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Heavy metal ion adsorbent and preparation method and application thereof

A technology of heavy metal ions and adsorbents, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as difficult treatment, secondary damage to water environment, etc., and achieve good repeatability and stability , the effect of good application prospects

Inactive Publication Date: 2020-06-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the single use of organic materials as heavy metal ion adsorption materials will lead to difficulties in subsequent treatment, resulting in secondary damage to the water environment.

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
  • Heavy metal ion adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a heavy metal ion adsorbent (APTES@diatomite), and the preparation method of the heavy metal ion adsorbent is as follows:

[0047] (1) Add 1 g of diatomite to 100 mL of 0.5mol / L NaOH solution, stir at room temperature for 1 hour, wash and dry to obtain surface-activated diatomite;

[0048] (2) Add the surface-activated diatomite into 50ml ethanol solution, stir at room temperature for 3 minutes, and ultrasonically clean for 3 minutes to obtain a suspension of diatomite;

[0049] (3) Add 0.86mL of 3-aminopropyltriethoxysilane dropwise into the diatomaceous earth suspension, and use acetic acid (CH 3 COOH) to adjust the pH of the system to 6, stir and react in a water bath at 40°C for 24 hours, then filter with suction, wash with ethanol and deionized water three times, and dry.

[0050] The performance detection result of described heavy metal ion adsorbent is as follows:

[0051](1) FT-IR image of diatomite and heavy metal ion adsorbent figur...

Embodiment 2

[0056] This embodiment provides a heavy metal ion adsorbent (APTES@diatomite), and the preparation method of the heavy metal ion adsorbent is as follows:

[0057] (1) Add 1 g of diatomite to 100 mL of 0.5mol / L NaOH solution, stir at room temperature for 1 hour, wash and dry to obtain surface-activated diatomite;

[0058] (2) Add the surface-activated diatomite into 50ml ethanol solution, stir at room temperature for 3 minutes, and ultrasonically clean for 3 minutes to obtain a suspension of diatomite;

[0059] (3) Add 1.72 mL of 3-aminopropyltriethoxysilane dropwise into the diatomaceous earth suspension, and use acetic acid (CH 3 COOH) to adjust the pH of the system to 6, reflux and stir at 80°C for 12 hours, filter with suction, wash with ethanol and deionized water three times, and dry.

[0060] Depend on Figure 4 It can be seen that the adsorption capacity of the heavy metal ion adsorbent for Pb(II) is 72.54 mg / g, which is greatly improved compared with diatomite.

Embodiment 3

[0062] This embodiment provides a heavy metal ion adsorbent (APTES@diatomite), and the preparation method of the heavy metal ion adsorbent is as follows:

[0063] (1) Add 1 g of diatomite to 100 mL of 0.5mol / L NaOH solution, stir at room temperature for 1 hour, wash and dry to obtain surface-activated diatomite;

[0064] (2) Add the surface-activated diatomite to 50 mL of toluene solution, stir at room temperature for 3 minutes, and ultrasonically clean for 3 minutes to obtain a suspension of diatomite;

[0065] (3) Add 0.86mL of 3-aminopropyltriethoxysilane dropwise to the diatomaceous earth suspension, use hydrochloric acid (HCl) to adjust the pH of the system to 6, reflux and stir at 80°C for 12 hours, then suction filter, Wash three times with ethanol and deionized water respectively, and dry.

[0066] Depend on Figure 4 It can be seen that the adsorption capacity of the heavy metal ion adsorbent for Pb(II) is 57.6 mg / g, which is greatly improved compared with diatomite...

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Abstract

The invention relates to an adsorbent, in particular to a heavy metal ion adsorbent as well as a preparation method and an application thereof. The preparation method of the heavy metal ion adsorbentcomprises the following steps: by taking diatomite and a silane coupling agent as raw materials, carrying out a dehydration condensation reaction; wherein the silane coupling agent is 3-aminopropyltriethoxysilane or 3-mercaptopropyltrimethoxysilane. The method is good in repeatability, good in stability, simple to operate and low in cost; the heavy metal ion adsorbent prepared by the method has rich surface functional groups and a micron-scale porous matrix, and the surface of the heavy metal ion adsorbent further has rich functional groups on the basis of retaining a complete nano structure of a diatomite; and the adsorbent has a good application prospect in the field of water treatment.

Description

technical field [0001] The invention relates to an adsorbent, in particular to a heavy metal ion adsorbent and a preparation method and application thereof. Background technique [0002] The discharge of waste water containing heavy metal ions seriously pollutes the environment and endangers human health; the water pollution problem has attracted the attention of researchers in the field of water treatment; the development of low-cost, large-scale production and use of heavy metal ion adsorption materials is an urgent task for people in the field Technical problems to be solved. [0003] The surface of the natural porous mineral diatomite is rich in silanol and has a uniform pore structure, which is an excellent heavy metal ion adsorption material; however, its specific surface area is limited, and the active sites that can participate in the reaction are limited, making the adsorption performance unsatisfactory. [0004] The surface of organic materials is rich in function...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/22B01J20/14B01J20/28054C02F1/288C02F1/285C02F1/281C02F2101/20
Inventor 杜玉成靳翠鑫李杨牛炎王学凯谷恒学李生辉
Owner BEIJING UNIV OF TECH
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