Sodium molybdate dihydrate na2moo4 2h2o

All the chemicals used to synthesise MoP hybrids with RGO were analytical grades. The chemicals that were used for MoP and GO involved sodium molybdate dihydrate (Na₂MoO₄·2H₂O), sodium hypophosphite monohydrate (NaH₂PO₂·H₂O), sodium nitrate (NaNO₃), hydrogen peroxide (H₂O₂), deionized water, graphite powder, potassium permanganate (KMnO₄), and sulfuric acid (H₂SO₄) were procured from Sigma Aldrich.

In a typical sonochemical process, was dissolved 1 mmol of copper nitrate trihydrate – Cu(NO₃)₂·3H₂O (Sigma-Aldrich, purity 98–103%) and 1 mmol of sodium molybdate dihydrate – Na₂MoO₄·2H₂O (Sigma-Aldrich, purity > 99.9%) separately in falcon tubes (50 mL capacity) with 40 mL of distilled water, at room temperature, using Vortex equipment. We added the solution with molybdate ions in a beaker flask (120 mL capacity) and sonicated at room temperature using a Schuster washer machine equipment, L100 model, with power and frequency of 160 W and 40 kHz, respectively. Subsequently, was added the copper ion solution drop-by-drop, where a green suspension rapidly got formed, and then we sonicated this suspension for 1 h at room temperature. The green precipitate obtained was washed several times and centrifugated at 5.000 rpm for 5 min for each cycle, using distilled water to remove the ${\text{Na}}^{+}$ and ${\text{NO}}_3^{-}$ ions. Finally, was dried the precipitate at 333 K for 48 h.