Preparation method for coal/polyethyleneimine crosslinked composite chelate adsorbent

Abstract

The invention relates to a preparation method for a coal / polyethyleneimine crosslinked composite chelate adsorbent. The preparation method consists of three steps of ultrafine coal powder preparation, grafting reaction and crosslinking reaction and specifically comprises the steps of coupling and polymerizing coal powder through 3-aminopropyltriethoxysilane serving as a coupling agent, performing high-energy ball grinding to prepare the ultrafine coal powder, grafting polyethyleneimine (PEI) to the surface of the coal powder through chemical grafting, and performing crosslinking molding through epoxy chloropropane serving as a crosslinking agent to prepare the coal / polyethyleneimine crosslinked composite chelate adsorbent. The ultrafine coal powder is used as a base body, so that a new coal utilization way is expanded, and the cost is low; the adsorption characteristic is very excellent, and the cost-to-performance ratio is extremely high; the PEI is grafted to the surface of the coal powder and is subjected to crosslinking molding, so that the shortcoming of low intensity of the coal powder is overcome, and the chelate characteristic of the PEI is realized, so that the mechanical intensity of a finished product is improved, and heavy metal ions can be adsorbed and chelated; a treatment effect on heavy metals is enhanced.

Description

technical field

[0001] The invention belongs to the technical field of research on chelating adsorbents used in the wastewater pollution treatment process, and in particular relates to a preparation method of a coal / polyethyleneimine cross-linked composite chelating adsorbent. Background technique

[0002] Heavy metal pollution has considerable harm to the environment and human body, and its sources are mainly electroplating, non-ferrous metal mining and smelting, chemical and chemical industries. At present, the main treatment methods for heavy metal pollution include chelation precipitation method, ion exchange method, adsorption method, membrane separation method, etc., and chelation precipitation method is the most effective and commonly used method for treating heavy metal wastewater. The chelating agent reacts with the heavy metal ions in the water to form a flocculent heavy metal complex that is insoluble in water and precipitates to effectively remove the heavy metal...

Examples

Embodiment 1

[0025] With 120g lignite coal powder as raw material, the method for preparing coal / polyethyleneimine cross-linked composite chelating adsorbent is realized by the following steps:

[0026] (1) Preparation of ultrafine coal powder

[0027] Take lignite and crush it into pulverized coal with a particle size of about 0.1-1mm, take 120g, deash with 0.1mol / L hydrochloric acid for 30min, add 3.6g of γ-aminopropyltriethoxysilane (KH550) as a coupling agent, coal The mass ratio of powder to γ-aminopropyltriethoxysilane is 1:0.03, stir and mix thoroughly, put into a ball mill and mill for 5 hours to obtain coal powder with a particle size of 0.1-5 μm.

[0028] (2) Grafting reaction

[0029] Take 5g of coal powder with a particle size of 0.1-5μm after ball milling, add 10ml of polyethyleneimine aqueous solution with a mass concentration of 1.5%, and the mass ratio of coal powder with a particle size of 0.1-5μm to polyethyleneimine is 1:0.03 , stirred and reacted for 3 hours in a wate...

Embodiment 2

[0033] With 120g lignite coal powder as raw material, the method for preparing coal / polyethyleneimine cross-linked composite chelating adsorbent is realized by the following steps:

[0034] (1) Preparation of ultrafine coal powder

[0035] Take lignite and crush it into coal powder with a particle size of 0.1-1mm, take 120g, deash with 0.1mol / L hydrochloric acid for 30min, add 1.2g of γ-aminopropyltriethoxysilane (KH550) as coupling agent, coal powder The mass ratio of γ-aminopropyltriethoxysilane to γ-aminopropyltriethoxysilane is 1:0.01, fully stirred and mixed, put into a ball mill and milled for 5 hours to obtain coal powder with a particle size of 0.1-5 μm.

[0036] (2) Grafting reaction

[0037] Take 5g of coal powder with a particle size of 0.1-5μm after ball milling, add 6.67ml of polyethyleneimine aqueous solution with a mass concentration of 1.5%, and the mass ratio of coal powder with a particle size of 0.1-5μm to polyethyleneimine is 1: 0.02, stirred and reacted ...

Embodiment 3

[0041] With 120g lignite coal powder as raw material, the method for preparing coal / polyethyleneimine cross-linked composite chelating adsorbent is realized by the following steps:

[0042] (1) Preparation of ultrafine coal powder

[0043] Take lignite and crush it into pulverized coal with a particle size of 0.1-1mm, take 120g, deash with 0.1mol / L hydrochloric acid for 30min, add 6.0g of γ-aminopropyltriethoxysilane (KH550) as coupling agent, coal powder The mass ratio of γ-aminopropyltriethoxysilane to γ-aminopropyltriethoxysilane is 1:0.05, fully stirred and mixed, put into a ball mill and milled for 5 hours to obtain coal powder with a particle size of 0.1-5 μm.

[0044] (2) Grafting reaction

[0045] Take 5g of coal powder with a particle size of 0.1-5μm after ball milling, add 16.67ml of polyethyleneimine aqueous solution with a mass concentration of 1.5%, and the mass ratio of coal powder with a particle size of 0.1-5μm to polyethyleneimine is 1: 0.05, stirred and rea...

technical field

[0001] The invention belongs to the technical field of research on chelating adsorbents used in the wastewater pollution treatment process, and in particular relates to a preparation method of a coal / polyethyleneimine cross-linked composite chelating adsorbent. Background technique

[0002] Heavy metal pollution has considerable harm to the environment and human body, and its sources are mainly electroplating, non-ferrous metal mining and smelting, chemical and chemical industries. At present, the main treatment methods for heavy metal pollution include chelation precipitation method, ion exchange method, adsorption method, membrane separation method, etc., and chelation precipitation method is the most effective and commonly used method for treating heavy metal wastewater. The chelating agent reacts with the heavy metal ions in the water to form a flocculent heavy metal complex that is insoluble in water and precipitates to effectively remove the heavy metal...

Examples

Embodiment 1

[0025] With 120g lignite coal powder as raw material, the method for preparing coal / polyethyleneimine cross-linked composite chelating adsorbent is realized by the following steps:

[0026] (1) Preparation of ultrafine coal powder

[0027] Take lignite and crush it into pulverized coal with a particle size of about 0.1-1mm, take 120g, deash with 0.1mol / L hydrochloric acid for 30min, add 3.6g of γ-aminopropyltriethoxysilane (KH550) as a coupling agent, coal The mass ratio of powder to γ-aminopropyltriethoxysilane is 1:0.03, stir and mix thoroughly, put into a ball mill and mill for 5 hours to obtain coal powder with a particle size of 0.1-5 μm.

[0028] (2) Grafting reaction

[0029] Take 5g of coal powder with a particle size of 0.1-5μm after ball milling, add 10ml of polyethyleneimine aqueous solution with a mass concentration of 1.5%, and the mass ratio of coal powder with a particle size of 0.1-5μm to polyethyleneimine is 1:0.03 , stirred and reacted for 3 hours in a wate...

Embodiment 2

[0033] With 120g lignite coal powder as raw material, the method for preparing coal / polyethyleneimine cross-linked composite chelating adsorbent is realized by the following steps:

[0034] (1) Preparation of ultrafine coal powder

[0035] Take lignite and crush it into coal powder with a particle size of 0.1-1mm, take 120g, deash with 0.1mol / L hydrochloric acid for 30min, add 1.2g of γ-aminopropyltriethoxysilane (KH550) as coupling agent, coal powder The mass ratio of γ-aminopropyltriethoxysilane to γ-aminopropyltriethoxysilane is 1:0.01, fully stirred and mixed, put into a ball mill and milled for 5 hours to obtain coal powder with a particle size of 0.1-5 μm.

[0036] (2) Grafting reaction

[0037] Take 5g of coal powder with a particle size of 0.1-5μm after ball milling, add 6.67ml of polyethyleneimine aqueous solution with a mass concentration of 1.5%, and the mass ratio of coal powder with a particle size of 0.1-5μm to polyethyleneimine is 1: 0.02, stirred and reacted ...

Embodiment 3

[0041] With 120g lignite coal powder as raw material, the method for preparing coal / polyethyleneimine cross-linked composite chelating adsorbent is realized by the following steps:

[0042] (1) Preparation of ultrafine coal powder

[0043] Take lignite and crush it into pulverized coal with a particle size of 0.1-1mm, take 120g, deash with 0.1mol / L hydrochloric acid for 30min, add 6.0g of γ-aminopropyltriethoxysilane (KH550) as coupling agent, coal powder The mass ratio of γ-aminopropyltriethoxysilane to γ-aminopropyltriethoxysilane is 1:0.05, fully stirred and mixed, put into a ball mill and milled for 5 hours to obtain coal powder with a particle size of 0.1-5 μm.

[0044] (2) Grafting reaction

[0045] Take 5g of coal powder with a particle size of 0.1-5μm after ball milling, add 16.67ml of polyethyleneimine aqueous solution with a mass concentration of 1.5%, and the mass ratio of coal powder with a particle size of 0.1-5μm to polyethyleneimine is 1: 0.05, stirred and rea...

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