Heavy Metals: Toxicity and Removal by Biosorption

Mudhoo, Ackmez; Garg, V.K.; Wang, Shaobin

doi:10.1007/978-94-007-2439-6_10

Cited by 25 publications

(14 citation statements)

References 227 publications

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“…In the present work, the effect of five transition metals on UV sensitivity and UV-induced cellular damage on a set of bacterial isolates was studied. The concentrations of metals used were generally in agreement with reported environmental concentrations in aquatic systems, particularly in the runoff of urban areas (36). The importance of metals to UV-B-induced damage was evident from the shift in the descriptors that contributed the most to explain bacterial inactivation (expressed as LD 50 ) following treatment with different metals, as revealed by linear regression.…”

Section: Discussionsupporting

confidence: 78%

Role of Transition Metals in UV‐B‐Induced Damage to Bacteria

Santos

Gomes

Henriques

et al. 2013

Photochem & Photobiology

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The purpose of this study was to explore the possible link between metals and UV-B-induced damage in bacteria. The effect of growth in the presence of enhanced concentrations of different transition metals (Co, Cu, Fe, Mn and Zn) on the UV-B sensitivity of a set of bacterial isolates was explored in terms of survival, activity and oxidative stress biomarkers (ROS generation, damage to DNA, lipid and proteins and activity of antioxidant enzymes). Metal amendment, particularly Fe, Cu and Mn, enhanced bacterial inactivation during irradiation by up to 35.8%. Amendment with Fe increased ROS generation during irradiation by 1.2-13.3%, DNA damage by 10.8-37.4% and lipid oxidative damage by 9.6-68.7%. Lipid damage during irradiation also increased after incubation with Cu and Co by up to 66.8% and 56.5% respectively. Mn amendment decreased protein carbonylation during irradiation by up to 44.2%. These results suggest a role of Fe, Co, Cu and Mn in UV-B-induced bacterial inactivation and the importance of metal homeostasis to limit the detrimental effects of ROS generated during irradiation.

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Section: Discussionsupporting

confidence: 78%

Role of Transition Metals in UV‐B‐Induced Damage to Bacteria

Santos

Gomes

Henriques

et al. 2013

Photochem & Photobiology

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“…The equation of Lagergren's pseudo-fi rst order 9 after integration takes a rectilinear form: (2) where q e and q t (mg/g) are the amounts of metal ions sorbed at equilibrium time (mg/g) and t (min), respectively, and k 1 is the rate constant of the equation (l/min). The sorption rate constants (k 1 ) can be determined experimentally by plotting ln(q e -q t ) vs. t.…”

Section: Biosorption Kineticsmentioning

confidence: 99%

“…At a low pH, cell wall ligands were closely associated with hydronium ions H 3 O + and restricted the approach of metal cations as a result of the repulsive force 3 . A decrease in biosorption yield at a higher pH (pH>6) is related to the formation of soluble hydroxylated complexes of metal ions (nickel ions in the form of Ni(OH) 2 , zinc ions in the form of Zn(OH) 2 ) 23 . Similar conclusions were presented by many authors conducting research on the biosorption of nickel and zinc ions using different biosorbents 20, 22, 25 .…”

Section: Eff Ect Of Contact Time and Temperaturementioning

confidence: 99%

Biosorption of nickel (II) and zinc (II) from aqueous solutions by the biomass of yeast Yarrowia lipolytica

Wierzba

2017

Polish Journal of Chemical Technology

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This study examined the biosorption process of Ni(II) and Zn(II) from an aqueous solution by dead biomass of Yarrowia lipolytica. Optimum biosorption conditions were determined as a function of pH, biomass dosage, contact time, and temperature. The biosorbent was characterized by FTIR, which indicated the participation of hydroxyl, carboxyl, amide and amine groups in the process of binding the metal ions. The results showed that the biosorption processes of both metal ions closely followed pseudo-second order kinetics. The equilibrium data of Ni(II) and Zn(II) ions at 20, 30 and 40 o C fi tted the Langmuir and Freundlich isotherm models. Langmuir isotherm provided a better fi t to the equilibrium data, with a maximum biosorption capacity of the Y. lipolytica biomass for Ni(II) and Zn(II) of 30.12 and 44.44 mg/g respectively. The calculated thermodynamic parameters demonstrated that the biosorption of Ni(II) and Zn(II) ions onto the Y. lipolytica was feasible, spontaneous and endothermic.

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“…Due to biomagnification and accumulation via the food chain, there is an increasing risk of heavy metal contamination in aquatic products, causing significant threats to human health . Since heavy metals are not biodegradable , the removal of heavy metals should be taken into consideration first before using the food materials contaminated by heavy metals, e.g., enzymatic hydrolysate of aquatic product. Conventional physiochemical methods for heavy metal removal, such as chemical precipitation, adsorption method, and ion exchange, are ineffective in food environment for low concentrations of heavy metals and high concentrations of organic compounds .…”

Section: Introductionmentioning

confidence: 99%

Different effects of sodium chloride preincubation on cadmium tolerance of Pichia kudriavzevii and Saccharomyces cerevisiae

Dong

et al. 2015

J. Basic Microbiol.

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Application of growing microorganisms for cadmium removal is restricted by high cadmium toxicity. The effects of sodium chloride (NaCl) preincubation on the cadmium tolerance and removal ability of Pichia kudriavzevii and Saccharomyces cerevisiae were investigated in this study. NaCl preincubation improved the biomass of P. kudriavzevii under cadmium stress, while no obvious effect was observed in S. cerevisiae. The improved activities of peroxidase (POD) and catalase (CAT) after NaCl preincubation might be an important reason for the decrease of the reactive oxygen species (ROS) accumulation, cell death, and oxidative damage of proteins and lipids induced by cadmium, contributing to the improvement of the yeast growth. The cadmium bioaccumulation capacity of P. kudriavzevii decreased significantly after NaCl preincubation, which played an important role in mitigating the cadmium toxicity to the yeast. The cadmium removal rate of P. kudriavzevii was obviously higher than S. cerevisiae and was significantly enhanced after NaCl preincubation. The results suggested that NaCl preincubation improved the cadmium tolerance and removal ability of P. kudriavzevii.

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Heavy Metals: Toxicity and Removal by Biosorption

Cited by 25 publications

References 227 publications

Role of Transition Metals in UV‐B‐Induced Damage to Bacteria

Role of Transition Metals in UV‐B‐Induced Damage to Bacteria

Biosorption of nickel (II) and zinc (II) from aqueous solutions by the biomass of yeast Yarrowia lipolytica

Different effects of sodium chloride preincubation on cadmium tolerance of Pichia kudriavzevii and Saccharomyces cerevisiae

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