Characterization and activated carbon adsorption of several humic substances

McCreary, John J.; Snoeyink, Vernon L.

doi:10.1016/0043-1354(80)90231-6

Cited by 156 publications

(56 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The surface charges of the activated carbons also become positive, except for HP which has a negligible surface charge, and the adsorption of NOM subsequently increases. This effect has been seen previously by many authors (23,28,36,37). As was the case for pH 7, available pore volume is not the only factor influencing adsorption.…”

Section: Adsorption Of Nom Adsorption At Ph 7 and Phsupporting

confidence: 55%

Adsorption of NOM onto Activated Carbon: Effect of Surface Charge, Ionic Strength, and Pore Volume Distribution

Bjelopavlic¹,

Newcombe²,

Hayes

1999

Journal of Colloid and Interface Science

136

View full text Add to dashboard Cite

Section: Adsorption Of Nom Adsorption At Ph 7 and Phsupporting

confidence: 55%

Adsorption of NOM onto Activated Carbon: Effect of Surface Charge, Ionic Strength, and Pore Volume Distribution

Bjelopavlic¹,

Newcombe²,

Hayes

1999

Journal of Colloid and Interface Science

136

View full text Add to dashboard Cite

“…Ex maximum of natural DOM was shifted towards shorter wavelength with decreasing molecular weight, accompanied by an apparent increase in fluorescence efficiency (Hall and Lee, 1974;Ewald et al, 1988). The Ex/Em fluorescence intensity was reported to increase with decreasing molecular weight in soil, sedimentary and aquatic fulvic and humic substances (Levesque, 1972;Hall and Lee, 1974;McCreary and Snoeyink, 1980;Visser, 1984;Hayase and Tsubota, 1985), and natural organic ligands (Midorikawa and Tanoue, 1998). Buffle (1988) and Midorikawa and Tanoue (1998) pointed out that lower molecular mass fraction was linked to higher concentrations of carboxyl groups in freshwater.…”

Section: River Vs Lake Imac Ligandsmentioning

confidence: 99%

Fluorescence properties of organic ligands for copper(II) in Lake Biwa and its rivers.

Midorikawa

Tanoue

2001

Geochem. J.

View full text Add to dashboard Cite

Organic ligands for copper(II) were isolated from lake waters in Lake Biwa and its river waters by immobilized metal ion affinity chromatography (IMAC), and were characterized by three-dimensional excitation/emission matrix spectroscopy (3DEEM) and fluorescence quenching titration. The results show that the contribution of total organic ligands was 0.63-4.68% of the bulk dissolved organic matter (DOM), in terms of UV absorbance, in lake and river waters. Three characteristic excitation/emission (Ex/Em) fluorescence peaks were identified in organic ligands from both lake and river waters, at Ex/Em 310-330/ 374-434 nm (Peak A), 250/414-454 nm (Peak B), and 260-270/306-330 nm (Peak C). Peaks A and B were referred to as humic-like fluorescence, Peak C as protein-like fluorescence. All Ex/Em maxima of organic ligands in lake waters were shifted towards shorter wavelength, and the fluorescence intensities were higher than those in river waters. The results of fluorescence quenching titration show that the IMAC ligands were weak ligands, with conditional stability constants (logK′ CuL ) around 7.27 for river ligands, and 7.84-9.23 for lake ligands. The differences of fluorescence properties indicate the variability of fluorescent ligands between river terrestrial and lake aquatic environments. a significant role in the mobilization and transport of nutrients and pollutants (As, Zn, Cd, Pb, and Ce), and soil weathering in terrestrial ecosystems (Tegen and Dorr, 1996;Li and Shuman, 1997;Kalbitz and Wennrich, 1998). However, most previous studies have only provided concentrations and conditional stability constants of organic ligands, the fundamentals pertaining to the properties of organic ligands are poorly understood since they have never been isolated (Gordon et al., 1996; Tanoue, 1996, 1998).Immobilized metal ion affinity chromatography (IMAC) has been successfully applied to isolate organic ligands for copper(II) from estuarine, coastal and oceanic waters (Gordon, 1992; Gordon INTRODUCTIONNaturally occurring organic ligands have been extensively studied in terms of metal speciation in aquatic environments during the past decades (Tanoue and Midorikawa, 1995). In oceanic waters, copper speciation is controlled by complexation with organic ligands (Donat and Bruland, 1995). In freshwaters, there are at least three ligand classes with logK values ranging from 15 to 8.6 (Xue and Sunda, 1997), which may control the bioavailability, toxicity and speciation of copper. Organic ligands were also reported to be responsible for other trace metal speciation (e.g., Hg) in freshwater (Mantoura et al., 1978), and play 334 F. Wu et al. et al., 1996; Tanoue, 1996, 1998;Donat et al., 1997). 3DEEM and UV-VIS spectroscopy have been demonstrated to be useful methods for characterizing DOM in natural waters (Coble et al., 1990;Mopper and Schultz, 1993;Coble, 1996;Smith and Kramer, 1999;Del Castillo et al., 1999). Absorbing and fluorescing complexes such as humic substances and proteins were expected to be good candidates for organic li...

show abstract

“…The temperature is an important factor influencing adsorption. Many studies reported that the ability of adsorption increased with the decreasing temperature either for dried sludge (Zhou, 1992;Zhou and Banks, 1993) or for activated carbon (McCreary and Snoeyink, 1980). Therefore, it is hypothesized that there existed common physicochemical principles underlying these adsorption processes.…”

Section: Adsorptive Capability Of the Sludge In Cars Systemmentioning

confidence: 99%

Contact-Adsorption-Regeneration-Stabilization Process for the Treatment of Municipal Wastewater

Liu

WEl

et al. 2009

J. of Wat. & Envir. Tech.

View full text Add to dashboard Cite

In this work, the application of the contact-adsorption-regeneration-stabilization activated sludge process for the municipal wastewater treatment was investigated by using continuous experiments coupled with adsorption batch experiments. The process optimization for performance evaluation was studied. The obtained appropriate operational parameters of recycle ratio, hydraulic retention time (HRT) of the regeneration tank, HRT of the adsorption tank and solids retention time (SRT) of the system were 40%, 2 h, 30 min, and 6 d, respectively. Adsorptive kinetics and equilibrium were investigated with batch experiments of adsorption. The results showed that the activated sludge concentration was in a positive proportion to its adsorptive capability, but that temperature was in an inverse proportion to the adsorptive capability. Adsorptive equilibrium was reached within 15 min. In addition, the equilibrium data fitted well to both the Freundlich and Langmuir adsorption models.

show abstract

Characterization and activated carbon adsorption of several humic substances

Cited by 156 publications

References 11 publications

Adsorption of NOM onto Activated Carbon: Effect of Surface Charge, Ionic Strength, and Pore Volume Distribution

Adsorption of NOM onto Activated Carbon: Effect of Surface Charge, Ionic Strength, and Pore Volume Distribution

Fluorescence properties of organic ligands for copper(II) in Lake Biwa and its rivers.

Contact-Adsorption-Regeneration-Stabilization Process for the Treatment of Municipal Wastewater

Contact Info

Product

Resources

About