paper, we reported an ultrasensitive ECL spectrometry for determination of DNA using magnetic streptavidin-coated nanobeads MNBs (SA-MNBs) as the carrier of Ru(bpy) 32+ -NHS, where bpy=2,2′-bipyridyl and NHS=N-hydroxysuccinimide ester, to amplify signal. The SA-MNBs were conjugated to the hybrids consisting of capture DNA, target DNA (t-DNA) and probe DNA immobilized on a substrate,...
A flow-through fluorescence optosensor with Sephadex G-50 microbeads as solid support is developed for the sensitive determination of tetracycline (TC). The fluorescent TC derivative encapsulated in CTAB micelle structures is retained onto the surface of the microbeads packed into a fluorescent flow cell in a flow system, followed by measurement of the native fluorescence of the TC derivative on the...
A novel adsorbent-silica gel bound dithizone (H 2 Dz-SG) was prepared and used as solid-phase extraction of copper from complex matrix. The H 2 Dz-SG is investigated by means of FT-IR spectra and the SEM images, demonstrating the bonding of dithizone. The H 2 Dz-SG quantitatively adsorb copper ions, and the retained copper is afterwards collected by elution of 10% (v/v) nitric...
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