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Heavy metal ion adsorbent and preparation method and application thereof

A technology for heavy metal ions and adsorbents, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of inability to achieve continuous treatment, severe decline in adsorption performance, complex synthesis process, etc., and achieve the adsorption rate. The effect of fast, simple regeneration process and high adsorption capacity

Inactive Publication Date: 2016-11-09
汪竹青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In recent years, many new adsorbents have been developed, such as chitosan and its derivatives, modified clay, sepiolite, montmorillonite, aluminum-zirconium pillared montmorillonite, etc., but most of these adsorbents have the following properties: Disadvantages: (1) The synthesis process is more complicated, and most of them are synthesized in organic solvents, such as in toluene, methanol, ethanol and other solvents
(2) The stability is not high, and after repeated use, the adsorption performance drops drastically
(3) The adsorption rate is slow and continuous processing cannot be achieved

Method used

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  • Heavy metal ion adsorbent and preparation method and application thereof
  • Heavy metal ion adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of heavy metal ion adsorbent:

[0036] (1) Weigh 0.3g of mesoporous molecular sieve (SBA-15) and disperse it in 50mL of water, add 0.2mL of 3-aminopropyltrimethoxysilane under stirring condition, react at 25℃ for 4h, filter, and wash with acetone successively Wash with distilled water and dry at 40°C to obtain amino-modified SBA-15;

[0037] (2) Weigh 0.5g of sodium alginate and dissolve it in 50mL of water, add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride for activation for 1 hour, and add amino-modified SBA-15 was reacted at 25°C for 4 hours, filtered, washed with acetone and distilled water successively, and dried at 40°C to obtain a heavy metal ion adsorbent. The transmission electron microscope image of the heavy metal ion adsorbent is shown in figure 1 shown.

Embodiment 2

[0039] A kind of preparation method of heavy metal ion adsorbent:

[0040] (1) Weigh 0.3g of mesoporous molecular sieve (MCM-41) and disperse it in 50mL of water, add 0.2mL of 3-aminopropyltrimethoxysilane under stirring condition, react at 25℃ for 4h, filter, and wash with acetone successively Wash with distilled water and dry at 40°C to obtain amino-modified SBA-15;

[0041](2) Weigh 0.5g of sodium alginate and dissolve it in 50mL of water, add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride for activation for 1 hour, and add amino-modified SBA-15 was reacted at 25°C for 4 hours, filtered, washed with acetone and distilled water successively, and dried at 40°C to obtain a heavy metal ion adsorbent.

[0042] The difference between Example 2 and Example 1 is that the mesoporous molecular sieve (SBA-15) is replaced by mesoporous molecular sieve (MCM-41).

Embodiment 3

[0044] A kind of preparation method of heavy metal ion adsorbent:

[0045] (1) Weigh 0.3g of 100-120 mesh silica gel and disperse it in 50mL of water, add 0.2mL of 3-aminopropyltrimethoxysilane under stirring condition, react at 25°C for 4h, filter, wash with acetone and distilled water successively , dried at 40°C to obtain amino-modified SBA-15;

[0046] (2) Weigh 0.5g of sodium alginate and dissolve it in 50mL of water, add 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride for activation for 1 hour, and add amino-modified SBA-15 was reacted at 25°C for 4 hours, filtered, washed with acetone and distilled water successively, and dried at 40°C to obtain a heavy metal ion adsorbent.

[0047] The difference between Example 3 and Example 1 is that the mesoporous molecular sieve (SBA-15) is replaced by 100-120 mesh silica gel.

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Abstract

The invention relates to a heavy metal ion adsorbent. The heavy metal ion adsorbent is characterized in that a silicon dioxide carrier is used as a raw material, and is modified by a grafting reagent and a functional reagent, so as to form the heavy metal ion adsorbent; the grafting reagent is silane of which the end group is provided with amino, and the functional reagent is alginate and alginic acid. A preparation method comprises the following steps of dispersing the silicon dioxide carrier into water, and adding the grafting reagent, so as to obtain a solid and liquid mixture I; separating solid and liquid, washing, and drying, so as to obtain the amino-modified silicon dioxide; dissolving the functional reagent into water, sequentially adding 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, and the amino-modified silicon dioxide, and reacting, so as to obtain a solid and liquid mixture II; separating solid and liquid, washing, and drying, so as to obtain the heavy metal ion adsorbent. The heavy metal ion adsorbent has the characteristics that the adsorbing speed is quick, the adsorbing capacity is high, the regeneration process is simple, and the property is still stable even after recycling for multiple times; the steps of the preparation method are simple, the cost is low, the condition is mild, and the environment-friendly effect is realized.

Description

technical field [0001] The invention relates to the technical field of solid-phase adsorption, and more particularly relates to a heavy metal ion adsorbent and its preparation method and application. Background technique [0002] Heavy metal ions (cadmium, lead, chromium, mercury, zinc, copper, arsenic, etc.) in water are important pollution sources of environmental water quality. Wastewater containing heavy metal ions mainly comes from smelting, electrolysis, medicine, electroplating, textile printing and dyeing, papermaking, ceramics and inorganic pigment manufacturing, etc. Since these heavy metal ions cannot be decomposed, they accumulate and accumulate in organisms, and then pass through the food chain. harm. Therefore, it is of great significance to remove heavy metal ions in water. [0003] At present, the treatment methods of wastewater containing heavy metal ions mainly include chemical precipitation, electrolysis, solvent extraction, ion exchange, membrane separa...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24C02F1/281C02F1/286C02F2101/20
Inventor 汪竹青王敏吴根华
Owner 汪竹青
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