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Removal of Diclofenac by constructed wetlands planted with Phragmites australis...
Teixeira, D. Martins; Silva, Z.; Carvalho, A. J. Palace; Pinto, A. P.; Dordio, A.In the modern society, an ever increasing number of pharmaceutical active compounds (PhACs) is used for the treatment and prevention of various diseases. Ingested drugs are only partially absorbed by the organisms and studies have shown that the excreted compounds are only partially removed in the sewage treatment plants (STPs) [1]. Diclofenac is a non-steroidal anti-inflammatory drug taken to reduce inflammati...
Alteration and alterability of the anorthosite from Angola
Simão, J.; Silva, Z. C. G.Siliceous rocks are widely used as dimension stone but the last decades have registered an increase rate of their alteration when exposed to polluted environments. Anorthosites were treated by acidified solutions of HCl, HN03 and H2S04 simulating acid rain and the response was recorded through different experiments such as on the surface of the polished rock and on the surface of uncovered thin sections. The ma...
Synthesis and characterization of lanthanum- and yttrium-doped Fe2O3 pigments
Melo,D. M. A.; Melo,M. A .F.; Martinelli,A. E.; Silva,Z. R.; Cunha,J. D.; Lima,A. C.Iron oxide has been doped with rare earth ions (yttrium or lanthanum) aiming at producing ceramic pigments with hues that vary from orange to brown. The powders were synthesized from polymeric precursors using the Pechini method and subsequently calcined between 900 and 1100 ºC. The resulting pigments were characterized by BET, X ray diffraction, colorimetric analysis, UV-visible, infrared (FTIR), particle size...
Room temperature photoluminescence of (RE)NiO3 (RE=La, Y, Er, Ho, Nd and La1-xYx)
Silva,Z. R.; Melo,D. M. A.; Lima,A. C.; Longo,E.; Melo,M. A. F.; Martinelli,A. E.The nature of visible photoluminescence (PL) at room temperature in amorphous (RE)NiO3 (RE=La, Y, Er, Ho, Nd and La1-xYx) is discussed. Powders of this system were prepared by the polymeric precursor technique. The presence of broad PL band emission spectra at room temperature indicated increasing structural order with addition of rare earth elements.
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