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改性生物凝胶对重金属离子的吸附性能研究 总被引:1,自引:0,他引:1
以桔子汁加工残渣为原料,制备钙型和氢型生物凝胶作为吸附剂,用于去除水溶液中的重金属离子.结果表明,上述凝胶在水溶液中稳定性较好,对重金属离子的吸附性能优良.钙型凝胶的吸附选择性顺序为:Fe3 >Pb2 >Cd2 >Zn2 ,饱和吸附容量分别为:Pb2 、Cd2 、Zn2 均为约1.1mmol/g、Fe3 为1.5mmol/g;氢型凝胶的吸附选择性顺序为:Pb2 >Zn2 >Cd2 .钙型凝胶对Fe3 的吸附行为明显不同于氢型凝胶,钙型凝胶以离子交换机理以及Fe3 与Ca2 之间的共沉淀作用为主;而氢型凝胶对Fe3 的吸附则以离子交换机理为主. 相似文献
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D. Bergé-Lefranc H. Pizzala J. L. Paillaud O. Schäf C. Vagner P. Boulet B. Kuchta R. Denoyel 《Adsorption》2008,14(2-3):377-387
Adsorption properties of zeolites were investigated for the removal of p-cresol from aqueous solutions at 37 °C within the context of studying alternative methods to dialysis for removing uremic
toxin from blood. MFI-framework type zeolites with different degrees of hydrophobicity and charge compensating cations were
prepared: one pure silica MFI and four alumino-silicate MFIs (Si/Al = 30), with H+, Na+, K+ and Mg2+ as charge compensating cations. Adsorption isotherms and microcalorimetric measurements show a high affinity of p-cresol for all MFI type zeolites. The best capacity is obtained for the pure silica MFI, whereas the alumino-silicate samples
show a higher affinity in the low concentration range. In the case of pure silica sample, the microscopic adsorption mechanism
including the role of confined water is elucidated with the help of NMR, X-ray analysis (including Rietveld refinement) and
Monte Carlo simulations. For all samples the high affinity is preserved in physiological serum solution, even in the presence
of other toxin molecules such as urea. It is also shown that the compensating cation state of the samples is imposed by the
physiological medium. 相似文献
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In Indonesia, the use of ground water is increases. It contains minerals, especially calcium and magnesium, at high concentration. This causes problems such as the crust on household appliances and higher use of soap for washing. Shell of Pistacia vera l. were study as an adsorbent of Ca and Mg in the matrix artificial hard water. Pistacia v. shell were dried and crushed into powder form. A batch experiment with various parameters was used in this research. Optimum adsorption conditions is at pH 8 and the weight of Pistacia v. shell is 1.5 g. Adsorption capacity of Ca and Mg, respectively 2.41 and 2.19 mg/g. Based on the research results, it can be concluded that the Pistacia v. shell is a very potential as a biodegradable, easy and inexpensive bioadsorbent to adsorb Ca and Mg. 相似文献
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Cynthia Urdaneta Lué-Merú Marcó Parra Saida Matute Mayantino Angel Garaboto Hayden Barros Cristina Vázquez 《Spectrochimica Acta Part B: Atomic Spectroscopy》2008
The use of vermicompost as adsorbent substrate for removing Pb, Ni, V and Cr from waste waters is proposed. In this work, after a preliminary physical and chemical characterization of the vermicompost, the optimal parameters for the heavy metal adsorption were obtained. A synthetic multielemental solution of Pb, Cr and Ni and a solution of NH4VO3 for vanadium were evaluated. The optimized parameters were pH, vermicompost mass to volume ratio, agitation time and particle size of the adsorbent. A batch system was employed for the assays. The elements were determined in the supernatant solution after filtration of the substrate. An optimal pH of 4.5 was found for ion removal. The agitation time slightly influences the adsorption of Pb and Cr, but it has a high influence on the Ni and V adsorption. The highest adsorption and removal of the metals was observed for a vermicompost mass of 2 g per 500 mL using a particle size between 75 to 841 µm for Pb, Cr and Ni, and 841 till 1192 µm for V. The mean removal percentage for each element is around 95% for Pb. Ni and Cr in the multielemental synthetic sample, demonstrating a high removal capacity of the substrate. For V it was found a removal efficiency of 50%. 相似文献
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