Method and Application of Macrocyclic Amide Metal Complex to Degrade Wastewater Containing Organic Pollutants
A technology of metal complexes and organic pollutants, applied in organic compound/hydride/coordination complex catalysts, water/sewage treatment, chemical instruments and methods, etc., can solve secondary pollution, difficult large-scale application, equipment Harsh requirements and other issues, to achieve the effect of reducing chemical oxygen demand, applicable to a wide range of pH, and mild reaction conditions
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[0044] The preparation method of the catalyst used in the application is roughly as follows:
[0045] Under an inert gas atmosphere, add dimethylmalonyl chloride dropwise to a system composed of 2-aminoisobutyric acid and anhydrous pyridine, remove the solvent after the reaction to obtain an oil, and adjust the pH of the oil to 2- 3, suction filtration obtains dimethyl malonamide diacid;
[0046] Under an inert gas atmosphere, sequentially add dimethylmalonamide diacid and anhydrous treated 1,2-dichloroethane to the reaction vessel, then add thionyl chloride dropwise, and raise the temperature to reflux after the dropwise addition , react for 6-10h, remove the solvent to obtain dimethylmalonyl dichloride or difluoromalonyl dichloride;
[0047]C. Under an inert gas atmosphere, add the dimethylmalonamide dichloride obtained in the above steps B, the dichloromethane after anhydrous treatment to the reaction vessel successively, then add triethylamine dropwise, and add 3 in batch...
Embodiment 1
[0065] Establishment of the basic method
[0066] Preparation of buffer solution: use 0.06M potassium dihydrogen phosphate, dipotassium hydrogen phosphate, water and phosphoric acid to prepare a phosphate buffer solution with a pH of 2 and 3, and use 0.05M potassium hydrogen phthalate to prepare a phosphate buffer solution with a pH of 4. Use 0.06M potassium dihydrogen phosphate and 0.004M dipotassium hydrogen phosphate to prepare a phosphate buffer solution with a pH of 6, and use 0.1M potassium dihydrogen phosphate and 0.1M disodium hydrogen phosphate to prepare a phosphate buffer solution with a pH of 7 and 8 respectively , use 0.06M borax and 0.1M sodium hydroxide to prepare a borax buffer solution with a pH of 9 and 10, and use 0.1M sodium dihydrogen phosphate and 0.1M sodium hydroxide to prepare a phosphate buffer solution with a pH of 11 and 12. When preparing, the pH meter for precise measurement.
[0067] Hydrogen peroxide H 2 o 2 Concentration calibration: use a p...
Embodiment 2
[0079] Establish the working curve according to the method of Example 1, and test the decolorization rate of the dye Prasan blue degradation 30min under different pH values: the catalyst concentration of the control degradation system is 2.5*10 -7 M, the concentration of hydrogen peroxide is 2.5*10 -4 , the dye concentration is 100mg / L, and the temperature is 25°C. First add a certain concentration of buffer solutions with different pH values in the cuvette, the prepared dye Prasan blue, then add catalyst and hydrogen peroxide, measure the change curve of its absorbance at the maximum absorption wavelength with a UV spectrophotometer, and convert it into The decolorization rate is obtained as attached figure 1 The relationship curve of decolorization rate and pH value is shown.
[0080] This example shows that the catalyst with this structure can be used in a wide pH range from weakly acidic to strongly alkaline without affecting its catalytic activity, thereby increasing ...
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