Experimental devices: 1. Vacuum pump; 2. Ventilation tube; 3. Gas cylinder; 4. Rubber plug; 5. Sealing clip; 6. Stainless steel wire; 7. Sample flask; 8. Sample box; 9. Aluminum foil; 10. Magnetic stir bar; 11. Magnetic stirrer.

Abstract

<p>Experimental devices: 1. Vacuum pump; 2. Ventilation tube; 3. Gas cylinder; 4. Rubber plug; 5. Sealing clip; 6. Stainless steel wire; 7. Sample flask; 8. Sample box; 9. Aluminum foil; 10. Magnetic stir bar; 11. Magnetic stirrer.</p

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