The compound nano-ZnO modified with Ce was prepared by homogeneous precipitation.IR,XRD and dynamic experiments show that the crystal size of nano-ZnO desulfurizer is decreased after being modified with Ce and its des...The compound nano-ZnO modified with Ce was prepared by homogeneous precipitation.IR,XRD and dynamic experiments show that the crystal size of nano-ZnO desulfurizer is decreased after being modified with Ce and its desulfurization activities are improved greatly.When calcined at 270 ℃,Ce distributes evenly on the ZnO particle surface as amorphous state oxides,and the amorphous ZnO·H2O also exists;when the calcining temperature is 570 ℃,the crystal CeO2 separates out and the amorphous structure of zinc oxide disappears,at the same time,the crystal is perfect and its size increases,but the desulfurization activities decrease.The desulfurization product of nano-ZnO modified with Ce was analyzed with XPS.The results show that the adsorption compound of HS,S and ZnS exists on the surface of the desulfurizer.展开更多
The valley shaped Tianziling landfill of Hangzhou in China built in 1991 to dispose of municipal solid waste (MSW) was designed for a service life of 13 years. The problem of waste landfill slope stability and expansi...The valley shaped Tianziling landfill of Hangzhou in China built in 1991 to dispose of municipal solid waste (MSW) was designed for a service life of 13 years. The problem of waste landfill slope stability and expansion must be considered from the geotechnical engineering point of view, for which purpose, it is necessary to understand the geotechnical properties of the MSW in the landfill, some of whose physical properties were measured by common geotechnical tests, such as those on unit weight, water content, organic matter content, specific gravity, coefficient of permeability, compressibility, etc. The mechanical properties were studied by direct shear test, triaxial compression test, and static and dynamic penetration tests. Some strength parameters for engineering analysis were obtained.展开更多
基金the National Natural Science Foundation of China(Grant No.50478026)the Science Foundation for Young Scientists of Harbin University of Science and Technology(Grant No.2008XQJZ039)
文摘The compound nano-ZnO modified with Ce was prepared by homogeneous precipitation.IR,XRD and dynamic experiments show that the crystal size of nano-ZnO desulfurizer is decreased after being modified with Ce and its desulfurization activities are improved greatly.When calcined at 270 ℃,Ce distributes evenly on the ZnO particle surface as amorphous state oxides,and the amorphous ZnO·H2O also exists;when the calcining temperature is 570 ℃,the crystal CeO2 separates out and the amorphous structure of zinc oxide disappears,at the same time,the crystal is perfect and its size increases,but the desulfurization activities decrease.The desulfurization product of nano-ZnO modified with Ce was analyzed with XPS.The results show that the adsorption compound of HS,S and ZnS exists on the surface of the desulfurizer.
文摘The valley shaped Tianziling landfill of Hangzhou in China built in 1991 to dispose of municipal solid waste (MSW) was designed for a service life of 13 years. The problem of waste landfill slope stability and expansion must be considered from the geotechnical engineering point of view, for which purpose, it is necessary to understand the geotechnical properties of the MSW in the landfill, some of whose physical properties were measured by common geotechnical tests, such as those on unit weight, water content, organic matter content, specific gravity, coefficient of permeability, compressibility, etc. The mechanical properties were studied by direct shear test, triaxial compression test, and static and dynamic penetration tests. Some strength parameters for engineering analysis were obtained.
