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Preparation method for biomass charcoal/copper magnesium aluminum ternary metal hydroxide nitrogen-phosphorus-removing material

A biochar and hydroxide technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as low adsorption performance, unstable effect, and low removal rate

Inactive Publication Date: 2018-09-14
EAST CHINA JIAOTONG UNIVERSITY
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AI Technical Summary

Problems solved by technology

Nitrogen removal by chemical method may not be able to remove phosphorus and the removal rate is not high. The effect of nitrogen removal by biological method is not stable at the same time. Adsorption method is widely used due to its advantages of high efficiency, rapid operation, simple operation and economy. Adsorbent There are activated carbon, zeolite, and diatomaceous earth, but their adsorption performance is not high and they cannot remove nitrogen and phosphorus at the same time. Studies have found that layered metal hydroxides have the effect of simultaneously adsorbing nitrogen and phosphorus
[0003] In summary, the problems in the prior art are: The adsorption performance of existing adsorbents is not high and cannot remove nitrogen and phosphorus at the same time
Due to the existence of many forms of nitrogen and phosphorus, the proportions of various forms are different under different conditions. If the adsorbent cannot adsorb various forms of nitrogen and phosphorus, the removal efficiency is not high, and because the charges of ammonia nitrogen and phosphorus are opposite , leading to the fact that existing adsorbents can only adsorb one pollutant through electrostatic attraction, so nitrogen and phosphorus cannot be removed at the same time

Method used

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  • Preparation method for biomass charcoal/copper magnesium aluminum ternary metal hydroxide nitrogen-phosphorus-removing material

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preparation example Construction

[0024] Such as figure 1 As shown, the preparation method of the biochar / copper-magnesium-aluminum ternary metal hydroxide nitrogen and phosphorus removal material provided by the embodiment of the present invention includes the following steps:

[0025] S101: Wash the biomass with deionized water for 5 to 10 times, dry it in an oven at 60 to 80°C for 5 hours, place the dried biomass in a tube furnace at a rate of 2 to 10°C / min to Calcination at 400-800°C for 2-6 hours under the protection of nitrogen, and natural cooling to obtain biochar;

[0026] S102: Weigh 25-100 mg of biochar and dissolve it in 100 mL of water, sonicate for 20 minutes to obtain a uniform biochar slurry, then dissolve 0-0.4 g of surfactant in the suspension, and continue to sonicate for 5 minutes to obtain solution A;

[0027]S103: Prepare 100mL alkaline mixed solution B according to a certain ratio, and add it drop by drop into solution A under magnetic stirring until the pH is 9.5-10.5 and maintain for...

Embodiment 1

[0033] a) Cut the bamboo into pieces and wash them with deionized water for 5 times, and dry them in an oven at 60°C for 5 hours. Put the dried biomass in a tube furnace and increase the temperature to 400°C at a rate of 2°C / min. Calcined for 2 hours under the protection of nitrogen, and naturally cooled to obtain biochar.

[0034] b) Weigh 25 mg of biochar and dissolve it in 100 mL of water, and sonicate for 20 minutes to obtain a uniform biochar slurry to obtain solution A.

[0035] c) Press [OH - ] / [CO 3 2- ] = 3.2, [CO 3 2- ] / [Al 3+ ] = 2 to prepare 100 mL of mixed solution B of sodium carbonate and sodium hydroxide, and added drop by drop to solution A under magnetic stirring until the pH was 9.5 and maintained for 10 min.

[0036] d) Prepare 100mL mixed solution C of copper chloride, magnesium chloride and aluminum chloride according to the molar ratio of 0.5:2.5:1, and mix solution C with the mixed solution B at a rate of 2 drops / s with a constant pressure funnel ...

Embodiment 2

[0039] a) The bamboo was cut into pieces and washed 6 times with deionized water, dried in an oven at 65°C for 5 hours, and the dried biomass was placed in a tube furnace to raise the temperature to 500°C at a rate of 4°C / min. Calcined for 3 hours under the protection of nitrogen, and naturally cooled to obtain biochar.

[0040] b) Weigh 35 mg of biochar and dissolve it in 100 mL of water, sonicate for 20 minutes to obtain a uniform biochar slurry, then dissolve 0.1 g of benzenesulfonic acid in the above suspension, and continue to sonicate for 5 minutes to obtain solution A.

[0041] c) Press [OH - ] / [CO 3 2- ] = 3.2, [CO 3 2- ] / [Al 3+ ] = 2 to prepare 100 mL of mixed solution B of sodium carbonate and sodium hydroxide, and added drop by drop to solution A under magnetic stirring until the pH was 9.5 and maintained for 10 min.

[0042] d) Prepare 100mL mixed solution C of copper nitrate, magnesium chloride and aluminum chloride according to the molar ratio of 0.5:2.5:1,...

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Abstract

The invention belongs to the technical field of water pollution control materials, and discloses a preparation method for a biomass charcoal / copper magnesium aluminum ternary metal hydroxide nitrogen-phosphorus-removing material. The nitrogen-phosphorus-removing material is composed of biomass charcoal and a copper magnesium aluminum ternary metal hydroxide; the biomass charcoal is formed by performing carbonization by using biomass as a raw material; and the copper magnesium aluminum ternary metal hydroxide is a nanoscale two-dimensional sheet-shaped ternary metal hydrotalcite hydroxide, thesheet-shaped thickness is 10 nm to 50 nm, and a molar ratio of copper to magnesium to aluminum is (0.5-1.5):(2.5-1.5):1. According to the preparation method for the biomass charcoal / copper magnesium aluminum ternary metal hydroxide nitrogen-phosphorus-removing material provided by the invention, the material preparation process is simple and controllable, the adsorption performance is improved through a double adsorption effect of the biomass charcoal / copper magnesium aluminum ternary metal hydroxide, and the purpose of removing nitrogen and phosphorus is achieved; and nitrogen and phosphoruswastewater is removed by experimental simulation, and results show that the nitrogen removing rate reaches 75.2% and the phosphorus removing rate is up to 95.3%; and the method provides reliable theoretical and practical support for practical applications.

Description

technical field [0001] The invention belongs to the technical field of water pollution control materials, and in particular relates to a preparation method of a biomass charcoal / copper-magnesium-aluminum ternary metal hydroxide material for removing nitrogen and phosphorus. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: With the continuous development of industrialization and the continuous improvement of human living standards, the discharge of industrial wastewater and domestic sewage has increased year by year, making environmental pollution more and more serious. What is worse is that drinking water sources such as lakes and reservoirs are also polluted. The harsh situation of eutrophication often occurs and is difficult to deal with, which not only affects the image of the city and the ecological environment, but also poses a great threat to human health. The main cause of water eutrophication is that t...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/10C02F101/16
CPCB01J20/24B01J2220/4812C02F1/286C02F2101/105C02F2101/16
Inventor 胡锋平王敏邱风仙彭小明张涛戴红玲罗文栋
Owner EAST CHINA JIAOTONG UNIVERSITY
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