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Effect of the chelating agents on bio-sorption of hexavalent chromium using Agave sisalana fibers

Chinese Journal of Chemical Engineering 2018年第5期26卷 984-992页

作者： H. Bendjeffal A. Djebli H. Mamine T. Metidji M. Dahak N. Rebbani Y. Bouhedja Higher School of Technological Education ENSET-Skikda 21000 Algeria Laboratory of Water Treatment and Valorization of Industrial Wastes Badji-Mokhtar University P.O. Box 12 Annaba 23000 Algeria Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques BP 384 Siege ex-Pasna Zone Industrielle Bou-Ismail CP 42004 Tipaza Algeria

The current work is focused on the study of the bio-sorption of hexavalent chromium from aqueous solution using sisal natural fiber(Agave sisalana) treated by various chelating agents(ligands) such as urea(UR),thiocarbamide(TC), ethylenediaminetetraacetic acid(EDTA), and diphenyl carbazide(DCZ). The fiber treatments were investigated using Fourier Transform Infrared Spectroscopy(FTIR) and Scanning electron microscope(SEM). The kinetics of chromium bio-sorption was studied in batch presses under the effect of some physicochemical factors such as the nature of chelating agent(F@UR, F@TC, F@DCZ, and F@EDTA),adsorbent dose(2–10 g·L^(-1)), chromium initial concentration(100–500 mg·L^(-1)), solution pH(1–6), and batch temperature(20 ℃–50 ℃). This study resulted in an optimum adsorption at a chromium initial concentration of 100 mg·L^(-1), at pH 2, and at 20 ℃. The obtained results showed clearly that the treatment with chelating agent boosts the adsorptive capacity of A. sisalana fibers Cr(VI) 10.9 mg·g^(-1) to 58.6 mg·g^(-1). The modeling study showed that the adsorption kinetics obey the pseudo-second-order model, with an R2 in the range of 0.991 and 0.999. The bio-sorption isotherms followed the Langmuir model; the maximum uptake capacity of(F@N, F@UR,F@TC, F@DCZ, and F@EDTA) was found to be respectively, 12.3 mg·g^(-1), 25.33 mg·g^(-1), 28.73 mg·g^(-1),42.54 mg·g^(-1), and 61.45 mg·g^(-1). The determined adsorption thermodynamics parameters such as enthalpy,free energy, and entropy showed that the adsorption process is exothermic, spontaneous, and has a stable configuration.

关键词： Agave sisalana bio-sorption Chelating agent Chromium(VI) Fibers

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Properties and characterization of Au^(3+)-adsorption by mycelial waste of Streptomyces aureofaciences

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Chinese Science Bulletin 2001年第20期46卷 1709-1712页

作者： LIU Yueying, FU Jinkun, HU Hongbo, TANG Dingliang, Nl Zimian & YU Xinsheng1. Department of biology, 2. State Key Laboratory for Physical Chemistry of Solid Surface, 3. Center for Analysis & Testing, Xiamen University, Xiamen 361005, China Department of biology Xiamen University Xiamen China State Key Laboratory for Physical Chemistry of Solid Surface Xiamen University Xiamen China Center for Analysis & Testing Xiamen University Xiamen China

Mycelial waste of Streptomyces aureofaciences procured from the aureomycin fermentation industry is used as biosorbent for Au3+. The properties of Au3+ adsorption by the mycelial waste are studied. The results indicate that the optimum pH value of Au3+ adsorption is 3.5. The biosorption is a rapid and non-temperature-dependent process. The bio-sorptive capacity with 45.6 mg/g and efficiency with 91.2% are achieved under the conditions of pH 3.5 and 30℃ for 45 min, in which the ratio is 50 mg/g dry weight for the concentrations of initial Au3+ and the mycelial waste. The Au3+ ions adsorbed on the mycelial waste can be eluted. The observation in a transmission electron microscope shows that the Au3+ ions can be reduced to Au particles by the mycelial waste and the Au can become gold crystals with differentforms and sizes. X-ray photoelectron spectroscopy analysis further proves that the Au3+ can be reduced to Au0 by the mycelial waste.

关键词： Streptomyces aureofaciences mycelial waste gold bio-sorption gold crystal characterization.

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Uranium bio-Transformations: Chemical or biological Processes?

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Open Journal of Inorganic Chemistry 2017年第2期7卷 28-60页

作者： Erica L.-W. Majumder Judy D. Wall Department of biochemistry University of Missouri Columbia MO USA

Uranium bio-transformations are the many and varying types of interactions that microbes can have with uranium encountered in their environment. In this review, bio-transformations, including reduction, oxidation, respiration, sorption, mineralization, accumulation, precipitation, biomarkers, and sensors are defined and discussed. Consensus and divergences are noted in bioavailability, mechanism of uranium reduction, environment, metabolism and the type of organism. The breadth of organisms with characterized bio-trans formations is also cataloged and discussed. We further debate if uranium biotransformations provide bio-protection or bio-benefit to the microbe and highlight the need for more work in the field to understand if microbes use uranium reduction for energy gain and growth, as having the ability is separate from exercising it. The presentation centers on the fundamental drivers for these processes with an additional exposition of the essential contribution of inorganic chemistry techniques to the molecular characterization of these biological processes.

关键词： Uranium Reduction bio-sorption Proteobacteria

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