Charcoal amine sulfur dual-group modification method

A biochar and group technology, applied in chemical instruments and methods, water/sludge/sewage treatment, adsorption water/sewage treatment, etc., can solve problems such as small pore volume, high ash content of biochar, and small specific surface area. Achieve strong passivation ability and improve physical and chemical properties

Inactive Publication Date: 2017-07-07
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, biochar has the disadvantages of high ash content, small pore volume, wide micropore distribution, small specific surface area, poor adsorption selectivity, etc., and is limited by sur

Method used

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  • Charcoal amine sulfur dual-group modification method
  • Charcoal amine sulfur dual-group modification method
  • Charcoal amine sulfur dual-group modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of amine sulfur modification method of biochar, the step of specific modification is as follows:

[0022] (1) Acidify and oxidize biochar with nitric acid, and ultrasonically shake for 2 hours; centrifuge and wash to neutral to obtain acidified activated biochar BC-O; the concentration of nitric acid is controlled at 9mol / L;

[0023] (2) Adjust the pH of activated biochar BC-O to 11, add formaldehyde at a constant temperature of 60°C, react for 40 minutes, add diethylenetriamine dropwise and react for 6 hours, and obtain amino-modified biochar BC-N; The molar ratio of carbon BC-O: formaldehyde: diethylenetriamine is 1:0.9:1.1;

[0024] After cooling to room temperature, add NaOH with a mass fraction of 45%, and then dropwise add carbon disulfide to carry out sulfur group reaction. After the dropwise addition, raise the temperature to 60°C and react for 7 hours; centrifuge, wash, and dry to obtain amine-sulfur double-group modified biochar BC-SN, wherein the mola...

Embodiment 2

[0026] A kind of amine sulfur modification method of biochar, the step of specific modification is as follows:

[0027] (1) The biochar was acidified and oxidized with nitric acid, and ultrasonically oscillated for 3 hours; centrifuged and washed to neutral to obtain acidified activated biochar BC-O; the concentration of nitric acid was controlled at 8mol / L;

[0028] (2) Adjust the pH of BC-O to 10.5, add formaldehyde at a constant temperature of 40°C, react for 30 minutes, add triethylenetetramine dropwise and react for 4 hours to obtain amino-modified biochar BC-N; among them, activated biochar BC- The molar ratio of O: formaldehyde: triethylenetetramine is 1:0.8:1.2.

[0029] After cooling to room temperature, add NaOH with a mass fraction of 50%, and then dropwise add carbon disulfide to carry out sulfur group reaction. After the dropwise addition, raise the temperature to 80°C, and react for 5 hours; centrifuge, wash, and dry to obtain amine-sulfur double-group modified b...

Embodiment 3

[0032] A kind of amine sulfur modification method of biochar, the step of concrete modification is as follows:

[0033] (1) The biochar was acidified and oxidized with nitric acid, and ultrasonically oscillated for 5 hours; centrifuged and washed to neutral to obtain acidified activated biochar BC-O; the concentration of nitric acid was controlled at 10mol / L;

[0034] (2) Adjust the pH of activated biochar BC-O to 12, add formaldehyde at a constant temperature of 50°C, react for 20 minutes, add triethylenetetramine dropwise and react for 5 hours to obtain amino-modified biochar BC-N; The molar ratio of carbon BC-O: formaldehyde: triethylenetetramine is 1:0.8:1.1.

[0035] After cooling to room temperature, add NaOH with a mass fraction of 40%, and then dropwise add carbon disulfide to carry out sulfur group reaction. After the dropwise addition, raise the temperature to 70°C and react for 5 hours; centrifuge, wash, and dry to obtain amine-sulfur double-group modified biochar ...

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Abstract

The invention discloses a charcoal amine sulfur dual-group modification method. The method comprises the following steps that charcoal is subjected to nitric acid acidification oxidation, after ultrasonic concussion is performed for 2-5 h, centrifugal washing is performed till the charcoal is neutral to obtain oxidized activated charcoal BC-O; on the basis of the oxidized activated charcoal BC-O, the proper PH is adjusted, methanal is added under the constant temperature of 40-60 DEG C, ta reaction is performed to 20-50 min, polyamine substances are added dropwise, a reaction is performed for 4-6 h, and amino modified charcoal BC-N is obtained; cooling is performed to reach the room temperature, NaOH with the mass fraction being 40-50% is added, carbon disulfide is added dropwise to perform a sulfenyl reaction, after dropping is completed, the temperature is increased to 60-80 DEG C, and a reaction is performed for 5-7 h; centrifugal washing is performed, and after drying, the amine sulfur dual-group modified charcoal BC-SN is obtained. The prepared modified charcoal has the advantages that surface groups are abundant, the specific surface area is large, and the pore volume is large, and heavy metal ions are adsorbed and passivated.

Description

technical field [0001] The invention relates to a method for modifying biochar, belonging to the field of environmental application materials. Background technique [0002] Biochar is an intolerant, stable, highly aromatized, carbon-rich solid substance produced by slow high-temperature heating and pyrolysis of animal and plant residues in an anoxic or anaerobic environment. Since Lehmann published "A handful of carbon" in the "Nature" magazine in 2007, researchers have gradually paid attention to biochar. [0003] Biomass such as crop stalks, waste wood chips, poultry manure, silt, etc., made of biochar under anoxic conditions firstly avoids a large amount of carbon emissions, and provides a new model of turning waste into wealth in the environmental field, increasing sinks and reducing emissions; at the same time Biochar is rich in nutrient elements. Applying it to soil improvement can not only improve the physical and chemical properties and microbial characteristics of ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28B09C1/00
CPCB01J20/20B09C1/00C02F1/283
Inventor 祝建中何敏霞吴绍凯张迪徐菲菲张欢季晖
Owner HOHAI UNIV
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