Pyrone-Like Structures as Novel Oxygen-Based Organic Superbases

Suárez, Dimas; Menéndez, J.Á.; Fuente, E.; Montes-Morán, Miguel A.

doi:10.1002/(sici)1521-3757(20000403)112:7<1376::aid-ange1376>3.0.co;2-r

Cited by 6 publications

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References 32 publications

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“…Due to the capability of the carboxamide group present in the molecule of CBZ, in particular the -NH 2 group of forming hydrogen bond [39], one probable mechanism for CBZ adsorption was the formation of hydrogen bonds with π electrons from BAS on the tezontle surface. From studies on carbon surfaces, it has been found that basic properties are associated with Lewis sites located at the π electron-rich regions [38], characteristic of oxygen-containing functionality capable of acting as a basic center [40]. In this case, the presence of oxygen in a tezontle surface could be due to its main components, i.e., quartz and ferric oxides [32].…”

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confidence: 99%

Adsorption Capacity of a Volcanic Rock—Used in ConstructedWetlands—For Carbamazepine Removal, and Its Modification with Biofilm Growth

Tejeda

Barrera

Zurita

2017

Water

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Abstract:In this study, the aim was to evaluate the adsorption capacity of a volcanic rock commonly used in Mexico as filter medium in constructed wetlands (locally named tezontle) for carbamazepine (CBZ) adsorption, as well as to analyze the change in its capacity with biofilm growth. Adsorption essays were carried out under batch conditions by evaluating two particle sizes of tezontle, two values of the solution pH, and two temperatures; from these essays, optimal conditions for carbamazepine adsorption were obtained. The optimal conditions (pH 8, 25 • C and 0.85-2.0 mm particle-size) were used to evaluate the adsorption capacity of tezontle with biofilm, which was promoted through tezontle exposition to wastewater in glass columns, for six months. The maximum adsorption capacity of clean tezontle was 3.48 µg/g; while for the tezontle with biofilm, the minimum value was 1.75 µg/g (after the second week) and the maximum, was 3.3 µg/g (after six months) with a clear tendency of increasing over time. The adsorption kinetic was fitted to a pseudo-second model for both tezontle without biofilm and with biofilm, thus indicating a chemisorption process. On clean tezontle, both acid active sites (AAS) and basic active sites (BAS) were found in 0.087 and 0.147 meq/g, respectively. The increase in the adsorption capacity of tezontle with biofilm, along the time was correlated with a higher concentration of BAS, presumably from a greater development of biofilm. The presence of biofilm onto tezontle surface was confirmed through FTIR and FE-SEM. These results confirm the essential role of filter media for pharmaceutical removal in constructed wetlands (CWs).

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confidence: 99%