排序方式: 共有13条查询结果,搜索用时 15 毫秒
1.
制备了交联海藻酸,从静态吸附方面研究了海藻酸交联前后对Cu~(2+)的吸附性能。用三种动力学模型(准一级动力学方程,准二级动力学方程,粒子扩散方程)对不同Cu~(2+)浓度、不同吸附时间的吸附曲线进行分析,探讨了吸附剂的吸附机理。结果表明准二级动力学模型的拟合度较好,海藻酸吸附Cu~(2+)是一个复杂的非均相扩散的化学吸附过程,表面络合和吸附剂内部扩散共同控制着吸附速率。交联后吸附的平衡时间延长,吸附量增大。交联后的海藻酸是一种价格低廉,绿色环保的吸附剂。 相似文献
2.
3.
4.
In order to take away much more heat on the BESⅢ beam pipe to guarantee the normal particle detection,EDM-1(oil No.1 for electric discharge machining),with good thermal and flow properties was selected as the candidate coolant for the central beryllium pipe of the BESⅢ beam pipe.Its cooling character was studied and dynamic corrosion experiment was undertaken to examine its corrosion on beryllium.The experiment results show that EDM-1 would corrode the beryllium 19.9 μm in the depth in 10 years,which is weak and can be neglected.Finite element simulation and experiment research were taken to check the cooling capacity of EDM-1.The results show that EDM-1 can meet the cooling requirement of the central beryllium pipe.Now EDM-1 is being used to cool the central beryllium pipe of the BESⅢ beam pipe. 相似文献
5.
聚磷腈的合成与应用研究进展 总被引:3,自引:0,他引:3
对近年来聚磷腈的合成及应用进行了总结和评述,探讨了聚磷腈的研究和开发应用前景。 相似文献
6.
7.
8.
Zinc alginate fiber was prepared via the self-made wet-spinning mechanism.The energy spectrum showed the fiber contained lots of zinc ion.The surface morphology of fiber was analyzed the by SEM and crystal orientation was showed clearly in the axial.Single fiber tensile test indicated the average tensile strength of 20.36cN/tex and line density of 2.79dtex. 相似文献
9.
Copolyesters of phosphorus - containing flame - retardant poly(Ethylene Terephthalate) (PET) have been prepared and characterized with the objection of producing an effective, environmentally friendly, nonfugitive alternatives to halogen flame retardant system for practical application. With means of NMR, DSC, DTA/TGA, SEM and LOI, structure, thermal property and flam-mability are investigated which reveal that the flame -retardant PET when copolymerized with 2 - carboxyethyl (phenylphosphinic) acid (CEPP) confers excellent fire retardancy with LOI > 28, broader thermal degradation temperature and increased char formation. 相似文献
10.
芳香族的溴化物在钯催化剂和六丁基二锡存在下经过均同偶联反应能生成二联芳烃.该合成方法在微波协助下只需15min便可得到60%~84%的得率,具有方便、快捷、普适等特点.各种缺电子和富电子芳烃和杂环溴化物,如苯、噻吩、呋喃、吡啶、噻唑和嘧啶的溴化物均易偶联.此方法还适应于稠环芳烃如萘、喹啉、苯并噻吩和吲哚的溴化物,且与羟基、氨基、羧基、醛基、酰基、酯基、硝基、氰基等反应性基团相容.反应是通过溴代芳烃与六丁基二锡先原位生成芳烃有机锡,芳烃有机锡再与溴代芳烃发生Stille偶联反应进行的. 相似文献