Method for catalytically and ultrasonically degrading meloxicam by using semiconductor material zinc tungstate
A meloxicam and ultrasonic degradation technology, applied in chemical instruments and methods, natural water treatment, oxidized water/sewage treatment, etc., can solve the problems of high pollutant content in wastewater, large changes in water quality and quantity, and poor biodegradability , to achieve the effect of no secondary pollution, easy operation, and no secondary pollution
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Embodiment 1ZnW
[0022] Example 1ZnWO 4 Preparation
[0023] Include the following steps:
[0024] Step 1: According to a certain quantitative ratio, 0.17mol L -1 Na 2 WO 4 2H 2 O solution was added to the beaker, and 0.17mol·L -1 Zn(NO 3 ) 2 ·6H 2 O, adjust the pH value to about 6 with NaOH or HCl solution, stir magnetically for 30 minutes at room temperature, and sonicate for 30 minutes.
[0025] Step 2: Put the solution prepared in Step 1 into a polytetrafluoroethylene-lined autoclave for reaction at 180° C., and naturally cool to room temperature after the reaction.
[0026] Step 3: The product is filtered, washed, dried and ground to obtain ZnWO 4 powder.
[0027] Fig. 1 (a) is the product ZnWO that embodiment 1 prepares 4 The X-ray diffraction (XRD) spectrogram; Fig. 1 (b) and (c) are the scanning electron micrographs of the product prepared in embodiment 1; As can be seen from the figure, the synthesized product of embodiment 1 is ZnWO 4 , and its morphology is granular.
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Embodiment 2
[0029] Embodiment 2 The method of semiconductor material zinc tungstate catalyzed ultrasonic degradation of meloxicam
[0030] Include the following steps:
[0031] Step 1: Take 20 mL of meloxicam solution with a concentration of 10 mg / L in an Erlenmeyer flask, and add accurately weighed 10 mg of nano-ZnWO 4 powder, sonicated.
[0032] Step 2: Take the supernatant after the suspension is sampled and centrifuged.
[0033] Step 3: Measure its UV-vis spectrum within 200-450nm. The degradation rate of meloxicam available solution in its lambda max = Absorbance at 360nm to calculate, the formula is: degradation rate (%)=[(A 0 -A t ) / A 0 ]×100%, A 0 is the initial absorbance of the meloxicam solution, A t is the absorbance of meloxicam solution under different experimental conditions.
Embodiment 3
[0034] Embodiment 3 The method of semiconductor material zinc tungstate catalyzed ultrasonic degradation of meloxicam
[0035] wxya 4 The degradation experiment of meloxicam was carried out in ZnWO 4 The addition amount is 0.50-1.50g / L, ZnWO 4 The pH value is 6, the concentration of meloxicam is 10mg / L, the ultrasonic power is 200W, and the ultrasonic time is 120min.
[0036] Take 20mL of 10mg / L meloxicam solution, add 0.50g / L nanometer ZnWO once 4 The powder was ultrasonically treated for 120min. After the suspension was sampled and centrifuged, the supernatant was taken, and its UV-vis spectrum was measured within 200-450 nm.
[0037] ZnWO 4 The amount of addition was changed to 0.75, 1.00, 1.25, 1.50g / L in turn, and the above experiment was repeated.
[0038] image 3 For Example 3 using ZnWO 4 When it is used as an acoustic catalyst, its addition amount affects the effect of catalytic ultrasonic degradation of meloxicam solution; image 3 know, when ZnWO 4 When t...
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