Cadmium removal from water environment by a fungus Volveriella volvacea

Osman, Mohamed Syazwan; Bandyopadhyay, Mausumi

doi:10.1007/s004490050212

Cited by 3 publications

(6 citation statements)

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“…In Figs 2 and 3 the percentage of Cu(II) and Ni(II) removed from solution against the equilibrium pH has been plotted for cork and yohimbe respectively. As can be seen, in both cases the metal uptake is strongly dependent on pH, which has also been reported for some other biomaterials 6. 11 Both biomaterials display maximum metal uptake at pH values near neutrality.…”

Section: Resultssupporting

confidence: 81%

“…Thus, here it seems that electrostatic attraction plays an important role in the removal of copper and nickel ions by cork. Some authors explain the reduction of metal removal percentage by the presence of competing Na + ions for metal binding,12 nevertheless this reduction can also be explained on the basis of the different ionic species present at different chloride concentrations 6. Looking at the distribution diagrams of copper and nickel species as a function of chloride concentration it can be noticed that an increase in chloride concentration reduces the Cu 2+ and Ni 2+ species due to the formation of chloro‐complexes 15.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the removal of some heavy metals by sunflower stalks and mushrooms has been reported 5. 6 It should also be noted that the toxicity associated with metal ion accumulation is not a problem when non‐living materials are used.…”

Section: Introductionmentioning

confidence: 99%

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Heavy metal uptake from aqueous solution by cork and yohimbe bark wastes

Villaescusa,

Mart�nez,

Miralles

2000

J. Chem. Technol. Biotechnol.

107

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In this work the ability of cork and yohimbe bark wastes to remove Cu(II) and Ni(II) from aqueous solutions has been studied. The in¯uence of pH, sodium chloride and metal concentration on metal uptake was investigated. Metal uptake showed a pH-dependent pro®le. Maximum sorption for both metals was found to occur at around pH 6±7. In the case of cork an increase of sodium chloride concentration provoked a decrease in metal removal. Adsorption isotherms at the optimum pH were expressed by the non-competitive Langmuir adsorption model, and model parameters were determined. It was seen that the adsorption equilibrium data ®tted very well to the model in the concentration range studied. When comparing both biomaterials, yohimbe bark waste was found to be the most ef®cient adsorbent for both metals studied.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

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Heavy metal uptake from aqueous solution by cork and yohimbe bark wastes

Villaescusa,

Mart�nez,

Miralles

2000

J. Chem. Technol. Biotechnol.

107

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“…A decreasing copper uptake by waste apple residues in the presence of increasing ionic strength was explained as a competitive effect of Na + ions for copper binding sites on the pomace (39). A similar explanation has been proposed to account for the observation that copper ion removal by calcium alginate decreased with increasing ionic strength (45). Others have (46) also noted the same trend while investigating the uptake of copper ion from aqueous solution using immobilized fungal biomass.…”

Section: Resultssupporting

confidence: 67%

A Heavy Metal Biotrap for Wastewater Remediation Using Poly-γ-Glutamic Acid

et al. 2006

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Poly-gamma-glutamic acid (gamma-PGA) obtained from Bacillus licheniformis ATCC 9945 was evaluated as a potential biosorbent material for use in the removal of heavy metals from aqueous solution. Copper (Cu(2+)) was chosen as the model heavy metal used in these studies since it is extensively used by electroplating and other industries, has been the model for many other similar studies, and can be easily assayed through a number of convenient methods. Cu(2+)-gamma-PGA binding parameters under varying conditions of pH, temperature, ionic strength, and in the presence of other heavy metal ions were determined for the purified biopolymer using a specially designed dialysis apparatus. Applying the Langmuir adsorption isotherm model showed that gamma-PGA had a copper capacity approaching 77.9 mg/g and a binding constant of 32 mg/L (0.5 mM) at pH 4.0 and 25 degrees C. Cu(2+)-gamma-PGA adsorption was relatively temperature independent between 7 and 40 degrees C, while an increase in ionic strength led to a decrease in metal ion binding. Cd(2+) and Zn(2+) ions compete with Cu(2+) for binding sites on the gamma-PGA biopolymer. Metal uptake by gamma-PGA was further tested using a tangential flow filtration apparatus in a diafiltration mode in which metal was continually processed through a dilute solution of gamma-PGA without allowing for equilibrium to be established. The circulating polymer solution was able to complex metal as well as successfully prevent passage of unbound copper ions present in solution through the membrane. Using 500 mL of a 0.2% gamma-PGA solution, up to 97% of a 50 mg/L copper sulfate solution processed at a flow rate of 115 mL/min was retained by the polymer. For a 10 mg/L solution of Cu(2+) as copper sulfate, filtrate concentrations of Cu(2+) never rose above 0.6 mg/L while processing 2.5 L of dilute copper sulfate.

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“…However, recovery of metal from loaded biomass is still cumbersome. Recently, plants have been studied for their ability to remove contaminants from the environment [13][14][15][16][17][18][19]. Researchers have recognized that immobilizing biomass in a granular or polymeric matrix may improve biomass performance and facilitate separation of biomass from solution [20,21].…”

Section: Introductionmentioning

confidence: 99%