Contamination of soil and groundwater with BTEX compounds (benzene, toluene, ethylbenzene, and xylene) depends on the sorption behavior of these compounds by soil organic matter (SOM) and humic acids (HAs). In this study sorption of toluene by HAs extracted from lake sediment and mountain soil was investigated. HA suspensions were adjusted to pH 4.00, 6.00, or 8.00 and made to the concentration of 200 mg L(-1). Each HA suspension or solution was subjected to particle size analysis using high performance particle sizer (HPPS). The particle size of HA from lake sediment was around 1000-1200 nm while that from mountain soil was 220-320 nm at suspension pH 4.00. Kinetic studies showed that sorption of toluene by the two HAs followed pseudo-first-order and mainly pseudo-zero-order kinetics. At suspension pH 4.00, the sorption of toluene by the two HAs was best described by Langmuir and Temkin adsorption isotherm models. Further, sorption of toluene by the lake sediment HA was significantly greater than that by mountain soil HA. It was thus suggested that the lake sediment HA with larger particle size may develop beneficially chemical conformation for sorption of toluene and related compounds in soil and associated environments.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2010.01.029 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effects of copper and lead on the sorption and desorption behaviors of benzene onto humic acids and black carbons.
Water Sci Technol
November 2024
Six Geological Team of Hubei Geological Bureau, Xiaogan 432000, China; Hubei Key Laboratory of Resources and Eco-Environment Geology, Xiaogan 432000, China.
Due to rapid urbanization and industrialization, combined pollution caused by BTEX (benzene, toluene, ethylbenzene, and xylene) and heavy metals has become ubiquitous in soils, which would pose serious health risks to humans. However, the effects of heavy metals on the sorption and desorption behaviors of BTEX have not been fully elucidated. In this study, the effects of Cu and Pb ions on the sorption and desorption of benzene onto humic acids and black carbons were investigated.
View Article and Find Full Text PDFgrowth of octa-phenyl polyhedral oligomeric silsesquioxane nanocages over fluorinated graphene nanosheets: super-wetting coatings for oil and organic sorption.
Dalton Trans
November 2024
Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur-603203, Tamil Nadu, India.
Article Synopsis
- Superhydrophobic surfaces with hierarchical micro/nanostructures, like the developed O-Ph-POSS on fluorinated graphene, achieve high water contact angles (152°) and low surface energy (5.6 mJ/m²), making them highly robust and effective in water-repelling applications.
- The O-Ph-POSS-FG hybrid demonstrated remarkable oil absorption (200-500 wt%) and was successfully used to coat polyurethane sponges, achieving oil-water separation efficiencies of 90%-99%, even after multiple cycles.
- Durability tests showed that the sponges maintained superhydrophobic properties over time, retaining effective water contact angles and separation efficiency after one year and multiple mechanical stress tests.
The Synthesis of a Large Stokes-Shift Dye and Intercalation into the Nanochannels of Zeolite L.
Materials (Basel)
November 2024
Institute of Chemistry and Biotechnology, ZHAW Zurich University of Applied Sciences, CH-8820 Wädenswil, Switzerland.
A host-guest-based fluorescent composite with a large Stokes shift was synthesized by intercalating 2,2'-(thiophene-2,5-diyl)bis(benzo[d]oxazol-6-amine) (BBTA) into the nanochannels of zeolite L (ZL) and sealing the pores with (3-aminopropyl)triethoxysilane (APTES). To confirm the orientation of the amino groups in BBTA, a single crystal of 2,5-bis(6-nitrobenzo[d]oxazol-2-yl)thiophene (BBTN) was grown and examined by X-ray crystallography. The evidence of successful intercalation of BBTA into the nanochannels of ZL was provided by fluorescence spectrometry, gas sorption and fluorescence microscopy.
View Article and Find Full Text PDFUniversal carbon nanotubes-polybenzimidazole SPME coating and its application for both gas and liquid chromatography.
Analyst
December 2024
Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
In this study, we present a novel combination of carbon nanotubes (CNT), widely used as a sorbent material in solid-phase extraction-based methodologies, with polybenzimidazole (PBI), recently introduced as a universal binder for physical immobilization of sorbent particles. This combination was used to prepare CNT-PBI coated solid-phase microextraction (SPME) devices (fibers, arrows, and blades) suitable for both thermal and solvent desorption. The resulting CNT-PBI SPME devices presented excellent mechanical resistance and high thermal stability, capable of enduring multiple thermal desorption cycles without compromising extraction efficiency.
View Article and Find Full Text PDFFactors that influence the migration of sorbed pesticides in polyethylene and biodegradable mesoplastics.
Environ Pollut
January 2025
Instituto de Ciencias, Universidad Nacional de General Sarmiento (UNGS), J. M. Gutiérrez 1150, (B1613GSX) Los Polvorines, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Electronic address:
Trifluralin, Chlorpyrifos, and Procymidone migration performance from polyethylene (PE) and biodegradable (Mater-Bi: M-B) mulching films was examined. Desorption of pesticides from PE and M-B was studied using soil-plastic microcosms, considering temperature, soil humidity, and mulching film type as experimental variables. Trifluralin and Chlorpyrifos desorption was higher for PE than for M-B under all experimental conditions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!