Double-loaded nano-Au composite material with function of removing CO at room temperature
A composite material and nanotechnology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as difficult to adhere firmly, difficult to form large-area sheets or films, etc., to achieve It is not easy to drop powder, avoid extrusion molding process, and the effect of small air resistance
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Embodiment 1
[0019] Embodiment 1: the preparation of pure titanium dioxide sol
[0020] Add 2.2mL of concentrated nitric acid (68wt%) into 300mL of deionized water to make a uniform solution, slowly drop 34.0mL of tetraisopropyl titanate into the prepared acidic aqueous solution under strong stirring, and the hydrolyzed solution contains white precipitate The suspension was continuously stirred at 40 °C until the white precipitate dissolved to form a homogeneous transparent sol. Put the sol into a dialysis membrane bag and perform dialysis treatment with 2L deionized water, and change the water every 12 hours until the final pH value of the dialysis water is 3.2. The sol was taken out from the dialysis bag to prepare a titania sol with a concentration of about 3.0 wt%.
Embodiment 2
[0021] Embodiment 2: Preparation of dual-loaded nano-Au composites
[0022] Spray 20mL of titanium glue prepared according to Example 1 evenly on one side of a glass fiber cloth (40cm×50cm), and then treat it at 120°C for 1 hour and dry to prepare a glass fiber cloth loaded with titanium dioxide. Take 6.0mL of 0.01g / mL HAuCl 4 Put the solution into a flat container (such as a medical tray) and add 600mL of water to dilute it, adjust the pH to about 8 with 0.1mol / L NaOH solution, stir well, and then immerse the glass fiber cloth loaded with titanium dioxide in it (the side sprayed with titanium glue faces above), placed in an oven at 80°C for 2 hours. Arrange the dried glass fibers loaded with titanium dioxide and Au in 600mL 0.1mol / L NaBH 4 solution, placed at room temperature for 0.5 hours, and then washed with deionized water to remove excess ions and dried at 60 °C to prepare a double-loaded nano-Au composite material. In this composite material, the titanium dioxide con...
Embodiment 3
[0023] Example 3: Activity Evaluation of Composite Material Catalytic Oxidation of CO at Room Temperature
[0024] The performance evaluation of the catalytic oxidation of CO at room temperature by the nano-Au composite prepared in Example 2 was carried out in a continuous flow reactor. The composite material (10cm×20cm) was packed in a stainless steel square (10cm×20cm) reactor, and 4 UV lamps (365nm, 8W) were arranged at 1cm on the upper surface of the material, and the O in the reaction gas 2 The content is fixed at 0.5V%, the CO concentration is about 150 ppm, He is used as the balance supplementary gas, the reaction gas flow rate is about 100mL / min, and the reaction starts at room temperature (about 16°C) without light. Agilent 4890D gas chromatograph (TCD as detector, TDX-01 packed column) was used to regularly analyze CO and O in the atmosphere. 2 and CO 2 The CO conversion rate was calculated according to the CO outlet concentration after different reaction times.
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