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Preparation and application of adsorption-catalysis bifunctional material capable of synchronously removing COD (Chemical Oxygen Demand), antibiotics and phosphorus in aquaculture sewage

A bifunctional material and aquaculture sewage technology, which is applied in the field of bifunctional material preparation and water treatment, can solve the problems of unreasonable application of antibiotics, reduction of various pollutants in aquaculture sewage, excessive consumption, etc.

Pending Publication Date: 2022-08-09
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Aquaculture wastewater is one of the typical difficult-to-treat wastewater, in which the concentration of organic matter is high, COD is as high as 3000-12000 mg / L, and it contains a large amount of nitrogen and phosphorus. In addition, due to the unreasonable application of antibiotics and excessive consumption in the aquaculture industry, resulting in The problem of antibiotic residues, so it is very important to develop an effective, low-cost, sustainable and environmentally friendly treatment of organic matter, phosphorus and antibiotics in aquaculture wastewater
Due to the characteristics of small size effect, quantum size effect and surface interface effect of nanomaterials, they obviously show different characteristics from traditional materials in terms of catalysis and adsorption, and have shown good application prospects in the field of water treatment. Little work has been done to simultaneously reduce multiple pollutants in aquaculture wastewater

Method used

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  • Preparation and application of adsorption-catalysis bifunctional material capable of synchronously removing COD (Chemical Oxygen Demand), antibiotics and phosphorus in aquaculture sewage
  • Preparation and application of adsorption-catalysis bifunctional material capable of synchronously removing COD (Chemical Oxygen Demand), antibiotics and phosphorus in aquaculture sewage
  • Preparation and application of adsorption-catalysis bifunctional material capable of synchronously removing COD (Chemical Oxygen Demand), antibiotics and phosphorus in aquaculture sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 250 g of melamine into a 500 mL alumina crucible with a lid, and place the crucible in a muffle furnace at 2 °C min. -1 The temperature was slowly raised to 600 °C at a rate of 4 h and kept at this temperature for 4 h. After natural cooling, the light yellow blocky solid was taken out and ground into powder to obtain a calcined g-C 3 N 4 (like figure 1 shown in (a)); the g-C calcined once 3 N 4 Put it back into the muffle furnace at 8 ℃·min -1 The temperature was raised to 550 °C at a rate of 2 h, and the temperature was maintained for 2 h. After natural cooling, the product was taken out, and finally light yellow powdery ultrathin carbon nitride nanosheets g-C were obtained. 3 N 4 (like figure 1 shown in (b)). can clearly see figure 1 The primary calcined g-C exhibited by (a) in 3 N 4 It is a two-dimensional overall lamellar structure with a fluffy and rough surface; figure 1 (b) of the ultrathin carbon nitride nanosheets g-C 3 N 4 It is a more "frag...

Embodiment 2

[0038] Accurately weigh 3 g of the ultrathin carbon nitride nanosheets g-C prepared in Example 1 3 N 4 (which was obtained after the first and second calcinations), 1.083 g La (NO 3 ) 3 ·6H 2 O and 0.9607 g of citric acid (as a protective agent) were added to 100 ml of 50% ethanol solution, and stirred magnetically for 30 min; quickly added 20 ml of 0.2 mol·L to the beaker. -1 The KOH solution was again magnetically stirred for 30 min, and then transferred to a 250 mL hydrothermal reactor, reacted in a 200 ℃ oven for 10 h, cooled to room temperature, and the product was taken out (the product here refers to g-C 3 N 4 , La(NO 3 ) 3 ·6H 2 O, citric acid, ethanol solution and KOH solution were mixed and then added to the hydrothermal reactor, and the product was obtained by reacting in an oven at 200 °C for 10 h. The product was a solid-liquid mixture without solid-liquid separation). Washed with deionized water for 4 times (that is, washed with absolute ethanol for 4 tim...

Embodiment 3

[0043] In this example, by adding g-C 3 N 4 (that is, the ultrathin carbon nitride nanosheets g-C obtained by the first calcination and the second calcination in Example 1 3 N 4 ), La(OH) 3 and La(OH) 3 -C 3 N 4 The phosphate adsorption capacity of three different materials was investigated, La(OH) in this example 3 -C 3 N 4 The preparation method is the same as that of Example 2. Use potassium dihydrogen phosphate to prepare several 20 mg / L phosphate solutions (50 mL), each weighing 5 mg of g-C 3 N 4 , La(OH) 3 and La(OH) 3 -C 3 N 4 The material was tested, and the adsorption amount of phosphate and the utilization rate of lanthanum were calculated after the adsorption equilibrium. The experimental results see Figure 4 : The saturated adsorption capacity of the three materials is 18.99 mg·g, respectively -1 , 142.39 mg g -1 and 137.78 mg g -1 , g-C 3 N 4 The adsorption capacity is only about 1 / 7 of that of lanthanide materials. The lanthanum content (La...

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Abstract

The invention provides preparation and application of an adsorption-catalysis bifunctional material capable of synchronously removing COD (Chemical Oxygen Demand), antibiotics and phosphorus in aquaculture wastewater, which comprises the following steps: (1) preparation of carbon nitride nanosheets: taking melamine as a precursor, and carrying out high-temperature calcination in a muffle furnace to obtain a faint yellow solid; grinding the solid into powder, and calcining the powder in the muffle furnace to obtain carbon nitride nanosheets (g-C3N4); and (2) preparing the bifunctional material: fully and uniformly mixing the g-C3N4, La (NO3) 36H2O and citric acid in the step (1) in an ethanol solution, adding a KOH solution, continuously stirring, transferring into a hydrothermal reaction kettle, keeping at 180-200 DEG C for 10-12 hours, cooling, cleaning, and drying to obtain La (OH) 3-C3N4. The material has excellent adsorption performance and photocatalytic activity, and has a stable effect in application of synchronously removing COD (Chemical Oxygen Demand), antibiotics and phosphorus in sewage.

Description

technical field [0001] The invention belongs to the technical field of bifunctional material preparation and water treatment, and relates to the preparation and application of an adsorption-catalysis bifunctional material that can simultaneously remove COD, antibiotics and phosphorus in aquaculture sewage. Background technique [0002] Aquaculture wastewater is one of the typical difficult-to-treat wastewaters, in which the concentration of organic matter is as high as 3000-12000 mg / L and contains a large amount of nitrogen and phosphorus. Therefore, it is very important to develop an effective, low-cost, sustainable and environmentally friendly treatment of organic matter, phosphorus and antibiotics in aquaculture wastewater. Due to the small size effect, quantum size effect and surface interface effect of nanomaterials, they obviously show different characteristics from traditional materials in terms of catalysis and adsorption, and have shown good application prospects in...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J20/02B01J20/06B01J20/30C02F1/30C02F1/28C02F9/08C02F101/30C02F101/16C02F103/20C02F101/34C02F101/38
CPCB01J27/24B01J37/082B01J20/02B01J20/06B01J20/3078B01J20/3085C02F1/30C02F1/281C02F9/00C02F2101/30C02F2101/105C02F2305/10C02F2209/08C02F2103/20C02F2101/34C02F2101/38B01J2220/42B01J2220/4812B01J35/39Y02W10/37
Inventor 何世颖印学杰丁陈蔓成家辉冯彦房段婧婧薛利红杨林章
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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