Preparation method of composite catalyst for dye wastewater wet-type catalytic oxidation
A technology for wet catalytic oxidation and dye wastewater, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. The effect of high rate, variety, and ease of synthesis conditions
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example 1
[0016] Example 1. Adding different sodium salts as the precursor of Na prepares Na 2 Mo 4 o 13 / α-MoO 3 Methods
[0017] Under the conditions of 50°C (oil bath), normal pressure and vigorous stirring, 26.483g ammonium molybdate tetrahydrate and a certain quality of sodium salt, such as sodium nitrate, sodium chloride, sodium carbonate, sodium phosphate or sodium acetate, etc. ( The molar ratio of Na and Mo is controlled within the scope of 0.01-0.64) dissolved in 50mL deionized water. After the solution becomes a stable and transparent homogeneous solution, add sodium hydroxide solution until the pH of the system is 2-6, continue stirring for 0.5-1h after dropping, and strictly control the pH of the system. The obtained mixed solution was transferred to a hydrothermal reaction kettle, and then placed in a drying oven at 120° C. for heating, and the aging time was 18 hours. After taking it out, it is naturally cooled to room temperature and suction filtered. The filter cak...
example 2
[0018] Example 2. Cationic red degradation test method
[0019] Prepare cationic red GTL simulated dye wastewater with a concentration of 200mg / L in the laboratory. Under normal temperature (20-35°C) and normal pressure (1 atmosphere), take 300mL cationic red GTL simulated dye wastewater into a beaker and add 0.1g Catalyst, use an air pump for continuous aeration, control the air aeration rate to 0.4L / min, use a 10mL disposable syringe to take samples at regular intervals, filter through a 0.45μ aqueous membrane, and keep the samples for testing.
[0020]A 722s visible spectrophotometer was used to measure the absorbance value of the water sample to be tested at a wavelength of 488nm. Substituting the measured absorbance value into the standard curve obtained from the standard solution, the concentration of the water sample to be tested can be calculated, so as to further calculate the decolorization rate of the dye and determine the degradation performance of the catalyst.
example 3
[0021] Example 3 adds the Na prepared by different sodium salts 2 Mo 4 o 13 / α-MoO 3 Cationic red degradation activity
[0022] This example adopts the method in the example 1 to prepare Na 2 Mo 4 o 13 / α-MoO 3 , Then use the test method in the example 2 to measure its degradation performance. The results are shown in Table 1.
[0023] Table 1 Na prepared by adding different sodium salts 2 Mo 4 o 13 / α-MoO 3 Results of Degradation of Cationic Red
[0024]
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