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排序方式: 共有71条查询结果,搜索用时 281 毫秒
1.
模糊正交法用于石墨炉探针原子化测定铋条件的研究 总被引:3,自引:0,他引:3
模糊正交法是通过把正交试验结果模糊化,然后用模糊数学的理论和方法来处理实验数据。与常规正交设计相比,能在同样实验工作量的情况下获得更多的信息。本文采用模糊正交法对元素Bi的测定条件进行优化,并将其同常规正交设计方差分析的结果进行了比较,并提出一个综合评价参数,对建立的分析方法进行了综合评价。 相似文献
2.
红背桂树叶提取物绿色合成铁纳米颗粒(Fe NPs)在水环境修复领域具有很高的应用潜力。但由于Fe NPs存在团聚、易氧化等不稳定因素,在去除污染物时抑制了反应活性。为了解决这一问题,使用一步法制备了高岭土负载Fe NPs (K-Fe NPs),并系统地检测了其对孔雀石绿和Pb2+混合污染物的去除反应活性。采用X射线衍射(XRD)和傅里叶红外光谱(FTIR)对Fe NPs、高岭土和K-Fe NPs进行表征和分析。3种材料对比实验结果表明,K-Fe NPs对单独的孔雀石绿和Pb2+的去除效率(99.10%和93.41%)优于Fe NPs(93.67%和85.33%)和高岭土(32.54%和12.50%)。此外,K-Fe NPs经过4次重复循环对孔雀石绿和Pb2+的去除率仍分别为74.02%和55.48%。结果表明,K-Fe NPs在染料和重金属离子复合污染修复领域具有一定应用前景。 相似文献
3.
Summary PLOT columns have been prepared with kaolin as the liquid phase support. These columns show good efficiency with different stationary phases and good thermal stability with polar phases. The performance of columns is shown by the separation of various mixtures such as fatty acids, phenols and anilines which are of analytical importance. 相似文献
4.
利用物料在超细粉碎过程中的机械力效应,以振动磨为载体和工具,对用作橡胶补强剂的高岭土材料进行了一系列机械力化学改性实验,探讨了偶联剂种类、改性剂投入时间和持续作用时间等工艺参数对改性效果的影响,实验结果对同类的研究提供了借鉴依据. 相似文献
5.
Farhad Shirini Nader Ghaffari Khaligh Gholam Hossein Imanzadeh Parisa Ghods Ghasem-Abadi 《中国化学快报》2012,23(10):1145-1148
1,3-Dibromo-5,5-dimethylhydantoin,has been used as an efficient catalyst for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes in the presence of kaolin.All reactions are performed in the absence of solvent in relatively short reaction times in good to high yields. 相似文献
6.
《Arabian Journal of Chemistry》2020,13(2):4111-4125
The extreme nitrate (NO3−) species in drinking water leads to methemoglobinemia (blue baby syndrome) disease in new born toddlers whereas the excess phosphate (PO43−) and NO3− contents lead to the eutrophication (algae growth) problem of water sources. Upto date, the environmental researchers have developing the suitable adsorbent materials for providing NO3− and PO43− free water system. In present study, a low-cost alginate (Alg) assisted kaolin (KN) (AlgKN) composite beads were prepared and utilized for the removal of NO3− and PO43−. To improve the sorption capacity (SC) and stability, Zr4+ ions were coated onto AlgKN to get Zr@AlgKN composite beads which were prepared via., hydrothermal (Hydro) and in situ precipitation (In situ) methods. The hydro assisted Zr@AlgKN composite beads possess an enhanced SC than the in situ assisted adsorbents. In batch scale, the parameters responsible for the adsorption process such as contact time, co-ions, adsorbent dosage, pH, initial ions concentration and temperature were optimized. The adsorbents were characterized by XRD, FTIR, BET, EDAX and SEM analysis. The adsorption experimental data was fitted with isotherms, kinetics and thermodynamic parameters. The regeneration and field applicability study of the Zr@AlgKN composite beads were also investigated. 相似文献
7.
8.
聚丙烯酸-高岭土杂化高吸水材料的合成与性能 总被引:14,自引:0,他引:14
在高岭土存在下,以N-N-亚甲基双丙烯酰胺作交联剂,以过硫酸钾作引发剂,部分中和的丙烯酸单体进行聚合交联反应,合成高聚物/无机杂化高吸水性材料,采用正交设计法,研究中和度,单体用量,引发剂量,交联剂量,高岭土加入量及反应温度对吸水率的影响。 相似文献
9.
The self-consistent model of heat and mass transfer during convective drying of capillary porous media describing both the
first and the second periods of drying is presented in Musielak (Wydawnictwo Politechniki Poznańskiej, seria Rozprawy, nr
386 (2004a); Chem. Process Eng. 25, 393–409 (2004b)). The results of simulations of processes in steady conditions are shown (Musielak Wydawnictwo Politechniki
Poznańskiej, seria Rozprawy, nr 386 (2004a); Chem. Process Eng. 25, 393–409 (2004b)). The main aim of the present work is to compare experimental results with those from numerical simulations.
Three convective drying processes have been performed experimentally. The first and the second periods of drying are considered,
during which the humidity of air in the dryer changes due to evaporation. The first process is used to establish drying parameters,
whereafter the two remaining processes are simulated. Good agreement between experimental and simulation results is found,
both qualitative and quantitative. 相似文献
10.
分析高岭土选矿中难洗涤的原因。导出了多级间歇洗涤模型,提出了解决问题的办法,使漂白洗涤过程得到强化,缩短了漂洗时间,降低了用水量。 相似文献