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Preparation method of aged modified zero-valent iron and method for degrading chlorinated organic pollutants by using aged modified zero-valent iron

A technology of organic pollutants and zero-valent iron, which is applied in the field of chemistry to achieve the effect of improving reactivity, enhancing reactivity and improving ability

Active Publication Date: 2019-10-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the modification of zero-valent iron materials to maintain or improve their reactivity

Method used

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  • Preparation method of aged modified zero-valent iron and method for degrading chlorinated organic pollutants by using aged modified zero-valent iron
  • Preparation method of aged modified zero-valent iron and method for degrading chlorinated organic pollutants by using aged modified zero-valent iron
  • Preparation method of aged modified zero-valent iron and method for degrading chlorinated organic pollutants by using aged modified zero-valent iron

Examples

Experimental program
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Embodiment 1

[0026] Embodiment 1: This embodiment provides a method of aging and modifying zero-valent iron material to improve the activity of the material, and at the same time using the aged-modified zero-valent iron to degrade chloramphenicol-containing wastewater under aerobic conditions.

[0027] The room temperature is 18°C, add 250ml of acetic acid-sodium acetate buffer solution to the 250ml reaction bottle, control its pH between 5.5-6.5, blow nitrogen to reduce the dissolved oxygen to 0, add 1g of zero-valent iron with a particle size of 70-80 microns Powder, ultrasonic for 5 minutes, the ultrasonic spectrum is 40kHz.

[0028] Then add 0.5ml of 1M sodium sulfide solution, place on a shaker and shake at 200rpm for 5-30 minutes, take it out, shake well, filter with suction and freeze-dry at -40°C for 1 hour to obtain the modified zero-valent iron product.

[0029] The above materials were placed in a nitrogen atmosphere at 25°C, and the humidity was controlled at 35%, for 24 hours....

Embodiment 2

[0033] Example 2: The room temperature is 18°C, add 250ml of acetic acid-sodium acetate buffer solution to a 250ml reaction bottle, control its pH between 5.5-6.5, blow nitrogen to reduce the dissolved oxygen to 0, add 1g of 70-80 micron particle size Supersonicated zero-valent iron powder for 5 minutes, then added 0.5ml of 1M sodium sulfide solution, placed on a shaker at 200rpm for 5-30 minutes, took it out, shook it well, filtered it with suction and freeze-dried for 1 hour to obtain the modified zero-valent iron product .

[0034] Put the modified zero-valent iron in a nitrogen atmosphere at 15-25°C, control the humidity at 60%, and let it stand for 24 hours. Then take it out in the air, keep the air temperature at 20°C, and the air humidity at 35%, and age for 7 days to obtain aged modified zero-valent iron.

[0035]At room temperature, add 500 mL of deionized water to two 500 mL reaction vessels respectively, stir with a mechanical stirrer, control the rotation speed at...

Embodiment 3

[0036] Example 3: The room temperature is 18°C, add 250ml of acetic acid-sodium acetate buffer solution to a 250ml reaction bottle, control its pH between 5.5-6.5, blow nitrogen to reduce the dissolved oxygen to 0, add 1g of 70-80 micron particle size Supersonicated zero-valent iron powder for 5 minutes, then added 0.5ml of 1M sodium sulfide solution, placed on a shaker at 200rpm for 5-30 minutes, took it out, shook it well, filtered it with suction and freeze-dried for 1 hour to obtain the modified zero-valent iron product .

[0037] The modified zero-valent iron was placed in a nitrogen atmosphere at 25°C and the humidity was controlled at 80% for 24 hours. Then take it out in the air, keep the air temperature at 20°C, and the air humidity at 35%, and age for 7 days to obtain aged modified zero-valent iron.

[0038] At room temperature, add 500 mL of deionized water to three 500 mL reaction vessels respectively, stir with a mechanical stirrer, control the speed at 100 r / min...

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Abstract

The invention belongs to the field of chemistry, and relates to a method for degrading organic pollutants by using modified zero-valent iron. The invention discloses a preparation method of the aged modified zero-valent iron, the preparation method comprises the following steps that (1), at a room temperature of 18 DEG C, 250 ml of acetic acid-sodium acetate buffer solution is added to a 250 ml reaction flask, the pH of the acetic acid-sodium acetate buffer solution is controlled to be between 5.5 to 6.5, dissolved oxygen is reduced to 0 by introducing nitrogen, 1 g of zero-valent iron powderis added, ultrasonic treatment is carried out for 5 minutes, the 0.5ml / mol sodium sulfide solution is added, the mixed solution is placed in a shaking table and oscillated for 5-30 minutes at the speed of 200 rpm, after the mixed solution is taken out and is shook uniformly, suction filtration is carried out, and freeze-drying for 1 hour to obtain a modified zero-valent iron product; (2) the modified zero-valent iron product is placed in a nitrogen atmosphere of 15-25 DEG C for 24 hours, and then the modified zero-valent iron product is taken out naturally aged for 3-10 days in air, and finally, the aged modified zero-valent iron is prepared. According to the method, the aging modified zero-valent iron is used for degrading the chlorinated organic pollutants, so that the cognitive prejudice of zero-valent iron aging inactivation in a traditional technology is broken, and a new idea of improving the zero-valent iron reaction activity and reducing the storage cost by aging treatment isprovided.

Description

technical field [0001] The invention belongs to the chemical field and relates to a method for degrading organic pollutants by using modified zero-valent iron. Background technique [0002] Chlorinated organic compounds are a general term for a series of elemental organic compounds in which the hydrogen atoms in a class of organic compounds are replaced by chlorine atoms, and are composed of carbon or hydrocarbon as the skeleton and chlorine. Its fat solubility is good, and the flammability of the compound decreases with the increase of chlorine atoms. Exist in different gas, liquid and solid state. Widely used in intermediates, solvents and pesticides of chemical synthesis. Solvent emission and its product waste often enter the atmosphere and ocean, causing environmental pollution. Vinyl chloride monomers such as carbon tetrachloride and chloroform are highly toxic to the liver, and some are carcinogenic. Some organochlorine compounds are very stable in the environment,...

Claims

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Application Information

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IPC IPC(8): B22F1/00B01D53/70C02F1/58C02F101/36
CPCB01D53/70C02F1/58C02F2101/36B22F1/145
Inventor 赵珊修齐杨晓薇孙诗文王曙光袁宪正
Owner SHANDONG UNIV
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