Lidia Bandura

Charakterystyka zeolitów i ich zastosowanie jako adsorbentów substancji ropopochodnych

Przedstawiono wyniki badan wytrzymalościowych i energii rozpraszanej materialow wytworzonych z elastomeru polieterouretanowego w postaci walca i cylindrycznej tulei, rozniących sie wspolczynnikiem ksztaltu i przekrojem poprzecznym. Probki zsyntetyzowano z 4,4’-diizocyjanianu difenylometanu (MDI), oligo(oksytetra-metyleno)diolu (PTMG), a butano- 1,4-diol (BDO) uzyto jako przedluzacz lancucha prepolimeru. Stosunek molowy grup izocyjanianowych do hydroksylowych [NCO]/[OH] w reakcji wynosil 1,05. Zbadano wytrzymalośc na rozciąganie i ściskanie oraz wyznaczono wartości obciązen, ktore probki zdolne są przenosic pod obciązeniem cyklicznym. Zarejestrowano petle histerezy dla 3 cykli. Stwierdzono, ze ksztaltki o pelnym przekroju poprzecznym przenoszą niemal dwukrotnie wieksze obciązenia niz probki o przekroju pierścieniowym.

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

An admixture of lightweight aggregate substrates (beidellitic clay containing 10 wt % of natural clinoptilolite or Na-P1 zeolite) with used motor oil (1 wt %–8 wt %) caused marked changes in the aggregates’ microstructure, measured by a combination of mercury porosimetry (MIP), microtomography (MT), and scanning electron microscopy. Maximum porosity was produced at low (1%–2%) oil concentrations and it dropped at higher concentrations, opposite to the aggregates’ bulk density. Average pore radii, measured by MIP, decreased with an increasing oil concentration, whereas larger (MT) pore sizes tended to increase. Fractal dimension, derived from MIP data, changed similarly to the MIP pore radius, while that derived from MT remained unaltered. Solid phase density, measured by helium pycnometry, initially dropped slightly and then increased with the amount of oil added, which was most probably connected to changes in the formation of extremely small closed pores that were not available for He atoms.

Evaluation of Hydrocarbon Soil Pollution Using E-Nose

The possibility of detecting low levels of soil pollution by petroleum fuel using an electronic nose (e-nose) was studied. An attempt to distinguish between pollution caused by petrol and diesel oil, and its relation to the time elapsed since the pollution event was simultaneously performed. Ten arable soils, belonging to various soil groups from the World Reference Base (WRB), were investigated. The measurements were performed on soils that were moistened to field capacity, polluted separately with both hydrocarbons, and then allowed to dry slowly over a period of 180 days. The volatile fingerprints differed throughout the course of the experiment, and, by its end, they were similar to those of the unpolluted soils. Principal component analysis (PCA) and artificial neural network (ANN) analysis showed that the e-nose results could be used to detect soil contamination and distinguish between pollutants and contamination levels.

Changes in the Textural Parameters of Fly Ash-Derived Na-P1 Zeolite During Compaction Processes

Abstract This paper presents the possibility of receiving the granular forms of a zeolitic material of the Na-P1 type obtained from high-calcium fly ash in a semi-technical scale by means of three compacting techniques. The compaction process was carried out using cement, molasses and water glass as binders. Each of the proposed compacting methods affected the textural parameters of the obtained granular zeolite forms, as well as the binders used. In comparison to the other binders it was found that the cement binder had the smaller impact on the values of the textural parameters of the obtained compacted zeolite forms. The surface area for the zeolite Na-P1 was 98.49 m2·g-1, for the cement as a binder was 69.23 m2·g-1, for the molasses was 52.70 m2·g-1and for the water glass was 40.87 m2·g-1. For this reason, the briquetting and extruding tests were carried out using cement as a binder.