Green Synthesis of Er-Doped ZnO Nanoparticles: An Investigation on the Methylene Blue, Eosin, and Ibuprofen Removal by Photodegradation oleh Marília C. R. Silva, Samuel Castro-Lopes, Aimée G. Jerônimo, Ricardo Barbosa, Alexsandro Lins, Pollyana Trigueiro, Bartolomeu C. Viana, Francisca P. Araujo, Josy A. Osajima, Ramón R. Peña-Garcia