Affinity For Volatile Organic Compounds Research Articles

Synthesis, crystal structure, and optical properties of fluorinated poly(pyrazole) ligands andin silicoassessment of their affinity for volatile organic compounds

Increasing fluorination of an organic ligand forming porous coordination polymers results in enhanced affinity for volatile organic compounds (VOCs) without affecting the fluorescence properties, thus opening new perspectives for VOC sensing.

Correction: Synthesis, crystal structure, and optical properties of fluorinated poly(pyrazole) ligands and in silico assessment of their affinity for volatile organic compounds

Correction for ‘Synthesis, crystal structure, and optical properties of fluorinated poly(pyrazole) ligands and in silico assessment of their affinity for volatile organic compounds’ by Alessandro Pedrini et al., New J. Chem., 2020, 44, 6443–6455, DOI: 10.1039/D0NJ00259C.

A novel triazine‒bearing calix[4]arene: Design, synthesis and gas sensing affinity for volatile organic compounds

A novel triazine-calix[4]arene conjugate was designed and synthesized with the aim to study gas sensing against volatile organic compounds (VOCs) such as dichloromethane, chloroform and carbon tetrachloride. This novel compound was fully characterized by spectroscopic techniques such as FTIR, 1H and 13C NMR along with HRMS and BET analysis. The triazine based calix[4]arene organic materials were fabricated onto quartz glasses and quartz crystal substrates to form a thin film chemical sensor element by using Langmuir-Blodgett (LB) technique. Quartz Crystal Microbalance, UV–Visible Spectroscopy, Atomic Force Microscopy and Scanning Electron Microscopy techniques were employed to characterize all these LB thin film layers. Fick's Equations were used for analyzing the swelling process of LB thin film sensor and diffusion coefficient values of organic vapours for swelling were obtained. The initial experiments have revealed that new triazine appended calix[4]arene derivative exhibited an effective chemical gas sensor characteristic with a large response to dichloromethane vapour.

Modeling Liquid–Liquid Equilibria of Polyimide Solutions

The mutual affinity of volatile organic compounds (VOCs) and the active polymer layer of dense organic solvent nanofiltration (OSN) membranes is an important property that influences the separation efficiency. Therefore, the affinity between active layer materials and VOCs was investigated by measuring the liquid–liquid equilibria (LLE) between neat polymers used as active layer materials and VOCs. The measured phase equilibria are modeled using the thermodynamic PC-SAFT (perturbed chain statistical associating fluid theory) model. This model allows for estimation of the pressure- and temperature-dependent chemical potentials of VOCs and membrane materials in feeds, membranes, and permeates. Two polyimides (P84 and Matrimid 5218) were selected as typical OSN membrane materials, and five different VOCs (n-hexane, ethyl acetate, 2-propanol, ethanol, and toluene) were considered. It was found that all miscibility gaps between the polyimides and VOCs are open miscibility gaps. The miscibility gaps of Matrimid...

Synthesis of polymeric microparticles for water purification

In the present study, highly crosslinked poly(styrene/meta-diisopropylbenzene) P(St/mDIB) microparticles were prepared employing both an emulsifier-free emulsion polymerization and a single-step swelling polymerization process. The effect of the crosslinker concentration on the particle size and morphology was examined experimentally. Polystyrene microparticles were also prepared by emulsion polymerization in the presence of β-cyclodextrin, P(St/β-CD). The ability of the synthesized polymeric microparticles to adsorb various organic pollutants (e.g., styrene, trihalomethanes and chlorinated volatile organic compounds) from aqueous solutions was examined by gas chromatography (GC). It was shown that the particles exhibit a moderate affinity for styrene, a low affinity for trihalomethanes and a high affinity for volatile organic compounds (VOCs), higher than that of activated carbon (AC). The polymeric microparticles were subsequently impregnated into ceramic, SiC/TiO 2 and Al 2O 3, filters. The hybrid filters were used for the purification of potable water and their adsorption capacity was examined by high performance liquid chromatography (HPLC). It was shown that a SiC/TiO 2 filter, impregnated with P(St/mDIB) microparticles, exhibits increased adsorption efficiency as compared to the empty ceramic filter.