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Method for degrading iodinated drugs by activating sulfite system

A technology for activating sulfite and sulfite, applied in chemical instruments and methods, water pollutants, oxidized water/sewage treatment, etc., can solve the problems of increasing equipment investment and operating costs, high cost of oxidant persulfate, etc., to achieve High electron transfer efficiency, high recycling rate, and cost-saving effects

Active Publication Date: 2021-03-19
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deficiency of above invention is: the cost of oxidizing agent persulfate is higher, and the activation of persulfate by external energy will increase equipment investment and operating cost

Method used

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  • Method for degrading iodinated drugs by activating sulfite system
  • Method for degrading iodinated drugs by activating sulfite system
  • Method for degrading iodinated drugs by activating sulfite system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] As a method of activating the sulfite system to degrade iodine drugs, the activator selects transition metal sulfide, which can be copper sulfide, cobalt sulfide, manganese sulfide and iron sulfide, etc. Potassium sulfite / sodium / calcium / magnesium is sulfate As the precursor of free radicals and micro-pollutants, iohexol, an iodized X-ray contrast agent, is selected.

[0027] First, add 0.001g-0.05g of cobalt sulfide to the water to be treated with iohexol as the iodo drug; then, add sulfite to start the reaction and start timing; , 10, 20 and 30 minutes, samples were taken through a 0.22 μm filter membrane to quench the active free radicals in the reaction solution, and the concentration of iohexol was analyzed by ultra-high performance liquid chromatography.

[0028] The effect of different doses of cobalt sulfide on the degradation efficiency of iohexol is as follows: figure 1 As shown, the abscissa represents the dose of cobalt sulfide (g / L), and the ordinate repres...

Embodiment 2

[0030] The difference between this embodiment and specific example 1 is: through the optimization of cobalt sulfide concentration in embodiment 1, the concentration of cobalt sulfide is finally selected to be 0.05g / L; in the present embodiment, the concentration range of sulfite is 100- 1000 μM.

[0031] The effect of different sulfite concentrations on the degradation efficiency of iohexol was as follows: figure 2 As shown, the abscissa indicates the concentration of sulfite (μM), and the ordinate indicates the degradation of iohexol (C / C 0 ). In this example, the concentration of sulfite was optimized, and the degradation of iohexol at concentrations of 100, 250, 500, 750, and 1000 μM were performed respectively, wherein the dose of cobalt sulfide was 0.05 g / L, and iohexol The concentration is 10 μM, and the pH value is 8. The result shows: the raising of sulfite concentration, promptly the sulfite ion concentration that can participate in reaction raises in the system, ...

Embodiment 3

[0033] The difference between this embodiment and the specific example 2 is: through the optimization of the sulfite concentration in Example 2, the concentration of sulfite is finally selected as 500 μM; in this example, the concentration range of iohexol is 2-10 μM .

[0034] The effect of different iohexol concentrations on the degradation efficiency of iohexol is as follows: image 3 As shown, the abscissa represents the concentration of iohexol (μM), and the ordinate represents the degradation of iohexol (C / C 0 ). In this example, different concentrations of iohexol were degraded, and degradations were performed at concentrations of 2, 4, 6, 8, and 10 μM respectively, wherein the dose of cobalt sulfide was 0.05 g / L, and the concentration of sulfite 10 μM, pH 8. The results show that: when the concentration of iohexol is 2-8μM, the degradation effect of the system on iohexol can reach 100%; when the concentration of pollutants is 10μM, the degradation efficiency is ~89%...

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Abstract

The invention discloses a method for degrading iodinated drugs by activating a sulfite system. According to the method, a transition metal sulfide is selected as an activating agent, and a sulfite which is low in cost and environment-friendly is selected as a precursor of sulfate radical free radicals. The method comprises the following specific steps: respectively adding a transition metal sulfide and a sulfite into a water body polluted by iodinated drugs, and continuously conducting stirring. According to the method, the property that the transition metal sulfide reacts with the sulfite togenerate sulfate free radicals with strong oxidizing property is utilized, so that the purpose of quickly degrading iodinated drugs in the polluted water body is achieved. The transition metal sulfideused in the method has the advantages of small leaching amount of transition metal ions, wide pH value application range, high electron transfer efficiency, good stability and the like, can be used as an environment-friendly heterogeneous activator to promote the generation of sulfate radicals, and provides an effective treatment method for solving the problem of low degradation efficiency of iodinated drugs.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for activating a sulfite system to degrade iodo drugs. Background technique [0002] As an important class of pharmaceutical micropollutants, iodine drugs are frequently detected in water bodies around the world and their refractory properties gradually threaten the environment. It has been reported that sulfate radical-based advanced oxidation technology (SR-AOPs), as an advanced water treatment technology, can effectively generate strong oxidizing sulfate radicals for the degradation of iodized drugs. Sulfate radicals have the advantages of high redox potential (2.5-3.1V), high activity, and good selectivity; and sulfate radicals can react in a wide pH range and have a long half-life (30-40μs) , High reaction rate with pollutants (10 6 -10 9 m -1 the s -1 ), the reaction is less affected by the background substances of water quality, etc. Therefore, the advanced ox...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/12
CPCC02F1/72C02F2101/12Y02W10/37
Inventor 赵晓丹荆国华周作明武英
Owner HUAQIAO UNIVERSITY
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