1. SiliCycle Inc., 1200 Av. St-Jean-Baptiste, suite 114, Quebec, Canada G2E 5E8, Istituto per lo Studio dei Materiali Nanostrutturati, CNR, via Ugo La Malfa 153, 90146 Palermo, Italy, and Institute of Chemistry, The Hebrew University of Jerusalem Givat Ram, 91904 Jerusalem, Israel