Hubei Provincial Research Institute of Environmental Science

Wuhan, China

Hubei Provincial Research Institute of Environmental Science

Wuhan, China
SEARCH FILTERS
Time filter
Source Type

Kang J.,CAS Research Center for Eco Environmental Sciences | Kang J.,Hubei Provincial Research Institute of Environmental Science | Liu H.,CAS Research Center for Eco Environmental Sciences | Zheng Y.-M.,National University of Singapore | And 2 more authors.
Journal of Colloid and Interface Science | Year: 2011

Extensive usage of tetracycline has resulted in its contamination in surface water and groundwater. The adsorption of tetracycline on zeolite beta was systematically investigated for the decontamination of the antibiotic polluted water in this study. Ninety percent of uptake by the zeolite beta occured in 0.25. h, and the adsorption equilibrium was obtained within 3. h, which was well described by an intraparticle diffusion model. The adsorption generally increased when pH was increased from 4.0 to 5.0, and then decreased significantly as the pH was further increased, which was caused by the pH-dependent speciation of tetracycline and surface charge of zeolite beta. Both Freundlich and Langmuir equations well described the adsorption isotherm. A thermodynamic analysis showed that the sorption process was spontaneous and endothermic. Aluminum atoms in the zeolite played a crucial role in the uptake; the adsorption increased with the increasing aluminum content in zeolite. The UV-Visible spectroscopy study showed that the spectra of tetracycline changed upon the interaction with zeolite beta, which could be ascribed to the formation of complexes of tetracycline and aluminum atoms in the zeolite surface. Nuclear magnetic resonance spectroscopy study further confirmed the participation of Al in the tetracycline adsorption. Fourier transform infrared spectroscopy studies showed that the amino functional groups in tetracycline were involved in the complexation with the zeolite surface. © 2010 Elsevier Inc.


Liu T.,Northwest University, China | Liu T.,Key Laboratory For Agriculture Rsrc And Environmental Remediation In Loess Plateau Of Agriculture Ministry Of China | Kang J.,Hubei Provincial Research Institute of Environmental Science | He L.-N.,Northwest University, China
Fresenius Environmental Bulletin | Year: 2011

Tetracycline is commonly used for agriculture feed additives, so land application of livestock and poultry manure may result in accumulation of tetracyclines in agricultural soil. The adsorption of tetracycline on loess soil, an important soil type in western China, was systematically investigated in this study. The results indicate that 85% of uptake by loess soil was completed in 5 h, and the adsorption equilibrium was obtained within 24 h, which was well described by the pseudo-second order kinetics model. The adsorption of tetracycline decreased when pH was increased from 3.0 to 5.0, then reached the maximum value as the pH increased to 7.0 or 8.0. After that, adsorption decreased greatly as the pH was further increased to 10.0. The adsorption of tetracycline decreased with the increase of ionic strength (from 0.01 to 1 M as KCl). The zeta potential of the loess soil significantly changed between pH 2-7 suggesting a strong interaction between tetracycline and loess soil. Moreover, both the Freundlich and Langmuir equations precisely described the adsorption isotherm (maximum adsorption capacity=22.2 mmol/kg). Furthermore, Fourier transform infrared spectroscopy studies showed that the functional groups of calcite in loess soil were involved in the adsorption of tetracycline. © by PSP.


Yi C.,Hubei Provincial Research Institute of Environmental Science | Yi C.,Chonbuk National University | Nirmala R.,Chonbuk National University | Navamathavan R.,Chonbuk National University | And 2 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2011

Nanoscaled photocrosslinkable polystyrene methylene cinnamate (PSMC) nanofibers were fabricated by electrospinning. The PSMC was prepared by the modification of polystyrene as a starting material via a two-step reaction process, chloromethylation and esterification. The chemical structure of PSMC was confirmed by 1H NMR and Fourier transform infrared spectroscopy (FT-IR). The photosensitivity of the PSMC was investigated using ultraviolet (UV) spectroscopic methods. Electrospun PSMC nanofiber mat showed excellent solubility in many organic solvents. UV irradiation of the electrospun mats led to photodimerization to resist dissolving in organic solvents. The morphology of the nanofiber was observed by scanning electron microscopy (SEM) and the result indicated that the average diameter of nanofibers is 350 nm and the crosslinked nanofibers were not collapsed after dipping into organic solvent showing good solvent-stability. This photocrosslinked nanofibers has the potential application in filtration, catalyst carrier and protective coating. Copyright © 2011 American Scientific Publishers. All rights reserved.


Peng T.,CAS Research Center for Eco Environmental Sciences | Peng T.,Hubei Provincial Research Institute of Environmental Science | Tu J.,CAS Research Center for Eco Environmental Sciences | Hu C.,CAS Research Center for Eco Environmental Sciences | And 2 more authors.
Journal of Chemical Technology and Biotechnology | Year: 2014

BACKGROUND: The plasmon-induced photocatalytic reduction of bromate (BrO3 -) was investigated in visible-light irradiated Au-Ag-AgI/Al2O3 suspension. The BrO3 - reduction process was studied in detail. RESULTS: The catalyst was found to be highly effective for the reduction of BrO3 - from pH 3 to 6. An enhancement of the electrical interaction between BrO3 - and the positively charged surface of the photocatalyst favored adsorption and reduction of BrO3 -. Organic compounds such as ethanol could react as sacrificial electron donors with excited holes (h+) on the metal nanoparticles (NPs) to accelerate electron transfer, inhibiting the release of metal ions and the recombination of h+ and electrons, hence promoting photocatalytic reduction of BrO3 -. Electron quenching and cyclic voltammetry studies under a variety of experimental conditions verified that BrO3 - trapped conduction band electrons of AgI from the excited metal NPs were reduced, competing with O2. CONCLUSION: The photocatalyst Au-Ag-AgI/Al2O3 exhibited particularly good reduction of BrO3 - under visible-light irradiation. The BrO3 - reduction was highly favored at acidic condition due to the greater adsorption of BrO3 - onto the catalyst. This finding indicates that this visible-light-driven catalyst could be applied to the reduction of some oxidative pollutants or even simultaneous removal of both oxidative and reductive pollutants. © 2013 Society of Chemical Industry.


Liu H.,CAS Research Center for Eco Environmental Sciences | Yang Y.,CAS Research Center for Eco Environmental Sciences | Yang Y.,University of Chinese Academy of Sciences | Kang J.,Hubei Provincial Research Institute of Environmental Science | And 2 more authors.
Journal of Environmental Sciences | Year: 2012

Significant concerns have been raised over the presence of antibiotics including tetracyclines in aquatic environments. A series of Fe-Mn binary oxide with different Fe:Mn molar ratios was synthesized by a simultaneous oxidation and coprecipitation process for TC removal. Results showed that Fe-Mn binary oxide had higher removal efficiency than that of hydrous iron oxide and hydrous manganese oxide, and that the oxide with a Fe:Mn molar ratio of 5:1 was the best in removal than other molar ratios. The tetracycline removal was highly pH dependent. The removal of tetracycline decreased with the increase of initial concentration, but the absolute removal quantity was more at high concentration. The presence of cations and anions such as Ca 2+, Mg 2+, CO 3 2- and SO 4 2- had no significant effect on the tetracycline removal in our experimental conditions, while SiO 3 2- and PO 4 3- had hindered the adsorption of tetracycline. The mechanism investigation found that tetracycline removal was mainly achieved by the replacement of surface hydroxyl groups by the tetracycline species and formation of surface complexes at the water/oxide interface. This primary study suggests that Fe-Mn binary oxide with a proper Fe:Mn molar ratio will be a very promising material for the removal of tetracycline from aqueous solutions. © 2012 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.


Nirmala R.,Chonbuk National University | Kim H.Y.,Chonbuk National University | Navamathavan R.,Chonbuk National University | Yi C.,Hubei Provincial Research Institute of Environmental Science | And 5 more authors.
Ceramics International | Year: 2012

SnO 2 doped TiO 2 electropsun nanofiber photocatalysts were successfully prepared by means of electrospinning process. The surface morphology, structure and optical properties of the resultant products were characterized by field-emission electron microscopy (FE-SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy, photoluminescence (PL) and cathodoluminescence (CL) techniques. The utilized physiochemical analyses indicated that the introduced SnO 2 doped TiO 2 nanofibers have a smooth surface and uniform diameters along their lengths. The photocatalytic performance of the composite nanofibers was tested for degradation of methylene blue (MB) and methyl orange (MO) dye solution under ultraviolet (UV) irradiation. Under the UV irradiation, the photocatalytic reaction rate in case of utilizing SnO 2-doped TiO 2 nanofibers was rapidly increased than that of the pristine TiO 2 nanofibers. Overall, this study demonstrates cheap, stable and effective material for photocatalytic degradation at room temperature. © 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Nirmala R.,Chonbuk National University | Kim H.Y.,Chonbuk National University | Yi C.,Hubei Provincial Research Institute of Environmental Science | Barakat N.A.M.,Chonbuk National University | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2012

In this study, Ni-doped titanium dioxide (TiO 2) electrospun nanofibers are introduced as novel material for dehydrogenation of ammonia borane (AB) complex. Hydrolysis experiments with introduced catalytic nanofibers are prevailed to rapidly release hydrogen from AB complex. Typically, Ni nanoparticles (NPs) behave as a catalyst, meanwhile the incorporation of nickel NPs lead to decrease in the electrons/holes recombination rate in TiO 2 which resulted in the increase of active ions in the solution to a rapid evolution of hydrogen gas at room temperature. The utilized physiochemical analyses indicate that the introduced Ni-doped TiO 2 nanofibers have a smooth surface and uniform diameters along their lengths. Under sunlight irradiation, the hydrogen production rate in case of utilizing Ni-doped TiO 2 nanofibers is rapidly increased compared to the pristine TiO 2 nanofibers, the maximum hydrogen equivalent in case of the doped nanofibers is 2.6 while the pristine one is 1.4. Both formulations exhibit almost equal low activity in daylight as the observed hydrogen equivalent is 0.4. Overall, this study proposes cheap, stable and effective material for AB dehydrogenation at room temperature. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Yi C.,Hubei Provincial Research Institute of Environmental Science | Yi C.,Chonbuk National University | Nirmala R.,Chonbuk National University | Barakat N.A.M.,Chonbuk National University | And 2 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2011

In this study, nanobranched TiO 2 nanofibers and silver loaded nanobranched TiO 2 nanofibers were prepared by electrospinning technique followed by TiCl 4 aqueous solution treatment and silver photodeposition method. Field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were employed to investigate the morphology of the products. X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) were conducted on the samples to study their chemical composition as well as crystallographic structure. The photocatalytic activities of these produced nanofibers were examined with two organic dyes, methylene blue and methyl orange, under ultraviolet (UV) light irradiation. The effect of nanobranches and silver modification on TiO 2 nanofibers was revealed in the photocatalysis process. The photocatalytic degradation rates of silver loaded on nanobranched TiO 2 nanofibers were 1.6 and 1.7 times as that of pure TiO 2 nanofibers in the presence of methylene blue and methyl orange, respectively, which indicated silver nanoparticles combined nanobranches modified on the surface of TiO 2 nanofibers could enhance the photocatalytic ability. © 2011 American Scientific Publishers.


PubMed | Hubei Provincial Research Institute of Environmental Science
Type: Journal Article | Journal: Journal of nanoscience and nanotechnology | Year: 2011

In this study, nanobranched TiO2 nanofibers and silver loaded nanobranched TiO2 nanofibers were prepared by electrospinning technique followed by TiCl4 aqueous solution treatment and silver photodeposition method. Field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were employed to investigate the morphology of the products. X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) were conducted on the samples to study their chemical composition as well as crystallographic structure. The photocatalytic activities of these produced nanofibers were examined with two organic dyes, methylene blue and methyl orange, under ultraviolet (UV) light irradiation. The effect of nanobranches and silver modification on TiO2 nanofibers was revealed in the photocatalysis process. The photocatalytic degradation rates of silver loaded on nanobranched TiO2 nanofibers were 1.6 and 1.7 times as that of pure TiO2 nanofibers in the presence of methylene blue and methyl orange, respectively, which indicated silver nanoparticles combined nanobranches modified on the surface of TiO2 nanofibers could enhance the photocatalytic ability.


PubMed | Hubei Provincial Research Institute of Environmental Science
Type: Journal Article | Journal: Journal of nanoscience and nanotechnology | Year: 2012

Nanoscaled photocrosslinkable polystyrene methylene cinnamate (PSMC) nanofibers were fabricated by electrospinning. The PSMC was prepared by the modification of polystyrene as a starting material via a two-step reaction process, chloromethylation and esterification. The chemical structure of PSMC was confirmed by 1H NMR and Fourier transform infrared spectroscopy (FT-IR). The photosensitivity of the PSMC was investigated using ultraviolet (UV) spectroscopic methods. Electrospun PSMC nanofiber mat showed excellent solubility in many organic solvents. UV irradiation of the electrospun mats led to photodimerization to resist dissolving in organic solvents. The morphology of the nanofiber was observed by scanning electron microscopy (SEM) and the result indicated that the average diameter of nanofibers is 350 nm and the crosslinked nanofibers were not collapsed after dipping into organic solvent showing good solvent-stability. This photocrosslinked nanofibers has the potential application in filtration, catalyst carrier and protective coating.

Loading Hubei Provincial Research Institute of Environmental Science collaborators
Loading Hubei Provincial Research Institute of Environmental Science collaborators