检索结果-内蒙古大学图书馆

International Conference on Bioinformatics and Biomedical Engineering (ICBBE)

作者： Chunhua Xu Dandan Cheng Qinyan Yue Zhilei Yin Baoyu Gao Xian Zhao State Key Laboratory of Crystal Materials Shandong University Jinan China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Jinan China School of Chemistry and Chemical Engineering Shandong University Jinan China

In resent years, various types of iron-based materials have been used as sorbents to remove heavy metals from wastewater. It is reported that the adsorption capacities of heavy metals on different kinds of iron oxides are quite high. However, researchers have not done much work on the Cr (VI) adsorption onto β-FeOOH. This study aims to investigate the removal of Cr (VI) with β-FeOOH, including the effect of pH and time on the adsorption process, and the Cr (VI) adsorption thermodynamic. The X-ray diffraction (XRD) pattern verified that the synthesized particle was β-FeOOH. Transmission electron microscopy (TEM) image revealed that it was nano-scaled. Experimental results indicated that the reaction rate between the adsorbent and adsorbate was quite high, and the adsorption equilibrium was gained within one hour. The adsorption of Cr (VI) on β-FeOOH was favorable in acidulous water, and the highest removal efficiency was obtained at pH 5. The Langmuir isotherm was suitable for describing the adsorption process, and the adsorption capacity increases with the increasing temperature. The examination of thermodynamic parameters showed that the adsorption process of Cr (VI) onto β-FeOOH nanoparticles was endothermic and spontaneous at the temperature studied. The adsorption experimental results indicated that removal of Cr (VI) from water with β-FeOOH nanoparticles was viable. The adsorption capacities were 15.45 mg/g, 16.87 mg/g and 18.48 mg/g at 293 K, 303 K and 313 K, respectively.

关键词： Chromium Thermodynamics Temperature Nanoparticles Inorganic materials Waste materials Wastewater Iron X-ray imaging X-ray diffraction

来源：评论

学校读者我要写书评

暂无评论

Notice of Retraction: The role of free bromine during bromate formation in UV photolysis

Notice of Retraction: The role of free bromine during bromat...

引用

International Conference on Environmental Science and Information Application Technology, ESIAT

作者： Xin Huang Nai-yun Gao Ning Lu School of Environment and Chemical Engineering Shanghai University Shanghai China State Key Laboratory of Pollution Control and Resource Reuse University of Tongji Shanghai China School of Environment and Chemical Engineering Shanghai University Shanghai Shanghai China

This article has been retracted by the publisher.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Phytotoxicity of four herbicides on Ceratophyllum demersum,Vallisneria natans and Elodea nuttallii

引用

Journal of Environmental Sciences 2009年第3期21卷 307-312页

作者： PAN Huiyun,LI Xiaolu,XU Xiaohua,GAO Shixiang state key laboratory of pollution control and resource reuse,School of the Environment,Nanjing University,Nanjing 210093,China. [a]State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

The physiological effects of 4 herbicides （butachlor, quinclorac, bensulfuron-methyl and atrazine） on 3 submerged macrophytes （Ceratophyllum demersum, Vallisneria natans and Elodea nuttallii） were tested in laboratory. The variables of the relative growth rate and the photosynthetic pigment content showed that all of the tested herbicides affected the growth of the plants obviously, even at the lowest concentration （0.0001 mg/L）. Except for the C. demersum treated with quinclorac at 0.005 and 0.01 mg/L, the relative growth rates of the plants were inhibited significantly （p 〈 0.01）. Statistical analysis of chlorophyll a （Chl-a） contents was carded out with both the t-test and one-way ANOVA to determine the difference between the treatment and control. The results showed that Chl-a contents of the plants in all treatment groups were affected by herbicides significantly, except for the C. demersum treated with bensulfuron-methyl at 0.0005 mg/L. The decrease in Chl-a content was positively correlated to the dosage of the herbicides in most treatment groups. It was suggested that herbicides in water bodies might potentially affect the growth of aquatic macrophytes. Since the Chl-a content of submerged macrophytes responded to the stress of herbicides sensitively and directly, it could be used as a biomaker in environmental monitoring or in the ecological risk assessment of herbicide contamination.

关键词： phytotoxicity herbicides submerged macrophyte ecological risk assessment

来源：评论

学校读者我要写书评

暂无评论

A novel aminated polymeric adsorbent for removing refractory dissolved organic matter from landfill leachate treatment plant

引用

Journal of Environmental Sciences 2009年第8期21卷 1089-1095页

作者： ZHANG Long, LI Aimin, WANG Jinnan, LU Yufei, ZHOU Youdong state key laboratory of pollution control and resource reuse, School of the Environment, Nanjing University, Nanjing 210093, China. [a]State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

Refractory dissolved organic matter （DOM） from landfill leachate treatment plant was with high dissolved organic carbon （DOC） content. An aminated polymeric adsorbent NDA-8 with tertiary amino groups and sufficient mesopore was synthesized, which exhibited high adsorption capacity to the DOM （raw water after coagulation）. Resin NDA-8 performed better in the uptake of the DOM than resin DAX-8 and A100. Electrostatic attraction was considered as the decisive interaction between the adsorbent and adsorbate. Special attention was paid to the correlation between porous structure and adsorption capacity. The mesopore of NDA-8 played a crucial role during uptake of the DOM. In general, resin in chloride form performed a higher removal rate of DOC. According to the colunm adsorption test, total adsorption capacity of NDA-8 was calculated to 52.28 mg DOC/mL wet resin. 0.2 mol/L sodium hydroxide solution could regenerate the adsorbent efficiently.

关键词： electrostatic interactions chemically modified resin coagulation adsorption pore structure

来源：评论

学校读者我要写书评

暂无评论

Preparation and characterization of organic-inorganic hybrid membranes based on composite nanoparticles

引用

Gongneng Cailiao/Journal of Functional Materials 2010年第4期41卷 737-740页

作者： Zhao, Qing Yu, Shui-Li Lv, Hui State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China

Polyvinylidene fluoride (PVDF) membrane modified by Al2O3/TiO2 composite nanoparticles was prepared via blending method for the improvements of hydrophilicity and antifouling performance. Pure water flux, rejection ratio and contact angle of membrane surface were measured to investigate the permeation, the separability and the hydrophilicity of the hybrid membrane. Detailed observation over membrane surface and cross-section were observed by scanning electronic microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were employed to invest the chemical structure and the crystallization degree of the membrane, respectively. The membrane antifouling performance analysis was also carried out. The results indicated that modification improved the flux, hydrophilicity and antifouling ability of the PVDF membrane.

关键词： Blending

来源：评论

学校读者我要写书评

暂无评论

Microwave photocatalytic degradation of Rhodamine B using TiO_2 supported on activated carbon:Mechanism implication

引用

Journal of Environmental Sciences 2009年第2期21卷 268-272页

作者： HE Zhong,YANG Shaogui,JU Yongming,SUN Cheng state key laboratory of pollution control and resource reuse,School of the Environment,Nanjing University,Nanjing 210093,China. State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

The photocatalytic degradation of Rhodamine B （RhB） was carried out using TiO2 supported on activated carbon （TiO2-AC） under microwave irradiation. Composite catalyst TiO2-AC was prepared and characterized using X-ray diffraction （XRD）, transmission electron microscopy （TEM） and Brunauer-Emmett-Teller （BET）. In the process of microwave-enhanced photocatalysis （MPC）, RhB （30 mg/L） was almost completely decoloured in 10 min, and the mineralization efficiency was 96.0% in 20 min. The reaction rate constant of RhB in MPC using TiO2-AC by pseudo first-order reaction kinetics was 4.16 times of that using Degussa P25. Additionally, according to gas chromatography/mass spectrometry （GC/MS） and liquid chromatography/mass spectrometry （LC/MS） identification, the major intermediates of RhB in MPC included two kinds of N-de-ethylation intermediates （N,N-diethyl-N＇-ethyl-rhodamine （DER））, oxalic acid, malonic acid, snccinic acid, and phthalic acid, maleic acid, 3-nitrobenzoic acid, and so on. The degradation of RhB in MPC was mainly attributed to the destruction of the conjugated structure, and then the intermediates transformed to acid molecules which were mineralized to water and carbon dioxide.

关键词： microwave photocatalytic WiO2, activated carbon Rhodamine B degradation mechanism

来源：评论

学校读者我要写书评

暂无评论

QSAR study on the non-monotonic dose-response curve of PCBs in chicken embryo hepatocyte bioassay

引用

Science China Chemistry 2009年第5期52卷 662-669页

作者： YunSong Mu AiQian Zhang ChangAn Gao SuFen Peng LianSheng Wang State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing 210093 China

Endocrine disrupting chemicals (EDCs) in the natural environment exhibit a unique non-monotonic dose-response curve and it is impossible to select one simple index to characterize the bilogogical activity of these compounds. Quantitative structure-activity relationship (QSAR) study on non-monotonic dose-response curve has become a real challenge presently. In order to explore the possible mechanism for the non-monotonic dose-response curve of polychlorinated biphenyls congeners (PCBs) in chicken embryo hepatocyte bioassay, AM1 method of ChemOffice was adopted to calculate necessary structure descriptors for PCBs, while the interactions between PCBs and simulated AhR ligand binding domain (LBD) were analyzed by using FlexX in SYBYL7.0. Different binding modes for PCBs have been distinguished not only from aligned conformation but also from free binding energy. Some QSAR models were established separately for both low and high doses ranges, revealing that receptor binding may predominate in the interference of the physiological function of cytochrome P4501A-P4501A in the low doses range. But with the higher doses range, the EROD suppression might be related to acute toxicity owing to molecular polarity or distribution of charges and consequently damage structure and function of chicken embryo hepatocyte.

关键词： polychlorinated biphenyls congeners (PCBs) non-monotonic dose-response curve quantitative structure-activity relationship (QSAR)

来源：评论

学校读者我要写书评

暂无评论

Critical review in adsorption kinetic models

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 716-724页

作者： Hui QIU Lu LV Bing-cai PAN Qing-jian ZHANG Wei-ming ZHANG Quan-xing ZHANG State Key Laboratory of Pollution Control and Resource Reuse Department of Environmental Engineering School of the Environment Nanjing University Nanjing 210093 China

Adsorption is one of the most widely applied techniques for environmental remediation. Its kinetics are of great significance to evaluate the performance of a given adsorbent and gain insight into the underlying mechanisms. There are lots of references available concerning adsorption kinetics, and several mathematic models have been developed to describe adsorption reaction and diffusion processes. However, these models were frequently employed to fit the kinetic data in an unsuitable or improper manner. This is mainly because the boundary conditions of the associated models were, to a considerable extent, ignored for data modeling. Here we reviewed several widely-used adsorption kinetic models and paid more attention to their boundary conditions. We believe that the review is of certain significance and improvement for adsorption kinetic modeling.

关键词： Adsorption kinetics Reaction models Diffusion models Film diffusion Intraparticle diffusion

来源：评论

学校读者我要写书评

暂无评论

Study on the influence of humic acid of different molecular weight on basic ion exchange resin's adsorption capacity

引用

Chinese Chemical Letters 2009年第12期20卷 1478-1482页

作者： Jin Nan Wang Ai Min Li Yang Zhou Li Xu State Key Laboratory of Pollution Control and Resource Reuse & School of the Environment Nanjing University Nanjing 210093 China

In this paper, humic acid （HA） was ultra-filtered into different molecular weight sections and was characterized by multielement analysis, UV254/TOC, FT-IR and three-dimensional fluorescence spectrometric. Since humic acids of different molecular weights have different hydrophilic and molecular size, the maximum adsorption capacity of basic ion exchange resins appears on the humic acid whose molecular weight ranges from 6000 to 10,000 Da.

关键词： Humic acid Molecular weight Basic ion exchange resin Adsorption

来源：评论

学校读者我要写书评

暂无评论

Quantitative structure-activity relationships of selected phenols with non-monotonic dose-response curves

引用

Chinese Science Bulletin 2009年第10期54卷 1786-1796页

作者： GAO ChangAn ZHANG AiQian LIN Yuan YIN DaQiang WANG LianSheng State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Particular non-monotonic dose-response curves of many endocrine disrupting chemicals (EDCs) suggest the existence of diverse toxicity mechanisms at different dose levels. As a result, the biological activities of EDCs cannot be simply exhibited by unique EC50/LD50 values, and the quantitative structure-activity relationship (QSAR) analysis for non-monotonic dose-response relationship becomes an unknown field in the environmental science. In this paper, nine phenols with inverted U-shaped dose-response curves in lymphocyte proliferation test of Carassius auratus were selected. The binding interactions between the phenols and several typical EDCs-related receptors were then explored in a molecular simulation study. The estrogen receptor (ER), androgen receptor (AR), thyroid hormone receptor (TR), bacterial O2 sensing FixL protein (FixL), aryl hydrocarbon receptor (AhR), and the peroxisome proliferator-activated receptor (PPAR) were the target receptors in the study. Linear regression QSAR models for the low and high exposure levels of the compounds were developed separately. The results indicated that the lymphocyte proliferation in the low-dose range might involve ER–mediated process, while the proliferation inhibition in the high dose range was dominated by the acute toxicity of phenols due to receptor occupancy and cell damage.

关键词：定量构效关系剂量反应酚类物质过氧化物酶体增殖物激活受体非单调曲线雌激素受体甲状腺激素受体

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：