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Method for determining hydroxyl free radicals of ozone system

A technology of free radicals and ozone, applied in the field of water treatment, can solve problems affecting the accuracy of measuring hydroxyl radicals and achieve accurate measurement results

Inactive Publication Date: 2016-09-28
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, the removal of atrazine by ozone molecules will also affect the accuracy of measuring the concentration of hydroxyl radicals

Method used

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  • Method for determining hydroxyl free radicals of ozone system
  • Method for determining hydroxyl free radicals of ozone system
  • Method for determining hydroxyl free radicals of ozone system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Experimental group: Add DEA=1μmol / L, H 2 o 2 =10μmol / L, ozone=20μmol / L, pH=7, T=20±1℃

[0046] Control group: Add pCBA=1μmol / L, H 2 o 2=10 μmol / L, ozone=20 μmol / L, pH=7, T=20±1°C.

[0047] For the CT obtained by using two indicators pCBA and DEA O3 , CT ·OH and R ct value for comparison.

[0048] Under three water quality conditions, the CT of pCBA and DEA O3 worth seeing figure 1 . like figure 1 As shown, in ultrapure water, the CT of pCBA O3 The value is 48% of DEA; in tap water, the CT of pCBA O3 Value is 81% of DEA; CT of both in sewage O3 basically the same. Because the hydroxyl radical capture ability of sewage is strong, the influence of hydroxyl radical chain reaction brought by pCBA on ozone decay is weakened, so the CT obtained by pCBA and DEA in sewage O3 The values ​​are basically the same. This shows that in the water quality with weak ability to capture hydroxyl radicals, the CT obtained by using pCBA as an indicator O3 The value is smalle...

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Abstract

The invention belongs to the field of water treatment, and particularly relates to a method for determining hydroxyl free radicals in an ozone system. The invention provides a new indicator, namely Deethylatrazine (DEA); the reaction rate of the DEA with ozone is very low, and the reaction rate of the DEA with free radicals is very high, so that the concentration of the hydroxyl free radicals (.OH) in the ozone system can be determined more accurately. Compared with a method for determining the hydroxyl free radicals in the ozone system by using the conventional hydroxyl free radical indicator namely para-chlorobenzoic acid (pCBA), the method provided by the invention can be used for determining the concentration of the hydroxyl free radicals more accurately, and can be applied to various types of water qualities, particularly to the water quality with lower free radical capturing capacity.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a method for measuring hydroxyl radicals in an ozone system. Background technique [0002] Ozone oxidation technology is widely used in water treatment, mainly because ozone can decompose and generate hydroxyl radicals during the oxidation process. In order to better understand the oxidation mechanism in the ozone oxidation process, the quantification of hydroxyl radicals cannot be ignored. Accurate determination of the concentration of hydroxyl radicals is of great help to evaluate the oxidation efficiency of ozone and optimize the process of ozone oxidation. However, hydroxyl radicals are difficult to be directly measured in aqueous solution because of their extremely high reactivity in aqueous solution, resulting in very low steady-state concentrations, usually less than 10 -12 M. In current research, the determination of hydroxyl radicals mainly adopts electron spin resonance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78G01N33/00
CPCC02F1/78C02F2209/23C02F2305/023G01N33/00
Inventor 李继杨兢欣马军李婷婷
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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