Preparation of Fe-Zn and phosphate modified sludge biochar and application of the same in removal of fluoroquinolones antibiotics from water

A technology of fluoroquinolones and biochar, applied in the field of water treatment, can solve problems such as limited adsorption capacity, achieve low cost, simple operation, and achieve the effect of removal

Active Publication Date: 2019-09-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large molecular weight and molecular structure of antibiotics, the adsorption capacity of sludge-based biochar is limited, and the adsorption capacity can be improved by appropriate modification methods
Studies have shown that iron-zinc and phosphoric acid modification can significantly improve the physical and chemical characteristics of biochar and enhance the adsorption capacity of biochar, but there is no report on the combination of the two to modify the sludge biochar system to explore the adsorption of antibiotics

Method used

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  • Preparation of Fe-Zn and phosphate modified sludge biochar and application of the same in removal of fluoroquinolones antibiotics from water
  • Preparation of Fe-Zn and phosphate modified sludge biochar and application of the same in removal of fluoroquinolones antibiotics from water
  • Preparation of Fe-Zn and phosphate modified sludge biochar and application of the same in removal of fluoroquinolones antibiotics from water

Examples

Experimental program
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Effect test

example 1

[0047] Example 1: Centrifuge and dehydrate the municipal sludge in the secondary sedimentation tank, dry it in a blast drying oven at 70°C to constant weight, grind it, and place it in N 2 Pyrolysis at 500°C for 2h in a tube furnace with a flow rate of 1 L / min and a temperature rise rate of 10°C / min, ground and sieved (0.15mm) to obtain SBC. SBC added with dissolved FeCl 3 ·6H 2 O: ZnCl 2 =3:1 solution for 24 h, 100 ° C drying, repeat the above loading process 3 times to increase the loading capacity of iron and zinc, transfer to a tube furnace and calcined under the above conditions for 2 h, to obtain Fe / Zn-SBC. Add the above Fe / Zn-SBC to H 3 PO 4 Medium (SBC: H 3 PO 4 =1:5) soaked for 10h, placed in a muffle furnace with a temperature rise rate of 10°C / min, activated at 450°C for 1h, washed with deionized water until the pH of the filtrate was constant, dried at 70°C, ground and sieved (0.15 mm), get Fe / Zn+H 3 PO 4 -SBC, stored in a desiccator protected from light. ...

example 2

[0048] Example 2: Add SBC to the antibiotic solution with a concentration of 10mg / L, the dosage of SBC is 0.5g / L, react in a constant temperature shaking box at 25°C, and take samples at the set time to determine the residual of CIP, NOR and OFL Concentration, calculated adsorption capacity and removal rate.

[0049] Depend on figure 1 It can be seen that when SBC is used as an adsorbent, its adsorption capacity for CIP, NOR, and OFL is 0.60-11.27mg / g at reaction equilibrium, and its removal rate is 1.32-55.87%, and its removal ability for CIP is the strongest.

example 3

[0050] Example 3: Fe / Zn-SBC was added to the antibiotic solution with a concentration of 10mg / L, the dosage of Fe / Zn-SBC was 0.5g / L, and the reaction was carried out in a constant temperature shaking box at 25°C, and samples were taken at the set time Determine the residual concentration of CIP, NOR and OFL, and calculate the adsorption capacity and removal rate.

[0051] Depend on figure 2 It can be seen that when Fe / Zn-SBC is used as the adsorbent, the adsorption capacity and removal rate of CIP, NOR, and OFL increase with time, and the adsorption capacity is 7.29-13.35 mg / g when the reaction is balanced, and the removal rate is 36.43-67.81 %, the adsorption capacity was significantly higher than that of SBC, and it had the strongest removal capacity for CIP.

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Abstract

Belonging to the technical field of biochar preparation, the invention discloses preparation of Fe-Zn and phosphate modified sludge biochar and application of the same in removal of fluoroquinolones antibiotics from water. The preparation method includes: dewatering and drying the sludge from a secondary sedimentation tank of a municipal sewage treatment plant, then performing pyrolysis by a hightemperature tubular furnace, then utilizing Fe-Zn and phosphate for modification, and finally conducting two calcining to obtain Fe/Zn+H3PO4-SBC. The Fe/Zn+H3PO4-SBC prepared by the invention has adsorption capacity on fluoroquinolones antibiotics ciprofloxacin, norfloxacin and ofloxacin up to 25.43-88.73mg/g. The method provided by the invention adopts municipal sludge as the raw material, reduces the production cost, realizes the resource utilization of municipal sludge and efficient removal of antibiotics from water, also has the advantages of simple operation, low cost and the like, and isa potential removal method for fluoroquinolones antibiotics in water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for removing antibiotics in water by using iron-zinc and phosphoric acid-modified sludge biochar as an adsorbent. Background technique [0002] Since the appearance of penicillin in 1929, the use of antibiotics has exploded in order to improve and protect the health of humans and animals. Antibiotics have broad-spectrum antibacterial activity and good bactericidal effect, and are widely used to treat bacterial infections. According to market survey results, China has become the world's largest producer and consumer of antibiotics. Antibiotics ingested by humans and animals cannot be completely metabolized and absorbed, and about 50%-90% are excreted through urine and feces in the form of original compounds or metabolites, and natural attenuation and traditional sewage treatment technologies are difficult to effectively remove It is completely remove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/36C02F101/38C02F101/34
CPCB01J20/20B01J20/3078B01J20/3085C02F1/288B01J2220/4887C02F2101/36C02F2101/38C02F2101/34
Inventor 张祖麟马永飞杨列吴丽柯柏明林思萌
Owner WUHAN UNIV OF TECH
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