Biosorption of chromium by Termitomyces clypeatus. 2007

Sujoy K Das, and Arun K Guha
Department of Biological Chemistry, Indian Association for the Cultivation of Science, 2A&B, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India. sujoy_iacs@yahoo.co.in

The manuscript describes removal of chromium from aqueous solution by biomass of different moulds and yeasts. The biomass of Termitomyces clypeatus (TCB) is found to be the most effective of all the fungal species tested. The sorption of hexavalent chromium by live TCB depends on the pH of the solution, the optimum pH value being 3.0. The process follows Langmuir isotherm (regression coefficient 0.998, chi(2)-square 5.03) model with uniform distribution over the surface which gets strong support from the X-ray elemental mapping of chromium adsorbed biomass. The amino, carboxyl, hydroxyl, and phosphate groups of the biomass are involved in chemical interaction with the chromate ion forming a cage like structure depicted by scanning electron microscopic (SEM) and Fourier transform infrared spectroscopic (FTIR) results. Desorption and FTIR studies also exhibited that Cr(6+) is reduced to trivalent chromium on binding to the cell surface. The level of chromium concentration present in the effluent of tannery industries' is reduced to a permissible limit using TCB as adsorbent.

UI MeSH Term Description Entries
D002857 Chromium A trace element that plays a role in glucose metabolism. It has the atomic symbol Cr, atomic number 24, and atomic weight 52. According to the Fourth Annual Report on Carcinogens (NTP85-002,1985), chromium and some of its compounds have been listed as known carcinogens.
D000327 Adsorption The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily. Adsorptions
D000363 Agaricales An extensive order of basidiomycetous fungi whose fruiting bodies are commonly called mushrooms. Agaricaceae,Mushrooms,Agaricale,Mushroom
D017550 Spectroscopy, Fourier Transform Infrared A spectroscopic technique in which a range of wavelengths is presented simultaneously with an interferometer and the spectrum is mathematically derived from the pattern thus obtained. FTIR,Fourier Transform Infrared Spectroscopy,Spectroscopy, Infrared, Fourier Transform
D052918 Environmental Restoration and Remediation Restoration of an environment, ecosystem, or habitat that was physically damaged during land development or by natural disaster, or contaminated by ENVIRONMENTAL POLLUTANTS. This is accomplished by various chemical, biological, and bulk movement methods, in conjunction with ENVIRONMENTAL MONITORING. Environmental Cleanup,Environmental Remediation,Environmental Restoration,Pollution Remediation,Site Remediation,Cleanup, Environmental,Cleanups, Environmental,Environmental Cleanups,Environmental Remediations,Remediation, Environmental,Remediation, Pollution,Remediation, Site,Remediations, Environmental,Remediations, Site,Restoration, Environmental,Site Remediations
D018533 Biomass Total mass of all the organisms of a given type and/or in a given area. (From Concise Dictionary of Biology, 1990) It includes the yield of vegetative mass produced from any given crop. Biomasses

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