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Preparation and application of a kind of nitrate treatment agent

A nitrate and treatment agent technology, applied in special treatment targets, water/sewage treatment, special compound water treatment, etc., can solve the problems of secondary pollution, slow reaction, difficult treatment of concentrated wastewater, etc., and achieve the effect of broad application prospects.

Active Publication Date: 2019-11-15
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly biological methods, reverse osmosis methods, ion exchange methods, metal catalytic reduction methods, etc. for the removal of nitrate in water bodies. Among them, the biological denitrification method has a slow reaction and requires organic matter as an electron donor, which will cause secondary pollution; The operating cost of reverse osmosis method is too high, and it is not selective. While removing nitrate, it may also remove other elements beneficial to human body; the concentrated wastewater produced by ion exchange method is difficult to treat; the reduction of nitrate by catalytic reduction method generally requires The use of precious metals as catalysts, on the one hand, increases the processing cost, and on the other hand, if the catalyst is not selected properly, by-products such as nitrite and ammonia nitrogen will be produced

Method used

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  • Preparation and application of a kind of nitrate treatment agent
  • Preparation and application of a kind of nitrate treatment agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 A kind of preparation method of nitrate treatment agent, specifically comprises the following steps:

[0027] (1) The cotton was washed three times with distilled water and absolute ethanol, and dried at 60°C for later use.

[0028] (2) Weigh 5.94g Zn(NO 3 ) 2 ·6H 2 O, 3mL Ti(SO 4 ) 2 , 4.04g Fe(NO 3 ) 3 9H 2 O in a beaker, add 100ml of distilled water to prepare mixed salt solution A.

[0029] (3) Weigh 12.00g NaOH and 2.67g NaOH 2 CO 3 In a beaker, add 150ml of distilled water to prepare coprecipitant solution B.

[0030] (4) 3g of treated cotton is put into a beaker, and 250ml of distilled water is added at the same time, then the mixed salt solution A and coprecipitant solution B are added dropwise therein simultaneously, and the rate of addition is controlled to be 1 drop per second, while the magnetic force is violently stirred, After the dropwise addition, continue to stir for 30 minutes, sonicate for 10 minutes, and adjust the pH to 9.5-1...

Embodiment 2

[0035] Embodiment 2 A kind of preparation method of nitrate treatment agent, specifically comprises the following steps:

[0036] (1) The cotton was washed three times with distilled water and absolute ethanol, and dried at 60°C for later use.

[0037] (2) Weigh 11.88g Zn(NO 3 ) 2 ·6H 2 O, 6mL Ti(SO 4 ) 2 , 8.08g Fe(NO 3 ) 3 9H 2 O in a beaker, add 200ml of distilled water to prepare a mixed salt solution.

[0038] (3) Weigh 24.00gNaOH and 5.34gNa 2 CO 3 In a beaker, add 300ml of distilled water to prepare coprecipitant.

[0039] (4) Put 4g of treated cotton into a beaker, add 500ml of distilled water at the same time, then drop the mixed salt solution and coprecipitant into it at the same time, control the dropping rate to 1 drop per second, and stir vigorously with magnetic force at the same time. Afterwards, continue to stir for 30 minutes, sonicate for 10 minutes, and adjust the pH to 9.5-10.5.

[0040] (5) Place the obtained suspension in a blast oven at 65°C an...

Embodiment 3

[0042] Embodiment 3 Application of a nitrate treatment agent in water

[0043] Add 0.1g of nitrate treatment agent to a 250mL Erlenmeyer flask, then add 150mL of waste water containing 221mg / L nitrate, shake in a constant temperature water bath at 25°C for 3h. After magnetic separation, the nitrate content in the supernatant was measured, and the calculated nitrate adsorption capacity was 300.06 mg / g, and the nitrate removal rate was 90.34%.

[0044] Add 10mL of distilled water to the nitrate treatment agent obtained after magnetic separation, put it into the photocatalytic reactor, turn on the ultraviolet lamp, react for 0.5h, magnetically separate it, and put it into an oven for drying. Then add 150mL of wastewater containing 221mg / L nitrate, shake in a constant temperature water bath at 25°C for 3h. After magnetic separation, the nitrate content in the supernatant was measured, and the calculated nitrate adsorption capacity was 288.88 mg / g, and the nitrate removal rate was...

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Abstract

The invention discloses the preparation and application of a nitrate treatment agent. In the invention, cotton is used as a template, and zinc-titanium-iron ternary hydrotalcites with biological forms are synthesized by co-precipitation method, and then roasted in a muffle furnace to obtain nitrate treatment agent. The present invention also provides the application of the nitrate treatment agent prepared by the above method in the treatment of nitrate wastewater. The nitrate treatment agent prepared by the method has good adsorption effect on nitrate, is convenient for separation, and has a simple and easy regeneration method, and has broad application prospects in the field of nitrate wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to the preparation and application of a nitrate treatment agent. Background technique [0002] With the continuous development of industry and agriculture, the extensive use of agricultural chemical fertilizers, the discharge of domestic sewage, and the leakage of industrial wastewater have caused more and more serious nitrate pollution in water. Excessive nitrate increases the nutrients in the water body, promotes the vigorous growth of autotrophic organisms, deteriorates the water quality and destroys the ecological environment. Nitrate has strong chemical stability and is not easy to combine with other compounds, but it can be converted into nitrite in the human body. In addition, under the action of various nitrogen-containing organic compounds, nitrate and nitrite will form "three causes" Substances that can cause diseases such as cancer, Keshan diseas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/04B01J20/34C02F1/48C02F1/28C02F1/32B01J21/06B01J23/06B01J23/80C02F101/16
CPCB01J20/043B01J20/06B01J20/3441B01J21/06B01J23/06B01J23/80B01J35/0006B01J35/004C02F1/281C02F1/32C02F1/448C02F2101/163C02F2303/16C02F2305/10
Inventor 程爱华钱大鹏
Owner XIAN UNIV OF SCI & TECH
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