Modified magnetic sludge biological carbon and preparation method and applications thereof

A biochar and magnetic technology, applied in the field of materials, can solve the problems of poor adsorption and removal ability, limited adsorption sites, secondary pollution of water body, etc., achieve strong removal ability, many adsorption sites, and reduce production costs

Active Publication Date: 2017-09-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small specific surface area, the unmodified sludge biochar can provide limited adsorption sites, so the ability to adsorb and remove pollutants such as organic matter and heavy metals in wastewater is poor.
Moreover, because the remaining sludge contains more heavy metals, the direct application of untreated sludge biochar may cause secondary pollution to the water body, and, because the particle size of the biochar is small, it is difficult to recover from the water body, which may cause Cause secondary pollution, which limits its application to a certain extent

Method used

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  • Modified magnetic sludge biological carbon and preparation method and applications thereof
  • Modified magnetic sludge biological carbon and preparation method and applications thereof
  • Modified magnetic sludge biological carbon and preparation method and applications thereof

Examples

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Effect test

Embodiment 1

[0046] A modified magnetic sludge biochar is prepared from residual sludge after carbonization, alkali modification and acid modification. The modified magnetic sludge biochar includes biochar and iron compound particles, wherein the iron compound particles are γ-iron trioxide particles and iron oxyhydroxide particles.

[0047] In this embodiment, the atomic percentage of iron in the modified magnetic sludge biochar is 1.05%.

[0048] In this example, the specific surface area of ​​the modified magnetic sludge biochar is 202m 2 / g, the pore volume is 0.2563m 3 / g.

[0049] A method for preparing the modified magnetic sludge biochar of this embodiment described above includes the following steps:

[0050] (1) Pretreatment of surplus sludge: the surplus sludge is dried, crushed, and passed through a 120-mesh sieve to obtain powdery surplus sludge, which is used as a raw material for preparing magnetic sludge biochar.

[0051] (2) Preparation of magnetic sludge biochar: Put the powdery su...

Embodiment 2

[0066] A modified magnetic sludge biochar is basically the same as the modified magnetic sludge biochar of Example 1, except that the specific surface area and pore volume of the modified magnetic sludge biochar of Example 2 are 140.469m, respectively. 2 / g and 0.1778m 3 / g.

[0067] A method for preparing the modified magnetic sludge biochar of this embodiment described above includes the following steps:

[0068] (1) Pretreatment of surplus sludge: the surplus sludge is dried, crushed, and passed through a 120-mesh sieve to obtain powdery surplus sludge, which is used as a raw material for preparing magnetic sludge biochar.

[0069] (2) Preparation of magnetic sludge biochar: Put the powdery surplus sludge obtained in step (1) in a tube furnace, and under the protection of flowing nitrogen, the temperature rises from room temperature at a heating rate of 5°C / min It is carbonized at a constant temperature of 800°C for 2 hours, and taken out after natural cooling to obtain magnetic s...

Embodiment 3

[0074] A modified magnetic sludge biochar, which is basically the same as the modified magnetic sludge biochar of Example 1, except that the specific surface area and pore volume of the modified magnetic sludge biochar of Example 3 are 180.917m respectively. 2 / g and 0.2265m 3 / g.

[0075] A method for preparing the modified magnetic sludge biochar of this embodiment is basically the same as the preparation method of Example 1, except that the step (3.2) of the preparation method of Example 3 uses a commercially available glacial acetic acid solution (Concentration is 17mol / L) for acid modification.

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Abstract

The invention discloses a modified magnetic sludge biological carbon and a preparation method and applications thereof. The modified magnetic sludge biological carbon is prepared by carbonizing residual sludge, modifying sludge by alkali, and modifying sludge by acid. The provided modified magnetic sludge biological carbon has the advantages of good magnetic property, large specific surface and pore volume, abundant pore structure, many surface adsorption functional groups and adsorption sites, and strong performance on removing target pollutants; and the preparation method has the advantages of simple preparation, easy operation, low cost, high production efficiency, and convenience for large scale production. The provided modified magnetic sludge biological carbon is used to remove tetracycline hydrochloride in water for the first time, has the advantages of large adsorption amount, strong adsorption performance, high adsorption efficiency, simple and convenient operation, short processing period, low processing cost, and easy separation and recovery, and has a strong performance on removing tetracycline hydrochloride. The maximal balance adsorption amount can reach 253.8 mg / g. The performance of the biological carbon is obviously stronger than that of unmodified magnetic sludge biological carbon.

Description

Technical field [0001] The invention belongs to the technical field of materials and the field of organic pollutant treatment, and relates to a modified magnetic sludge biochar and a preparation method and application thereof, in particular to an alkali-acid modified magnetic sludge biochar and a preparation method thereof. Application in the removal of tetracycline hydrochloride in water. Background technique [0002] Tetracycline hydrochloride is a broad-spectrum tetracycline antibiotic, which has been widely used in Linchuan medicine and aquaculture for a long time. Tetracycline hydrochloride has a large solubility in water, is not easy to be biodegraded in the environment, is easy to store and accumulate in the water environment, and has significant mutagenicity, preparation effects and embryo toxicity, and can produce huge ecological toxicological effects. Human health poses a serious threat. The current methods for removing tetracycline hydrochloride in water mainly inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/38C02F101/34
Inventor 汤琳余江芳庞娅曾光明邓垚成王佳佳彭博魏雪王佩
Owner HUNAN UNIV
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