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Mykhaylo Yatsyshyn Ivan Saldan Chiara Milanese Viktoriia Makogon Alberto Zeffiro Vittorio Bellani Rosadele Di Lorenzo Pacifico Cofrancesco Alessandro Girella Daniele Dondi Oleksandr Reshetnyak Sergiy Korniy 《Journal of Polymers and the Environment》2016,24(3):196-205
Hybrid composite made of glauconite and polyaniline was prepared in aqueous solution of citric acid. Scanning electron microscopy combined with energy dispersive X-ray analysis shows uniform aggregates made of glauconite microparticles and polyaniline matrix. The results of X-ray powder diffraction suggest that: (1) citric acid used for the polymerisation of aniline causes formation of emeraldine salt where macromolecular ordering in the amorphous polymer takes place; (2) no chemical interaction between glauconite and emeraldine takes place in the prepared composite. FT-IR spectra of the prepared polymer and composite show features indicating all the functional groups that are present in the diiminoquinone–diaminobenzene state of polyaniline. Thermal stability of the composite was higher than the prepared polymer suggesting the occurrence of an interphase interaction between glauconite and emeraldine. After pyrolysis in purified nitrogen the composite still remained glauconite, and ε-Fe3N together with amorphous and graphitic carbon were found as reaction products. The values of electrical conductivity and magnetization of the composite suggest that optimization of these values might be achieved based upon the relationship between glauconite and polyaniline. 相似文献
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In this study the influence of environmental conditions, most likely prevailing in filter beds used for intermittently discharged pollutant streams such as landfill leachate and storm water, on the stability of the heavy metal-filter complex was investigated for 2 filter materials; non-treated and urea treated pine bark, using leaching experiments. The metal-filter complex stability was higher for urea treated than for non-treated pine bark and dependent on the metal adsorbed. The type of environmental condition applied was of less importance for the extent of leaching. 相似文献
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Ruth Gingold Manuel Mundo-Ocampo Oleksandr Holovachov Axayácatl Rocha-Olivares 《Marine Biology》2010,157(8):1741-1753
The role of habitat complexity has been widely neglected in the study of meiofaunal community patterns. We studied the intertidal
nematode community of a structurally complex macrotidal beach exhibiting contrasting microhabitats (sandbars and runnels)
to understand the influence of environmental gradients and habitat heterogeneity in the community structure. We tested whether
topographical complexity affected (1) the zonation pattern in terms of abundance and diversity, and (2) local diversity by
promoting compartmentalization into distinct faunal groups. Our analyses revealed three major faunal assemblages along the
exposure gradient associated to differences in mean grain size and chlorophyll a. Diversity patterns involved a mid-intertidal peak, consistent with the intermediate disturbance hypothesis, and another
peak at the limit with the subtidal region, consistent with the transition zone. These results highlight the predominance
of environmental gradients in establishing intertidal zonation. However, microhabitats differed in environmental conditions
and possessed significantly distinct nematofaunal communities. Runnels featured higher levels of taxonomic and functional
diversity, many unique genera, and the community differed from the assemblage at the limit to the subtidal, stressing their
role as distinct microhabitats. The nematofauna of the structurally complex beach was more diverse than the one from a homogeneous
beach nearby, supporting the hypothesis that structural heterogeneity promotes diversity by compartmentalization and highlighting
the importance of microhabitats in the assessment of biodiversity. Contrary to previous predictions, our results indicate
potentially high regional marine nematode diversity in the Upper Gulf of California. 相似文献
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