DISSOLUTION OF ZINC OXIDE USING DEEP EUTECTIC SOLVENTS
DOI:
https://doi.org/10.24191/joa.v14.i1.7591Keywords:
dissolution, metal oxides, deep eutectic solventsAbstract
Deep eutectic solvents (DESs) have potential as substitutes for conventional solvents like aqueous acidic/alkali solutions in dissolving metal oxides (MO). DESs have several advantages and unique physicochemical properties, including their low toxicity, biodegradability, low cost, can be easily prepared from renewable resources, high viscosity, low volatility, and the ability to dissolve a wide range of compounds, including polar and nonpolar molecules, metals, and even biomolecules making them a more sustainable alternative than conventional solvents. This study focuses on the dissolution of zinc oxide (ZnO) using choline chloride (ChCl) based DESs with three different hydrogen bond donor (HBD) which are ascorbic acid (AA), maleic acid (MA) and urea. The characterisation of the DESs were determined by using Fourier-Transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The concentration of zinc (Zn) dissolved in the DESs was determined by atomic absorption spectroscopy (AAS) at different parameters such as heating time, heating temperature and mass of ZnO. This study found that different HBD could influence the dissolution of ZnO. ChCl:AA (2:1) shows the highest ability to dissolve ZnO. This study also found that ChCl:AA (2:1) and ChCl:MA (2:1) can dissolved 20 mg of ZnO while ChCl:urea (1:2) can dissolve about 6 mg of ZnO. The optimum dissolution parameter of ZnO in each DESs were obtained which are ChCl:AA (2:1) (70°C, 48 hours), ChCl:MA (2:1) (60°C, 18 hours) and ChCl:urea (1:2) (80°C, 48 hours).
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