scholarly journals The influence of solid-phase organic carbon on the sorption of hydrophobic organic pollutants in landfill barriers, UK

2021 ◽  
Vol 80 (11) ◽  
Author(s):  
Pin-Ru Huang ◽  
Anne Stringfellow ◽  
Dave Smallman ◽  
John Marshall
Keyword(s):  
Organic Matter ◽  
Organic Contaminants ◽  
Organic Material ◽  
Solid Phase ◽  
Liquid Extraction ◽  
Absorption Capacity ◽  
Acid Extraction ◽  
Hydrophobic Organic Contaminants ◽  
Organic Petrology ◽  
Amorphous Organic Matter

AbstractThe Oxford Clay from Bletchley, the Kimmeridge Clay from Kimmeridge Bay, Dorset, and Tertiary mud (Wittering Formation) from Whitecliff, Isle of Wight, United Kingdom were used as sorbent samples because of their distinctive organic material characteristics (Amorphous organic matter rich and/or phytoclast rich). Organic material was isolated for identification and analysis using a non-acid extraction method (heavy liquid) extraction and traditional methods involving HF digestion. These organic materials were then used to determine influences of extraction on hydrophobic organic contaminants, (toluene and naphthalene) sorption. Organic petrology classification was applied to identify the various types of isolated organic material. Amorphous organic matter from the Kimmeridge Clay displayed a higher sorption capacity (Sorption–desorption distribution coefficient (Kd), Kd = 6,481, 59, 670; for toluene and naphthalene, respectively) compared to literature values. Amorphous organic matter-rich sorbent extracts demonstrated a higher absorption capacity than the phytoclast-rich sorbents (e.g., Wittering Formation, Kd = 219, 10, 134; for toluene and naphthalene, respectively). Implications of results in landfill design/risk assessment and modelling are discussed.

The Role of Condensed Organic Matter in the Nonlinear Sorption of Hydrophobic Organic Contaminants by a Peat and Sediments

2002 ◽  
Vol 31 (6) ◽  
pp. 1953-1962 ◽  
Author(s):  
Yong Ran ◽  
Weilin Huang ◽  
P. S. C. Rao ◽  
Dehan Liu ◽  
Guoying Sheng ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Contaminants ◽  
Hydrophobic Organic Contaminants ◽  
Nonlinear Sorption

Influences of TiO2 Nanoparticles on the Transport of Hydrophobic Organic Contaminant in Soil

2014 ◽  
Vol 1010-1012 ◽  
pp. 55-68
Author(s):  
Ou Chen Cai
Keyword(s):  
Porous Media ◽  
Organic Matter ◽  
Contaminant Transport ◽  
Organic Contaminants ◽  
Organic Contaminant ◽  
Wastewater Sludge ◽  
Titania Nanoparticles ◽  
Hydrophobic Organic Contaminants ◽  
Transport In Porous Media ◽  
Subsurface Environment

As nanotechnologies become more widely used, titania nanoparticles are being released to the subsurface environment via wastewater sludge applications. Titania nanoparticles are not only toxic to organisms in the environment, but recent studies revealed that they may also serve as carriers of hydrophobic organic contaminants and affect their fate and distribution in the subsurface environment. The mobility of titania nanoparticles varies depending on nanoparticle morphology characteristics, pH and the ionic strength of solutions, flow velocity, nanoparticle concentration, and the presence of surfactant or natural organic matter. Analogous to findings for natural and engineered carbonaceous nanoparticles, titania nanoparticles may enhance the transport of hydrophobic organic contaminants in porous media. However, to prove this hypothesis, further research is necessary. Thus experiments examining the impacts of titania nanoparticle on the hydrophobic organic matter transport in porous media were designed, which consist of three different sets of column experiments. These experimental sets will investigate the effects of the presence of titania nanoparticles, the size of nanoparticles and the organic carbon content in soil, respectively. Due to the estimation of the potential for the titania nanoparticles to facilitate organic contaminant transport, the experiment results are expected as: (a) the presence of titania nanoparticles will enhance the organic contaminant transport in porous media; (b) smaller nanoparticles will adsorb more organic contaminants and enhance their transport as the result of the increasing specific surface area; (c) soil containing higher organic matter content will compete for the adsorption of organic contaminants and retard their facilitated transport by titania nanoparticles.

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