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Daniela Suteu Doina Bilba Magdalena Aflori Florica Doroftei Gabriela Lisa Marinela Badeanu Teodor Malutan 《洁净——土壤、空气、水》2012,40(2):198-205
This study investigates structural and adsorption properties of the powdered waste shells of Rapana gastropod and their use as a new cheap adsorbent to remove reactive dye Brilliant Red HE‐3B from aqueous solutions under batch conditions. For the powder shells characterization, solubility tests in acidic solutions and X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDX), Fourier transform IR spectroscopy (FT‐IR) and thermogravimetric analyses were performed. The results revealed that the adsorbent surface is heterogeneous consisting mainly from calcium carbonate layers (either calcite or aragonite) and a small amount of organic macromolecules (proteins and polysaccharides). The dye adsorptive potential of gastropod shells powder was evaluated as function of initial solution pH (1–5), adsorbent dose (6–40 g L?1), dye concentration (50–300 mg L?1), temperature (5–60°C), and contact time (0–24 h). It was observed that the maximum values of dye percentage removal were obtained at the initial pH of solution 1.2, shells dose of 40 g L?1, dye initial concentration of 50–50 mg L?1 and higher temperatures; the equilibrium time decreases with increasing of dye concentration. It is proved that the waste seashell powder can be used as low cost bioinorganic adsorbent for dyes removal from textile wastewaters. 相似文献
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The Canadian government's imaginative approach to fostering scientific excellence produced an environment ideal to draw the very best from Uki Helava's fertile intellect when he joined the Photogrammetric Section, Division of Physics, NRC, Ottawa in 1953. Initial work on error control in aerial triangulation led into the design of instruments for image measurement. This work culminated in the production of the NRC Monocomparator, but Helava's main effort was devoted to the analytical plotter, for which a working model was exhibited in 1963. Difficulties with the commercialization of this device led to Helava's decision to leave NRC in 1965. 相似文献
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