Activated carbon loaded CeO2-x catalyst and preparation method and application thereof
A technology of activated carbon and catalyst, which is applied in the field of activated carbon-loaded CeO2-x catalyst and its preparation, can solve the problems of large influence of pH on oxidation efficiency, consume a large amount of alkali, and decrease in deprotonation efficiency, so as to broaden the use of pH value range, good The effect of the degradation effect
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Embodiment 1～5
[0041] Activated carbon supported CeO 2-x The preparation method of catalyst comprises the following steps:
[0042] (1) The activated carbon was ultrasonically washed 3 times with double distilled water, then ultrasonically washed once with 30% ethanol, and then air-dried at 80°C for 12 hours;
[0043] (2) At 500°C, N 2 Under the atmosphere, the activated carbon after washing and drying was roasted for 4 hours in a tube furnace, and then cooled to room temperature for later use;
[0044] (3) adding 10 g of activated carbon carrier after roasting and cooling into 20 mL of a certain concentration of cerous nitrate solution and impregnating it for 6 h;
[0045] (4) Take out the impregnated solid with tweezers, put it into a glass watch glass, and air-dry it at 80°C for 12 hours;
[0046] (5) Transfer the dried impregnated solid into a tube furnace, at 500°C, N 2 Roasting under atmosphere for 4h (heating rate is 3°C·min -1 ), cooled naturally to room temperature to obtain ac...
Embodiment 6～11
[0053] The catalysts prepared in Comparative Example 1 and Examples 1-5 were applied to degrade acetic acid simulated wastewater.
[0054] Configure 250mL of acetic acid solution with a concentration of 100ppm as simulated wastewater, adjust its initial pH to 3, and add H to the simulated wastewater 2 o 2 Make its initial concentration 100mg·L -1 , Examples 6-11 add the catalysts prepared in Comparative Example 1 and Examples 1-5 to the simulated wastewater respectively, so that the catalyst concentration in the simulated wastewater is 4g L -1 , continue to feed ozone to react for 30min, and the dosage of ozone is 22.07mg·min -1 .
[0055] After the reaction, the residual concentration of acetic acid in the simulated wastewater was calculated respectively, and the removal rate of acetic acid was calculated. The results are shown in Table 1.
[0056] Catalyst impregnation concentration and acetic acid removal rate in the embodiment 6~11 of table 1
[0057] Detect...
Embodiment 12～14
[0060] Compared with Example 9, Examples 12-14 adjusted the initial pH of the simulated wastewater to 1, 5 and 7 respectively, and other reaction conditions and parameters were the same as Example 9.
[0061] After the reaction, the residual concentration of acetic acid in the simulated wastewater was calculated respectively, and the removal rate of acetic acid was calculated. The results are shown in Table 2.
[0062] The acetic acid removal rate in the embodiment 9 of table 2 and embodiment 12~14
[0063] Detection Indicator Example 12 Example 9 Example 13 Example 14 initial pH 1 3 5 7 Acetic acid removal rate (%) 20.25 65.88 70.2 99.7
[0064] It can be seen from Table 2 that AC-Ce / H 2 o 2 / O 3 The efficiency of the system decreases with the decrease of pH. Under the conditions of pH 3 and 5, AC-Ce / H 2 o 2 / O 3 The efficiency of the system is relatively close.
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