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Photocatalytic Oxidative Degradation of Chlorophenol Pollutants by Sodium Vanadium Borate

A technology of photocatalytic oxidation and sodium vanadium borate, applied in water pollutants, chemical instruments and methods, light water/sewage treatment, etc., can solve the problems of high cost and large catalyst loss

Inactive Publication Date: 2016-03-16
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the device is expensive and the catalyst loss is very large

Method used

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  • Photocatalytic Oxidative Degradation of Chlorophenol Pollutants by Sodium Vanadium Borate
  • Photocatalytic Oxidative Degradation of Chlorophenol Pollutants by Sodium Vanadium Borate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 2-chlorophenol in methanol to make the concentration 10g / L, take 2mL of the dissolved solution, put it in a beaker with a volume of 250mL, add water to dilute it to 20mg / L, and then place it in ultrasonic treatment for 60min, so that It is a homogeneous and stable solution;

[0021] Add 10 mg of sodium vanadium borate powder into the ultrasonically treated solution under light-shielding conditions, stir for 30 minutes, pipette 4 mL into a centrifuge tube, and store in the dark;

[0022] The temperature of the system is maintained at 25°C, and then the remaining solution system is irradiated under a xenon lamp that has stabilized luminescence at a wavelength of 420nm. The system is 10cm away from the outlet of the xenon lamp. 2 , sample 4mL every 1min;

[0023] After centrifuging all the samples that have been taken out, take the supernatant, test the UV-Vis absorption spectrum and high-performance liquid chromatography of the material, and analyze the degradat...

Embodiment 2

[0025] Dissolve 2,4-dichlorophenol in methanol so that the concentration is 10g / L, take 0.5mL of the dissolved solution, put it in a beaker with a volume of 250mL, add water to dilute it to 50mg / L, and then place it in an ultrasonic Treat in medium for 60min to make it a uniform and stable solution;

[0026] Add 50 mg of sodium vanadium borate powder into the ultrasonically treated solution under light-shielding conditions, stir for 30 minutes, pipette 4 mL into a centrifuge tube, and store in the dark;

[0027] The temperature of the system is maintained at 25°C, and then the remaining solution system is irradiated at room temperature under natural light, and the energy density is 0.5-2mw / cm 2 , sample 4mL at intervals of 5 minutes;

[0028] After centrifuging all the samples that have been taken out, take the supernatant to test the UV-visible absorption spectrum and high-performance liquid chromatography of the material, analyze the degradation efficiency of pollutants and...

Embodiment 3

[0030] Dissolve 2,4,6-trichlorophenol in methanol to make the concentration 10g / L, take 5mL of the dissolved solution, put it in a 250mL beaker, add water to dilute it to 500mg / L, and place in Ultrasonic treatment for 60min to make it a uniform and stable solution;

[0031] Add 50 mg of sodium vanadium borate powder into the ultrasonically treated solution under light-shielding conditions, stir for 40 minutes, pipette 4 mL into a centrifuge tube, and store in the dark;

[0032] The temperature of the system is kept at room temperature 25°C, and then the remaining solution system is irradiated under a xenon lamp that has been stably emitting light, the wavelength is 420nm, the system is 10cm away from the outlet of the xenon lamp, the spot diameter of the xenon lamp is 50mm, and the energy density is 1218mw / cm 2 , sample 4mL at intervals of 0.5min;

[0033] After centrifuging all the samples that have been taken out, take the supernatant, test the UV-Vis absorption spectrum of...

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Abstract

The present invention relates to a method for application of sodium vanadium borate in oxidation degradation of chlorophenol contaminants under photocatalysis. According to the method, chlorophenol is adopted as the contaminant, in the presence of sodium vanadium borate, the aqueous solution with the contaminant concentration of 10-2000 mg / L is subjected to degradation under nature light irradiation and 50% of the contaminant can be degraded within 20-30 min, the aqueous solution with the contaminant concentration of 10-2000 mg / L is subjected to degradation under ultraviolet-visible irradiation (wavelength range of 320-780 nm) and ultraviolet irradiation (254 nm) and the dechlorination efficiency can achieve 97-99% within 5 min, and the analysis results of the ultraviolet-visible spectrometer and the high performance liquid chromatography show that the chlorophenol is finally degraded into the small molecule carboxylic acid and the chlorine-containing solution. The method of the present invention has characteristics of simple operation process, low cost, rapid and efficient dechlorination of chlorinated aromatic hydrocarbons, and good uses on environmental protection.

Description

technical field [0001] The invention relates to a method for efficient and rapid degradation of sodium vanadium borate in chlorine atmosphere pollution. Background technique [0002] Chlorophenol compounds are widely used as wood preservatives, rust inhibitors, herbicides, fungicides, and papermaking industries. They have odor, peculiar smell, and high toxicity. They are also used in the prevention and treatment of schistosomiasis in Asia, Africa, and South America. , so the production scale of chlorophenols in many industrialized countries is very large. Chlorophenol aromatic compounds are highly toxic, difficult to biodegrade, have "three-cause" effects and genotoxicity, remain in the environment for a long time, and have a long degradation cycle. They are listed as priority pollutants by the US Environmental Protection Agency. The extensive use of chlorophenol compounds, the lack of awareness of the hazards and toxicity of chlorophenols in the early stage, and the accomp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/32C02F101/36
CPCC02F1/30C02F1/32C02F2101/36
Inventor 范晓芸王贞王传义华宁
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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