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Preparation of an iron-zinc and phosphoric acid modified sludge biochar and its application in the removal of fluoroquinolone antibiotics in water
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A technology of fluoroquinolones and quinolones, which is applied in the field of removing antibiotics in water, can solve problems such as limited adsorption capacity, and achieve the effects of low cost, reduced harm, and simple operation
Active Publication Date: 2022-07-19
WUHAN UNIV OF TECH
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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
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example 1
[0047] Example 1: Centrifugal dehydration of municipal sludge in secondary sedimentation tank, place it in a blast drying oven at 70°C to dry to constant weight, grind it, and place it in a N 2 The flow rate was 1 L / min, and the temperature rising rate was 10° C. / min in a tube furnace for pyrolysis at 500° C. for 2 hours, and then ground and sieved (0.15 mm) to obtain SBC. SBC is added with dissolved FeCl 3 ·6H 2 O: ZnCl 2 =3:1 solution was shaken for 24h, dried at 100°C, the above loading process was repeated 3 times to increase the loading of iron and zinc, transferred to a tube furnace and calcined under the above conditions for 2h to obtain Fe / Zn-SBC. Adding 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) to obtain Fe / Zn+H 3 PO 4 ...
example 2
[0048] Example 2: SBC was added to the antibiotic solution with a concentration of 10 mg / L, the dosage of SBC was 0.5 g / L, the reaction was carried out in a constant temperature shaking box at 25°C, and the residues of CIP, NOR and OFL were measured by sampling at the set time. concentration, and the adsorption capacity and removal rate were calculated.
[0049] Depend on figure 1 It can be seen that when SBC is used as the adsorbent, the adsorption capacity of CIP, NOR and OFL is 0.60-11.27 mg / g, the removal rate is 1.32-55.87%, and its removal capacity for CIP is the strongest.
example 3
[0050] Example 3: Add Fe / Zn-SBC to an antibiotic solution with a concentration of 10 mg / L, the dosage of Fe / Zn-SBC is 0.5 g / L, react in a constant temperature shaking box at 25°C, and take samples at a set time The residual concentrations of CIP, NOR and OFL were determined, and the adsorption capacity and removal rate were calculated.
[0051] Depend on figure 2 It can be seen that with Fe / Zn-SBC as the adsorbent, the adsorption capacity and removal rate of CIP, NOR, and OFL increased with time, and the adsorption capacity was 7.29-13.35 mg / g at the reaction equilibrium, and the removal rate was 36.43-67.81 %, the adsorption capacity was significantly higher than that of SBC, and its removal capacity for CIP was the strongest.
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Abstract
The invention discloses the preparation of iron-zinc and phosphoric acid modified sludgebiochar and its application in the removal of fluoroquinolone antibiotics in water, and belongs to the technical field of biochar preparation. The preparation method is as follows: after dewatering and drying the sludge in the secondary sedimentation tank of the municipal sewage treatment plant, pyrolysis is carried out in a high-temperature tubular furnace, then it is modified by iron zinc and phosphoric acid, and finally Fe / Zn+H is obtained by secondary calcination. 3 PO 4 ‑SBC. Fe / Zn+H prepared by the present invention 3 PO 4 The adsorption capacity of ‑SBC to fluoroquinolone antibioticsciprofloxacin, norfloxacin and ofloxacin in water can reach 25.43‑88.73 mg / g. The municipal sludge of the invention reduces the production cost as a raw material, not only realizes the resource utilization of the municipal sludge and the efficient removal of antibiotics in water, but also has the advantages of simple operation, low cost and the like, and is a highly effective fluoroquinolone antibiotic in water. Potential removal method.
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 advent of penicillin in 1929, in order to improve and protect the health of humans and animals, the use of antibiotics has exploded. Antibiotics have broad-spectrum antibacterial activity and good bactericidal effect and are widely used in the treatment of 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 completel...
Claims
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