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Preparation of biochar-based catalyst and method for repairing antibiotics by using biochar-based catalyst

A repair method, biochar technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems that have not been reported, and achieve simple preparation methods, mild process conditions, and applicable target substances wide range of effects

Pending Publication Date: 2021-02-26
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, so far, a preparation method of a biochar-based catalyst and its patented technology for constructing a Fenton oxidation technology system with persulfate in the repair method of antibiotics has not been reported.

Method used

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  • Preparation of biochar-based catalyst and method for repairing antibiotics by using biochar-based catalyst
  • Preparation of biochar-based catalyst and method for repairing antibiotics by using biochar-based catalyst
  • Preparation of biochar-based catalyst and method for repairing antibiotics by using biochar-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method using the highly active biochar-based Fenton catalyst is described in detail by this example. In this embodiment, the preparation process is as follows:

[0033] First, put the agricultural waste grapefruit peel in deionized water, repeat 2-3 times to clean the surface impurities, dry it at 75-100 °C to constant weight, grind it through an 80-mesh sieve, and then, under the protection of nitrogen, dry it in a tube furnace. The temperature was raised to 600 °C at 5 °C / min, and the pyrolysis was maintained for 120 min. After natural cooling, the obtained solid was ground and passed through an 80-mesh sieve to obtain pomelo peel biochar. Subsequently, in a three-necked flask, 200 mL of acidic mine wastewater with an iron mass concentration of 0.89-1.02 g / L after filtration and pretreatment was mixed with 10-20 g of pomelo peel biochar for 300-360 min, and then, under nitrogen protection, the The newly prepared pomelo peel extract of a certain concen...

Embodiment 2

[0035] In this example, the single removal and degradation effects of different biochar-based Fenton catalyst materials on tetracycline and norfloxacin are compared. The steps are as follows: add the following five combined materials or reagents to the contaminated water containing tetracycline or norfloxacin Combinations: Persulfate, Biochar, Biochar-Based Fenton Catalyst, Biochar / Persulfate, and Biochar-Based Fenton Catalyst / Persulfate. A 200 mL beaker is used as a reactor, and the treatment object is a water body whose concentration is 100 mL tetracycline concentration of 15 mg / L or norfloxacin concentration of 30 mg / L, the pH of the water body is 4.0, and the dosage of the catalyst material is 1.5 g / L, and The beaker was placed on a stirrer with a rotation speed of 150 rpm and a reaction time of 60 min. Example 2 results are shown in table 1. It can be seen from the table that both persulfate and biochar have low removal rates for tetracycline and norfloxacin, and the com...

Embodiment 3

[0038]The difference from Example 2 is that the pH range is adjusted to 3.0, 4.0, 5.0, 6.0, 7.0, and 8.0, and the tetracycline or norfloxacin is degraded and removed by using a biochar-based Fenton catalyst / persulfate system. Other conditions were the same as in Example 2, and the changes of tetracycline or norfloxacin in the water before and after the reaction were measured. Example 3 results are shown in table 2. It can be seen from the table that the removal rates of tetracycline and norfloxacin all decrease with the increase of pH, and the removal rates under acidic conditions are greater than those under neutral and alkaline conditions, but the removal rates of both are at pH=3.0 and 4.0 , have reached a higher level, therefore, choose pH=4.0 as the optimal pH condition.

[0039]

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Abstract

The invention discloses preparation of a biochar-based catalyst and a method for repairing antibiotics by using the biochar-based catalyst. According to the preparation of the biochar-based catalyst and the method for repairing antibiotics by using the biochar-based catalyst, firstly, pretreated pyrite acidic mine wastewater is taken as a modifier of agricultural waste pomelo peel biochar; then, iron, copper and aluminum ions on the biochar form a high-activity biochar-based zero-valent iron, copper and aluminum ternary metal composite catalyst material under the reduction action of a pomelo peel extracting solution; a novel Fenton oxidation technical system is constructed by the high-activity biochar-based zero-valent iron, copper and aluminum ternary metal composite catalyst material andpersulfate; the novel Fenton oxidation technical system is used for single, synchronous and efficient degradation and removal of water antibiotics tetracycline and norfloxacin, within the reaction time of 60 min, the single removal rates of tetracycline and norfloxacin are as high as 98.85% and 96.52% respectively; and during synchronous removal, the removal rate can also reach 80% or above. In addition, the high-activity biochar-based Fenton catalyst has good stability. According to the method disclosed by the invention, the treatment and recycling of acid mine wastewater and agricultural waste pomelo peel are realized, and the single and synchronous degradation and removal of various antibiotics are also realized.

Description

technical field [0001] The invention relates to the technical field of solid waste and waste water resource utilization and water pollution control in environmental engineering, and in particular relates to the preparation of a biochar-based catalyst and its repair method in antibiotics. Background technique [0002] Adsorption is widely used in the efficient removal of antibiotics in water, and the commonly used adsorbents include activated carbon, kaolin, zeolite, and biochar. Among these adsorbents, the research on biochar is the most popular. Biochar is a product formed by the pyrolysis of biomass raw materials at high temperature and limited oxygen. It has the advantages of wide sources and low cost. The adsorption performance is poor, and it needs to be modified to improve its adsorption performance. Among them, the research on environment-friendly iron salt modification is the most. However, the iron salts currently used are basically commercialized, and the cost is ...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J37/08B01J37/16C02F1/72C02F101/34C02F101/36C02F101/38
CPCB01J23/745B01J37/084B01J37/16C02F1/725C02F1/722C02F2305/026C02F2101/34C02F2101/36C02F2101/38
Inventor 刁增辉钱伟
Owner ZHONGKAI UNIV OF AGRI & ENG
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