Biosorption of hexavalent chromium using biofilm of E. coli supported on granulated activated carbon

Abstract

The optimization of hexavalent chromium biosorption has been studied by using three different biosorbents; biofilm of E. coli ASU 7 supported on granulated activated carbon (GAC), lyophilized cells of E. coli ASU 7 and granulated activated carbon. Supporting of bacteria on activated carbon decreased both the porosity and surface area of the GAC. Significant decrement of surface area was correlated to the blocking of microspores as a result of the various additional loads. The experimental data of adsorption was fitted towards the models postulated by Langmuir and Freundlich and their corresponding equations. The maximum biosorption capacity for hexavalent chromium using biofilm, GAC and E. coli ASU 7 were 97.70, 90.70, 64.36 mg metal/g at pH 2.0, respectively. Biosorption mechanism was related mainly to the ionic interaction and complex formation. Based on the experimental conditions, the presence of bacteria could be enhanced the capacity of activated carbon to adsorb hexavalent chromium ions from aqueous solutions.

Potential capacity of Beauveria bassiana and Metarhizium anisopliae in the biosorption of Cd2+ and Pb2+

“…The data obtained from this experiment was further used successfully to evaluate the kinetics of the adsorption process. This short time required for biosorption is in accordance with the results given by other authors (Gabr et al, 2009;Joo et al, 2010;Sar et al, 1999;Tomko et al, 2006;Volesky, 1990;Zouboulis et al, 2004). Gabr et al (2008) showed that the maximum biosorption of lead and nickel by P. aeruginosa ASU 6a.…”

“…To overcome the disadvan-tages of accumulation in microorganisms; non-viable or dead biomass is preferred (Butter et al, 1998). The role of various microorganisms as biosorbents in the removal and recovery of heavy metal(s) has been well reviewed and documented (Gabr et al, 2008(Gabr et al, , 2009Hassan et al, 2009;Joo et al, 2010;Oh et al, 2009).…”

Cr(VI) sorption by using clinoptilolite and bacteria loaded clinoptilolite rich mineral

“…In recent years, bacteria species supported materials have been used as alternative material. Arthrobacter viscosus supported granular activated carbon and NaY, Escherichia coli supported granular activated carbon, kaolin and NaY zeolite are used in the Cr(VI) removal [36][37][38][39][40][41]. It has been found that the affinities of granular activated carbon, kaolin and NaY zeolite were improved by the attachment of bacteria species on the material surface.…”

Iron and lead ion adsorption by microbial flocculants in synthetic wastewater and their related carbonate formation

“…Langmuir isotherm and Freundich isotherm (Gabr et al, 2009;Kularatne et al, 2009) can be expressed, respectively, as following Eqs. (4) and (5):…”