Effect of Heavy Metals on the Sorption of Hydrophobic Organic Compounds to Wood Charcoal

Chen, Junyi; Zhu, Dongqiang; Sun, Chuang

doi:10.1021/es062113+

Cited by 176 publications

(112 citation statements)

References 30 publications

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“…It is generally recognized that hydration reactions become more important if hydrated metals and adsorbent micropores have comparable sizes (12). As an example, the micropore and mesopore data for ash (SI Figure S7) indicated that micropores of 2.5-15 Å account for 65.6% of cumulative micropore and mesopore volumes.…”

Section: Nmr Spectra and Elementalmentioning

confidence: 99%

Effects of Copper, Lead, and Cadmium on the Sorption of 2,4,6-Trichlorophenol Onto and Desorption from Wheat Ash and Two Commercial Humic Acids

Wang

Shan

Feng

et al. 2009

Environ. Sci. Technol.

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The effects of copper (Cu 2+ ), lead (Pb 2+ ), and cadmium (Cd 2+ ) on the sorption of 2,4,6-trichlorophenol (TCP) to and desorption from wheat ash and two commercial humic acids were studied. Copper and Pb 2+ diminished the sorption of TCP onto all adsorbents, and made desorption of TCP less hysteretic from ash and German humic acids (GeHA), but more hysteretic from Tianjin humic acids (TJHA). Cadmium had little effect on TCP sorption and desorption. Fourier-transform infra red (FTIR) and X-ray absorption spectroscopy (XAS) in conjunction with fluorescence quenching studies provided insights into the mechanisms of TCP sorption and desorption as affected by Cu 2+ and Pb 2+ , indicating that complexation of Cu 2+ and Pb 2+ was likely via carboxylic, hydroxylic and phenolic groups of ash, TJHA and GeHA, and that theses same functional groups also reacted with TCP during sorption. In contrast, Cd, a "soft acid", had no effect on the adsorption of TCP. Hydration shells of dense water around adsorbed Cu 2+ and Pb 2+ ions may also compete with TCP for available surface area. Fluorescence quenching of pyrene verified that for TJHA, Cu 2+ and Pb 2+ promoted the formation of supramolecular associations with interior hydrophobic regions separated from aqueous surroundings by exterior hydrophilic layers.

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Section: Nmr Spectra and Elementalmentioning

confidence: 99%

Effects of Copper, Lead, and Cadmium on the Sorption of 2,4,6-Trichlorophenol Onto and Desorption from Wheat Ash and Two Commercial Humic Acids

Wang

Shan

Feng

et al. 2009

Environ. Sci. Technol.

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“…For example, several workers have suggested that heavy metals can enhance or inhibit the sorption of HOCs to carbonaceous materials depending on the composition and structure of the sorbents (7,8). Combined contamination by heavy metals and organic contaminants often occurs in the soil environment (9,10).…”

Section: Introductionmentioning

confidence: 99%

New Insights into the Influence of Heavy Metals on Phenanthrene Sorption in Soils

Luo

Zhang

Christie

2010

Environ. Sci. Technol.

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Soil contamination by combinations of heavy metals and organic contaminants has become an increasingly important environmental issue. Effects of heavy metal cations (Cu 2+ , Ni 2+ , and Pb 2+ ) on phenanthrene sorption were systematically investigated using two soils with contrasting physicochemical properties. Spectral and microscopic analyses provide direct evidence for the modification of composition and conformation of dissolved organic carbon (DOC) and hydrophobicity of the interfaces in the presence of metal cations. Parts of rubbery organic carbon (including flexible DOC and humic acids) became condensed on solid surfaces in the presence of heavy metals as evidenced by an increase in the glass transition temperature of the soils. These modifications led to a significant increase in the capacity and nonlinearity of phenanthrene sorption in the soils. As the added metal cations aged for 70 days, the soil solution gradually recovered its original physicochemical properties, and the facilitating effects of the heavy metals on phenanthrene sorption were significantly attenuated. This work highlights the important implications of DOC properties and aging processes of metals in the sorption of hydrophobic organic compounds (HOCs) such as phenanthrene in soils and provides compelling evidence for the facilitating effects of heavy metals on HOC sorption in soils.

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Section: Resultsmentioning

confidence: 99%

“…Ag + is highly polarizable and can bind with aromatic organic compounds containing π-electrons (Chen et al 2007), resulting in further elevated TCP adsorption by ash. In addition, Ag + has one positive charge and a larger ionic radius than Zn 2+ and Al 3+ ; hence, it is relatively easier for Ag + to replace the metal ions (mainly solonetz metal ions such as Na + and Ca 2+ ) originally on ash through outer layer complexation reactions (Chen et al 2007). This will lead to further reduction in the solubility of functional groups on the ash surface and also compress the hydrated ionic radius of these metal ions, thereby reducing the competitive adsorption of water molecules on the ash surface and increasing the adsorption of TCP.…”

Section: Resultsmentioning

confidence: 99%

“…It is common in many contaminated sites to find a complex suite of organic chemicals and inorganic elements in existence together (Sprovieri et al 2007), and the coexistence of metal ions affects the adsorption of organic contaminants to charcoal, ash, and carbon nanotubes (Chen et al 2007Wang et al 2009Wang et al , 2011. Chen et al (2007) found that Cu 2+ decreases the adsorption of 2,4-dichlorophenol, 1,2-dichlorobenzene, and naphthalene by 30-60 %, while Ag + increases adsorption of these solutes by wood charcoal. Wang et al (2011) suggested that Cu 2+ , Pb 2+ , and Zn 2+ diminish p-nitrophenol adsorption on ash, while increasing its desorption remarkably.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption and desorption of 2,4,6-trichlorophenol onto and from ash as affected by Ag+, Zn2+, and Al3+

Chen

Wang

Pei

2013

Environ Sci Pollut Res

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Metal cations and organic pollutants mostly co-exist in the natural environment. However, their interactions in adsorption processes have yet to be adequately addressed. In the current study, the effect of inorganic cations with different charges (Ag + , Zn 2+ , and Al 3+ ) on the adsorption and desorption of 2,4,6-trichlorophenol (TCP) onto and from processed ash derived from wheat (Triticum aestivum L.) straw was investigated. The adsorption and desorption of TCP were both nonlinear; the isotherm and kinetics curves fitted well using the Freundlich equation and a pseudo-second-order model, respectively. The presence of Ag + promoted TCP adsorption, while Zn 2+ and Al 3+ reduced TCP adsorption onto ash. The desorption of TCP from ash showed obvious hysteresis, and the presence of Ag + , Zn 2+ , and Al 3+ caused the desorption to be less hysteretic. The suppression of TCP adsorption by Zn 2+ and Al 3+ was ascribed to the partial overlapping of adsorption groups between TCP and metal ions. Al 3+ had a stronger inhibition effect than that of Zn 2+ due to its higher binding capacity and larger hydrated ionic radius than those of Zn 2+ . Enhanced adsorption of TCP onto ash by Ag + was ascribed to its ability to reduce the competitive adsorption of water molecules on ash surface by replacing the original ions, such as Na + and Ca 2+ , and compressing the hydrated ionic radius of these metal ions. In addition, Ag + was able to bind with the aromatic organic compounds containing π-electrons, which resulted in a further increase of TCP adsorption by ash.

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Effect of Heavy Metals on the Sorption of Hydrophobic Organic Compounds to Wood Charcoal

Cited by 176 publications

References 30 publications

Effects of Copper, Lead, and Cadmium on the Sorption of 2,4,6-Trichlorophenol Onto and Desorption from Wheat Ash and Two Commercial Humic Acids

Effects of Copper, Lead, and Cadmium on the Sorption of 2,4,6-Trichlorophenol Onto and Desorption from Wheat Ash and Two Commercial Humic Acids

New Insights into the Influence of Heavy Metals on Phenanthrene Sorption in Soils

Adsorption and desorption of 2,4,6-trichlorophenol onto and from ash as affected by Ag+, Zn2+, and Al3+

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