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Method for removing iodo-X-ray contrast medium in water

An X-ray and water-removing technology, which is applied in the field of removing iodine X-ray contrast agents in water, can solve problems such as difficult removal and human hazards, and achieve the effects of outstanding safety, good stability, and simple operation

Inactive Publication Date: 2019-02-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the stability of ICM, traditional water treatment methods are difficult to effectively remove them. Although the concentration of ICM in drinking water is mostly at the ng / L level, they may gradually accumulate in the environment and cause harm to the human body.

Method used

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  • Method for removing iodo-X-ray contrast medium in water
  • Method for removing iodo-X-ray contrast medium in water
  • Method for removing iodo-X-ray contrast medium in water

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Iodine X-ray contrast agents in water mainly include iohexol, iopamidol, iopromide, iomeprol and ionic diatrizoate. Free radicals (·OH) can degrade iopamidol, but other X-ray contrast agents are difficult to degrade through OH, and the bond breaking energy required by iohexol for its degradation is The highest, especially the bond breaking between the carbon on the benzene ring and the iodine element needs to span energy, which requires extremely high oxidation ability of free radicals, and it is difficult for other conventional oxidative degradation agents to degrade it, so iodine is selected in this embodiment. Take hexanol as an example.

[0030] During the degradation process, adjust the raw water containing 10 μM iohexol to pH = 7, control the temperature at 25°C, add sodium persulfate to the reaction solution and stir at a low speed to make it evenly mixed. After 2 minutes, the reaction solution is subjected to ultraviolet light. irradiated. Calculated according...

Embodiment 2

[0033] Taking iohexol as an example, adjust the raw water containing 10 μM iohexol to pH = 7, control the temperature at 25°C, add sodium persulfate to the reaction solution and stir at a low speed to make it evenly mixed, the dosage of sodium persulfate It was 47.6 mg / L, and after 2 minutes, the reaction solution was irradiated with ultraviolet light. Calculated according to the concentration of substances in water, the intensity of ultraviolet light is 0μW / cm 2 、153μW / cm 2 、238μW / cm 2 , 296μW / cm 2 , the degradation rate of iohexol varies with the reaction time as figure 2 shown.

[0034] Sodium persulfate could not oxidize iohexol alone without ultraviolet light irradiation, and the degradation rate of iohexol was significantly increased by ultraviolet light irradiation, and it was positively correlated with the intensity of ultraviolet light.

Embodiment 3

[0036] Take iohexol as an example, control the temperature at 25°C, add sodium persulfate to the raw water containing 10 μM iohexol and stir at a low speed to mix well, the dosage of sodium persulfate is 47.6mg / L, after 2min The reaction solution was irradiated with ultraviolet light. Calculated according to the concentration of substances in water, when the pH is 5, 6, 7, 8, and 9 respectively, the relationship between the degradation rate of iohexol and the pH of the reaction solution after 5 minutes of reaction is as follows image 3 shown.

[0037]The degradation rate of iohexol is less affected by pH changes within a certain pH range (pH=5-9), and the degradation rate under neutral and weakly alkaline conditions is basically the same, while the degradation effect is slightly improved under weakly acidic conditions. And the degradation rate exceeds 90%. Generally speaking, the degradation rate does not decrease significantly with the change of pH, therefore, the method h...

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Abstract

The invention relates to a method for removing an iodo-X-ray contrast medium in water. The method includes the steps: oxidant feeding, to be more specific, adding sodium persulfate into to-be-treatedwater until the concentration of sodium persulfate in the water reaches 23.8-71.4mg / L; ultraviolet irradiation, to be more specific, subjecting the to-be-treated water to ultraviolet irradiation for 5-10 minutes after oxidant feeding. Compared with the prior art, the method has advantages that high degradation efficiency is achieved, the concentration of the ICM (iodo-X-ray contrast medium) in thewater can be decreased by 87% or more, the method is slightly affected by pH (potential of hydrogen) changes, and reaction products are mainly sulfate ions and iodate ions and can be removed by simple coagulation, precipitation or membrane filtration, so that the method is a safe and stable drinking water treatment method.

Description

technical field [0001] The invention relates to a method for degrading contrast agents, in particular to a method for removing iodine X-ray contrast agents in water. Background technique [0002] Due to the development and progress of society and industrial technology, the types and quantities of artificially synthesized organic substances continue to increase and are widely used. Among them, pharmaceuticals and personal care products (PPCPs) are the most widely used. According to incomplete statistics, there are more than 3,000 types of PPCPs. In recent years, with the improvement of detection technology, different concentrations of PPCPs have been detected in the environment of different countries and regions in the world, and many of them have been proved to be harmful substances with neurotoxicity and genotoxicity. Although the detected concentrations of these substances are very low and belong to trace organic substances, the harm to human body and environment cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/30
CPCC02F1/32C02F1/66C02F1/722C02F9/00C02F2101/30
Inventor 胡晨燕侯元璋邓焰国华双静杜一凡张继晨任思橙
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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