The sorption of some benzene derivatives: o-xylene, toluene, phenol, benzyl alcohol, resorcinol and hydroquinone onto a zeolitic tuff-humic acid adduct (PCT-ImHA) was analysed by batch technique at 25 °C and neutral pH. PCT-ImHA was prepared by binding leonardite-extracted humic acids (HA) to a zeolitic tuff sample rich in phillipsite and chabazite and enriched with Ca by cation exchange (Ca-PCT). The HA calcium salts were gently mixed with wet Ca-PCT; then, the mixture was heated at 330 °C for 1.5 h. An adduct with almost 2% of HA was obtained. The experimental data were well fitted by the Langmuir adsorption isotherm and showed that saturation capacity (q) increased with the octanol-water repartition coefficient (K). The comparison with previous data on sorption onto immobilised HA highlights that q values for PCT-ImHA are far higher than the sum of the contributions of the two separate components.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s11356-018-1540-2 | 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 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 PDFRapid extraction of trace benzene by a crown-ether-based metal-organic framework.
Natl Sci Rev
December 2024
Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (MOE), and State Key Laboratory of Advanced Chemical Power Sources, College of Chemistry, Nankai University, Tianjin 300071, China.
Due to almost identical boiling points of benzene and cyclohexane, the extraction of trace benzene from cyclohexane is currently performed the energy-intensive extractive distillation method. Their adsorptive separation by porous materials is hampered by their similar dimensions. Metal-organic frameworks (MOFs) with versatile pore environments are capable of molecular discrimination, but the separation of trace substrates in liquid-phase remains extremely challenging.
View Article and Find Full Text PDFVertically Expanded Crystalline Porous Covalent Organic Frameworks.
J Am Chem Soc
November 2024
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City 350207, China.
Covalent organic frameworks (COFs) can be developed for molecular confinement and separation. However, their proximate π stacks limit the interlayer distance to be only 3-6 Å, which is too small for guests to enter. As a result, COFs block access to the - space and limit guest entry/exit strictly to only the pores along the direction.
View Article and Find Full Text PDFFluorinated Squareimines for Molecular Sieving of Aromatic over Aliphatic Compounds.
Angew Chem Int Ed Engl
December 2024
Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225, Düsseldorf, Germany.
The development of more energy-efficient separation technologies is essential. Especially the separation of cyclic aliphatic hydrocarbons from their aromatic counterparts remains a significant challenge due to azeotrope formation and similar physical properties, often requiring energy-intensive processes. Herein, we introduce a novel class of electron-deficient macrocycles with a unique rectangular structure to optimise interactions within the pore, enabling the highly selective molecular sieving of aromatic compounds from mixtures.
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!