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Sunday, July 19, 2020 | History

2 edition of Sorption properties of model compounds on C 18 adsorbents found in the catalog.

Sorption properties of model compounds on C 18 adsorbents

Harold F. Walton

Sorption properties of model compounds on C 18 adsorbents

by Harold F. Walton

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  • 37 Currently reading

Published by U.S. Environmental Protection Agency, Health Effects Research Laboratory in Research Triangle Park, NC .
Written in English

    Subjects:
  • Sewage -- Purification -- Adsorption,
  • Adsorption (Biology)

  • Edition Notes

    StatementHarold F. Walton
    ContributionsHealth Effects Research Laboratory (Research Triangle Park, N.C.)
    The Physical Object
    Pagination6 p. :
    ID Numbers
    Open LibraryOL14890472M

    Evidence is accumulating that sorption of organic chemicals to soils and sediments can be described by “dual-mode sorption”: absorption in amorphous organic matter (AOM) and adsorption to carbonaceous materials such as black carbon (BC), coal, and kerogen, collectively termed “carbonaceous geosorbents” (CG). Median BC contents as a fraction of total organic Cited by: The adsorbents used in the experiments were GAC with two different sizes ( and mm). Further-more, Aniline (A), Benzaldehyde (B), and Benzoic Acid (BA) were used as adsorbates. All of used sub-stances were purchased from Merck Company, Lindenplatz, Germany. The properties of solutes and GAC are presented in Tab. 1 and Tab. 2. Table Size: KB.

    Poly(ethyleneimine) (PEI) was modified to investigate the effect of amine type and introduced hydroxy groups on its ability to capture CO were impregnated in as-synthesized mesostructured silica (MSU-F) to fabricate solid amines, Cited by: 6. Quantitative structure-activity relationships for evaluating the influence of sorbate structure on sorption of organic compounds by soil.

    Sorption properties of activated carbon derived from used paper and of amorphous 2OSiO 2 from paper sludge ash K. Okada1, V. K. Jha1, Y. Kameshima1, A. Nakajima1 & K. J. D. MacKenzie2 1Department of Metallurgy and Ceramics Science, Tokyo Institute of . The Solution: Carbon-Based Adsorbents. Carbon-based adsorbents offer more choices for sampling atmospheres containing VOCs. These graphitized carbons and carbon molecular sieves are hydrophobic, effi ciently release the compounds of interest during the desorption process, allow a broader spectrum of analytes to be collected, and exhibit lower background levels than .


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Sorption properties of model compounds on C 18 adsorbents by Harold F. Walton Download PDF EPUB FB2

Get this from a library. Sorption properties of model compounds on C 18 adsorbents. [Harold F Walton; Health Effects Research Laboratory (Research Triangle Park, N.C.)].

The complete report, entitled "Sorption Properties of Model Compounds on Ci8 Adsorbents, "(Order No. PB ; Cost: $, subject to change) will be available only from: National Technical Information Service Port Royal Road Springfield, VA Telephone: The EPA Project Officer can be contacted at: Health Effects.

Chars from wildfires and soil amendments (biochars) are strong adsorbents that can impact the fate of organic compounds in soil, yet the effects of. Sorption is quantified by measuring a sorption isotherm, which is simply a description of the relationship between the concentration of contaminant in the sorbed state and the concentration in the aqueous phase (or air for vapor-phase sorption).

Many different forms of isotherms have been proposed and used to describe sorption. The simplest is the Linear Isotherm (the same. Sorption of Agrochemical Model Compounds by Sorbent Materials Containing β-cyclodextrin Article (PDF Available) in Journal of Agromedicine 15(2) April with 75 Reads.

MODELING AND PREDICTION OF SPECIFIC COMPOUND ADSORPTION BY ACTIVATED CARBON AND SYNTHETIC ADSORBENTS B.

VAN VLIET 1, W. WEBER JR 2 and H. Hozu~n 3 1National Institute for Water Research, Pretoria, Republic of South Africa, 2Environmental and Water Resources Engineering, The University of Michigan. new, improved model.

This new model demonstrates the importance of adding descriptors for the specific interaction with the carbon surface to the size and shape descriptors. The adsorption capacities of the same eight organic compounds at low relative pressures were correlated with compound Size: KB.

Adsorbent valorization is performed by light solvent washing, followed by drying and calcination at °C depending on the properties of the adsorbent. The IFP experimented with waste oil percolation on clay in the s. The oil was pre-clarified with propane and then finished on clay. The operating conditions were as follows: •.

Polymeric sorbent materials that incorporate β-cyclodextrin (CD) have been prepared and their sorption behavior toward two model agrochemical contaminant compounds, p-nitrophenol (PNP) and methyl chloride examined.

The sorption of PNP was studied in aqueous solution using ultraviolet-visible (UV-Vis) spectroscopy, whereas the sorption of methyl chloride from the gas Cited by: 8. A discussion of the adsorption of inorganics from aqueous solution on inorganic adsorbents.

It emphasizes the relationship between adsorption and surface charging, highlighting simple and complex adsorption systems sorted by the adsorbent as well as the adsorbate. The author includes a comprehensive collection of pristine PZC of different materials - covering /5(2).

Afterwards, to evaluate sorption properties of the prepared adsorbents towards phenols, ibuprofen and salicylic acid the solid phase extraction (SPE) experiments were performed. The polymers had the specific surface areas of about – m 2 /g created mainly by mesopores with widths ca.

and – : Magdalena Sobiesiak, Marta Grochowicz, Joanna Osypiuk Tomasik. Carbonaceous adsorbents produced from mixtures of novolac resin and olive stone biomass in various proportions were investigated with respect to their ability to adsorb toluene and cyclohexane from the vapour phase.

The adsorption of toluene on all adsorbents was found to be higher than that of cyclohexane. The overall diffusion coefficient, D, of the Cited by: 1. Adsorption properties of carbon and carbonsilica adsorbents, prepared by n-octanol and glucose pyrolysis and catalytic decomposition of n-butane, have been studied regarding their applicability for the extraction and concentration of phenol, its nitro- and chloroderivatives and trihalomethanes [THM] from aqueous solutions in the concentration Cited by: This is part of a larger study that addresses the question of whether site-specific sorption of organic compounds takes place in soil organic matter (SOM).

Competitive sorption is one indication that such interactions may take place. Competitive sorption was tested between atrazine (AT) and other co-solutes in water suspensions of natural and model sorbents. Recent efforts have been directed towards the design of efficient and contaminant selective remediation technology for the removal of perfluorinated compounds (PFCs) from soils, sediments, and aquatic environments.

While there is a general consensus on adsorption-based processes as the most suitable methodology for the removal of PFCs from aquatic Cited by: Sorption of heavy metals with natural modified adsorbents A number of natural adsorbents have been used in the last decade to treat water polluted with heavy metals.

Bentonite, zeolites, plant debris, etc []. Some of them were modified to improve their sorption capacity. Such modifications depended. Layered double hydroxides (LDHs) are lamellar ionic compounds containing a positively charged layer and exchangeable anions in the interlayer.

In this study, LDHs intercalated with chelating agents were synthesized by anion exchange reaction. The materials synthesized in this work were characterized by chemical analysis, Fourier transform infrared spectroscopy (FT-IR), scanning Author: Naoki Kano, Shuang Zhang.

Cyclophosphazene-based inorganic–organic hybrid nanoporous materials (CHNMs) have been synthesized by a facile solvothermal method. The condensation of pyrrole with the reaction product of phosphonitrilic chloride trimer and 4-hydroxybenzaldehyde resulted in the formation of high-surface-area CHNMs.

The nanocomposite with better sorption properties was additionally modified with graphene-like MoS2, nanoparticles of which had the following characteristics: average dimensions d[] =(2) nm, d[ ] = (6) nm; unit cell parameters a = (1) nm, c = (1) nm; and the estimated average number of S-Mo-S nanolayers n~4 [26].

@article{osti_, title = {Effect of calcination temperature of alumina on the adsorption/impregnation of Pd(II) compounds}, author = {Sivaraj, C. and Contescu, C. and Schwarz, J.A.}, abstractNote = {A series of alumina supports derived from a common source material was subjected to a range of calcination temperatures and the results of this treatment.

Phenolic compounds are important industrial wastes, and are classified as hazardous substances contaminating groundwater resources.

Therefore, the removal or diminish of these organics compounds in order to reach the permitted levels before discharging becomes a challenging. Several processes have been developed to remove phenolic compounds from waters, Cited by: 3.Common Amino Compounds used in Covalent Grafting Methods.

17 Comparison of Post-modification and Co-condensation Using a Mono Amine. 18 The Correlation between Surface Area and Adsorption Capacity. 20 Trend of the Amine Density to CO 2 Adsorption per unit Area of Multiple.The suitability of the investigated adsorbents for CO 2-removal by adsorption was classified with the help of the obtained experimental data.

It can be shown, that an evaluation of the separation performance of such materials, based only on textural parameters like the BET surface area or N 2 -isotherms at 77 K is limited in its confidence and.