Copper adsorption by esterified and unesterified fractions of Sphagnum peat moss and its different humic substances

Gardea‐Torresdey, Jorge L.; Tang, L.; Salvador, James M.

doi:10.1016/0304-3894(95)00156-5

Cited by 157 publications

(81 citation statements)

References 8 publications

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“…Ke et al have utilized spectroscopic techniques such as Eu 3+ and UO 2 2+ luminescence for determining the functional groups responsible for metal binding by Datura innoxia (17)(18)(19)(20)(21). In addition, chemical modification techniques have also been shown to be valuable for characterizing the metal binding functional groups (11,22,23). The mechanism of metal binding by plant biomass is still not entirely understood, and further research is necessary.…”

Section: Introductionmentioning

confidence: 99%

Use of X-ray Absorption Spectroscopy and Esterification to Investigate Cr(III) and Ni(II) Ligands in Alfalfa Biomass

Tiemann

Gardea‐Torresdey

Gamez

et al. 1998

Environ. Sci. Technol.

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Previously performed studies have shown that alfalfa shoot biomass can bind an appreciable amount of nickel(II) and chromium(III) ions from aqueous solution. Direct and indirect approaches were applied to study the possible mechanisms involved in metal binding by the alfalfa biomass. The direct approach involves investigations of the metal-bound alfalfa shoot biomass by X-ray absorption spectroscopic analysis (XANES and EXAFS). Results from these studies suggest that nickel(II) and chromium(III) binding mostly occurs through coordination with oxygen ligands. Indirect approaches consist of chemical modification of carboxylate groups that have been shown to play an important role in metal binding to the alfalfa biomass. An appreciable decrease in metal binding resulted after acidic methanol esterification of the biomass, indicating that carboxyl groups are entailed in the metal binding by the alfalfa biomass. In addition, base hydrolysis of the alfalfa biomass increased the binding of these metals, which further indicates that carboxyl groups play an important role in the binding of these metal ions from solution. Therefore, by combining two different techniques, our results indicate that carboxylate groups are the major ligands responsible for the binding of nickel(II) and chromium(III) by alfalfa biomass.

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Section: Introductionmentioning

confidence: 99%

Use of X-ray Absorption Spectroscopy and Esterification to Investigate Cr(III) and Ni(II) Ligands in Alfalfa Biomass

Tiemann

Gardea‐Torresdey

Gamez

et al. 1998

Environ. Sci. Technol.

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“…Many heavy metals and their compound have been found that are toxic, while some are also subjected to biomagnifications (Viessman and Hammer, 1993;Gardea -Torresday et al 1996 andKarvelas et al 2003;). Environmental impact by heavy metals was earlier noticed to mostly connected to industrial sources (Karvelas et al 2003).…”

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confidence: 99%

Coagulation / flocculation process in the removal of trace metals present in industrial wastewater

Amuda

Amoo²,

Ipinmoroti³

et al. 2006

Journal of Applied Sciences and Environmental Management

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Attempts were made in this study to examine the effectiveness of polymer addition to coagulation process during treatment of a beverage industrial wastewater to remove some of its trace metals content such as lead, cadmium, total iron, total chromium, nickel and zinc. Experiments were conducted using the standard Jar test procedure to determine the performance of both ferric chloride and organic polymer (a non-ionic polyacrylamide) individually and ferric chloride-polymer combination. The dosages used for ferric chloride ranged from 0 to 500mg/l, whereas polymer dosages varied between 0 and 100mg/l. The (optimal) removal efficiency for total chromium in the wastewater was obtained at 300mg /l for ferric chloride and 65mg/l for polymer. Whereas for zinc and total iron, the optimal removal efficiencies were obtained at 500mg/l for ferric chloride and 65mg/l for polymer. Addition of ferric chloride resulted in significant removal of the metals reaching up to 91%, 72% and 54% of total chromium, zinc and total iron respectively while addition of polymer achieved 95%, 87% and 88% of total chromium, zinc and total iron respectively. Ferric chloride produced more voluminous and more compacted sludge than polymer. Combinations of ferric chloride and polymer at different ratio achieved better removal efficiencies of the metals in the range 84-97% for total chromium, 69-90% for zinc and 69-92% for total iron, also less sludge was produced. Lead, cadmium and nickel were not detected in the raw wastewater. @JASEM

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“…Peat moss has been used for the investigation of the absorbance efficacy of irons, such as nickel and copper, and is potentially used for purging hazardous irons from polluted water (14,15). In the biomedical field, hypersensitivity pneumonitis and chronic respiratory disorder of peat moss processing factory workers have been investigated (16,17).…”

Section: Discussionmentioning

confidence: 99%

Anti-inflammatory potential of peat moss extracts in lipopolysaccharide-stimulated RAW 264.7 macrophages

Choi

Jeong

Kim

et al. 2014

International Journal of Molecular Medicine

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Abstract. The aim of the present study was to identify the anti-inflammatory and anti-oxidative effects of peat moss aqueous extract (PME) on lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophages. To demonstrate the anti-inflammatory and antioxidant effects of PME, the levels of nitric oxide (NO) and cytokines were measured using Griess reagent and cytokine ELISA kits, respectively. Reverse transcriptase-polymerase chain reaction (RT-PCR) and western blot analysis were conducted to evaluate the expression of genes and proteins. Immunofluorescence was used to measure the expression and translocation of transcription factors. Pre-treatment with PME inhibited the production of prostaglandin E 2 and NO by suppressing the gene expression of cyclooxygenase-2 and inducible NO synthase, respectively.The LPS-stimulated gene expression and the production of tumor necrosis factor-α and interleukin-1β were significantly reduced by PME. In the LPS-stimulated RAW 264.7 cells, nuclear factor-κB (NF-κB) translocated from the cytosol to the nucleus, while pre-treatment with PME induced the sequestration of NF-κB in the cytosol through the inhibition of IκBα degradation. In the same manner, PME contributed to the inhibition of the activation of mitogen-activated protein kinases. In addition, the PME-treated RAW 264.7 cells facilitated the activation of nuclear factor-like 2 (Nrf2) , and in turn, enhanced heme oxygenase-1 (HO-1) expression. These results indicate that PME exerts anti-inflammatory and antioxidant effects, and suggest that PME may neutralize inflammation and prevent cellular damage by oxidative stress.

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Copper adsorption by esterified and unesterified fractions of Sphagnum peat moss and its different humic substances

Cited by 157 publications

References 8 publications

Use of X-ray Absorption Spectroscopy and Esterification to Investigate Cr(III) and Ni(II) Ligands in Alfalfa Biomass

Use of X-ray Absorption Spectroscopy and Esterification to Investigate Cr(III) and Ni(II) Ligands in Alfalfa Biomass

Coagulation / flocculation process in the removal of trace metals present in industrial wastewater

Anti-inflammatory potential of peat moss extracts in lipopolysaccharide-stimulated RAW 264.7 macrophages

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