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Adsorption of arsenic(V) by new aluminum compounds loaded fibrous adsorbent from water

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Adsorption of arsenic(V) by new aluminum compounds loaded fi...

STUDY ON ADSORPTION OF HUMIC AND PHYIC ACIDS USING RESINS

热烈庆祝中国化学会成立80周年——中国化学会第16届反应性高分子学术研讨会

作者： Ying Meng~1,Jinnan Wang~(1,2*),Chen Chen~1,Xin Yang~1 1.state key laboratory of pollution control and Resource reuse & school of the environment, 2.nanjing university,nanjing 210046,china

1 Introduction Arsenic is a toxic and carcinogenic element which occurs naturally in soils,rocks and *** of arsenic-contaminated drinking water can cause long-term health ***,arsenic contamination of water/groundwater...

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Chinese Journal of Reactive Polymers 2008年第Z1期 90-95页

作者： WANG Jinnan1,2 LI Aimin1,2 ZHOU Youdong1,2 YANG Zhou1,2 LI Xu1,2 1. state key laboratory of pollution control and Resource reuse, nanjing 2.0093, china 2. school of the environment, nanjing university, nanjing 2.0093, china

1. INTRODUCTION Humic acid (HA) and Phytic acid (PA) are present in environment as a result of the decomposition of plant biomass, they are the major components of natural dissolved organic

关键词： XAD high than STUDY ON ADSORPTION OF HUMIC AND PHYIC ACIDS USING RESINS TA Pb GA

Heterogeneous reaction of formaldehyde on the surface of TiO_2 particles

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Science china Chemistry 2010年第12期53卷 2644-2651页

作者： XU BingYe 1,2,ZHU Tong 1,TANG XiaoYan 1 & SHANG Jing 1 1 state key Joint laboratory of environmental Simulation and pollution control College of environmental Sciences and Engineering,Peking university,Beijing 100871,china 2 Zhejiang Province environmental Monitoring Center,Hangzhou 310012,china 1. state key Joint laboratory of environmental Simulation and pollution control College of environmental Sciences and Engineering Peking University Beijing 100871 China2. Zhejiang Province Environmental Monitoring Center Hangzhou 310012 China

The heterogeneous reaction of formaldehyde (HCHO) on the surface of titanium dioxide (TiO2) was investigated in situ using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with ion chromatography (IC),X-ray diffraction (XRD),and transmission electron microscopy (TEM).Formate,dioxymethylene,methoxy,and polyoxymethylene were observed in the infrared spectra of TiO2 particles during the *** the surface of TiO2,the adsorbed HCHO was first oxidized to dioxymethylene and further oxidized to *** effects of temperature and ultraviolet radiation (UV) on the reaction products and reactive uptake coefficients were studied,and the results indicate that the reaction rate can be accelerated at increasing temperatures as well as under *** heterogeneous reaction mechanisms of HCHO on the surface of TiO2 in the dark and under UV irradiation are *** measurements show that formate formation on TiO2 is second order in HCHO concentration and the initial reactive uptake coefficients at room temperature calculated with the Brunauer-EmmettTeller specific surface area are (0.5-5) × 10-8 ([HCHO]:1 × 1013-2 × 10 14 molecules/cm3).A linear function relationship exists between the uptake coefficient and the *** apparent activation energy of the reaction was also determined.

关键词： DRIFTS formaldehyde heterogeneous reaction reactive uptake coefficient TiO2

Soil Fertility Indices of Citrus Orchard Land Along Topographic Gradients in the Three Gorges Area of china

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Pedosphere 2011年第6期21卷 782-792页

作者： WU Dian-Ming YU Yuan-Chun XIA Li-Zhong YIN Shi-Xue YANG Lin-Zhang College of Forest resources and environment Nanjing Forestry University Nanjing 210037 （China） state key laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） College of environmental Science and Engineering Yangzhou University Yangzhou 22500g （China）

In the Three Gorges Area of china, soil erosion and the resultant non-point source pollution and ecological degradation have endangered agricultural ecosystems and fresh water reservoirs. Although efforts have been undertaken to reduce soil and water losses from slope land used for citrus production, information on the effects of management practices on soil fertility indices is either limited or nonexistent. This study was conducted to compare the effects of 10 years of various management practices, citrus intercropped with white clover (WC), citrus mulched with straw (SM), citrus intercropped with contour hedgerows (CH), citrus orchard land with impermeable membrane (IM), and citrus intercropped with wheat (Triticum aestivum) and peanut (Arachris hypogaea) (WP), as treatments on soil fertility indices with that of the conventional citrus management (CM). Results showed that the soil organic carbon, total and available nitrogen, available potassium, and water-stable aggregate (> 0.25 mm) contents at the 0–5 cm depth were higher for the WC and SM treatments than the CM treatment. There was also spatial variation in soil fertility along slopes of the WC and SM treatments. The soil total and available nitrogen, phosphorus, and potassium, and water-stable aggregate (> 0.25 mm) contents at both the 0–5 and 5–20 cm depths were higher for the CH and IM treatments than the CM treatment. The average soil available nitrogen and available potassium contents were higher for the WP treatment than the CM treatment, but the WP treatment had little effect on the soil organic carbon, total nitrogen, and water-stable aggregate (> 0.25 mm) contents. These suggested that white clover intercropping and straw mulching were the most effective approaches to improve soil fertility in citrus orchard land of the Three Gorges area.

关键词： intercropping slope land soil nutrients soil water-stable aggregates straw mulching

Toward Water Conservation Society:the Connotationand Assessment Indication System

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Chinese Journal of Population,resources and environment 2004年第2期2卷 45-48页

作者： Chen Ying,Zhao Yong & Liu Changmingschool of environment,Beijing Normal university,state key Joint laboratory of environment Simulation and pollution control,Beijing,100875,100875,chinachina Institute of Water resources and Hydraulic Research,Beijing,100044,china school of environment Beijing Normal University State Key joint Laboratory of Environment Simulation and Pollution Control United States china Institute of Water resources and Hydraulic Research United States

Water saving and developing water conservation society are the two key strategies both for wise water allocation and sustainable utilization. The paper analyses the connotation of water saving and water conservation society. Essentially, water saving means freeing up water from non-beneficial uses and providing it to some more productive uses. Basic principles for setting indicator are presented by providing efficient use of water, considering social issues and ecological protection. An integrated assessing water saving system aiming at more sustainable and efficient consumption is given considering unbalanced social and economic development in regions and basins. The hierarchy indicator system provides qualified tools to the practice of water conservation and evaluates the value for water conservation society construction.

关键词： water conservation water use efficiency hierarchy assessment indicator.

The roles of heterogeneous chemical processes in the formation of an air pollution complex and gray haze

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Science china Chemistry 2011年第1期54卷 145-153页

作者： ZHU Tong,SHANG Jing & ZHAO DeFeng state key Joint laboratory of environmental Simulation and pollution control College of environmental Sciences and Engineering,Peking university,Beijing 100871,china 1. state key Joint laboratory of environmental Simulation and pollution control College of environmental Sciences and Engineering Peking University Beijing 100871 China

Urban and regional air pollutions are characterized by high concentrations of secondary pollutants such as photo-oxidants （mainly ozone） and fine particulate matter, which are formed through chemical reactions of the primary pollutants emitted from various sources. The accumulation of these pollutants under stagnant meteorological conditions results in the formation of gray haze, reducing visibility and causing major impacts on human health and climate. In an air pollution complex, the co- existence of high concentrations of primary and secondary gaseous and particulate pollutants provides a large amount of reac- tants for heterogeneous reactions on the surface of fine particles; these reactions change the oxidizing capacity of the atmos- phere, as well as chemical compositions along with the physicochemical and optical properties of particulate matter, thereby accelerating formation of the air pollution complex and gray haze. Using in situ technologies, such as diffuse reflectance infra- red Fourier-transform spectroscopy and single-particle Raman spectroscopy, we systematically investigated the reaction kinet- ics and mechanisms of gaseous pollutants （i.e., NO2, SO2, 03, and formaldehyde） on the surfaces of the major components of atmospheric particles such as CaCO3, kaolinite, montmorillonite, NaC1, sea salt, A1203, and Tit2. We found that the main re- action products were sulfate, nitrate, or formate, which can change the hygroscopicity and light extinction parameters of those particles significantly. By analyzing the reaction kinetics of these heterogeneous reactions, we identified synergetic mechanisms of the three ternary reaction systems, ,i.e., NOE-particles-H2O, SO2-particles-O3, and organics/SO2-particles-UV illumination. These synergetic mechanisms can provide experimental and theoretical bases for understanding the feedback mechanisms and nonlinear processes in the formation of an air pollution complex and gray haze.

关键词： fine particles secondary pollutants oxidizing capacity ternary reaction nonlinear processes

Heterogeneous reactions of SO_2 on ZnO particle surfaces

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Science china Chemistry 2011年第1期54卷 161-166页

作者： LI Jia,SHANG Jing & ZHU Tong state key Joint laboratory of environmental Simulation and pollution control College of environmental Sciences and Engineering,Peking university,Beijing 100871,china 1. state key Joint laboratory of environmental Simulation and pollution control College of environmental Sciences and Engineering Peking University Beijing 100871 China

Heterogeneous reactions of SO2 on ZnO particle surfaces were studied using in situ diffuse reflectance infrared Fourier transform spectroscopy （DRIFTS）. The influences of relative humidity （RH） and UV radiation （2= 365 nm） were investigated. In the absence of UV radiation, sulfite was the prominent product on the particle surfaces, and a negative relationship between RH and sulfite production was observed. In the presence of UV radiation, infrared （IR） absorption of sulfite and sulfate was evident in the spectra. With increasing RH or UV intensity, sulfite was gradually transformed into sulfate. UV intensity and RH exhibited a synergistic effect on the heterogeneous oxidation of SO2 on ZnO. On dry particles and with no UV radiation, the reaction order of SO2 on ZnO particles was 1.6. The initial uptake coefficient for the formation of sulfite, using the Brunauer-Emmett-Teller （BET） area as the reactive surface area of SO2, was 4.87 × 10^-6. At 40% RH and with UV radiation, the reaction order was 0.91, and the initial uptake coefficient was 2.29 ×10^-5.

关键词： SO2 ZnO DRIFTS heterogeneous oxidation UV radiation

Dynamic Study of Material Productivity of Jiangsu Province

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Dynamic Study of Material Productivity of Jiangsu Province

Mechanism for calcite dissolution and its contribution to development of reservoir porosity and permeability in the Kela 2 gas field,Tarim Basin,china

2007中国科协年会

作者： Huang Heping~(1,2) Bi Jun~(1,*) 1.state key Lab of pollution control & Resource reuse,school of the environment,nanjing university,nanjing,china,2.0093 2.school of Resource & environment Management,Jiangxi university of Finance & Economics,Nanchang,china,330032

Resource scarce and excessive consumption have become tire obstacle to national or regional sustainable *** china’s government put forward the stratagem of circular economy and engages into reconstruct a society of environmentally sound and less resource *** paper rakes the eco-environmental system in Jiangsu province for an example;combined the results of MFA(material flow analysis)and local economic information,the material or resource productivity which is an expressive form of eco-efficiency were calculated and *** results showed that the series of eco-efficiency in the study area has been increasing in different degrees.

关键词： environmental Science Material Productivity Eco-Efficiency Jiangsu Province

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Science china Earth Sciences 2008年第4期51卷 567-578页

作者： YU BingSong1,3, DONG HailLiang2,3 & RUAN Zhuang1,3 1 state key laboratory of Geological Processes and Mineral resources, china university of Geosciences, Beijing 100083, china 2 Department of Geology, Miami university,Oxford, OH 45056, USA 3 Geomicrobiology laboratory, china university of Geosciences, Beijing, 100083, china state key laboratory of Geological Processes and Mineral resources China University of Geosciences Beijing 100083 China Department of Geology Miami University Oxford OH 45056 USA Geomicrobiology laboratory China University of Geoscien

This study is undertaken to understand how calcite precipitation and dissolution contributes to depth-related changes in porosity and permeability of gas-bearing sandstone reservoirs in the Kela 2 gas field of the Tarim Basin, Northwestern china. Sandstone samples and pore water samples are col-lected from well KL201 in the Tarim Basin. Vertical profiles of porosity, permeability, pore water chem-istry, and the relative volume abundance of calcite/dolomite are constructed from 3600 to 4000 m below the ground surface within major oil and gas reservoir rocks. Porosity and permeability values are in-versely correlated with the calcite abundance, indicating that calcite dissolution and precipitation may be controlling porosity and permeability of the reservoir rocks. Pore water chemistry exhibits a sys-tematic variation from the Na2SO4 type at the shallow depth (3600-3630 m), to the NaHCO3 type at the intermediate depth (3630―3695 m),and to the CaCl2 type at the greater depth (3728―3938 m). The geochemical factors that control the calcite solubility include pH, temperature, pressure, Ca2+ concen-tration, the total inorganic carbon concentration (ΣCO2), and the type of pore water. Thermodynamic phase equilibrium and mass conservation laws are applied to calculate the calcite saturation state as a function of a few key parameters. The model calculation illustrates that the calcite solubility is strongly dependent on the chemical composition of pore water, mainly the concentration difference between the total dissolved inorganic carbon and dissolved calcium concentration (i.e., [ΣCO2] -[Ca2+]). In the Na2SO4 water at the shallow depth, this index is close to 0, pore water is near the calcite solubility. Calcite does not dissolve or precipitate in significant quantities. In the NaHCO3 water at the intermedi-ate depth, this index is greater than 0, and pore water is supersaturated with respect to calcite. Massive calcite precipitation was observed at this depth interval and

关键词： calcite dissolution porosity thermodynamic Tarim Basin