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Preparation method of cellulose-based spherical nanoparticle microcluster heavy metal adsorbent

A nanoparticle and cellulose-based technology, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of general adsorption effect, achieve excellent adsorption performance, improve adsorption performance, and large specific surface area and the effect of functional group density

Active Publication Date: 2022-05-13
SICHUAN AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing natural form of cellulose is fibrous, and most of the cellulose-based adsorbents are fibrous or rod-shaped, and the adsorption effect is average.

Method used

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  • Preparation method of cellulose-based spherical nanoparticle microcluster heavy metal adsorbent
  • Preparation method of cellulose-based spherical nanoparticle microcluster heavy metal adsorbent
  • Preparation method of cellulose-based spherical nanoparticle microcluster heavy metal adsorbent

Examples

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Effect test

Embodiment 1

[0032] The preparation method of the cellulose-based spherical nanoparticle microcluster heavy metal adsorbent in this embodiment comprises the following steps:

[0033] Step 1. Pre-cool the mixed solution formed by mixing NaOH, urea, thiourea and deionized water to -7°C, then disperse the agricultural and forestry waste cellulose into the mixed solution and stir vigorously at 1750rpm for 45min, then Centrifuge at a rate of 11000rpm for 20min to remove the insoluble part to obtain a transparent cellulose solution;

[0034] The content of NaOH in the mixed solution is 8wt%, that of urea is 8wt%, and that of thiourea is 6.5wt%.

[0035] The mass ratio of the agricultural and forestry waste cellulose to the mixed solution is 1.5:100;

[0036] The agricultural and forestry waste cellulose is bamboo cellulose (bleached bamboo powder).

[0037] Step 2. Drop deionized water into the transparent cellulose solution obtained in Step 1 at a rate of 50 mL / min, while stirring at a rate o...

Embodiment 2

[0060] The preparation method of the cellulose-based spherical nanoparticle microcluster heavy metal adsorbent in this embodiment comprises the following steps:

[0061] Step 1. Pre-cool the mixed solution formed by mixing NaOH, urea, thiourea and deionized water to -10°C, then disperse the agricultural and forestry waste cellulose into the mixed solution and stir vigorously at 2000rpm for 30min, then Centrifuge at a rate of 11000rpm for 20min to remove the insoluble part to obtain a transparent cellulose solution;

[0062] The content of NaOH in the mixed solution is 7.5wt%, the content of urea is 7wt%, and the content of thiourea is 5.5wt%;

[0063] The mass ratio of the agricultural and forestry waste cellulose to the mixed solution is 1.5:100;

[0064] The agricultural and forestry waste cellulose is cotton cellulose.

[0065] Step 2. Drop deionized water into the transparent cellulose solution obtained in Step 1 at a rate of 60mL / min, while stirring at a rate of 50rpm, ...

Embodiment 3

[0069]The preparation method of the cellulose-based spherical nanoparticle microcluster heavy metal adsorbent in this embodiment comprises the following steps:

[0070] Step 1. Pre-cool the mixed solution formed by mixing NaOH, urea, thiourea and deionized water to -3°C, then disperse the agricultural and forestry waste cellulose into the mixed solution and stir vigorously at a speed of 1500 for 60 minutes, and then Centrifuge at a rate of 11000rpm for 20min to remove the insoluble part to obtain a transparent cellulose solution;

[0071] The content of NaOH in the mixed solution is 9wt%, the content of urea is 9wt%, and the content of thiourea is 7.5wt%;

[0072] The mass ratio of the agricultural and forestry waste cellulose to the mixed solution is 1.5:100;

[0073] The agricultural and forestry waste cellulose is straw cellulose.

[0074] Step 2. Drop deionized water into the transparent cellulose solution obtained in Step 1 at a rate of 70mL / min, while stirring at a rat...

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Abstract

The invention discloses a preparation method of a cellulose-based spherical nanoparticle microcluster heavy metal adsorbent, and the method is as follows: a mixed solution formed by NaOH, urea, thiourea and deionized water is pre-cooled to-3 DEG C to-10 DEG C to dissolve agricultural and forestry waste cellulose, the content of NaOH in the mixed solution is 7.5 wt%-9 wt%, the content of urea in the mixed solution is 7 wt%-9 wt%, and the content of thiourea in the mixed solution is 5.5 wt%-7.5 wt%. The method comprises the following steps: dissolving cellulose in water, treating the dissolved cellulose to generate nano spherical regenerated cellulose, oxidizing with sodium periodate, reacting with glutaraldehyde and an amino-terminated hyperbranched polymer for grafting, and generating the cellulose-based heavy metal adsorbent with a spherical nano-particle micro-cluster structure by virtue of hydrogen-bond interaction among a large number of amino groups. According to the prepared heavy metal adsorbent composed of the microclusters formed by stacking the spherical nanoparticles, a large number of amino groups on the surfaces of the spherical nanoparticles in the microclusters and a large number of pores existing among the spherical nanoparticles jointly improve the adsorption capacity of the adsorbent to heavy metals.

Description

technical field [0001] The invention belongs to the technical field of heavy metal adsorbents, and in particular relates to a preparation method of a cellulose-based spherical nanoparticle microcluster heavy metal adsorbent. Background technique [0002] Heavy metal pollution in water seriously threatens human health and the ecological environment. Cr(VI) is a common heavy metal pollutant in water, which has high biological activity, corrosion and toxicity, and can cause damage to the human respiratory system, DNA, gastrointestinal tract, protein and enzyme systems. The main sources of Cr(VI) pollution are industrial wastewater such as electroplating, textile printing and dyeing, leather tanning, metal polishing, chromium salt industry and COD analysis. In recent years, the removal technology of chromium in aqueous environment has been developed. Among them, adsorption is an important method to remove chromium in water, which has the advantages of low initial cost, recycla...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28C02F1/28B01J20/30C02F101/20
CPCB01J20/24B01J20/28004B01J20/28019C02F1/286C02F2101/20B01J2220/4825
Inventor 张少博朱高璐刘亚西冯宣军卢艳丽汪青军陈琦徐洁吴锋锴李静威胡尔良
Owner SICHUAN AGRI UNIV
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