Modified blue-green algae biochar and preparation method and application thereof

A technology of biochar and cyanobacteria, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of poor adsorption and removal effect of modified biochar, achieve improved adsorption and removal effect, abundant and easy-to-obtain raw materials, evenly dispersed effect

Inactive Publication Date: 2020-02-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing modified cyanobacteria biochar to solve the problems of resource utilization of cyanobacteria and poor adsorption and removal effect of existing modified biochar.

Method used

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  • Modified blue-green algae biochar and preparation method and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of modified cyanobacteria biochar, comprising the following steps:

[0026] 1) Preparation of cyanobacteria biochar: the cyanobacteria are washed, freeze-dried for 24 hours, ground and pulverized, and carbonized in a tubular furnace in a nitrogen atmosphere at a temperature of 600°C; the carbonized cyanobacteria powder is ground, passed through an 80-100 mesh sieve, and then soaked In 0.1mol / LHCl and 0.1mol / L HNO 3 The mixed solution, with a volume ratio of 1:1, was washed with water to neutrality and then dried at 60°C for 48 hours to obtain cyanobacteria biochar;

[0027] 2) Nano-zero-valent iron loading: Dissolve ferrous ammonium sulfate and cyanobacteria biochar in 20% ethanol aqueous solution at a mass ratio of 1:1, place on a magnetic stirrer and stir and mix evenly at a speed of 100rad / min , under the protection of nitrogen, add 1 mol / L potassium borohydride drop by drop, continue to stir for 5-15 minutes after the dropwise addition, the obt...

Embodiment 2

[0032] A preparation method of modified cyanobacteria biochar, comprising the following steps:

[0033] 1) Preparation of cyanobacteria biochar: the cyanobacteria are washed, freeze-dried for 24 hours, ground and pulverized, and carbonized in a tubular furnace in a nitrogen atmosphere at a temperature of 600°C; the carbonized cyanobacteria powder is ground, passed through an 80-100 mesh sieve, and then soaked In 0.1mol / LHCl and 0.1mol / L HNO 3 The mixed solution, with a volume ratio of 1:1, was washed with water to neutrality and then dried at 60°C for 48 hours to obtain cyanobacteria biochar;

[0034] 2) Nano-zero-valent iron loading: Dissolve ammonium ferrous sulfate and cyanobacteria biochar in 20% ethanol aqueous solution at a mass ratio of 1:2, place on a magnetic stirrer and stir and mix evenly at a speed of 100rad / min , under the protection of nitrogen, add 1 mol / L potassium borohydride drop by drop, continue to stir for 5-15 minutes after the dropwise addition, the obt...

Embodiment 3

[0038] A preparation method of modified cyanobacteria biochar, comprising the following steps:

[0039] 1) Preparation of cyanobacteria biochar: the cyanobacteria are washed, freeze-dried for 24 hours, ground and pulverized, and then carbonized in a tubular furnace in a nitrogen atmosphere at a temperature of 600°C; 0.1mol / L HCl and 0.1mol / L HNO 3 The mixed solution, with a volume ratio of 1:1, was washed with water to neutrality and then dried at 60°C for 48 hours to obtain cyanobacteria biochar;

[0040] 2) Nano-zero-valent iron loading: Dissolve ammonium ferrous sulfate and cyanobacteria biochar in 20% ethanol aqueous solution at a mass ratio of 2:1, place on a magnetic stirrer and stir and mix evenly at a speed of 100rad / min , under the protection of nitrogen, add 1 mol / L potassium borohydride drop by drop, continue to stir for 5-15 minutes after the dropwise addition, the obtained mixed solution is centrifuged to remove the supernatant, and the obtained solid is washed a...

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Abstract

The invention discloses a preparation method of modified blue-green algae biochar, wherein the preparation method comprises the steps: S1, washing blue-green alga cleanly, carrying out freeze drying,grinding, pulverizing the blue-green algae, and carrying out carbonization treatment in an inert atmosphere; grinding and sieving the blue-green algae powder, soaking the blue-green algae powder in anacid solution, washing with water to be neutral, and drying to obtain blue-green algae biochar; and S2, dissolving an iron-containing compound and the blue-green algae biochar in an ethanol aqueous solution, placing the solution on a stirrer, uniformly stirring and mixing, dropwise adding a reducing agent in an inert atmosphere, continuously stirring after dropwise adding is finished, carrying out centrifugal separation on the obtained mixed solution to remove supernate, and washing and drying the obtained solid to obtain the modified blue-green algae biochar. On one hand, the blue-green algae waste is used as the raw material, the raw material is rich and easy to obtain, and a new thought is provided for resource utilization of the blue-green algae waste; on the other hand, the preparedblue-green algae biochar loaded nano-iron is uniformly dispersed, the problems that blue-green algae is difficult to treat and utilize, nano-particles are prone to agglomeration and passivation and the like are effectively solved, and the arsenic adsorption and removal effect of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a modified cyanobacteria biochar and its preparation method and application. Background technique [0002] Since the 1990s, the eutrophication of freshwater in my country has become increasingly serious. Severe cyanobacteria blooms have broken out in various places, and the daily salvage amount has even reached thousands of tons. This has destroyed the function of water bodies and caused serious damage to the environment. Moreover, blue-green algae cannot be directly eaten by animals. A large number of salvaged blue-green algae accumulate for a long time because they cannot be processed in time, so that they rot and smell, releasing a large amount of nitrogen, phosphorus, hydrogen sulfide, and microcystins, causing secondary pollution to the environment . [0003] Biochar is a high-carbon solid carbide produced by pyrolysis of biomass under anoxic or low-oxygen conditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/0229B01J20/20B01J2220/4843C02F1/281C02F1/283C02F2101/20
Inventor 赵迎新萨曼刘朵杨颖
Owner TIANJIN UNIV
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