Biosorption Of Mn Research Articles

Removal of Mn (II) from aqueous environment using Eucheuma spinosum

Eucheuma spinosum is one of the seaweed species that can be found abundantly in Takalar Regency. The biomass of this seaweed has been used to remove Mn (II) ion from the aqueous solution via the adsorption process using E. spinosum. The adsorption of Mn (II) ion was studied in various contact time, pH and concentration. An Atomic Absorption Spectrophotometer (AAS) was an instrument used to determine the amount of ion before and after adsorption. Langmuir and Freundlich’s equations were used to study the adsorption isotherms of the ion. The results showed that the optimum time obtained was 20 minutes and the optimum pH was 4. The Freundlich isotherm fitted the adsorption of ion Mn (II) using E. spinosum with the capacity (Qo) of 4.13 mg/g. The functional group involved in biosorption of Mn (II) metal ions was hydroxyl (-OH) groups.

Biomass Enriched with Minerals via Biosorption Process as a Potential Ingredient of Horse Feed

In the present work, dry plant biomass that is commonly used in horses feeding: alfalfa, chopped grass pellets and chopped grass was used as a biosorbent of microelement ions: Cr(III), Zn(II), Cu(II) and Mn(II). Biosorption process was used to potentially enhance supplementation of minerals in horses diet. In order to characterize the biosorption properties of the examined biomass, preliminary experiments (kinetics and equilibrium studies) were conducted with Cr(III) ions. The effect of pH and initial metal ions concentration (C0) on the biosorption capacity (q) was investigated. On this basis, the best experimental conditions were chosen (pH 5, CS 1.0 g/L (biomass content), C0 200 mg/L). For them, biosorption of Mn(II), Zn(II), Cu(II) ions was carried out in a periodic and continuous system (biosorption column). Equilibrium of the biosorption was described using Langmuir equation. The mineral composition of the raw and enriched biomass was also examined using ICP-OES, as well as SEM-EDX technique. In general, the best biosorption properties were observed for alfalfa. The maximum biosorption capacity for Zn(II) was 27.5 mg/g, for Cu(II)—38.5 mg/g, for Mn(II)—13.6 mg/g and for Cr(III)—33.2 mg/g. Therefore, the biomass of enriched alfalfa can be recommended as a feed supplement for horses.

Evaluation of Mn bioaccumulation and biosorption by bacteria isolated from spent nuclear fuel pools using54Mn as a radioindicator

AbstractBioaccumulation and biosorption characteristics of Mn2+ions by both dead and living, non-growing biomass of Gram-positive bacteriaKocuria palustrisandMicrococcus luteusisolated from spent nuclear fuel pools were compared. The radioindicator method using radionuclide54Mn was applied to obtain precise and reliable data characterizing both processes as well as manganese distribution in bacterial cells. Manganese was mainly found on the surface (biosorption) of live cells of both bacteria and surface sorption capacity increased with Mn concentration in solution. Only 10.0% (M. luteus) and 6.3% (K. palustris) of uptaken Mn were localized in the cytoplasm (bioaccumulation). Biosorption of Mn by dead bacterial biomass was a rapid process strongly affected by solution pH. Maximum sorption capacitiesQmaxcalculated from the Langmuir isotherm and characterizing Mn binding represented 316±15 μmol/g forM. luteusand 282±16 μmol/g forK. palustris.Results indicate that living, non-growing cells showed a higher efficiency of Mn removal than dead biomass. Based on FTIR spectra examination with aim to characterize the surface ofK. palustrisandM. luteuscells, we confirmed that the phosphate and carboxyl functional groups are involved in manganese sorption onto cell surface by both live and dead bacterial biomass.

Biosorption of Mn(II) ions from Aqueous Solution by Pleurotus Spent Mushroom Compost in a Fixed-Bed Column

The Pleurotus spent mushroom compost have been identified as a low-cost biosorbent for heavy metals removal. The Mn(II) ions removal from aqueous solution was conducted in a fixed-bed column. The effect of various parameters such as flow rate, bed height and initial concentration on Mn(II) ions biosorption were investigated. The results of breakthrough time, exhaustion time as well as the Mn(II) uptake and percentage of removal are highly influenced by the flow rate, bed height and the initial Mn(II) concentration. The results demonstrated that the breakthrough time and exhaustion time increased with decreases of flow rate and initial Mn(II) concentration and increased of bed height. The results of EDX confirmed that the Mn(II) ions presence on the surface of Pleurotus spent mushroom compost after biosorption process and the FTIR identified the carboxyl, hydroxyl and amide functional groups as the active binding sites for Mn(II) ions biosorption.

Biosorption of Mn(II) by ripped Citrus paradisi pulp waste

The current exploration presents a primary study on the uptake of Mn(II) by ripped Citrus paradisi pulp waste (RCPW). The effects of various engineering parameters such as biosorbent dose, agitation, contact time, initial concentration, temperature, and different eluents were evaluated. Pseudo-second-order kinetic model fits well with the process, and uptake of Mn(II) by RCPW showed monolayer formation as enumerated by Langmuir’s model. Increased temperature enhanced the biosorption capacity indicating endothermic nature of the phenomenon. Among HNO3, H2SO4, HCl, and EDTA, 0.1 N NaOH was found to be the best desorbing agent.

Biosorption of Mn (II), Co (II) and Cr (VI) in a horizontal rotating tubular bioreactor: experiments and evaluation of the integral bioprocess model

In this research, a multi heavy metals removal process with mixed microbial culture was examined in a horizontal rotating tubular bioreactor (HRTB) with different combinations of process parameters. Three metals were selected as examples of cations (manganese and cobalt) and oxy-anion (hexavalent chromium). Hydrodynamic conditions and biomass sorption capacity in the HRTB had the main impact on the heavy metals removal efficiencies, which were for Mn2+ 87.0-93.6%, Co2+ 89.0-95.7% and Cr6+ 99.7-100%, respectively. For the bioprocess description in the HRTB, the integral bioprocess model that combines hydrodynamics, mass transfer and kinetics was used. This model was evaluated for the new experimental conditions and average variances between experimental and simulated data were in the range of 0.12 - 3.21·10-3. The results obtained clearly show that the integral bioprocess model is able to describe the heavy metal removal process in the HRTB.

Biosorption of Mn(II) by Immobilizing Dominant Bacteria on the Surface of Chitosan Cross-Linked GAC Beads

A static test was applied to study the biosorption of Mn (II) by immobilized dominant bacteria on the surface of chitosan cross-linked GAC(CCG) beads. The Citrobacter sp. was selected from the source water of the Shenyang first water treatment plant. Citrobacter sp. was immobilized on the surface of chitosan cross-linked GAC beads successfully. Langmuir models were applied to describe the isotherms. The Mn (II) removal rate was evaluated by the different dose rate and different contact time of the CCG beads. Results showed the dominant bacteria immobilized on chitosan cross-linked GAC beads were favourable adsorbers.

The alteration of cell membrane of sulfate reducing bacteria in the presence of Mn(II) and Cd(II)

In this work, the effects of manganese and cadmium on the biosorption, cell membrane and growth of a sulfate reducing bacteria (SRB) strain were studied in detail. The strain of SRB used in this studied belongs to Salmonella named as Salmonella Daqing, which is isolated from Daqing oil field, China. Because of electrostatic attraction, Mn 2+ and Cd 2+ can be absorbed on the cell surface with negative charges. After biosorption of Mn 2+ and Cd 2+ on the cell surface, the morphological character of the cells changed, even some cells were almost completely deformed. The fluorescence polarization has shown a significant decrease in membrane fluidity and the increase of permeability of cell membrane. Ion analysis also revealed that permeability of cell membrane increased because of damage of cell membrane. Changes of the spectral profile of S. Daqing MF were also observed, suggesting the damages of surface groups on the cell membrane. Furthermore, low concentration of metal ions can promote growth of the bacteria, while high concentration has inhibitory effects on S. Daqing MF. The reason is attributed to the easier absorbability of nutrition due to the increased cell permeability.

Equilibrium, thermodynamic and kinetic studies on biosorption of Mn(II) from aqueous solution by Pseudomonas sp., Staphylococcus xylosus and Blakeslea trispora cells

Biosorption of Mn(II) from aqueous solutions using Pseudomonas sp., Staphylococcus xylosus and Blakeslea trispora cells was investigated under various experimental conditions of pH, biomass concentration, contact time and temperature. The optimum pH value was determined to 6.0 and the optimum biomass concentration to 1.0 g L −1 for all types of cells. Mn(II) biosorption was found to fit better to the Langmuir model for Pseudomonas sp. and B. trispora and to Freundlich model for S. xylosus. Langmuir model gave maximum Mn(II) uptake capacity 109 mg g −1 for Pseudomonas sp. and much lower, 59 mg g −1 and 40 mg g −1 for S. xylosus and B. trispora, respectively. Pseudo-second-order kinetic model was also found to be in good agreement with the experimental results. Thermodynamic parameters of the adsorption confirmed the endothermic nature of sorption process with positive heat of enthalpy, accompanied by a positive value of entropy change. Interestingly, desorption experiments by treating biomass with 0.1 M HNO 3 solution resulted to more than 88% recovery of the adsorbed Mn(II) from Pseudomonas sp. and almost 95% and 99% from S. xylosus and B. trispora cells respectively, thus indicating that Mn(II) can be easily and quantitatively recovered from biomass.

Edible macroalga Ulva prolifera as microelemental feed supplement for livestock: the fundamental assumptions of the production method

In the present paper, the possibility of the application of marine macroalga Ulva (Enteromorpha) prolifera, as microelemental feed supplement for livestock, was evaluated. The concept was based on two facts: the natural macroalga contains high concentrations of microelements and there is a possibility to greatly increase this content via biosorption. In order to characterize the biosorption process of metal ions by U. prolifera, preliminary experiments were conducted with Cr(III) ions. The effect of temperature, pH and the biomass concentration on the equilibrium of biosorption was investigated. For further experiments (biosorption of Mn(II), Zn(II), Cu(II), Co(II)), the following experimental conditions were chosen: pH 5, 25°C, the biomass concentration 1.0 g l−1. Equilibrium of the biosorption process could be described by the Langmuir equation. The theoretical maximum biosorption capacity was also determined by potentiometric titration of the biomass. The investigation of the external structure of the macroalga and atomic concentration of elements on the surface of the biomass was analyzed using scanning electron microscopy. The content of microelements in the biomass after biosorption increased 110,555; 44,228; 21,177; 2,281 and 1,458 times for Co(II), Cr(III),Cu(II), Zn(II), Mn(II), respectively. Therefore, biomass of U. prolifera enriched with individual microelements, mixed in the proper proportion could be used as feed supplement in animal feeding to cover the nutrient requirements for microelements.

Anions effects on biosorption of Mn(II) by extracellular polymeric substance (EPS) from Rhizobium etli.

Microbial extracellular polymeric substances (EPS) are potential biosorbents for metal remediation and recovery. The Langmuir and Freundlich kinetics of Mn(II) binding by the EPS from a novel Mn(II) oxidising strain of Rhizobium etli were determined. Maximum manganese specific adsorptions (q(max)) decreased in the sequence: sulphate (62 mg Mn per g EPS) > nitrate (53 mg g(-1)) > chloride (21 mg g(-1)). Consideration of the anion during kinetic studies is usually neglected but is important in providing more practical and comparable data between different biosorbent systems.