Zinc-aluminium hydrotalcite rich in cuprous ions and preparation method and application of zinc-aluminium hydrotalcite
A zinc-aluminum hydrotalcite and cuprous ion technology, applied in the preparation/separation of ammonia, chemical instruments and methods, zinc compounds, etc., can solve the problems of poor stability, easy disproportionation reaction, application limitations, etc., to improve stability , Ease of large-scale production, and low synthesis cost
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[0044] Example 1
[0045] Preparation of 0.5%-ZnAl-LDH-rich zinc-aluminum hydrotalcite rich in cuprous ions
[0046] 1) Prepare mixed metal precursor solution: Dissolve 0.1mmol copper nitrate trihydrate, 10mmol zinc nitrate hexahydrate and 10mmol aluminum nitrate nonahydrate in 15ml deionized water;
[0047] 2) Prepare alkali precursor solution: Dissolve 60mmol sodium hydroxide and 17.358mmol sodium carbonate in 15ml deionized water;
[0048] 3) Add the prepared metal precursor solution and alkali precursor solution dropwise to 15ml of deionized water at the same time, and mix well to obtain a suspension;
[0049] 4) Place the suspension obtained in step 3) on a constant temperature oil bath stirrer and crystallize at 60°C for 16 hours to obtain the product;
[0050] 5) Wash the product obtained in step 4) with deionized water for 10 times, dry at 60°C for 12 hours, and grind to obtain hydrotalcite nanosheets, which are zinc-aluminum hydrotalcite rich in cuprous ions, which are named 0.5...
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[0066] Example 2-4
[0067] The preparation process of the zinc-aluminum hydrotalcite rich in cuprous ions in Example 2-4 is basically the same as that in Example 1, except that the amount of copper salt is changed. The specific preparations are shown in Table 1. Named [0.25%-ZnAl-LDH, 1%-ZnAl-LDH, 3%-ZnAl-LDH], the XRD pattern of hydrotalcite is as follows figure 1 Shown. The prepared zinc-aluminum hydrotalcite rich in cuprous ions is used for photocatalytic nitrogen addition to water to prepare ammonia. The steps are the same as in Example 1, and the results obtained are shown in Table 1. Figure 4 Shown.
[0068] Table 1 Photocatalytic ammonia production rate of zinc-aluminum hydrotalcite with different cuprous ion content
[0069]
[0070] Combining the ammonia production rate of the hydrotalcite prepared in Example 1, Comparative Example 1-2 and Example 2-4 for photocatalytic synthesis of ammonia, it can be found that the rate of ammonia production is related to the content of ...
Example Embodiment
[0071] Example 5-9
[0072] The preparation process of the zinc-aluminum hydrotalcite rich in cuprous ions in Examples 5-9 is basically the same as that of Example 1, except that the crystallization temperature is changed, as shown in Table 2. The prepared zinc-aluminum hydrotalcite rich in cuprous ions is used for photocatalytic nitrogen addition to water to prepare ammonia. The steps are the same as in Example 1, and the results are shown in Table 2.
[0073] Table 2 Photocatalytic ammonia production rate of zinc aluminum hydrotalcite rich in cuprous ions prepared at different crystallization temperatures
[0074]
[0075] It can be seen from Table 2 that under full-spectrum irradiation for 1 hour, the rate of photocatalytic synthesis of ammonia is closely related to the crystallization temperature of the precursor. Within a certain crystallization temperature range, the prepared copper-rich zinc-aluminum hydrotalcite has a higher rate of catalyzing ammonia production. When the c...
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