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Fibrous sorbent

An adsorbent and fibrous technology, which is applied in the field of fibrous adsorbents, can solve the problems of reduced adsorption, reduced cleaning efficiency, and reduced chelation capacity of adsorbents.

Active Publication Date: 2020-06-05
ZAKRYTOE AKTSIONERNOE OBSHCHESTVO AKVAFOR PRODAKSHN ZAO AKVAFOR PRODAKSHN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, the increased swelling and the resulting loose adsorbent structure increase the risk of ions slipping through the adsorbent layer into pure water and the risk of channeling, which not only reduces cleaning efficiency, but also increases the risk of heavy metal infiltration. Possibility of controlled entry into pure water and human body
Due to the disadvantages of this adsorption: fragility and instability of these bonds with ions, can be initiated by supersaturation of the adsorbent with ions, use of the adsorbent under dynamic adsorption conditions, swelling, loosening and wear of the adsorbent bond break
Second, the low chelating capacity of the adsorbent significantly reduces the ability to adsorb most transition metal ions and complex metals, such as copper, lead, aluminum, thallium ions
In addition, the adsorbent according to patent RU 2194809 adsorbs chromium Cr(VI) well only in the low pH range, while in the neutral region the adsorption is significantly reduced
This makes the sorbent suitable for the extraction of chromium, Cr(VI) from electroplating solutions, but makes it unsuitable for the purification of drinking water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105]The substrate was PAN fibers from a copolymer of acrylonitrile (87.1%) and vinyl acetate (12.9%), with a thickness of 13 μm, modified with DETA in the presence of sodium hydroxide NaOH in a glycerol vehicle.

[0106] The characteristics of the adsorbent:

[0107] The carboxy-N,N'-polyacrylamide-N,N'-bis(iminoethane) content was 70% by weight of the filament.

[0108] The content of the adsorption chelation center is 3.5mmol / g;

[0109] СОЕ HCl -7.6mmol / g;

[0110] СОЕ NaOH -2.2mmol / g;

[0111] CE of Cu(II) - 3.8mmol / g;

[0112] CE of Pb(II) - 1.65mmol / g;

[0113] Cr(VI) CE-4.8mmol / g (pH 6.5-7.0); 9.2mmol / g (pH 3.5-4.5);

[0114] During the adsorption of copper ions Cu(II) and lead Pb(II) in the context of a 100-fold excess of calcium, the separation factor is: K Cu / Ca=10 4 , K Pb / Ca=10 3 .

Embodiment 2

[0116] The substrate was PAN fibers from a copolymer of acrylonitrile (85%) and vinyl acetate (15%), with a thickness of 15 μm, modified with TETA in propylene glycol and DMSO in the presence of sodium carbonate.

[0117] The characteristics of the adsorbent:

[0118] The carboxy-N,N'-polyacrylamide-N,N'-bis(iminoethane) content was 80% by weight of the filament.

[0119] The content of the adsorption chelation center is 4.3mmol / g;

[0120] СОЕ HCl -9.2mmol / g;

[0121] СОЕ NaOH -2.5mmol / g;

[0122] CE of Cu(II) - 4.6mmol / g;

[0123] CE of Pb(II) - 1.70mmol / g;

[0124] Cr(VI) CE-5.2mmol / g (pH 6.5-7.0); 10.8mmol / g (pH 3.5-4.5);

[0125] During the adsorption of copper ions Cu(II) and lead Pb(II) in the context of a 100-fold excess of calcium, the separation factor is: K Cu / Ca=10 5 , K Pb / Ca=10 4 .

Embodiment 3

[0127] The substrate was PAN fibers from a copolymer of acrylonitrile (90%) and vinyl acetate (10%), with a thickness of 11 μm, in propylene glycol and DMSO, modified with polyethyleneimine.

[0128] The characteristics of the adsorbent:

[0129] The carboxy-N,N'-polyacrylamide-N,N'-bis(iminoethane) content was 90% by weight of the filament.

[0130] The content of the adsorption chelation center is 5mmol / g;

[0131] СОЕ HCl -11.0mmol / g;

[0132] СОЕ NaOH -3.7mmol / g;

[0133] CE of Cu(II) - 4.8mmol / g;

[0134] CE of Pb(II) - 1.80mmol / g;

[0135] Cr(VI) CE-6.5mmol / g (pH 6.5-7.0); 12.1mmol / g (pH 3.5-4.5);

[0136] CE of As(V)-0.35mmol / g;

[0137] During the adsorption of copper ions Cu(II) and lead Pb(II) in the context of a 100-fold excess of calcium, the separation factor is: K Cu / Ca=10 5 , K Pb / Ca=10 4 .

[0138] Compared to the adsorbents known in the prior art, including the closest analogues of RU 2194809, the claimed adsorbent is characterized by a high content...

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Abstract

A fibrous polyampholyte sorbent based on polyacrylonitrile modified by an aliphatic di-, oligo-, or polyamine. The sorbent is a polymer matrix made of filaments having an outer ion exchange layer madeof three-dimensional carboxy-N,N'polyacrylamide-N,N'di(iminoethane) structures that are cross-linked to one another by intermolecular amide cross-links, the percentage of said structures constitutingno less than 50% and no more than 90% of the total mass of the filament, and said structures comprising repeating three-dimensional chelated sorption centers consisting of two amino groups and one carboxyl group. The sorbent is intended for the sorption of heavy metal ions from water.

Description

technical field [0001] The present invention relates to fibrous adsorbents for the removal of heavy metal ions from water and aqueous solutions. [0002] Currently, fibrous adsorbents based on modified polyacrylonitrile (hereinafter referred to as PAN) and / or its copolymers are used to remove heavy metal ions from water, such as chromium Cr(VI), copper Cu(II), lead Pb( II), iron Fe(II) and Fe(III). Adsorption of metals in these sorbents occurs due to ion exchange reactions and / or complexation of metal ions with functional sorbent groups. Adsorbents known from the prior art are characterized by low adsorption properties, as well as instability and fragility of complex adsorbents with metal ions, which can lead to the destruction of these complexes and the introduction of toxic ions into pure water. Desorption. Additionally, the adsorbent has low kinetic properties. In addition, most adsorbents have a high swelling capacity in water, which complicates their use in water trea...

Claims

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Application Information

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IPC IPC(8): B01J20/285D01F11/06B01D39/16C02F1/28C02F101/20
CPCB01J45/00B01J43/00D01F6/18C02F1/42D01F6/38D01F11/06D01F11/04B01J20/285
Inventor 叶夫根尼娅·谢尔盖耶芙娜·瓦西尔·耶娃尤利亚·阿纳托列芙娜·列米佐娃尤里·叶夫根尼耶维奇·卡扎克维奇亚历山大·根纳德维奇·米蒂利内奥斯
Owner ZAKRYTOE AKTSIONERNOE OBSHCHESTVO AKVAFOR PRODAKSHN ZAO AKVAFOR PRODAKSHN