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Publications (8)3.14 Total impact

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    ABSTRACT: To identify the intermediates of 4-chlorophenol (4-CP) and bring forward the degradation pathways in the process of catalytic ozonation of 4-CP, 4-CP was ozonated with MnOx/γ-Al2O3/TiO2 (MAT) catalyst, and 4-CP was almost decomposed within 30 min, the mineralization reaching above 94.1% at 100 min. The evident reduction of the degradation with the addition of the radical scavenger tert-butanol (TBA) and the stronger spin-adduct signals of 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) indicated that 4-CP was oxidized primarily by hydroxyl radical (·OH). Analysis of GC-MS, HPLC and IC confirmed that aromatic compounds and carboxylic acids were predominant oxidative organic intermediates of 4-CP in catalytic ozonation.The main degradation steps were hydroxylation of 4-CP and the formation of hydroquinone, 4-chlororesorcinol and 4-chlorocatechol. The low molecular weight (LMW) acids, such as malic, malonic, oxalic, acetic, and formic acid, were formed from the further oxidation of the intermediates.
    Journal of Environmental Science and Health Part A Toxic/Hazardous Substances & Environmental Engineering 01/2014; 49(3):327-37.
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    ABSTRACT: Seasonal variation and influencing factors of perchlorate in snow, surface soil, rain, surface water, groundwater and corn were studied. Seven hundreds and seventy samples were collected in different periods in Harbin and its vicinity, China. Perchlorate concentrations were analyzed by ion chromatography-electrospray mass spectrometry. Results indicate that fireworks and firecrackers display from the Spring Festival to the Lantern Festival (February 2, 2011-February 17, 2011) can result in the occurrence of perchlorate in surface soil and snow. Perchlorate distribution is affected by wind direction in winter. Melting snow which contained perchlorate can dissolve perchlorate in surface soil, and then perchlorate can percolate into groundwater so that perchlorate concentrations in groundwater increased in spring. Perchlorate concentrations in groundwater and surface water decrease after rainy season in summer. Groundwater samples collected in the floodplain areas of the Songhua River and the Ashi River contained higher perchlorate concentrations than that far away with the rivers. The corns have the ability to accumulate perchlorate.
    Chemosphere 12/2012; · 3.14 Impact Factor
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    ABSTRACT: A comprehensive analytical method based on solid phase extraction-ion chromatography (SPE-IC) has been developed for the determination of trace perchlorate in groundwater. An amount of 0.7 liter of groundwater was enriched by a solid phase extraction column after pretreatment to remove the interference ions and then the column was eluted by 6 mL 1% NaOH solution. After filtration of the concentrated liquor with a filter membrane (0.45 microm), the liquor was analyzed on an ion chromatograph (IC) equipped with an Ion Pac AS20 separation column and a 50 microL injection loop, eluted with 40 mmol/L KOH solution. The method detection limit (MDL) and limit of determination (LOD) of perchlorate were 0.15 microg/L and 0.60 microg/L, respectively. The recovery was in the range of 99.7%-100.5% when the sampling concentrations were in the range of 1-15 microg/L. The method is economical and effective. It can be applied to determine trace perchlorate in groundwater. The perchlorate in groundwater samples got from the areas surrounding Harbin was determined by this method. The relative errors were in the range of 1.85%-9.24% between the results got by the SPE-IC and ion chromatography-tandem single quadrupole mass spectrometry.
    Se pu = Chinese journal of chromatography / Zhongguo hua xue hui 01/2012; 30(1):76-9.
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    ABSTRACT: Ion chromatography detection parameters optimizing and photocatalystic reduction were researched in this paper. Results showed that Taguchi method can improve the stability of ion chromatography detection state, and perchlorate can be reduced by photocatalyst method. This results gave a new image in the deep process of water.
    01/2011;
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    ABSTRACT: A novel photo-catalytic reactor of three-phase internal circulation fluidized bed was employed to the photodegradation of Rhodamine B with TiO2/SiO2 carried on porous silica as photocatalyst. The degradation kinetics of Rodaming B is investigated in the reactor. It is found that the degradation of Rodaming B conform hyperbola model, the reciprocal of degradation rate 1/X is proportional to the reciprocal of time 1/t. The reaction rate constant has no relation with initial reactant concentration and is proportional to the light density and volumetric rate of energy absorption. The reaction rate conforms the experiment results quite well, the average relative error being less 3.25%.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 12/2006; 27(11):2154-8.
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    ABSTRACT: A novel three-phase internal circulating fluidized bed photocatalytic reactor was established and the radiation transformation in which was investigated. The experimental results indicate that with the interaction of gas and solid (gas flux > 0.3m3/h), the radiation transformation in the reactor along radial direction conforms to a definite exponential function, which agrees to formula Rose about the rules of light intensity distribution through evenly suspended particles. The value of radiation energy is affected by the initial light intensity, the concentration of photocatalyst and the thickness of liquid layer. The aerated gas amount only influence the state of the fluidized bed and has little effect on the distribution of light intensity along radical direction. Photocatalytic degradation of Rhodamine B indicate that the efficiency of three-phase internal circulating fluidized bed is much higher than slurry bed. The optimal catalyst concentration of this system is 10 - 12g/L.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 02/2005; 26(1):112-6.
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    ABSTRACT: Perchlorate is not only a known health hazard for human but also one of the persistent inorganic pollutants. Some significant technologies have been carried out to remove or reduce perchlorate in water. A comprehensive review about these technologies is presented, including adsorption, membrane filtration, ion‐exchange (IX), biodegradation, chemical reduction, electrochemical reduction and bioelectrochemistry reduction. The mechanisms, influencing factors and practical applications of various technologies are discussed in detail. In particular, IX is the most effective technology for removing trace quantity perchlorate from drinking water, and biodegradation is suitable for large scale wastewater. Regrettably, there is no single technology that is perfect for complete perchlorate removal or reduction, although correlative studies are still in process. The integrated technologies, such as IX combined with biodegradation, may bring a glimmer of dawn and hope to the improvement of completely removing perchlorate from water.
    Desalination. 298:1–12.
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    ABSTRACT: Recent work is focused on photocatalytic reduction of aqueous perchlorate (ClO4-) by using Cu–TiO2/SiO2 catalysts in the presence of a hole scavenger (citric acid, Cit) in UV/Cu–TiO2/SiO2 system. The catalysts were prepared by the sol–gel dip-coating method using SiO2 as a support, tetrabutyl titanate and copper chloride as precursors. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), diffuse reflectance UV–Visible (DRS-UV–Vis) and X-ray photoelectron spectroscopy (XPS). The influences of copper content in catalysts, photogenerated electron, photogenerated hole, hydroxyl radical, initial pH and intermediates on photocatalytic perchlorate reduction were studied and the optimum reaction conditions were determined. Results indicate that the catalyst has the best catalytic activity when the nominal mass ratio of Cu2+ to TiO2 is 0.5%. The efficiency of perchlorate reduction in the presence of Cit (0.15 mM) can reach 56.0% after 140 min irradiation (368 ± 0.5 K) when the initial concentration of ClO4- was 0.001 mM. Cl− is identified as the end product and ClO4- concentration increases after Cit is exhausted. ClO3- is the main intermediate either in the course of ClO4-→Cl- in the presence of Cit or of Cl-→ClO4- in the absence of Cit in UV/Cu–TiO2/SiO2 system.
    Chemical Engineering Journal. 226:434–443.