Biosorption properties of extracellular polymeric substances (EPS) towards Cd, Cu and Pb for different pH values

Comte, Sophie; Guibaud, Gilles; Baudu, Michel

doi:10.1016/j.jhazmat.2007.05.070

Cited by 264 publications

(101 citation statements)

References 34 publications

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“…Among the various reactive compounds associated with bacterial cell walls, the extracellular polymeric substances are of particular importance and are well known to have significant effects on acid-base properties and metal adsorption [55]. Studies on the metal binding behavior of extracellular polymeric substances (EPS) revealed a great ability to complex heavy metals through various mechanisms, which include proton exchange and micro-precipitation of metals [56,57]. Recent studies have characterized and quantified the proton and adsorbed metals on bacterial cells and EPS free cells in order to determine the relative importance of EPS molecules in metal removal [58].…”

Section: Bioremediation By Adsorptionmentioning

confidence: 99%

Bioremediation of Heavy Metals from Soil and Aquatic Environment: An Overview of Principles and Criteria of Fundamental Processes

et al. 2015

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Heavy metals are natural constituents of the environment, but indiscriminate use for human purposes has altered their geochemical cycles and biochemical balance. This results in excess release of heavy metals such as cadmium, copper, lead, nickel, zinc etc. into natural resources like the soil and aquatic environments. Prolonged exposure and higher accumulation of such heavy metals can have deleterious health effects on human life and aquatic biota. The role of microorganisms and plants in biotransformation of heavy metals into nontoxic forms is well-documented, and understanding the molecular mechanism of metal accumulation has numerous biotechnological implications for bioremediation of OPEN ACCESSSustainability 2015, 7 2190 metal-contaminated sites. In view of this, the present review investigates the abilities of microorganisms and plants in terms of tolerance and degradation of heavy metals. Also, advances in bioremediation technologies and strategies to explore these immense and valuable biological resources for bioremediation are discussed. An assessment of the current status of technology deployment and suggestions for future bioremediation research has also been included. Finally, there is a discussion of the genetic and molecular basis of metal tolerance in microbes, with special reference to the genomics of heavy metal accumulator plants and the identification of functional genes involved in tolerance and detoxification.

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Section: Bioremediation By Adsorptionmentioning

confidence: 99%

Bioremediation of Heavy Metals from Soil and Aquatic Environment: An Overview of Principles and Criteria of Fundamental Processes

et al. 2015

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“…EPS, which are secreted in part by microorganisms during growth, consist of various organic substances such as polysaccharides, uronic acids, proteins, nucleic acids, and lipids. It has been suggested that the mechanism of sorption is based on exchange reactions, complexation with negatively charged groups, adsorption, and precipitation [10][11][12] . Exposure to heavy metals has however been reported to cause a change in the composition (monitored through biomass C/P ratio) of extracellular polymeric substances 13 .…”

Section: Introductionmentioning

confidence: 99%

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Ong¹,

Toorisaka²,

Hirata³

et al. 2010

ScienceAsia

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The adsorption of Cu, Cd, Ni, Zn, and Cr from synthetic solutions on powdered activated carbon (PAC), activated sludge, and dried sludge were investigated under laboratory conditions to assess its ability to remove heavy metals. The adsorption efficiency increased rapidly within the first 30 min and then slowed down as it approached a steady state after 5 h of contact time. The results showed that activated sludge and PAC had a higher adsorption capacity than dried sludge. However, PAC showed a better adsorption capacity for Cu, Zn, and Ni than activated sludge. The maximum adsorption capacity, as quantified by the Langmuir parameter Q for activated sludge was 44, 30, 24, 23, and 18 mg/g for Cu, Ni, Cd, Cr, and Zn, respectively. In the case of dried sludge, the respective values of Q were 20, 13, 11, 3, and 10 mg/g. The acute toxicity of these five heavy metals to the activated sludge microorganisms was determined on the basis of the reduction in the specific oxygen uptake rate (SOUR). The results obtained from the SOUR measurements indicated a decreasing toxicity scale, Cu > Cd > Ni Cr > Zn on activated sludge microorganisms.

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“…The final pH of heavy metal working solution after adsorption was in the range of 5.9 -6.3 (results are not given). According to previous study [22], at the pH range of 6, Pb 2+ accounts for about 98.6% of total lead, Cd 2+ and Ni 2+ accounts for 100% of total cadmium and total nickel, respectively. Thus, the precipitation of heavy metal ions can be neglected in the adsorption process.…”

Section: Adsorption Isotherms Of Alkali Treated Sewage Sludgementioning

confidence: 70%

Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

Beijing¹

2015

GEP

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Sewage sludge is the promising raw material for biosorbent preparation. In this work, we evaluated the heavy metals adsorption characteristics of alkali treated sewage sludge (ATSS) by equilibrium studies. The adsorption isotherms were fitted with Langmuir and Freundlich models. Comparing with untreated sewage sludge, the total adsorption capacity (qm) of ATSS (prepared with 0.125 mol/L NaOH) for Cd, Pb, Ni, increased by 0.51, 0.70 and 0.32 mmol/g, respectively. When the NaOH concentration for ATSS preparation increased from 0.125 mol/L to 0.25 mol/L, the qm of ATSS for Pb decreased from 1.05 mmol/g to 0.84 mmol/g. However, when the NaOH concentration increased from 0.25 mol/L to 7.5 mol/L, it showed increasing trend. According to the IR spectra data, the adsorption effect of biosorbent for heavy metals was mainly due to the complexation of -N-H groups and -COOH groups.

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Biosorption properties of extracellular polymeric substances (EPS) towards Cd, Cu and Pb for different pH values

Cited by 264 publications

References 34 publications

Bioremediation of Heavy Metals from Soil and Aquatic Environment: An Overview of Principles and Criteria of Fundamental Processes

Bioremediation of Heavy Metals from Soil and Aquatic Environment: An Overview of Principles and Criteria of Fundamental Processes

Untitled

Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

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