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Method for removing iopamidol in water by UV/NH2Cl combined process

A combined process and water removal technology, which is applied in the field of water treatment, can solve the problems of limited treatment effect, unstable removal rate, and low removal rate, and achieve the effects of complete degradation, improved feasibility and operability, and simple operation

Pending Publication Date: 2020-10-13
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have explored several ways to remove iopamidol, including bioelectrochemical reduction (high cost) and Fenton’s reagent (low removal rate, only 41.5%) and biodegradation transformation (long cycle, 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 UV/NH2Cl combined process
  • Method for removing iopamidol in water by UV/NH2Cl combined process
  • Method for removing iopamidol in water by UV/NH2Cl combined process

Examples

Experimental program
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Effect test

Embodiment 1

[0048] UV / NH 2 Cl combined process removes the method for iopamidol in water, and concrete steps are as follows:

[0049] Use ultrapure water to prepare the initial concentration of iopamidol to be 10 μM, use acid and alkali solution to adjust the initial pH of iopamidol solution to 7.0, add NH to the iopamidol solution 2 Cl, the dosage is 200μM, and the ultraviolet radiation is carried out at the same time, and the ultraviolet intensity is controlled to be 2.43mW / cm 2 , control the reaction temperature to 25°C.

[0050] NH alone 2 Cl process (comparative example 1), separate UV process (comparative example 2) and UV / NH 2 In the Cl combined technique (embodiment 1), the iopamidol concentration curve with time is as figure 1 As shown, it can be seen that the removal effects of iopamidol under different processes are different. UV / NH 2 The simultaneous action of Cl can greatly increase the removal rate of iopamidol. NH alone 2 The Cl process has almost no removal effect ...

Embodiment 2

[0052] UV / NH 2 Cl combined process removes the method for iopamidol in water, and concrete steps are as follows:

[0053] Use ultrapure water to configure the initial concentration of iopamidol to be 10 μM, use acid and alkali solution to adjust the initial pH of iopamidol solution to 7.0, add NH to the iopamidol solution 2 Cl, control NH 2 The dosing concentration of Cl was 0, 50, 100, 200, 300 and 500 μM, and at the same time, UV irradiation was carried out immediately and the UV intensity was controlled at 2.43mW / cm 2 , the reaction temperature is controlled at 25°C during the reaction, and the degradation of iopamidol after 300s of reaction is as follows figure 2 shown.

[0054] From figure 2 It can be seen that the removal efficiency of iopamidol increases with that of NH 2 increased with the increase of Cl dosage. Under the same UV intensity, with NH 2 The concentration of Cl gradually increased from 0 to 500 μM, and the removal rate of iopamidol also increased ...

Embodiment 3

[0056] UV / NH 2 Cl combined process removes the method for iopamidol in water, and concrete steps are as follows:

[0057] Use ultrapure water to configure the initial concentration of iopamidol to be 10 μM, use acid and alkali solution to adjust the initial pH of iopamidol solution to 7.0, add NH to the iopamidol solution 2 Cl, the dosage is 200μM, and UV irradiation is carried out at the same time, and the UV intensity is controlled to be 0, 2.43, 4.94, 7.34 and 9.76mW / cm 2 , and the reaction temperature is controlled at 25°C, the degradation of iopamidol after 300s of reaction is detailed in image 3 .

[0058] Depend on image 3 It can be seen that the intensity of ultraviolet light directly determines the generation rate of free radicals in the system. With the increase of ultraviolet intensity, the photodegradation rate of iopamidol is gradually accelerated. The UV intensity is 9.76mW / cm 2 , the degradation rate of iopamidol reached 99.12% in only 60s. UV / NH 2 The ...

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Abstract

The invention relates to a method for removing iopamidol in water by a UV / NH2Cl combined process. The method comprises the following specific steps of: (1) pretreating a water sample to be treated; and (2) adding an NH2Cl solution into the water sample pretreated in the step (1), adjusting the pH value, and carrying out a photocatalytic oxidation reaction by ultraviolet irradiation to remove iopamidol in the water. According to the method of the invention, the pH value of the reaction water body is adjusted, so that the content of the iopamidol in the water body can be quickly reduced with theremoval effect reaching 99 percent or higher; degradation is quite complete; organic pollutant iopamidol existing in drinking water can be rapidly and effectively reduced; the potential risk of generating high-toxicity iodinated disinfection byproducts can be greatly reduced; the method is simple to operate; reaction conditions of the method are easy to control; used chemical reagents and materials are common products for water treatment, other toxic and harmful substances are not introduced, so that the safety is particularly outstanding; and the reaction conditions are easy to realize.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a UV / NH 2 A combined Cl process for the removal of iopamidol, an emerging organic pollutant in water. Background technique [0002] The research and control of emerging iodinated disinfection by-products (I-DBPs) in drinking water is a hot topic in the field of water treatment. The I-DBPs currently studied mainly refer to iodoacids (I-Acids) and iodotrihalomethanes (I-THMs). Compared with chlorinated and brominated homologues, I-DBPs have greatly enhanced cytotoxicity and genotoxicity to mammalian cells. Iodoacetic acid is currently the most genotoxic disinfection by-product to mammalian cells, about twice as genotoxic as bromoacetic acid. The order of genotoxicity of a haloacetic acid is iodoacetic acid>bromoacetic acid>>chloroacetic acid. Other iodoacetic acids have also been found to be genotoxic, and it has been reported in the literature that iodoacetic ...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/72C02F1/76C02F101/36C02F1/66
CPCC02F1/32C02F1/725C02F1/76C02F2101/36C02F2305/023C02F2305/02C02F1/66
Inventor 田富箱叶文凯赖璠陈晨马世旭
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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