Investigation of zinc(II) adsorption on Cladophora crispata in a two‐staged reactor

Özer, Dursun; Özer, Ayla; Dursun, Gülbeyi

doi:10.1002/(sici)1097-4660(200005)75:5<410::aid-jctb226>3.3.co;2-o

Cited by 8 publications

(11 citation statements)

References 10 publications

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“…in solution dropped rapidly within the time interval 5-15 min, with an apparent equilibrium being established after 30 min. Ahuja et al (1999) andÖ zer et al (2000) observed a similarly rapid physical adsorption within the initial 15 min of contact, and maintenance of that level over the time remaining. This fast disappearance of Zn ions in solution suggests that the metal removal by thermally inactivated cells occurs exclusively by adsorption onto the microalga cell surface, i.e.…”

Section: Metal Removal By Inactivated Cellsmentioning

confidence: 77%

Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus

2009

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Aquatic environments are often exposed to toxic heavy metals, which gain access to the food chain via microalgae and may cause severe problems at higher trophic levels. However, such a metabolic specificity can be taken advantage of in bioremediation strategies. The potential of a novel wild strain of Scenedesmus obliquus, previously isolated from a heavy metal-contaminated site in northern Portugal, to remove Zn from aqueous solutions was thus studied, using several initial concentrations. The removal extent reached its maximum by 1 day: 836.5 mg Zn/g biomass, at the initial concentration of 75 mg/L, mainly by adsorption onto the cell surface. Comparative studies encompassing a commercially available strain of the same microalgal species led to a maximum removal extent of only 429.6 mg Zn/g biomass, under identical conditions. Heat-inactivated cells permitted a maximum removal of 209.6 mg Zn/g biomass, at an initial concentration of 50 mg Zn/L. The maximum adsorption capacity of Zn, estimated via Langmuir's isotherm, was 330 mg Zn/g biomass. Finally, Zn removal was highest at pH 6.0-7.0. It was proven, for the first time, that such a wild microalga can uptake and adsorb Zn very efficiently, which unfolds a particularly good potential for bioremediation. Its performance is far better than similar (reference) species, especially near neutrality, and even following heat-treatment.

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Section: Metal Removal By Inactivated Cellsmentioning

confidence: 77%

Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus

2009

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“…Conversely, removal of metals by dead biomass entails only a passive process, with metal cations being predominantly adsorbed onto the functional groups on the cell surface. Surprisingly, dead biomass may, in some instances, provide a higher capacity for metal uptake than viable one 4, 66, 83. Furthermore, it entertains reversible phenomena that allow regeneration (and thus reuse) of the biomaterial in multiple sorption/desorption cycles as well as recovery of the metal removed from solution 11, 66.…”

Section: Microalga‐mediated Recovery Of Metalsmentioning

confidence: 99%

Metal uptake by microalgae: Underlying mechanisms and practical applications

Monteiro

Castro

Malcata

2012

Biotechnology Progress

307

153

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Metal contamination of a few aquatic, atmospheric, and soil ecosystems has increased ever since the industrial revolution, owing to discharge of such elements via the effluents of some industrial facilities. Their presence to excessive levels in the environment will eventually lead to serious health problems in higher animals owing to accumulation throughout the food web. Current physicochemical methods available for recovery of metal pollutants (e.g., chemical precipitation, oxidation/reduction, or physical ion exchange) are either expensive or inefficient when they are present at very low concentrations. Consequently, removal of toxic metals by microorganisms has emerged as a potentially more economical alternative. Microalgae (in terms of both living and nonliving biomass) are an example of microorganisms suitable to recover metals and able to attain noteworthy percent removals. Their relatively high metal-binding capacities arise from the intrinsic composition of their cell walls, which contain negatively charged functional groups. Consequently, microalgal cells are particularly efficient in uptake of those contaminants when at low levels. Self-defense mechanisms developed by microalgal cells to survive in metal-containing media and environmental factors that affect their removal (e.g., pH, temperature, and biomass concentration) are reviewed here in a comprehensive way and further discussed in attempts to rationalize this form of remediation vis-a-vis with conventional nonbiological alternatives.

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“…However, using them for metal removal in areas away from the sea coast may not be economically feasible. The potential of filamentous algae in removing metal ions from solution remains largely unexplored, except for a few reports (Aksu et al 1996;Ö zer et al 2000;Nuhoglu et al 2002;Mohapatra and Gupta 2005).…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metals from aqueous solution by common freshwater filamentous algae

Singh

Mehta

Gaur

2007

World J Microbiol Biotechnol

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Non-living (dried) biomass of five common filamentous algae belonging to Chlorophyta and Cyanophyta (Cyanobacteria) were screened for their metal ion sorption and removal efficiency in a batch system. A considerably higher magnitude of sorption of Pb 2+ and Cu 2+ by all the tested algae suggests the prevalence of Pb 2+ -and Cu 2+ -binding ligands in them. The Langmuir isotherm could more appropriately describe metal sorption by the test algae than the Freundlich isotherm. A 1 g l -1 biomass concentration of Pithophora odeogonia and Spirogyra neglecta, respectively removed 97 and 89% Pb 2+ in 30 min from a solution containing 5 mg l -1 initial concentration of Pb 2+ . Metal ion removal by the test algae decreased with increase in metal concentration in the solution. S. neglecta could remove >70% Pb 2+ even from a solution containing 75 mg Pb 2+ l -1 . S. neglecta and P. oedogonia could remove more than 75% of Pb 2+ and Cu 2+ from a multimetal solution, and therefore have tremendous potential for removing Pb 2+ and Cu 2+ from wastewaters containing several metal ions simultaneously. Other test algae, namely, Hydrodictyon reticulatum, Cladophora calliceima and Aulosira fertilissima were relatively less efficient in removing metal ions from solution.

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Investigation of zinc(II) adsorption on Cladophora crispata in a two‐staged reactor

Cited by 8 publications

References 10 publications

Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus

Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus

Metal uptake by microalgae: Underlying mechanisms and practical applications

Removal of heavy metals from aqueous solution by common freshwater filamentous algae

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