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Science china chemistry 2012年第4期55卷 626-631页

作者： MA Xing1,2,LIU Jun1,DU YuGuo1,2,WEI GuoHua1 & WEI DongBin1 1State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences,chinese academy of sciences,beijing 100085,china 2college of chemistry and chemical engineering,graduate university of chinese academy of sciences,beijing 100049,china 1. State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences Chinese Academy of Sciences Beijing 100085 China2. College of Chemistry and Chemical Engineering Graduate University of Chinese Academy of Sciences Beijing 100049 China

A novel fluorescence ＂turnon＂ probe for CH^2＋ detection has been designed based on a Cu^2＋ triggered spirolactam ringopening reaction. The synthetic probe is a doubleresponsive fluorescent and colorimetric Cu^2＋specific sensor. In aqueous solution, it exhibits high selectivity and excellent sensitivity. With a significant color change visible to the naked eye at the concentration of 3 *** （ca. 0.19 mg/L）, about one magnitude lower than the WHO （World Health Organization） recommended level （2.0 mg/L） for Cu^2＋ions in drinking water, the probe could be used to monitor Cu^2＋ ions in drinking water.

关键词： copper – fluorescent chemosensor – chromogenic probe – rhodamine

Applications of synchrotron-based X-ray techniques in environmental science

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Science china chemistry 2010年第12期53卷 2529-2538页

作者： LUO Lei & ZHANG ShuZhen State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences,chinese academy of sciences,beijing 100085,china 1. State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences Chinese Academy of Sciences Beijing 100085 China

Synchrotron-based X-ray techniques have been widely applied to the fields of environmental science due to their element-specific and nondestructive properties and unique spectral and spatial resolution *** techniques are capable of in situ investigating chemical speciation,microstructure and mapping of elements in question at the molecular or nanometer scale,and thus provide direct evidence for reaction mechanisms for various environmental *** this contribution,the applications of three types of the techniques commonly used in the fields of environmental research are reviewed,namely X-ray absorption spectroscopy (XAS),X-ray fluorescence (XRF) spectroscopy and scanning transmission X-ray microscopy (STXM).In particular,the recent advances of the techniques in china are elaborated,and a selection of the applied examples are provided in the field of environmental ***,the perspectives of synchrotron-based X-ray techniques are *** their great progress and wide application,the techniques have revolutionized our understanding of significant geo-and bio-chemical *** is anticipatable that synchrotron-based X-ray techniques will continue to play a significant role in the fields and significant advances will be obtained in decades ahead.

关键词： synchrotron spectroscopy spectromicroscopy environmental science

Lack of nano size effect on electrochemistry of dopamine at a gold nanoparticle modified indium tin oxide electrode

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Science china chemistry 2010年第8期53卷 1778-1783页

作者： HUANG RongFu & GUO Liang-Hong State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences,chinese academy of sciences,beijing 100085,china 1. State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences Chinese Academy of Sciences Beijing 100085 China

Nanometer sized materials have been shown to possess excellent chemical and electrochemical catalytic *** this work,a gold nanoparticle (AuNP) modified indium tin oxide (ITO) electrode was employed for investigating its electro-catalytic *** was deposited on the 3-aminopropyltriethoxysilane (APTES) modified ITO electrode by self-assembly,and was characterized by scanning electron microscopy and cyclic *** the electrochemical reaction of dopamine was very sluggish on the ITO/APTES electrode,it was significantly enhanced after AuNP *** cyclic voltammogram exhibited apparent dependence on the surface coverage of 11 nm AuNPs,which could be rationalized by different modes of mass *** the different sizes of AuNP investigated,the lowest anodic peak potential was observed on 11 nm ***,the potential was still about 50 mV more positive than that obtained on a bulk gold electrode of similar *** is therefore concluded that there is no nanometer size effect of AuNP modified ITO on the electrochemistry of dopamine.

关键词： gold nanoparticle dopamine electrocatalysis indium tin oxide

A novel integrated step-feed biofilm process for the treatment of decentralized domestic wastewater in rural areas of china

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Journal of environmental sciences 2010年第3期22卷 321-327页

作者： Hanwen Liang, Min Gao, Junxin Liu, Yuansong Wei, Xuesong Guo research center for eco-environmental sciences, chinese academy of sciences, beijing 100085, china. [a] research center for eco-environmental sciences Chinese Academy of Sciences Beijing 100085 China

For wastewater treatment in rural areas, a novel three-stage step-feed wastewater treatment system, combined with a drop-aeration biofilm process, was tested in the laboratory to investigate its performance in removing suspended solids （SS）, chemical oxygen demand （COD）, NH4＋-N, total nitrogen （TN）, and total phosphorus （TP）. The removal rates of SS, COD and NH4＋-N were 90%, 80%, and 90% in efluent concentrations less than 10 mg/L, 50 mg/L and 8 mg/L, respectively. The TP removal rate was less satisfactory. The C/N ratio in the raw wastewater was often less than 3.5, and the removal efficiency of TN was therefore limited. A carbon-release batch experiment was carried out to measure the feasibility of enhancing denitrification at low influent C/N ratios. The result showed that the C/N could be over 9.0 in the supernatant. Polymerase chain reaction denaturing gradient gel electrophoresis technology was used to reveal the changes in the bacterial community during different stages of the integrated step-feed biofilm process. The results showed that banding patterns and the distribution of dominant bands for the same experimental period in different aerobic zones were similar. Phylogenetic analysis indicated that lanes 10, 11 and 12, which presented three aerobic zones at the same operation period, had the closest phylogenetic relationship among the lanes.

关键词： step-feed biofilm removal efficiency PCR-DGGE C/N ratio

Effects of combined substitution of Dy and Mo or Si on the crystal structures and magnetic properties of Nd_(1-y)Dy_yFe_(11-x)TiM_x(M=Mo,Si) compounds

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Science china chemistry 2009年第8期52卷 1097-1103页

作者： LI XiangJun,ZHENG Na,HU ZhongBo & YUAN ZhuoBin college of chemistry and chemical engineering,graduate university of chinese academy of sciences,beijing 100049,china 1. college of chemistry and chemical engineering Graduate University of Chinese Academy of Sciences Beijing 100049 China

A series of Nd1-yDyyFe11-xTiMx(M=Mo,Si) alloys have been prepared by arc melting and studied by X-ray diffraction and neutron *** samples are found to crystallize in the ThMn12-type *** lattice parameters a and c and unit cell volume V of Nd0.5Dy0.5Fe11-xTiMox alloys increase linearly with increasing content of Mo(x),while the lattice parameters a and c and unit cell volume V of Nd0.5Dy0.5Fe11-xTiSix alloys decrease linearly with increasing content of Si(x).In NdyDy1-yFe11-xTiMx(M=Mo,Si) compounds,Ti and Mo atoms preferentially occupy the 8i sites and Si atoms preferentially occupy the 8j and 8f *** measurements show that the substitution of Fe by either Mo or Si leads to a decrease in the Curie temperature.

关键词： rare earth-transition metal compounds crystal structure X-ray diffraction neutron diffraction

Temperature-controlled ionic liquid dispersive liquid phase microextraction combined with ultra-high-pressure liquid chromatography for the rapid determination of triclosan,triclocarban and methyl-triclosan in aqueous samples

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Science china chemistry 2010年第12期53卷 2600-2607页

作者： GUO JieHong 1,2,LI XingHong 2,CAO XueLi 1,QU Lei 2,3,HOU DeKun 2 & XU XiaoBai 2 1 School of chemical and environmental engineering,beijing Technology and Business university,beijing 100048,china 2 State Key Laboratory of environmental chemistry and eco-toxicology research center of eco-environmental sciences,chinese academy of sciences,beijing 100085,china 3 Zhengzhou university,Zhengzhou 450001,china 1. School of chemical and environmental engineering Beijing Technology and Business University Beijing 100048 China2. State Key Laboratory of Environmental Chemistry and Eco-toxicology research center of eco-environmental sciences Chinese Academy of Sciences Beijing 100085 China3. Zhengzhou University Zhengzhou 450001 China

As extraction solvents,ionic liquids have green *** this study,an environmentally benign analytical method termed temperature-controlled ionic liquid dispersive liquid phase microextraction (TIL-DLME) combined with ultra-highpressure liquid chromatography (UHPLC)-tunable ultraviolet detection (TUV) was developed for the pre-concentration and determination of triclosan (TCS),triclocarban (TCC) and methyl-triclosan (M-TCS) in water *** parameters that may affect extraction efficiencies were examined and optimized,including the types and amount of ionic liquids,volume of the diluent,heating temperature,cooling time,salt effect and pH *** the optimum conditions,linearity of the method was observed in the ranges of 0.0100-100 μgL-1 for TCS and M-TCS,and 0.00500-50.0 μgL-1 for TCC with correlation coefficients (r2) > *** limits of detection (LODs) ranged from 1.15 to 5.33 *** in domestic water and TCC in reclaimed water were detected at the concentrations of 1.01 and 0.126 μgL-1,*** spiked recoveries of the three target compounds in reclaimed water,irrigating water,waste water and domestic water samples were obtained in the ranges of 68.4%-71.9%,61.6%-87.8%,58.9%-74.9% and 64.9%-92.4%,*** with the previous dispersive liquid-liquid microextraction method (DLLME) about the determination of TCS,TCC and M-TCS,this method is not only more environmentally friendly but also more sensitive.

关键词： ionic liquid temperature-controlled ionic liquid dispersive liquid phase microextraction UHPLC aqueous samples

Virus rejection with two model human enteric viruses in membrane bioreactor system

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Science china chemistry 2007年第3期50卷 397-404页

作者： ZHENG Xiang1,2 & LIU JunXin1 1 research center for eco-environmental sciences, chinese academy of sciences, beijing 100085, china 2 School of Environment & Natural Resources, Renmin university of china, beijing 100872, china 1. research center for eco-environmental sciences Chinese Academy of Sciences Beijing 100085 China 2. School of Environment & Natural Resources Renmin University of China Beijing 100872 China

A membrane bioreactor (MBR) with gravity drain was tested for virus rejection with two coliphages, T4 and f2, which were used as surrogates for human enteric viruses. Virus rejection was investigated by PVDF and PP membrane modules, with the pore sizes of 0.22 and 0.1 μm, respectively. In tap water system, 2.1 lg rejection of coliphage T4 could be achieved by PVDF membrane compared with complete rejection by PP membrane, while for coliphage f2 with smaller diameter, 0.3―0.5 lg rejection of the influent virus was removed by the two membranes. In domestic wastewater system, cake layer and gel layer on the membrane surface changed the cut-off size of the membrane so that there was no significant difference between PP and PVDF for each coliphage. The removal ratios of coliphage T4 and f2 in the MBR were more than 5.5 and 3.0 lg, respectively. Compared with 5.5 lg removal for virus T4 in the MBR system, only 2.1 lg (96.8%―99.9%) removal rate was observed in the conventional activated sludge system with the influent virus concentration fluctuating from 1830 to 57000 PFU/mL. Only 0.8%―22% virus removal was the effect of adsorption to activated sludge, which showed a decreasing tendency with the retention time, while 75%―98% was the effect of virus inactivation by microbial activity. It indicated that the major mechanism of virus removal was not the transfer of viruses from the water phase to the sludge phase but inactivation in the biological treatment process.

关键词： MBR model virus enteric virus inactivation

Preparation and characterization of a novel adsorbent for removing lipophilic organic from water

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Science china chemistry 2005年第6期48卷 600-604页

作者： LIU Huijuan1, DAI Ruihua1, QU Jiuhui1 & RU Jia1,2 1. State Key Laboratory of environmental Aquatic chemistry, research center for eco-environmental sciences, chinese academy of sciences, beijing 100085, china 2. graduate School of the chinese academy of sciences, beijing 100039, china 1. State Key Laboratory of environmental Aquatic chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences 100085 Beijing China 2. graduate School of the chinese academy of sciences 100039 Beijing China

A novel composite adsorbent containing a kind of lipid-triolein is studied. The ad-sorbent is prepared by embedding triolein into cellulose acetate (CA) sphere. The preparation method, the physical-chemical properties of the adsorbent and the removal efficiency of two or-ganochlorinated pesticides are studied. The adsorbent is stable in water and no triolein leaks into water for 465 h soaking. The adsorbent has high adsorption capacity for organochlorinated pes-ticides such as dieldrin and aldrin. The results suggest that triolein-containing adsorbent could serve as a good adsorbent for lipophilic organic pollutants. The adsorption rate for lipophilic pol-lutants is very fast and has relation with the logKow of the compounds.

关键词： triolein, cellulose acetate, adsorbent, lipophilic organic, drinking water.

ECSTM study of adsorption of C_(60),C_(70),C_(86) and Y@C_(82) on Au(111)

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Science china chemistry 2010年第8期53卷 1705-1710页

作者： SU GuiJin1,JIA ManKe1,GAN LiHua2 & SHI RuiFang1 1State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences,chinese academy of sciences,beijing 100085,china 2School of chemistry and chemical engineering,Southwest university,Chongqing 400715,china 1. State Key Laboratory of environmental chemistry and ecotoxicology research center for eco-environmental sciences Chinese Academy of Sciences Beijing 100085 China2. School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 China

The adsorption of a variety of fullerenes (C60,C70,C86,Y@C82) on Au(111) electrode surfaces was comprehensively investigated in 0.1 M HClO4 by electrochemical scanning tunneling microscopy (ECSTM).In the ordered C60's adlayer,C60 molecules formed either (2(1/3) × 2 3～(1/3))or "in-phase" *** high resolution STM image shows that the C60 cage is not simply round but shows a bifurcated *** adsorption orientation of C60 on Au(111) is tentatively *** the ordered C70's adlayer,the perpendicular fullerene molecules are the main adsorption mode and form (2 3～(1/3) × 2 3～(1/3)) ***,for C86 and Y@C82,the ordered adlayer could not be obtained on Au(111) under the present *** differences may be due to the different molecular shapes and sizes,and the encapsulated metal atom which affects the lattice matches with the *** adsorption of fullerene molecules on Au(111) from disorder to order could be tuned simply by steering the dimensional sizes or shapes of the fullerenes used.

关键词： C60 C70 C86 Y@C82 ECSTM Au(111)

AFM study on the adsorption and aggregation behavior of dissolved humic substances on mica

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Science china chemistry 2006年第3期49卷 256-266页

作者： GE Xiaopeng1, ZHOU Yanmei2, Lü Chunhua1 & TANG Hongxiao1 1. State Key Laboratory of environmental Aquatic chemistry, research center for eco-environmental sciences, chinese academy of sciences, beijing 100085, china 2. School of Civil engineering & Architecture, beijing Jiaotong university, beijing 100044, china 1. State Key Laboratory of environmental Aquatic chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China 2. School of Civil engineering & Architecture Beijing Jiaotong University Beijing 100044 China

Humic substances constitute the major organic fractions of soils, sediments and natural waters, and play a dominant role in the binding, mobilization, transport and ultimate fate of organic contaminants in subsurface systems. In this paper, two humic acid samples, Guanting and Tianjin, with different origin and chemical compositions have been investigated with AFM imaging for their adsorption and aggregation behaviors on mica. While the Tianjin humic sample is found to form small spheres with 250 to 330 nm in diameter at lower concentrations, irregular loop-chain assemblies of hundreds of nanometer in diameter with the chain width of about 40 nm are dominant for the Guanting humic sample, which may attribute to the more polar aliphatic fractions in the chemical composition in the latter. The heterogeneous and polydisperse nature of humic substances with multiple structural features, such as sponge-like structures, perforated sheets, aggregate of spheres, branches and chain-like assemblies etc., is apparent at higher concentrations for both humic samples, showing morphologically new evidence for the dominant view of the humic dual-mode sorption model. With naphthalene introduced, the assemblies of Guanting humic substances clearly become more compact with significantly narrowed branches and less porous the perforated sheet-like structures. It is indica- tive of that smaller nanometer scale rings present along the perforated assemblies could potentially represent hydrophobic domains, which may facilitate the adsorption and aggregation of naphthalene onto the natural particle surfaces and therefore lead to an important role of dissolved humic sub- stances in the sorption of environmental pollutants.

关键词： atomic force microscopy (AFM) dissolved humic substances morphology aggregation adsorption