Preparation method and application of cyanobacteria modified charcoal with high adsorption efficiency

A technology of biochar and high adsorption, applied in chemical instruments and methods, adsorption water/sewage treatment, restoration of contaminated soil, etc., can solve problems such as imperfect soil remediation technology, reduce migration and transformation risks, increase pore size, Effect of large specific surface area and porosity

Inactive Publication Date: 2020-12-11
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned existing technical problems, the present invention provides a preparation method and application of cyanobacteria modified bioch

Method used

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  • Preparation method and application of cyanobacteria modified charcoal with high adsorption efficiency
  • Preparation method and application of cyanobacteria modified charcoal with high adsorption efficiency
  • Preparation method and application of cyanobacteria modified charcoal with high adsorption efficiency

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Embodiment 1: 1-1. Preparation of modified cyanobacterial biochar, the specific steps are as follows:

[0036] 1-1-1. Collect the cyanobacteria salvaged from the salvage station, dry them in a 105°C oven, pulverize them with a pulverizer, and then put them in a quartz boat and put them in a tube furnace, and carry out the process under nitrogen protection. Carbonized treatment. The heating rate was required to be 5 °C / min, the nitrogen flow rate was 50 mL / min, the heating temperature was first raised from room temperature to 300 °C, kept for 1 h, and then cooled to room temperature, and the obtained carbon material was marked as ZC300.

[0037] 1-1-2. First, the carbon material ZC300 is further pulverized by a pulverizer and passed through a 100-mesh sieve. Then the undersize was mixed with KOH in a mass ratio of 1:2, and deionized water was added to make the KOH concentration at 20%. Then, the mixture was dried in an oven at 80° C., and then placed in a tube furnace,...

Example Embodiment

[0046] Example 2:

[0047] 2-1. Preparation of modified cyanobacterial biochar, the specific steps are as follows:

[0048] 2-1-1. Put the collected blue-green algae in a freeze-drying machine to freeze-dry, pass through a 100-mesh sieve after being pulverized by a pulverizer, and put them into a tube furnace for carbonization. The heating rate is 5°C / min, and the nitrogen flow rate is 0.5L / min, the temperature was raised from room temperature to 300 °C, kept for 2 h, and then cooled to room temperature, and the obtained carbon material was marked as ZC300.

[0049] 2-1-2. First, add the carbon material ZC300 into KOH according to the mass ratio of 1:3 and mix evenly, then add deionized water to make the KOH concentration at 30%. The mixture was dried in an oven at 80 °C, then carbonized in a tube furnace, heated to 700 °C, kept for 3 h, and cooled to room temperature. The obtained carbon material was marked as KOH-ZC700.

[0050] 2-1-3. Add 40% HCl to the above-mentioned c...

Example Embodiment

[0055] Example 3:

[0056] 3-1. Preparation of modified cyanobacterial biochar, the specific steps are as follows:

[0057] 3-1-1. Collect the blue-green algae and place them in a 105°C oven to dry, then crush them with a crusher and put them into a tube furnace for carbonization treatment. The heating rate is 5°C / min, and the nitrogen flow rate is 80mL / min. The temperature was increased from room temperature to 300 °C and maintained for 1.5 h, and the obtained carbon material was marked as ZC300.

[0058] 3-1-2. Pulverize the cooled ZC300 and pass it through a 100-mesh sieve, add KOH according to the mass ratio of 1:2.5 and mix evenly, add deionized water to make the KOH concentration 30%, put it in a 90 ℃ oven to dry, and then put Carbonized in a tube furnace, heated to 700 °C, maintained for 2.5 h, cooled to room temperature, and the obtained carbon material was marked as KOH-ZC700.

[0059] 3-1-3. Add 30% HNO3 to the above cooled KOH-ZC700, shake on a shaking table for 2...

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Abstract

The invention discloses a preparation method and application of cyanobacteria modified biochar with high adsorption efficiency, and the preparation method comprises the following specific steps: S1, primary carbonization: drying and crushing cyanobacteria, conducting carbonizing in an inert atmosphere, raising the temperature from room temperature to 300 DEG C, keeping the temperature for 1-2 hours, and conducting cooling to obtain a primary carbon material; S2, secondary carbonization: crushing the primary carbon material, mixing the crushed primary carbon material with KOH according to a mass ratio of 1:(2-3), and adding deionized water to make the concentration of KOH be 20-40%, drying the obtained mixture, conducting carbonizing in an inert atmosphere, raising the temperature from roomtemperature to 700 DEG C, keeping the temperature for 1-3h, and conducting cooling to obtain a coarse carbon material; and S3, post-treatment: adding 20-40% of HNO3 or HCl into the crude carbon material, conducting oscillating in a shaking table for 2-3 hours, removing the supernatant, washing the obtained solid with water until the solid is neutral, and conducting drying to obtain the modified cyanobacteria biochar. The cyanobacteria modified biochar with high adsorption efficiency prepared by the method is applied to water treatment and soil remediation, and has adsorption and immobilization effects on organic pollutants.

Description

technical field [0001] The invention relates to a preparation method and application of cyanobacteria modified biochar with high adsorption efficiency, and belongs to the technical field of water treatment or soil restoration. Background technique [0002] Cyanobacteria are a type of phototrophic bacteria present in many ecosystems and are key players in photosynthesis. But when cyanobacteria grow and expand too quickly, they can destroy freshwater resources and produce toxins. The resource utilization of blue-green algae is the last step in the disposal of blue-green algae, and it is also an effective way to avoid secondary pollution of blue-green algae. According to the data, the salvage of blue-green algae in Taihu Lake reached 2.5 million tons in 2017, the highest in history. Influenced by the governance of globalization and climate conditions, the salvage volume of blue-green algae is 1.86 million tons. At present, domestic cyanobacteria disposal methods include compo...

Claims

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Application Information

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IPC IPC(8): B01J20/20B09C1/00C02F1/28B01J20/30
CPCB01J20/20B09C1/00C02F1/283
Inventor 殷勤年跃刚闫海红郭晓娅梁雨王幸智胡黎明
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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