Reduction of chromium (VI) from aqueous solution by biomass of Cladosporium cladosporioides

The capacity of Cladosporium cladosporioides biomass for removal of Cr(VI) in aqueous solutions was evaluated. A 2 × 2 factorial experiment design was used to study the effects of pH and biomass doses. Lower pH values and larger biomass doses increased the capacity of C. cladosporioides biomass for...

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Bibliographic Details
Published in:Water science and technology 2017-11, Vol.76 (9-10), p.2494-2502
Main Authors: Garza-González, María Teresa, Ramírez-Vázquez, Jonathan Eduardo, García-Hernández, María de Los Ángeles, Cantú-Cárdenas, María Elena, Liñan-Montes, Adriana, Villarreal-Chiu, Juan Francisco
Format: Article
Language:English
Subjects:
Adsorption
Amino groups
Analytical methods
Aqueous solutions
Aspergillus
Aspergillus niger
Biomass
Bioremediation
Biotechnology
Capacity
Chromium
Cladosporium
Consortia
Design of experiments
Developing countries
Drinking water
Engineering
Environmental protection
Environmental science
Factorial experiments
Fourier transforms
Fungi
Infrared spectra
Infrared spectroscopy
LDCs
National parks
Oxidoreductions
pH effects
Redox reactions
Reduction
Removal
Solutions
Studies
Ustilago maydis
Water treatment
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Summary:The capacity of Cladosporium cladosporioides biomass for removal of Cr(VI) in aqueous solutions was evaluated. A 2 × 2 factorial experiment design was used to study the effects of pH and biomass doses. Lower pH values and larger biomass doses increased the capacity of C. cladosporioides biomass for removal of Cr(VI), reaching a reduction capacity of 492.85 mg g , a significantly higher value compared to other biomass reported. Cr(VI) removal kinetic rates followed a pseudo-second order model, like other fungal biomass reported previously. The apparent adsorption process was described well by the Freundlich isothermal model. However, determination of total chromium indicated that adsorption of Cr(VI) was followed by a redox reaction that released proportional quantities of Cr(III) into the experimental supernatant, suggesting a parallel adsorption-reduction process. Comparison of Fourier transform infrared spectroscopy spectra of C. cladosporioides biomass before and after the reduction process demonstrated the involvement of positively charged amino groups in the Cr(VI) adsorption-reduction process.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2017.427