Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology

Zhangzhou, China

Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology

Zhangzhou, China

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Zhou H.,Zhangzhou Normal University | Chen J.,Zhangzhou Normal University | Huang T.,Zhangzhou Normal University | Chen D.,Zhangzhou Normal University | And 6 more authors.
New Journal of Chemistry | Year: 2017

As a biomass-derived precursor, pork liver, with rich nitrogen, iron, and carbon, was calcined, metal organic ligands were carbonized, and a uniformly distributed and in situ iron-nitrogen co-doped porous carbon material (N/Fe-C) could be prepared by a facile, low-cost synthetic method. Using N/Fe-C as an electrochemical selective sensor, a biochemical analysis platform was proposed. The neurotransmitter dopamine (DA), the purine metabolite uric acid (UA), and the most extensively employed drug paracetamol (PA) could coexist in real biological samples and used as models of bioelectroactive molecules. Compared with glassy carbon electrode (GCE), GCE modified with nitrogen-doped carbon (C/N/GCE) and N-C/GCE (i.e., the iron in N/Fe-C/GCE removed with nitric acid), the redox performance of N/Fe-C/GCE was improved approximately 18-fold, 6-fold, and 2-fold, respectively. Furthermore, the peak overlap among DA, UA, and PA and the interference of ascorbic acid, H2O2 and glucose could be avoided. These improvements were attributed to the uniform distribution of N, C and Fe, electrocatalytic activity of iron, excellent electrical conductivity of graphite-like carbon, large surface area (665.1 m2 g−1), and outstanding, but different, redox ability for DA, UA, and PA. N/Fe-C/GCE was utilized for rapid (in 30 s) and simultaneous determination of DA, UA, and PA. The linear range and detection limit (3 S/N) were in the range of 0.5-320 μmol L−1 and 10.6-79.0 nmol L−1, respectively. This method was used for the analysis of human blood serum with satisfactory results. The electrode of N/Fe-C/GCE remained effective for at least two weeks. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.


Huang M.-Q.,Zhangzhou Normal University | Huang M.-Q.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | Huang M.-Q.,Xiamen University | Cai S.-Y.,Zhangzhou Normal University | And 6 more authors.
Chinese Journal of Chemical Physics | Year: 2016

The gas phase hydration of glyoxal (HCOCHO) in the presence of sulfuric acid (H2SO4) were studied by the high-level quantum chemical calculations with M06-2X and CCSD(T) theoretical methods and the conventional transition state theory (CTST). The mechanism and rate constant of the five different reaction paths are considered corresponding to HCOCHO+H2O, HCOCHO+H2O⋯H2O, HCOCHO⋯H2O+H2O, HCOCHO+H2O⋯H2SO4 and HCOCHO⋯H2O+H2SO4. Results show that H2SO4 has a strong catalytic ability, which can significantly reduce the energy barrier for the hydration reaction of glyoxal. The energy barrier of hydrolysis of glyoxal in gas phase is lowered to 7.08 kcal/mol from 37.15 kcal/mol relative to pre-reactive complexes at the CCSD(T)/6-311++G(3df, 3pd)//M06-2X/6-311++G(3df, 3pd) level of theory. The rate constant of the H2SO4 catalyzed hydrolysis of glyoxal is 1.34×10-11 cm3/(molecule·s), about 1013 higher than that involving catalysis by an equal number of water molecules, and is greater than the reaction rate of glyoxal reaction with OH radicals of 1.10×10-11 cm3/(molecule·s) at the room temperature, indicating that the gas phase hydrolysis of glyoxal of H2SO4 catalyst is feasible and could compete with the reaction glyoxal+OH under certain atmospheric conditions. This study may provide useful information on understanding the mechanistic features of inorganic acid-catalyzed hydration of glyoxal for the formation of oligomer. © 2016 Chinese Physical Society.


Huang M.,Zhangzhou Normal University | Huang M.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | Huang M.,Xiamen University | Zhang J.,Zhangzhou Normal University | And 8 more authors.
Journal of Atmospheric Chemistry | Year: 2016

Inorganic seed particles have relatively large surface area, and play an important role in the formation and aging of secondary organic aerosol (SOA). The effects of dry (NH4)2SO4 which is the most commonly found in urban atmosphere on the aged benzene SOA were qualitatively studied utilizing aerosol laser time-of-flight mass spectrometer (ALTOFMS) coupled with Fuzzy C-Means (FCM) clustering algorithm in this study. Experimental results indicated that nitrophenol, oxocarboxylic acid, epoxide products are the predominant components in the aged benzene SOA in the presence of low concentration (about 10 μg m−3) of dry (NH4)2SO4. These aged products are the same as the previously obtained aged benzene SOA without (NH4)2SO4 seed aerosol, indicating that low concentration of dry (NH4)2SO4 acts just as the nucleation or condensation center of the SOA, and do not affect the chemical composition of SOA. However, 1 H-imidazole, 1 H-imidazole-2-carbaldehyde, hydrated 1 H-imidazole-2-carbaldehyde, 2,2′-biimidazole, hydrated N-glyoxal substituted 1 H-imidazole, N-glyoxal substituted hydrated 1 H-imidazole-2- carbaldehyde, hydrated mono glyoxal substituted hydrated 1 H-imidazole-2-carboxaldehyde, mono glyoxal substituted 2,2-biimidazole and hydrated glyoxal dimer substituted imidazole which are formed from ammonium ion reaction with glyoxal are the major particulate products in the aged benzene SOA in the presence of high concentration (about 100 μg m−3) of dry (NH4)2SO4. The retention of water on the dry (NH4)2SO4 particles creates ammonium ion, which can promote the formation of high-molecular-weight (HMW) products through multiphase reactions such as hydration and polymerization of aldehydes form from OH-initiated oxidation of benzene. © 2016 Springer Science+Business Media Dordrecht


Li S.-X.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | Li S.-X.,Zhangzhou Normal University | Lin X.,Zhangzhou Normal University | Zheng F.-Y.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | And 4 more authors.
Analytical Chemistry | Year: 2014

As a cheap and abundant porous material, cellulose filter paper was used to immobilize nano-TiO2 and denoted as TiO2/cellulose paper (TCP). With high adsorption capacity for Cu(II) (more than 1.65 mg), TCP was used as an adsorbent, photocatalyst, and colorimetric sensor at the same time. Under the optimum adsorption conditions, i.e., pH 6.5 and 25 °C, the adsorption ratio of Cu(II) was higher than 96.1%. Humic substances from the matrix could be enriched onto TCP but the interference of their colors on colorimetric detection could be eliminated by the photodegradation. In the presence of hydroxylamine, neocuproine, as a selective indicator, was added onto TCP, and a visual color change from white to orange was generated. The concentration of Cu(II) was quantified by the color intensity images using image processing software. This fully integrated visual analysis system was successfully applied for the detection of Cu(II) in 10.0 L of drinking water and seawater with a preconcentration factor of 104. The log-linear calibration curve for Cu(II) was in the range of 0.5-50.0 μg L-1 with a determination coefficient (R2) of 0.985 and its detection limit was 0.073 μg L-1. © 2014 American Chemical Society.


Zhou H.-F.,Zhangzhou Normal University | Li S.-X.,Zhangzhou Normal University | Li S.-X.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | Wu Y.-J.,Zhangzhou Normal University | And 5 more authors.
Sensors and Actuators, B: Chemical | Year: 2016

Using polydopamine as nitrogen-doped carbon precursors, adsorbent and reducing agent of HAuCl4, nitrogen and Au nanoparticle could be in situ doped and surface modified successively into/onto carbon spheres. The conductivity, electrons transfer ability, and electrocatalytic activity of carbon sphere were improved by the synergistic effect of surface modification with Au nanoparticle and nitrogen doping and then the sensitivity of this electrochemical sensor was enhanced. The synthesized nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Based on the difference of adsorption rates and oxidation potentials, both nitrophenol isomers (o-nitrophenol, m-nitrophenol, p-nitrophenol) and dihydroxybenzene isomers (hydroquinone, catechol, resorcinol) could be identified, separated successfully, and determined simultaneously by differential pulse voltammetry. This proposed method with wide linear range (0.05–600 μmol L−1) and low detection limit (24–98 nmol L−1) was successfully applied for simultaneous detection of nitrophenol and dihydroxybenzene isomers in wastewater and natural water. © 2016 Elsevier B.V.


Lin X.,Zhangzhou Normal University | Li S.-X.,Zhangzhou Normal University | Li S.-X.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | Zheng F.-Y.,Zhangzhou Normal University | Zheng F.-Y.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology
RSC Advances | Year: 2016

An integrative field analytical system was developed for the determination of Pb(ii) and Cd(ii). The system was based on the hyphenation of a preconcentration process with a portable X-ray fluorescence spectrometer. Preconcentration was accomplished with a composite consisting of TiO2 and a cellulose film (TCP) which was prepared by immobilizing TiO2 on cellulose filter paper. TCP is shown to be an adsorbent with high adsorption capacity, i.e., more than 254 μg per piece and 259 μg for Pb(ii) and Cd(ii), respectively. Under the optimum adsorption conditions, the best adsorption ratios of Pb(ii) and Cd(ii) were more than 95.5% and 94.4%, respectively. The preconcentration of Pb(ii) and Cd(ii) was not adversely affected by other metals ions and humic acid. Pb(ii) and Cd(ii) were then directly quantified by XRF. The calibration plots for both Pb(ii) and Cd(ii) were linear in the range from 1.0 to 50.0 μg L-1. The detection limits (3σ; for n = 11) for Pb(ii) and Cd(ii) were 0.69 and 0.51 μg L-1, respectively, and the levels of quantification were 2.30 and 1.71 μg L-1, respectively. The preconcentration factor was 103. Concentrations of Pb(ii) and Cd(ii) in drinking water and river waters were determined and found to be in agreement with ICP-MS assays. © The Royal Society of Chemistry 2016.


Li S.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | Li S.,Zhangzhou Normal University | Liang W.,Zhangzhou Normal University | Zheng F.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | And 3 more authors.
Nanoscale | Year: 2014

TiO2 photocatalysis and colorimetric detection are coupled with thin layer chromatography (TLC) for the first time to develop a fully integrated analysis system. Titania@polystyrene hybrid microspheres were surface modified with ascorbic acid, denoted AA-TiO2@PS, and used as the stationary phase for TLC. Because the affinity between AA-TiO2@PS and organophosphorus pesticides (OPs) was different for different species of OPs (including chlopyrifos, malathion, parathion, parathion-methyl, and methamidophos), OPs could be separated simultaneously by the mobile phase in 12.0 min with different Rf values. After surface modification, the UV-vis wavelength response range of AA-TiO2@PS was expanded to 650 nm. Under visible-light irradiation, all of the OPs could be photodegraded to PO4 3- in 25.0 min. Based on the chromogenic reaction between PO4 3- and chromogenic agents (ammonium molybdate and ascorbic acid), OPs were quantified from color intensity images using a scanner in conjunction with image processing software. So, AA-TiO2@PS was respectively used as the stationary phase of TLC for efficient separation of OPs, as a photocatalyst for species transformation of phosphorus, and as a colorimetric probe for on-field simultaneous visual detection of OPs in natural water. Linear calibration curves for each OP ranged from 19.3 nmol P L-1 to 2.30 μmol P L-1. This integrated analysis system was simple, inexpensive, easy to operate, and sensitive. © The Royal Society of Chemistry 2014.


Tu T.,Zhangzhou Normal University | Li S.,Zhangzhou Normal University | Li S.,Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology | Chen L.,Zhangzhou Normal University | And 4 more authors.
Aquatic Toxicology | Year: 2014

As traditional seafoods, the razor clams are widely distributed from tropical to temperate areas. Coastal razor clams are often exposed to eutrophication. Heavy metal contamination is critical for seafood safety. However, how eutrophication affects bioaccumulation and oral bioavailability of heavy metals in the razor clams is unknown. After a four-month field experimental cultivation, heavy metals (Fe, Cu, Ni, V, As, and Pb) could be bioaccumulated by the razor clams (Sinonovacula constricta) through exposure to metals present in water and sediments or in the food chain, and then transferred to human via consumption of razor clams. Bionic gastrointestinal digestion and monolayer liposome extraction are used for metal oral bioavailability (OBA) assessment. The influence of eutrophication on OBA is decreased for Fe and Pb and increased for V. A significant positive linear correlation was observed between the bioaccumulation factors of Fe, Ni, V, and As in razor clams and the coastal eutrophication. These results may be due to the effect of eutrophication on metal species transformation in coastal seawater and subcellular distribution in razor clams. The maximum allowable daily intakes of razor clams are controlled by eutrophication status and the concentration of affinity-liposome As in razor clams. © 2014 Elsevier B.V.


PubMed | Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology
Type: Journal Article | Journal: Nanoscale | Year: 2014

TiO photocatalysis and colorimetric detection are coupled with thin layer chromatography (TLC) for the first time to develop a fully integrated analysis system. Titania@polystyrene hybrid microspheres were surface modified with ascorbic acid, denoted AA-TiO@PS, and used as the stationary phase for TLC. Because the affinity between AA-TiO@PS and organophosphorus pesticides (OPs) was different for different species of OPs (including chlopyrifos, malathion, parathion, parathion-methyl, and methamidophos), OPs could be separated simultaneously by the mobile phase in 12.0 min with different Rf values. After surface modification, the UV-vis wavelength response range of AA-TiO@PS was expanded to 650 nm. Under visible-light irradiation, all of the OPs could be photodegraded to PO(3-) in 25.0 min. Based on the chromogenic reaction between PO(3-) and chromogenic agents (ammonium molybdate and ascorbic acid), OPs were quantified from color intensity images using a scanner in conjunction with image processing software. So, AA-TiO@PS was respectively used as the stationary phase of TLC for efficient separation of OPs, as a photocatalyst for species transformation of phosphorus, and as a colorimetric probe for on-field simultaneous visual detection of OPs in natural water. Linear calibration curves for each OP ranged from 19.3 nmol P L(-1) to 2.30 mol P L(-1). This integrated analysis system was simple, inexpensive, easy to operate, and sensitive.


PubMed | Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology
Type: Journal Article | Journal: Analytical chemistry | Year: 2014

As a cheap and abundant porous material, cellulose filter paper was used to immobilize nano-TiO2 and denoted as TiO2/cellulose paper (TCP). With high adsorption capacity for Cu(II) (more than 1.65 mg), TCP was used as an adsorbent, photocatalyst, and colorimetric sensor at the same time. Under the optimum adsorption conditions, i.e., pH 6.5 and 25 C, the adsorption ratio of Cu(II) was higher than 96.1%. Humic substances from the matrix could be enriched onto TCP but the interference of their colors on colorimetric detection could be eliminated by the photodegradation. In the presence of hydroxylamine, neocuproine, as a selective indicator, was added onto TCP, and a visual color change from white to orange was generated. The concentration of Cu(II) was quantified by the color intensity images using image processing software. This fully integrated visual analysis system was successfully applied for the detection of Cu(II) in 10.0 L of drinking water and seawater with a preconcentration factor of 10(4). The log-linear calibration curve for Cu(II) was in the range of 0.5-50.0 g L(-1) with a determination coefficient (R(2)) of 0.985 and its detection limit was 0.073 g L(-1).

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