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Artificially synthesized ferrihydrite and application method of artificially synthesized ferrihydrite in novel light-Fenton system

A technology of artificial synthesis and application method, which is applied in the direction of chemical instruments and methods, water treatment of special compounds, water pollutants, etc. It can solve the problems of narrow pH application range and large amount of iron sludge, so as to broaden the range of pH value and reduce iron pollution. Slime generation, speed-up effects

Inactive Publication Date: 2020-04-17
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the light-Fenton method also has the traditional Fenton disadvantages of the subsequent treatment of iron ions after sewage treatment.
[0005] Therefore, there is an urgent need for a technology that can overcome the shortcomings of the traditional Fenton method, such as the narrow pH range and the generation of a large amount of iron sludge.

Method used

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  • Artificially synthesized ferrihydrite and application method of artificially synthesized ferrihydrite in novel light-Fenton system
  • Artificially synthesized ferrihydrite and application method of artificially synthesized ferrihydrite in novel light-Fenton system
  • Artificially synthesized ferrihydrite and application method of artificially synthesized ferrihydrite in novel light-Fenton system

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Weigh 40.0g Fe(NO 3 ) 3 9H 2 O was dissolved in 500mL deionized water, and a KOH solution with a concentration of 1mol / L was added at a rate of 100mL / min, and the pH of the solution was adjusted to about 7.5 with 1mol / L KOH, and vigorously stirred for 1h. Centrifuge at a speed of 12 minutes for 12 minutes, discard the supernatant, wash the obtained solid with deionized water, shake well, and centrifuge at a speed of 4000 rpm for 12 minutes, discard the supernatant, repeat this 5 times and then store at 40°C After drying, the artificially synthesized ferrihydrite can be obtained.

[0034] The crystal structure of the artificially synthesized ferrihydrite was analyzed by X-ray diffraction (XRD).

[0035] The measurement conditions are: XRD is carried out by tablet method at 40kV voltage and 100mA current, 2θ / θ coupled continuous scanning, 0.02° step width, and scanning speed of 10° / min. The result is as figure 1 shown. There are two broad peaks of weaker intensity i...

Embodiment 2

[0037] at 2.0 mmol L -1 Take 10mL of the BPA stock solution and place it in a 1L beaker, successively from 50mmol L -1 Pipette 10, 20, 30, 40, 50mL solutions from the EDDS stock solution into the beaker (the concentration of EDDS in the mixed system is 0.5, 1.0, 1.5, 2.0, 2.5mmol L -1 ), then add 0.6g ferrihydrite (prepared in Example 1) to the beaker, aerate it to fully complex, dilute to close to one liter, after it is fully mixed, adjust the pH to 7.0±0.1, then add 50 μL HO 2 o 2 Solution (30%, density 1.13g / cm 3 ), H 2 o2 The concentration of the solution in the mixed system is 0.5mmolL -1 , and then transferred to a 1000mL volumetric flask to constant volume, and then poured into a metal halide light catalytic reactor, and the timing was started when it was irradiated. At 0, 10, 30, 60, 120, 240, and 360 minutes, take 1.0mL water samples with a pipette gun for measurement, and the results are as follows figure 2 shown.

Embodiment 3

[0039] at 2.0 mmol L -1 Take 10mL of the BPA stock solution and place it in a 1L beaker, from 50mmol L -1 Pipette 20mL solution from the EDDS stock solution into the beaker (the concentration of EDDS in the mixed system is 1.0mmol L -1 ), then successively add 0.2, 0.4, 0.6, 0.8, 1.0g of ferrihydrite (prepared in Example 1) to the beaker, aerate to make it fully complexed, dilute to nearly one liter, and after it is fully mixed, Adjust the pH to 7.0 ± 0.1, then add 50 μL of HO 2 o 2 Solution (30%, density 1.13g / cm 3 ),H 2 o 2 The concentration of the solution in the mixed system is 0.5mmolL -1 , and then transferred to a 1000mL volumetric flask to constant volume, poured into a metal halide light catalytic reactor, and started timing when irradiated. At 0, 10, 30, 60, 120, 240, and 360 minutes, take 1.0mL water samples with a pipette gun for measurement, and the results are as follows image 3 shown.

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Abstract

The invention discloses artificially synthesized ferrihydrite and an application method of the artificially synthesized ferrihydrite in a novel light-Fenton system. The preparation method of the ferrihydrite comprises the following steps: dissolving Fe(NO3)3.9H2O in deionized water, adding a KOH solution, adjusting the pH value to 7.4-7.6, stirring, carrying out centrifugal treatment on obtained colloid, removing the supernatant, washing the obtained solid with deionized water, uniformly shaking, carrying out centrifugal treatment, removing the supernatant, repeatedly performing the operationfive times, and drying at 40 DEG C. The application method of the ferrihydrite in the novel photo-Fenton system comprises the following steps: 1) putting a target pollutant BPA into a beaker; 2) adding carboxylic acid into the beaker; 3) adding ferrihydrite; 4) adding hydrogen peroxide; and 5) finally adding visible light to form a ferrihydrite-carboxylic acid / light-Fenton system for degradation of BPA. According to the method, the ferrihydrite and the carboxylic acid are introduced into the light-Fenton system, so that the defects of high iron sludge yield and narrow pH application range of the traditional homogeneous Fenton technology are overcome, the use amount of the hydrogen peroxide oxidant is reduced, and the method has the characteristics of economy and environmental friendlinessand has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and treatment, in particular to an artificially synthesized ferrihydrite and an application method thereof in a novel light-Fenton system. Background technique [0002] Environmental endocrine disrupting compounds (EDCs) are a class of exogenous harmful chemical substances that can affect the internal stability of the body and widely exist in the environment. Through the predation of organisms, EDCs enter the body through the digestive system, destroying the mechanism of endogenous hormones in the body, thereby affecting the normal growth and reproduction of organisms. China mainly uses surface water as the main drinking water. Therefore, reducing or removing EDCs in surface water is very important for human life and health. BPA is an estrogen-like substance, a representative EDCs, and one of the most widely used chemical products. Its impact on the human body is a cumulative an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/30B01J23/745C02F101/30
CPCB01J23/745C02F1/30C02F1/722C02F1/725C02F2101/305C02F2305/026C02F2305/10
Inventor 谢宏杰罗梦琦吴忆黄闻宇朱红祥王双飞
Owner GUANGXI UNIV
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