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Whole pictures of halogenated disinfection byproducts in tap water from China＇s cities

Frontiers of Environmental Science & Engineering 2015年第1期9卷 121-130页

作者： Yang PAN Xiangru ZHANG jianping zhai State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210023 China Environmental Engineering Program Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China

When bromide/iodide is present in source water, hypobromous acid/hypoiodous acid will be formed with addition of chlorine, chloramine, or other disinfectants. Hypobromous acid/hypoiodous acid undergoes reactions with natural organic matter in source water to form numerous brominated/iodinated disinfection byproducts （DBPs）. In this study, tap water samples were collected from eight cities in China. With the aid of electrospray ionization-triple quadrupole mass spectrometry by setting precursor ion scans of m/z 35, m/z 81, and m/z 126.9, whole pictures of polar chlorinated, brominated, and iodinated DBPs in the tap water samples were revealed for the first time. Numerous polar halogenated DBPs were detected, including haloacetic acids, newly identified halogenated phenols, and many new/unknown halogenated compounds. Total organic chlorine, total organic bromine, and total organic iodine were also measured to indicate the total levels of all chlorinated, brominated, and iodinated DBPs in the tap water samples. The total organic chlorine concentrations ranged from 26.8 to 194.0 μg· L 1 as Cl, with an average of 109.2 μg·L-1 as Cl; the total organic bromine concentrations ranged from below detection limit to 113.3 μg·L-1 as Br, with an average of 34.7 μg·L-1 as Br; the total organic iodine concentrations ranged from below detection limit to 16.4 μg· L-1 as I, with an average of 9.1 μg· L-1 as I; the total organic halogen concentrations ranged from 31.3 to 220.4 μg·L-1 as Cl, with an average of 127.2 μg· L- 1 as Cl.

关键词： Disinfection byproducts (DBPs) total organichalogen tap water in China

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Preparation and Characterization of Buoyant Nitrogen-doped TiO_2 Composites Supported by Fly Ash Cenospheres for Photocatalytic Applications

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Journal of Materials Science & Technology 2013年第9期29卷 835-840页

作者： Chuang Li Bing Wang Hao Cui jianping zhai Qin Li State Key Laboratory of Pollution Control and Resource Reuse and School of the EnvironmentNanjing University

Fly ash cenospheres （FACs） coated with nitrogen-doped Ti02 （N-TiO2） composites were prepared by the sol-gel method for use as photocatalysts. The photocatalytic activity and kinetics of the composites produced at different calcination temperatures and with different nitrogen doping contents were studied under visible light irradiation by monitoring the environmental degradation of methylene blue （MB）. The MB degradation ratio of N-TiO2/FAC （25%, 450 ~C） was 10% higher than that of N-TiO2 and 40% higher than that of TiO2/FAC. These N-TJO2/FAC composites floated in water and could be recovered after the photocatalytic reaction by phase separation.

关键词： Nitrogen Photocatalyst Sol-gel core--shell particle Composite

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Synthesis of novel CeO_2–BiVO_4/FAC composites with enhanced visible-light photocatalytic properties

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Journal of Environmental Sciences 2014年第9期26卷 1936-1942页

作者： Jin Zhang Bing Wang Chuang Li Hao Cui jianping zhai Qin Li State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing University School of Biochemical and Environmental Engineering Nanjing Xiaozhuang University

To utilize visible light more effectively in photocatalytic reactions, a fly ash cenosphere （FAC）-supported CeO2-BiV04 （CeO2-BiVO4/FAC） composite photocatalyst was prepared by modified metalorganic decomposition and impregnation methods. The physical and photophysical properties of the composite have been characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and energy dispersive X-ray spectroscopy （EDX）, X-ray photoelectron spectroscopy （XPS）, and UV-Visible diffuse reflectance spectra. The XRD patterns exhibited characteristic diffraction peaks of both BiVO4 and Ce02 crystalline phases. The XPS results showed that Ce was present as both Ce4＋ and Ce3＋ oxidation states in Ce02 and dispersed on the surface of BiV04 to constitute a p-n heterojunction composite. The absorption threshold of the CeO2-BiVO4/FAC composite shifted to a longer wavelength in the UV-Vis absorption spectrum compared to the pure Ce02 and pure BiV04. The composites exhibited enhanced photocatalytic activity for Methylene Blue （MB） degradation under visible light irradiation. It was found that the 7.5 wt.% CeO2-BiVO4/FAC composite showed the highest photocatalytic activity for MB dye wastewater treatment.

关键词： Ce02BiV04Fly ash cenospheres (FACs)PhotocatalysisComposites

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Kerogen——as a sort of organic bearer of gold in gold-bearing formations

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Chinese Science Bulletin 1999年第11期44卷 1045-1050页

作者： Kai Hu jianping zhai Yingjun Liu Henian Wang Nanjing Univ Dept Earth Sci Nanjing 210093 Peoples R China Nanjing Univ State Key Lab Mineral Deposits Res Nanjing 210093 Peoples R China

Organic component, organic carbon and gold content analyses were used to study the relationship between gold mineralization and organic matter in major host rocks of three different chronological gold-bearing formations of South China. The results show that the organic matter of host rocks in various chronological major gold-bearing formations of South China has associated with gold mineralization in genesis. There is a positive correlation between gold and organic carbon in the host rocks of gold-bearing formations. Gold element was mainly enriched in insoluble organic matter——kerogen. Gold content of the kerogen is commonly higher from a few tens to several hundred times than that of the whole rocks, up to 5%—40% gold of the whole rocks. Gold remaining in the kerogen was considered an organic group of the kerogen to combine with ionic gold in solution through surface absorption, ion exchange complex reaction and chelation so that the kerogen could have become an important sort of organic bearer

关键词： kerogen gold-bearing formation organic bearer asphaltene.

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Synthesis, characterization and photocatalytic application of H_3PW_(12)O_(40)/BiVO_4 composite photocatalyst

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Science China Chemistry 2013年第9期56卷 1285-1292页

作者： ZHANG Jin LI Chuang WANG Bing CUI Hao zhai jianping LI Qin State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing University School of Biochemical and Environmental Engineering Nanjing Xiaozhuang University

A series of H3PW12O40/BiVO4 composite with different H3PW12O40 loadings were prepared using a hydrothermal and impregnation method. The prepared composites were characterized by XRD, Raman, SEM, XPS, and DRS techniques. The bandgap of the composite was narrower compared with the as-prepared pure BiVO4 . As a novel photocatalytic material, the photocatalytic performance of the H3PW12O40/BiVO4 composite was investigated by the degradation of methylene blue (MB) dye solution under visible light irradiation and compared with that of pure BiVO4 . The results revealed that the introduction of H3PW12O40 could improve the photocatalytic performance and different concentrations of H3PW12O40 resulted in different photocatalytic activities. The highest activity was obtained by the sample with a loading HPW concentration of 10 wt%. The reason for the enhanced photocatalytic activities of H3PW12O40/BiVO4 samples was also discussed in this paper. Moreover, the H3PW12O40/BiVO4 composites retained the catalytic activity after four repeated experiments.

关键词： bismuth vanadate (BiVO 4 ) heteropoly acid (HPA) photocatalysis visible-light-responsive composite materials

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Synthesis of CeO_2/fly ash cenospheres composites as novel photocatalysts by modified pyrolysis process

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Journal of Rare Earths 2014年第12期32卷 1120-1125页

作者：张进王冰崔皓李闯翟建平李琴 State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University School of Biochemical and Environmental Engineering Nanjing Xiaozhuang University

A novel fly ash cenospheres（FACs）-supported CeO2 composite（CeO2/FACs） was successfully synthesized by the modified pyrolysis *** prepared composites were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, and diffuse reflection spectra（DRS） *** results indicated that the CeO2 film coated on cenospheres was a face-centered cubic *** images confirmed that the CeO2 film was relatively *** results showed that Ce was present as both Ce4＋ and Ce3＋ oxidation states in CeO2 film coated on FACs *** bandgap of the composite was narrower compared with the pure *** as-prepared material exhibited good photocatalytic activity for the decolorization of methylene blue（MB） under visible light irradiation, and the first-order reaction rate constant（k） of 0.0028 min–1 for CeO2/FACs composite was higher than 0.0015 min–1 of pure *** fact that they floated on water meant that CeO2/FACs composites were easily recovered from water by filtration after the *** recycling test revealed that the composites were quite stable during the MB photocatalytic *** CeO2/ FACs catalyst was therefore promising for practical use in the degradation of pollutants or water cleanup.

关键词： CeO2 fly ash cenospheres(FACs) photocatalysis modified pyrolysis process rare earths

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A sulfur isotope study of fine disseminated gold deposits in the Yunnan-Guizhou-Guangxi triangle area

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Chinese Science Bulletin 1999年第S2期44卷 180-182页

作者： LU jianjun, zhai jianping, CHEN Xiaoming and GAO Jianfeng State Key Laboratory of Mineral Deposit Research, Nanjing University, Nanjing 210093, China State Key Laboratory of Mineral Deposit Research Nanjing University Nanjing 210093 China

THE fine disseminated gold deposits in Yunnan-Guizhou-Guangxi triangle area in S. China occur in thesedimentary rocks and are not relative to magmatism in space and genesis. Many authors have studiedthese deposits and obtained different conclusions. This note makes the first systematic study on sulfur isotope compositions to further discuss possible sources of ore-forming materials. 1 Sulfur isotope composition Figure 1 shows variations of sulfur isotope compositions of 232 sulfide separats from various depositsand their host rocks. S S values of pyrite from Mid-Triassic Banna Formation strata in the Jinya ore district can be divided into two groups: -7.4‰ to -6.4‰ and 2.7‰ to 14.1‰. Pyrite from the Jinyadeposits has δ34S values of -7.2‰-1.9‰, stibnite -6.7‰- -4.9‰ and arsenopyrite -4.1‰-

关键词： sulfur isotope fine disseminated gold deposits Yunnan Guizhou Guangxi.

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Hydrogen and oxygen compositions of altered rocks from Qixia gold deposit and their genetic significance, Shandong, China

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Chinese Science Bulletin 1999年第S2期44卷 8-9页

作者： zhai jianping, LU Jianjun, HU Kai and XU Guangping Department of Earth Sciences, State Key, Laboratory of Mineral Deposits, Nanjing University, 210093, China Department of Earth Sciences State Key Laboratory of Mineral Deposits Nanjing University 210093 China

1 Sample and analytic methods The Qixia gold deposit is one of the important quartz vein-type deposits hosted in metamorphic rockin east Shandong Province, China. About 12 samples were collected at different depths of the Qixia goldmineral district to investigate the variations in the hydrogen and oxygen isotope compositions of alteredrocks. Hydrogen was extracted by melting samples and oxygen was obtained through oxidation by BrF5.The isotope compositions were measured with MAT252, and the precisions for oxygen and hydrogen isotope analyses were±0.2‰ and 2‰, respectively. All the analyses were fulfilled at the State Key *** Mineral Deposit Research in Nanjing University. The δD and δ18O values relative to SMOW are givenin table 1.

关键词： hydrogen and oxygen isotopes altered rocks Qixia gold deposit Shandong.

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