Composite photocatalyst CdS/LaPO4 and preparation method and application thereof
A catalyst and composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low solar energy utilization rate, restrictions on the practical application of photocatalytic technology, low quantum efficiency, etc., to achieve Good catalytic activity and stability, conducive to large-scale promotion, and high charge separation efficiency
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[0021] The preparation method of the photocatalyst is a two-step method;
[0022] Specific steps are as follows:
[0023] Hydrothermal preparation of CdS: Dissolving cadmium salt in ethylenediamine to obtain a cadmium source solution with a concentration of 0.1-2 mol / L; dissolving sulfur salt in ethylenediamine to obtain a sulfur source solution with a concentration of 0.1-2 mol / L; Add the sulfur source solution dropwise to the cadmium source solution while stirring, continue to stir for 30 to 180 minutes after the dropwise addition, and then transfer it to a high-pressure reactor at a constant temperature of 90 to 240°C for 12 to 24 hours, and centrifugally wash the obtained precipitate with water and ethanol until The total ion concentration is <10ppm, dried at 40-120°C for 6-24 hours, and ground to obtain yellow CdS powder; the molar ratio of the cadmium source to the sulfur source is 0.1-3:1; the stirring is magnetic stirring , the stirring speed is 400~1000 rad / min.
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Embodiment 1
[0025] Example 1 Composite photocatalyst CdS / LaPO 4 preparation of
[0026] Weigh 2.78gCd(NO 3 ) 2 4H 2 O and 2.05g of thiourea were dissolved in 80mL of ethylenediamine, stirred for 30min, transferred to a 100mL autoclave, heated in water at 200°C for 12h, cooled to room temperature, cleaned by centrifugation, and vacuum-dried at 80°C for 12h to obtain CdS; weigh 0.204 G CdS was ultrasonically dispersed in 100 mL of water, 50 mg of citric acid was added, heated in a water bath to 40 °C for 2 h, cooled to room temperature, and 0.1 mol / L La(NO 3 ) 3 Solution 50 mL, continue to stir for 2 h, cool to room temperature, wash by centrifugation, and dry at 80 °C for 12 h to obtain CdS / LaPO 4 .
[0027] figure 1 The X-ray diffraction pattern of the material prepared for this example, it can be seen from the figure that the prepared CdS is hexagonal CdS (JCPDS:77-2306), and the prepared LaPO 4 Hexagonal LaPO 4 (JCPDS: 04-0635), CdS / LaPO 4 Composite samples simultaneously app...
Embodiment 2
[0029] Example 2 Composite photocatalyst CdS / LaPO 4 Photocatalytic CO 2 reduction
[0030] With the CdS / LaPO that embodiment 1 makes 4 Composites used as photocatalysts for CO reduction 2 , the reaction was carried out in a cylindrical glass reactor with a closed volume of 100 mL under normal pressure, using a 300W xenon lamp as the light source (with a 420nm filter), weighed 20 mg of the sample into the reactor, and then added 3 mL Water, 2 mL of acetonitrile, 1 mL of triethanolamine, 15 mg of cobalt bipyridyl, and stirred evenly by a magnetic stirrer. Vacuumize the system with a mechanical pump, and then fill it with high-purity CO 2 , turn on the light after 30 min of adsorption equilibrium. The gas phase product produced by the reaction is injected manually into the chromatographic inlet through the gas sampling needle, and is detected and analyzed by the gas chromatograph.
[0031] image 3 The activity figure of carbon dioxide reduction in the system of embodiment...
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