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Modified biochar based composite Fenton catalyst and pollution treatment method

A treatment method and biochar technology, applied in the field of organic pollution treatment, can solve the problems of human health impact, water pollution and ecological environment, etc., and achieve the effects of low price, abundant resources, and improved degradation efficiency

Inactive Publication Date: 2019-04-19
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the water pollution problem caused by the massive discharge of organic pollutants such as dyes, pesticides, and antibiotics has seriously affected the ecological environment and human health.

Method used

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  • Modified biochar based composite Fenton catalyst and pollution treatment method
  • Modified biochar based composite Fenton catalyst and pollution treatment method
  • Modified biochar based composite Fenton catalyst and pollution treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0030] Embodiment 1-1: Preparation of composite Fenton-like catalyst

[0031] Add 200g of biochar to 1L of copper sulfate solution with a concentration of 4.8g / L (equivalent to 30mmol / L). After adsorption for 180min, the solid is separated by centrifugation, and then placed in a tube furnace for vacuum heat treatment at 650°C for 1.5h. Cool to room temperature to prepare modified biochar. Take modified biochar 100g, mix with 33g pyrite powder (the mass ratio of modified biochar and pyrite is 3:1), grind to particle diameter less than 0.15mm, obtain composite Fenton catalyst (catalyst 1 #).

Embodiment 2-1

[0032] Embodiment 2-1: organic pollutant treatment method

[0033] Taking phenol as a model organic pollutant, the specific effects of the composite Fenton-like catalyst and pollution treatment methods were investigated. In the phenol solution that 1L concentration is 300mg / L, add 30g catalyst 1# prepared in the embodiment 1-1, after stirring and mixing uniformly, add 9mL concentration and be the sodium persulfate solution (equivalent to 9mmol / L) of 1mol / L, stir continuous response. When the reaction was 20, 40, 80, and 120 minutes respectively, samples were taken to measure the total organic carbon content (TOC) in the simulated wastewater. Calculate the degradation rate of phenol under different reaction times according to the change of TOC, the results are shown in figure 1 .

Embodiment 1-2～1-5

[0041] Examples 1-2 to 1-5: Based on Example 1-1, when preparing a composite Fenton-like catalyst, 100 g of modified biochar was mixed with 100, 50, 25, and 20 g of pyrite powder, and ground to The diameter is less than 0.15mm, and composite Fenton-like catalysts 2#, 3#, 4#, 5# are obtained, and the mass ratios of modified biochar and pyrite in each catalyst are 1:1, 2:1, 4:1 respectively and 5:1. According to the method described in Example 2-1, each catalyst (2#: 15g; 3#: 22.5g; 4#: 37.5g; 5#: 45g) containing the same quality pyrite (7.5g) was put into respectively In the phenol solution, the degradation rate of phenol under different reaction times was obtained, the results are shown in figure 2 .

[0042] figure 2 The results show that: when the mass ratio of modified biochar to pyrite in the catalyst is 1-5:1, the degradation rate of organic pollutants by using the technical solution of the present invention is much higher than that of using pyrite alone as a catalys...

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Abstract

The invention discloses a modified biochar based composite Fenton catalyst and a pollution treatment method. The composite Fenton catalyst is characterized in the following steps: placed the biochar in a copper sulfate solution having a concentration of 10-50 mmol / L, stirring or oscillating the biochar and the copper sulfate solution for absorption for 180 min, carrying out centrifugation, and placing the mixture into a tubular furnace or muffle furnace, and carrying out heat treatment at 550-850 DEG C under nitrogen protection for 0.5-2 h to obtain the modified biochar; mixing the modified biochar and pyrite at a mass ratio of 1-5:1, and grinding the modified biochar and pyrite until the particle size is less than 0.15 mm to obtain the composite Fenton catalyst; and adding the composite Fenton catalyst of 10-60 g / L into wastewater containing organic pollutants in order, evenly stirring and mixing, adding persulfate of 3-15 mmol / L, and performing a Fenton oxidation reaction for 20-120min. The modified biochar based composite Fenton catalyst and the pollution treatment method can effectively improve the degradation efficiency of the organic pollutants.

Description

Technical field: [0001] The invention relates to a method for treating organic pollution, in particular to a method for constructing a composite Fenton-like catalyst based on modified biochar and pyrite and degrading organic pollutants in water. Background technique: [0002] At present, the water pollution problem caused by the massive discharge of organic pollutants such as dyes, pesticides, and antibiotics has had a serious impact on the ecological environment and human health. Advanced oxidation technology is an important method for treating organic pollutants. Among them, ferrous ions (Fe 2+ ) and hydrogen peroxide to form a Fenton reaction system, which can generate hydroxyl radicals with strong oxidizing ability, and is suitable for oxidation treatment of most organic pollutants in water. In addition, persulfate can also interact with Fe 2+ A Fenton-like reaction occurs to produce strong oxidizing sulfate radicals, which can oxidize and degrade organic pollutants in...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J27/20C02F101/30
CPCC02F1/725B01J27/20C02F2101/30C02F2305/026
Inventor 李建法朱晓晓冯冬青李益民吕金红
Owner SHAOXING UNIVERSITY
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