Claudia Maria SIMONESCU, Romulus DIMA, Mariana FERDES, Aurelia MEGHEA<br>Equilibrium and Kinetic Studies on the Biosorption <br>of Cu(II) onto Aspergillus niger  Biomass

Claudia Maria SIMONESCU, Romulus DIMA, Mariana FERDES, Aurelia MEGHEA
Equilibrium and Kinetic Studies on the Biosorption
of Cu(II) onto Aspergillus niger Biomass

Abstract:

The solid and liquid waste with heavy metal content that are discharged direct or indirect in environment determine negative effects for organisms, and environment. The main heavy metals found in wastewaters and solid wastes are cadmium, chromium, lead, nickel, zinc, copper, mercury, and arsenic. From these heavy metals, copper in high concentrations determines significant health problems such as hemochromatosis, gastrointestinal diseases, and “Wilson’s Disease”. Usually, copper toxicity increases in the presence of small amounts of Mo+2 ions, Zn+2 and SO42-. Therefore copper must be removed from wastewaters using various methods. Sorption is one of the most important processes involved in heavy metals, metals and metalloids removal from wastewaters. For sorption can be used synthetic, natural, and biological materials. Biological materials are preferred in heavy metals biosorption because they have many advantages such as: the presence of a large variety of functional sites (imidazole, carboxyl, amino, phosphate, sulphydryl, phenol, thioether, amide, carbonyl and sulphate) that can be used to bond and to retain pollutants, especially heavy metals from aqueous synthetic solutions or real wastewaters. Compared with conventional methods used in heavy metal removal from wastewaters, biosorption is a more effective alternative to decrease the concentration of heavy metal ions in solution from ppm to ppb level by using low cost materials. Usually this process is one faster than the other heavy metals removal processes. Among the promising biosorbents for heavy metals removal we chose the strain Aspergillus niger ATCC 22343 in order to remove Cu(II) from synthetic waters which contain copper sulfide nanoparticles. The kinetic data obtained for the Cu(II) biosorption onto Aspergillus niger ATCC 22343 were analyzed using the pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion equations. Kinetic parameters, like rate constants, equilibrium adsorption capacities, and correlation coefficients for Freundlich and Langmuir kinetic models were calculated and discussed. The Langmuir model agreed better with the biosorption of copper ions onto Aspergillus niger ATCC 22343. Keywords: copper removal, Aspergillus niger, biosorption

Issue: 2012, Volume 63, Issue 2

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