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Lead adsorption capacities of different components in natural surface coatings

Journal of Environmental Sciences 2004年第1期16卷 79-85页

作者： DONGDe-ming HUAXiu-yi LIYu JILiang ZHANGJing-jing CollegeofEnvironmentandResources JilinUniversityChangchun130023China

Pb adsorption capacities of Fe oxide, Mn oxide and organic materials in natural surface coatings(biofilms and associated minerals) collected in three lakes, two ponds and a river in Jilin Province, China and Cayuga Lake in US were studied. A novel extraction technique was employed to remove one or more component(s) from the surface coatings. Pb adsorption to surface coatings before and after extraction was performed to determine the adsorptive properties of the extracted component(s). The statistical analysis of observed Pb adsorption was carried out using nonlinear least squares fitting(NLSF) to estimate the Pb adsorption capacity of each component of surface coatings. For each body of water, the estimated Pb adsorption capacity of Mn oxide(mol Pb/mol Mn) was significantly higher than that of Fe oxide(mol Pb/ mol Fe). The value of estimated adsorption capacities of organic materials with the unit mol Pb per kg COD was similar to or less than that of Fe oxides with the unit mol Pb per mol Fe. Comparison of components of surface coatings in different waters showed that the estimated Pb adsorption capacities of components in surface coatings developed in different natural waters were different, especially for Mn oxides.

关键词： surface coatings iron oxide manganese oxide organic material

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Comparison of Pb,Cd Adsorption to surface coatings Developed in Natural Waters with that in Plant Effluents

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Chemical Research in Chinese Universities 2003年第4期19卷 417-421页

作者： DONG De-ming LI Yu HUA Xiu-yi ZHANG Jing-jing College of Environment and Resources Jilin UniversityChangchun 130023P.R.China

The comparative studies of Pb and Cd adsorption to the surface coatings(Fe, Mn, Al oxides, organic materials, and associated minerals), which were developed on glass slides in five natural and two technical waters(plant effluents), were carried out under controlled laboratory conditions(mineral salts solution with defined speciation, ionic strength 0 05 mol/L, 25 ℃ and pH 6 0). The classical Langmuir adsorption isotherm was applied to estimating the equilibrium coefficients of Pb and Cd adsorption to the surface coatings. The results show that the maximum adsorption of Pb and Cd to the surface coatings mentioned above varied widely. There was a systemic increase in the maximum adsorption of Pb and Cd to the surface coatings with increasing the contents of Mn and Fe oxides in the surface coatings in significant correlation, respectively, not only highlighting the relative importance of the metal oxide fraction for Pb and Cd adsorption to the surface coatings developed in natural and technical water samples, but also implying the same adsorption mechanisms of Pb and Cd to the surface coatings developed both in natural and technical water samples.

关键词： Natural waters Plant effluents surface coatings Pb Cd

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Comparison of Pb and Cd adsorption to the surface coatings and surficial sediments collected in Xianghai Wetland

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Journal of Environmental Sciences 2005年第1期17卷 126-129页

作者： LIYu WANGXiao-li WANGYue DONGDe-ming ZHANGHua-peng LIQing-shan LIXingchun CollegeofEnvironmentandResources JilinUniversityChangchun130023China Song-LiaoRiverBasinWaterResourcesProtectionBureau Changchun130021China CollegeofEnvironmentandResources JilinUniversityChangchun130023China／／Song-LiaoRiverBasinWaterResourcesProtectionBureauChangchun130021China

surface coatings and surficial sediments were obtained in four natural waters in Xianghai Wetland in China to study the role of surface coatings and surficial sediments in controlling the transporting and cycling of heavy metals in aquatic environments. Pb and Cd adsorption to the surface coatings and surficial sediments were measured under controlled laboratory conditions(mineral salts solution with defined speciation, ionic strength 0 05 mol/L, 25℃ and pH 6 0 for surface coatings; and 0 005 mol/L CaCl 2 solution, 25℃ and pH 6 0 for surficial sediments). The Langmuir adsorption isotherm was applied to estimate equilibrium coefficients of Pb and Cd adsorption to the surface coatings and surficial sediments, and the component analyses of surface coatings and surficial sediments were also carried out. Correlation analyses between the maximum adsorption of Pb and Cd(Г max ) and the components in the surface coatings and surficial sediments suggested that there was a statistically significant trend for Pb and Cd adsorption(Г max ) to the surface coatings to increase with increasing in contents of Fe and Mn oxides in the surface coatings and surficial sediments. And the metal adsorption abilities of surface coatings were much stronger than those of surficial sediments, highlighting that in the same water, i.e. at the same pH and initial metal concentrations, the metals(such as lead and cadmium) in supernatant were feasible to be adsorbed by surface coatings than surficial sediments. The more importance of surface coatings than surficial sediments for adsorbing and cycling of heavy metals in aquatic environments was evidenced.

关键词： surface coatings surficial sediments Pb Cd adsorption capabilities

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Numerical Modelling and Simulation of an Internal Combustion Engine Piston with a surface Coating

Numerical Modelling and Simulation of an Internal Combustion...

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The 10th EPMESC

作者： Tadeusz Niezgoda Zdzislaw Kurowski Jerzy Malachowski Faculty of Mechanical Engineering Military University of Technology 00-908 Warsaw Poland Faculty of Mechanical Engineering Military University of Technology 00-908 Warsaw Poland Faculty of Mechanical Engineering Military University of Technology 00-908 Warsaw Poland

The paper presents numerical Finite Element modelling and simulation of an internal combustion engine piston with a zirconia coating, subjected to thermal and thermo-mechanical loadings. Methodology o

关键词： surface coatings thermal barriers graded materials internal combustion engines.

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