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Preparation method and application of activated sludge-graphene oxide composite material

A technology of graphene oxide and activated sludge, which is applied in the field of environmental governance, can solve the problems such as the difficulty in reusing the chemical composition of activated sludge, and the lack of a good method for immobilizing activated sludge.

Inactive Publication Date: 2019-09-06
HUNAN INST OF TECH
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Problems solved by technology

Activated sludge (AS) is difficult to reuse due to its complex chemical composition, which will cause a large number of by-products
Immobilized activated sludge has the characteristics of easy separation, easy control, easy recovery, and high stability, which can better maintain the adsorption capacity of activated sludge. Therefore, immobilization technology is very important to improve the practical application of adsorbents, but there is no Very good activated sludge immobilization method

Method used

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  • Preparation method and application of activated sludge-graphene oxide composite material
  • Preparation method and application of activated sludge-graphene oxide composite material
  • Preparation method and application of activated sludge-graphene oxide composite material

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Embodiment 1

[0030] The present invention adopts the immobilization method of activated sludge and graphene oxide, uses graphene oxide as immobilized carrier material, has prepared a kind of novel activated sludge-graphene oxide composite adsorbent, and its preparation process is as follows:

[0031] Step 1: Obtain activated sludge, grind it and centrifuge it for later use;

[0032] Step 2, dissolving the sodium seaweed in deionized water to obtain a sodium seaweed solution with a final concentration of 20 g / L;

[0033] Step 3, the graphene oxide powder is added to the sodium alginate solution to obtain a fixation solution, and the solid-to-liquid ratio of the graphene oxide powder to the embedding agent solution is 0.1:1;

[0034] Step 4, join activated sludge (wet weight, water content 95%) in the fixed solution, stir to obtain mixed solution; The solid-liquid ratio of activated sludge and fixed solution is 0.06:1;

[0035] Step 5. Gradually drop the mixed solution into the calcium chlo...

Embodiment 2

[0038] 1. The morphology of AS, GO and AS-GO samples is shown in Figure 1. As can be seen from Fig. 1, the image of AS showed that the sludge surface was a leaf cluster structure with a rough surface, and many rod-shaped and spherical bacteria were clearly observed on the surface of AS. The SEM images of GO supports show that GO has a highly wrinkled structure with a lateral size of several nanometers, randomly aggregated and closely combined to form a disordered solid. Compared with the pristine AS and GO samples, the SEM micrographs of the AS-GO samples showed obvious shape changes, and the AS samples were tightly covered and embedded in the GO samples due to the immobilization process. This indicates that GO is a well-supported carrier for AS, and AS-GO has a rough and relatively dense surface, which can improve stability and avoid the erosion of radionuclides and heavy metals.

[0039] 2. The adsorption effect of AS-GO on uranium in the pH range of 2-7 is as follows: im...

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Abstract

The invention provides a preparation method of an activated sludge-graphene oxide composite material (AS-GO). The adsorption characteristics of activated sludge (AS) and graphene oxide (GO) are sufficiently used. The novel activated sludge-graphene oxide composite adsorbent (AS-GO) is prepared by adopting an immobilization method of activated sludge (AS) and graphene oxide (GO) with the graphene oxide (GO) as an immobilization carrier material.

Description

technical field [0001] The invention belongs to the field of environmental management, in particular to a preparation method and application of an activated sludge-graphene oxide composite material. Background technique [0002] With the increase of uranium mining industry year by year, the discharge of uranium-containing wastewater has become a key treatment object in environmental pollution and prevention. Therefore, it is urgent to find and prepare adsorbents that can efficiently adsorb and remove radioactive element uranium. So far, the technologies used to remove uranium in water mainly include membrane separation, photocatalytic degradation, chemical precipitation, evaporation, adsorption and other methods. Among these methods, the adsorption method has relatively simple operation, low cost, high efficiency and fewer harmful secondary products, it is considered to be an effective and widely used method for treating heavy metal wastewater. [0003] Activated sludge is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/20
CPCB01J20/0203B01J20/20B01J2220/4887C02F1/281C02F1/283C02F2101/20
Inventor 周唯刘安民廖可兵陈雪林
Owner HUNAN INST OF TECH
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