Ling-Tao Kong

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (10)38.68 Total impact

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    ABSTRACT: This research was undertaken to evaluate the fluoride removal performance of 2-line ferrihydrite/bayerite composites (LFBC), which was prepared by a simple coprecipitation method. Batch experiments were performed to study the influence of various experimental parameters such as contact time, initial fluoride concentration, temperature, pH value and the presence of competing anions on the adsorption of fluoride on LFBC. The experiment data of adsorption kinetic and isotherm were fitted by nonlinear regression approach. With the low initial concentration of fluoride, the kinetic data were well fitted to pseudo-first-order model. In the case of high initial concentration, the kinetic data can be described by pseudo-second-order model. The Langmuir maximum adsorption capacity was 123.03 mg g−1 at pH 7.0. Thermodynamic parameters including the Gibbs free energy, standard enthalpy and standard entropy revealed that adsorption of fluoride on the LFBC was a feasible, spontaneous and exothermic process. Furthermore, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analysis revealed that the surface sulfate anions played important roles in the fluoride removal process, which was also confirmed by the investigation of the released sulfate anions in kinetic process. Findings of this work demonstrate the potential utility of the LFBC as an effective adsorbent for fluoride removal from water.
    Chemical Engineering Journal. 05/2015; 268.
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    ABSTRACT: Three-dimensional feather like bayerite/boehmite nanocomposites were synthesized by a facile one-pot hydrothermal method. The obtained nanocomposites were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption isotherms. The removal properties toward fluoride were investigated, including adsorption kinetics, adsorption isotherm, and influences of pH and coexisting anions. The maximal adsorption capacity was 56.80 mg g−1 at pH 7.0, which is favorable compared to those reported in the literature using other adsorbents. The coexisting of sulfate and bicarbonate inhibited the fluoride removal especially at high concentrations. Furthermore, the removal mechanism was revealed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results suggest that both of the surface hydroxyl groups and the nitrate anions were participated in the ion-exchange process.
    Journal of Colloid and Interface Science 11/2014; · 3.55 Impact Factor
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    ABSTRACT: Gold nanoparticles (AuNPs)/reduced graphene oxide (rGO) heterojunctions were synthesized directly on SiO2/Si substrates via seed-assisted growth process. The in-situ chemical fabrication strategy has been proven to be quite simple and efficient for generating highly active surface enhanced Raman scattering (SERS) substrates due to synergistic enhanced protocol from rGO and AuNPs. The SERS substrates with AuNPs/rGO heterojunctions have been utilized for trace-analysis of mercury (II) ions via Thymine-Hg2+-Thymine coordination. Thereby, very low limits of detection (LOD), i.e., 0.1 nM or 20 ppt for Hg2+, can be achieved in contrast with some other SERS subsrtates, which suggests that the heterojunctions are appropriate as versatile surface enhanced substrates applied in chemical or biosensing.
    ACS Applied Materials & Interfaces 07/2013; · 5.90 Impact Factor
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    ABSTRACT: Metal oxide gas sensors are predominant solid-state gas detecting devices for domestic, commercial and industrial applications, which have many advantages such as low cost, easy production, and compact size. However, the performance of such sensors is significantly influenced by the morphology and structure of sensing materials, resulting in a great obstacle for gas sensors based on bulk materials or dense films to achieve highly-sensitive properties. Lots of metal oxide nanostructures have been developed to improve the gas sensing properties such as sensitivity, selectivity, response speed, and so on. Here, we provide a brief overview of metal oxide nanostructures and their gas sensing properties from the aspects of particle size, morphology and doping. When the particle size of metal oxide is close to or less than double thickness of the space-charge layer, the sensitivity of the sensor will increase remarkably, which would be called "small size effect", yet small size of metal oxide nanoparticles will be compactly sintered together during the film coating process which is disadvantage for gas diffusion in them. In view of those reasons, nanostructures with many kinds of shapes such as porous nanotubes, porous nanospheres and so on have been investigated, that not only possessed large surface area and relatively mass reactive sites, but also formed relatively loose film structures which is an advantage for gas diffusion. Besides, doping is also an effective method to decrease particle size and improve gas sensing properties. Therefore, the gas sensing properties of metal oxide nanostructures assembled by nanoparticles are reviewed in this article. The effect of doping is also summarized and finally the perspectives of metal oxide gas sensor are given.
    Sensors 12/2012; 12(3):2610-31. · 2.05 Impact Factor
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    ABSTRACT: In the present work, the SnO(2)/graphene nanocomposite composed of 4-5 nm SnO(2) nanoparticles was synthesized using a simple wet chemical method for ppb-level detection of benzene. The formation mechanism of the nanocomposite was investigated systematically by means of simultaneous thermogravimetry analysis, X-ray diffraction, and X-ray photoelectron spectroscopy cooperated with transmission electron microscopy observations. The SnO(2)/graphene nanocomposite showed a very attractive improved sensitivity to toxic volatile organic compounds, especially to benzene, compared to a traditional SnO(2). The responses of the nanocomposite to benzene were a little higher than those to ethanol and the detection limit reached 5 ppb to benzene which is, to our best knowledge, far lower than those reported previously.
    Analytica chimica acta 07/2012; 736:100-7. · 4.31 Impact Factor
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    ABSTRACT: Tin oxide/multiwalled carbon nanotube (SnO2/MWCNT) heterojunctions were synthesized using the SnCl2 solution method. The interfacial structures, especially the interactions between the SnO2 and MWCNTs, were investigated by field emission scanning electron microscopy, transmission electron microscopy, ultrasonic destruction experiments, Raman spectroscopy, and thermal analysis. At the initial reaction stage, chemical bonds were the predominant interactions between the MWCNTs and SnO2. Physical interactions, including Coulomb interactions and van der Waals forces, play key roles under an increasing reaction time. Raman spectroscopy and thermal analysis proved to be two valid methods for the characterization of the interactions between SnO2 and MWCNTs. The strong interactions result in a low G/D strength ratio, as well as a low thermal stability of the MWCNTs in the SnO2/MWCNT heterojunctions. The binding energy of the MWCNTs and SnO2 was calculated based on differential thermal analysis and Hess's law and the results agreed with the interfacial morphological characteristics. This work presents a facile and low-cost approach to study the interfacial structures of carbon-based nanomaterials and opens a new possibility for investigating structural property relationships.
    RSC Advances 02/2012; 2(5):1942-1948. · 3.71 Impact Factor
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    ABSTRACT: Electrochemical detection of p-nitrophenol (P-NP) using a highly sensitive and selective platform based on single-walled carbon nanotube/pyrenecyclodextrin (SWCNT/PyCD) nanohybrids is described for the first time. The electrochemical performance of the SWCNT/PyCD nanohybrid electrode was fully compared with bare glassy carbon, single-SWCNT, single-PyCD, and SWCNT/CD (without pyrene rings) electrodes. Besides the techniques of cyclic voltammetry and chronoamperometric transients, differential pulse voltammetry (DPV) has been used for the detection of P-NP without any interference from o-nitrophenol (O-NP) at the potentials of -0.80 and -0.67 V, respectively. The SWCNT/PyCD nanohybrid electrode is highly sensitive, and it shows an ultrahigh sensitivity of 18.7 μA/μM toward P-NP in contrast to the values reported previously. The detection limit (S/N = 3) of the SWCNT/PyCD nanohybrid electrode toward P-NP is 0.00086 μM (0.12 ppb), which is well below the allowed limit in drinking water, 0.43 μM, given by the U.S. Environmental Protection Agency (EPA). The analytical performance of the SWCNT/PyCD nanohybrid electrode toward P-NP is superior to the existing electrodes.
    Langmuir 08/2011; 27(16):10295-301. · 4.38 Impact Factor
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    ABSTRACT: This work reports the first detailed study on an electrochemical impedance sensor for determination of polychlorinated biphenyl (PCB), such as 3,3',4,4'-tetrachlorobiphenyl (PCB-77), based on a single-walled carbon nanotube/pyrenecyclodextrin (SWCNT/PyCD) hybrid.
    Chemical Communications 03/2011; 47(18):5340-2. · 6.38 Impact Factor
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    ABSTRACT: This work reports a surface ion imprinting strategy in electropolymerized microporous poly(2-mercaptobenzothiazole) (MPMBT) films at the surface of glassy carbon electrode (GCE) for the electrochemical detection of Hg(II). The Hg(II)-imprinted MPMBT/GCE exhibits larger binding to functionalized capacity, faster binding kinetics and higher selectivity to template Hg(II) due to their high ratio of surface-imprinted sites, larger surface-to-volume ratios, the complete removal of Hg(II) templates and larger affinity to Hg(II). The square wave anodic stripping voltammetry (SW ASV) response of the Hg(II)-imprinted MPMBT/GCE to Hg(II) is ca. 3.0 and 5.9 times larger than that at the direct imprinted poly(2-mercaptobenzothiazole) modified GCE and non-imprinted MPMBT/GCE sensor, respectively; and the detection limit for Hg(II) is 0.1nM (which is well below the guideline value given by the World Health Organization). Excellent wide linear range (1.0-160.0nM) and good repeatability (relative standard deviation of 2.5%) were obtained for Hg(II). The interference experiments showed that mercury signal was not interfered in the presence of Pb(II), Cd(II), Zn(II), Cu(II) and Ag(I), respectively. These values, particularly the high sensitivity and excellent selectivity compared favorably with previously reported methods in the area of electrochemical Hg(II) detection, demonstrate the feasibility of using the prepared Hg(II)-imprinted MPMBT/GCE for efficient determination of Hg(II) in aqueous environmental samples.
    Analytica chimica acta 01/2011; 685(1):21-8. · 4.31 Impact Factor
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    ABSTRACT: Three-dimensional (3D) gold micro-/nanopore arrays containing 2-mercaptobenzothiazole (MBT) adapters have been prepared and employed to improve the performance of the determination of trace mercury in solution using square wave anodic stripping voltammetry (SWASV). 3D gold micro-/nanopore arrays have an active surface area which is up to 4 and 15 times higher than a two-dimensional (2D) bowl-like structured microarrays and a flat solid gold electrode characterized by cyclic voltammetry, respectively. In this study, 3D MBT molecular adapters on the array surface greatly decreased the effect of capacitive current and enhanced the sensitivity and selectivity of the electrode. A limit of detection of 0.02 nM (which is well below the guideline given by the World Health Organization) and more importantly, a sensitivity of 1.85 μA nM−1 was obtained using this system. Furthermore, excellent linear range (0.05–10 nM) and good repeatability (relative standard deviation of 2.10%) were obtained for Hg(II). Interference experiments were also investigated, and it was determined that Pb(II), Cd(II), Zn(II), Cu(II) and Ag(I) had little or no influence on the mercury signal.
    Electrochimica Acta 12/2010; 56(1):463-469. · 4.09 Impact Factor

Publication Stats

125 Citations
38.68 Total Impact Points


  • 2010–2012
    • Chinese Academy of Sciences
      • Institute of Intelligent Machines
      Peping, Beijing, China
  • 2011
    • Anhui Normal University
      • College of Life Sciences
      Wu-hu-shih, Anhui Sheng, China