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Method for removing iopamidol in water by ultraviolet/chlorine combined process

A combined process and water removal technology, applied in water/sewage treatment, chemical instruments and methods, special compound water treatment, etc., can solve the problem of low safety and practicability of chloramine process, limited treatment effect, unstable removal rate, etc. It can improve the feasibility and operability, the method is simple and practical, and the reaction conditions are easy to control.

Inactive Publication Date: 2019-09-27
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in recent years, studies have found that more harmful nitrogen-containing disinfection by-products - nitrosamines, halogenated nitromethanes, halogenated acetonitrile, etc., are produced during the use of chloramines, so the safety and practicability of the chloramine process is not high
Scholars at home and abroad have also explored several iopamidol removal methods on this basis, including bioelectrochemical reduction removal (high cost) and Fenton's reagent (low removal rate, only 41.5%) and biodegradation conversion (long period, Unstable removal rate) and other removal methods, but the treatment effect is limited

Method used

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  • Method for removing iopamidol in water by ultraviolet/chlorine combined process
  • Method for removing iopamidol in water by ultraviolet/chlorine combined process
  • Method for removing iopamidol in water by ultraviolet/chlorine combined process

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Effect test

Embodiment 1

[0053] The method for removing iopamidol in water by ultraviolet / chlorine combined process, the concrete steps are as follows:

[0054] The initial concentration of iopamidol is 10 μM prepared with ultrapure water, the initial pH of the iopamidol solution is adjusted to 7.0 with acid-base solution, and sodium hypochlorite is added to the iopamidol solution, and the dosage is [HOC1] 0 = 200 μM (in C1 2 meter), and UV irradiation was carried out at the same time, and the UV intensity was controlled to be 2.43 mW / cm 2 , control the reaction temperature to 25 ℃.

[0055] In the single chlorination process (comparative example 1), the single ultraviolet process (comparative example 2) and the ultraviolet / chlorination combined process (embodiment 1), the iopamidol concentration curve with time is as follows: figure 1 As shown, it can be seen that the removal effect of iopamidol is different under different processes. The simultaneous action of UV / chlorine can greatly improve the ...

Embodiment 2

[0057] A method for removing iopamidol in water by an ultraviolet / chlorine combined process, the concrete steps are as follows:

[0058] The initial concentration of iopamidol was prepared with ultrapure water to 10 μM, the initial pH of iopamidol solution was adjusted to 7.0 with acid-base solution, and sodium hypochlorite was added to the iopamidol solution, and the dosage was controlled to [HOC1] 0 =0μM, 50μM, 100μM, 200μM, 500μM, 1000μM (with C1 2 meter), and UV irradiation was carried out at the same time, and the UV intensity was controlled to be 2.43 mW / cm 2 , the reaction temperature was controlled at 25°C during the reaction, and the removal rates of iopamidol after 300s of reaction were 43.72%, 84.71%, 96.16%, 97.90%, 98.10%, and 99.24%, respectively. figure 2 .

[0059] from figure 2 It can be seen that under the condition that the UV intensity remains unchanged, as the amount of chlorine increases, there will be more Cl in the system 2 , HOCl / OCl - Degradati...

Embodiment 3

[0061] A method for removing iopamidol in water by an ultraviolet / chlorine combined process, the concrete steps are as follows:

[0062] The initial concentration of iopamidol is 10 μM prepared with ultrapure water, the initial pH of iopamidol solution is adjusted to 7.0 with acid-base solution, and sodium hypochlorite is added to the iopamidol solution, and the dosage is [HOC1] 0 = 200 μM (in C1 2 meter), and UV irradiation was performed at the same time, and the UV intensity was controlled to be 2.43 mW / cm 2 , 4.94mW / cm 2 , 7.34mW / cm 2 , 9.76mW / cm 2 , under the experimental conditions where the reaction temperature was controlled at 25 °C, the removal rate of iopamidol was greater than 98% after the reaction for 300 s. image 3 .

[0063] Depend on image 3 It can be seen that with the increase of UV intensity, the photodegradation rate of iopamidol is gradually accelerated. UV intensity is 9.76mW / cm 2 , when the degradation time was only 120s, the degradation of iop...

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Abstract

The invention relates to a method for removing iopamidol in water by an ultraviolet / chlorine combined process. The method comprises the following specific steps: (1) pretreating a to-be-treated water sample; (2) adding a solution which contains or can produce free chlorine to the pretreated water sample in step (1), adjusting the pH value, and carrying out an ultraviolet catalytic oxidation reaction to remove the iopamido in the water. Compared with the prior art, according to the method, the pH value of a reaction water body is appropriately adjusted by an ultraviolet / chlorine combined technological process, so that the content of the iopamidol in a water body can be rapidly reduced, and the removal effect can reach 99% or above; the operation is simple; the reaction conditions are easy to control; engineering application is easy to realize; in addition, chemical reagents and materials used are both conventional products for water treatment; no other toxic and harmful substances are introduced; the safety is particularly prominent; the reaction environment is easy to realize; treatment can be carried out under room temperature conditions; the feasibility and operability of the method are effectively improved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for removing iopamidol in water by an ultraviolet / chlorine combined process. Background technique [0002] Contrast agents are widely used in medicine for soft tissue imaging (eg organs, veins, blood vessels, etc.) and are among the most inert and highly stable personal care products [1] . In recent years, with the continuous development and application of medical technology, its clinical practicability and universality are getting higher and higher. Iodine contrast agent (ICM) is a triiodinated derivative on the 2, 4, and 6 positions on the benzene ring. The introduction of side chains at other positions on the benzene ring can increase water solubility and reduce toxicity. It is mainly divided into ionic compounds and Non-ionic compounds, iopamidol, as a representative non-ionic substance of ICM, is of great significance to the study of its removal and degrad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/76C02F101/36C02F101/34C02F101/38
CPCC02F1/32C02F1/725C02F1/76C02F2101/34C02F2101/36C02F2101/38C02F2209/06C02F2305/023
Inventor 马世旭田富箱叶文凯邢海波胡晓钧
Owner SHANGHAI INST OF TECH
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