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A kind of nitrogen/sulfur co-doped porous cellulose adsorbent and preparation method and application

A porous cellulose and co-doping technology, applied in the field of water treatment, can solve the problems of hexavalent chromium adsorption capacity, selectivity and affinity to be further improved, and achieve excellent adsorption rate, wide range of sources, and low price

Active Publication Date: 2021-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the currently reported cellulose-based adsorbents show a certain adsorption effect on chromium ions, their adsorption capacity, selectivity and affinity for hexavalent chromium need to be further improved.

Method used

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  • A kind of nitrogen/sulfur co-doped porous cellulose adsorbent and preparation method and application
  • A kind of nitrogen/sulfur co-doped porous cellulose adsorbent and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Preparation of polyvinylimidazole: 10 parts by volume of vinylimidazole, 0.2 parts by mass of azobisisobutyronitrile, and 55 parts by volume of toluene were reacted at 70° C. for 4 hours to obtain white polyvinylimidazole powder.

[0042] (2) After adding 0.125 parts by mass of polyvinylimidazole to 15 parts by volume of 28wt% urea solution for dissolution, add 13 parts by mass of 4wt% cellulose solution (7wt% sodium hydroxide, 12wt% urea), and stir for 5 hours at room temperature well mixed.

[0043] (3) Add 2 parts by volume of epichlorohydrin to the system of step (2), so that the mass-volume ratio of cellulose, polyvinylimidazole, and epichlorohydrin is 4:1:16, and stir at 0°C for 1 hour , the obtained transparent solution was placed in an oven at 60° C. for 1 h, and the obtained solid sample was washed several times with deionized water and tert-butanol, and then freeze-dried.

[0044] (4) Add 0.1 parts by mass of the solid sample obtained in step (3) into 100...

Embodiment 2

[0047] (1) After adding 0.330 parts by mass of polyvinylimidazole to 15 parts by volume of 28wt% urea solution for dissolution, add 13 parts by mass of 4wt% cellulose solution (7wt% sodium hydroxide, 12wt% urea), and stir for 12 hours at room temperature well mixed.

[0048] (2) Add 2 parts by volume of epichlorohydrin to the system of step (1), so that the mass-volume ratio of cellulose, polyvinylimidazole, and epichlorohydrin is 3:4:12, and stir at 5°C for 2 hours , the obtained transparent solution was placed in an oven at 50° C. for 2 h, and the obtained solid sample was washed several times with deionized water and tert-butanol, and then freeze-dried.

[0049] (3) Add 0.15 parts by mass of the solid sample obtained in step (2) into 100 parts by volume of 0.75 g / L ammonium tetrathiomolybdate solution, and stir at room temperature for 36 hours. After the reaction, the obtained solid sample was washed several times with deionized water, and then vacuum-dried for 24 hours to...

Embodiment 3

[0052] (1) After adding 0.167 parts by mass of polyvinylimidazole to 15 parts by volume of 28wt% urea solution for dissolution, add 25 parts by mass of 2wt% cellulose solution (7wt% sodium hydroxide, 12wt% urea), and stir for 8 hours at room temperature well mixed.

[0053] (2) Take 2 parts by volume of epichlorohydrin and add it to the system of step (1), so that the mass volume ratio of cellulose, polyvinylimidazole, and epichlorohydrin is 3:2:12, after stirring for 3 hours at 0°C , the obtained transparent solution was placed in an oven at 70° C. for 4 h, and the obtained solid sample was washed several times with deionized water and tert-butanol, and then freeze-dried.

[0054] (3) Add 0.2 parts by mass of the solid sample obtained in step (2) into 100 parts by volume of 0.75 g / L ammonium tetrathiomolybdate solution, and stir at room temperature for 48 hours. After the reaction, the obtained solid sample was washed several times with deionized water, and then freeze-dried...

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Abstract

The invention belongs to the technical field of water treatment, and in particular relates to a nitrogen / sulfur co-doped porous cellulose adsorbent which can be used for treating chromium-containing wastewater, a preparation method and application thereof. The preparation method of the present invention comprises the following steps: (1) polyvinylimidazole monomer is polymerized to obtain polyvinylimidazole; (2) cellulose and polyvinylimidazole are reacted in one step to obtain quaternary ammonium salt functionalized cellulose; (3) quaternary ammonium salt Functionalized cellulose was ion-exchanged with ammonium tetrathiomolybdate solution to obtain nitrogen / sulfur co-doped cellulose adsorbent. The preparation method of the present invention uses renewable resources as raw materials, has a wide range of sources, is cheap, and conforms to the concept of green environmental protection. The prepared nitrogen / sulfur co-doped porous cellulose adsorbent has excellent adsorption rate for hexavalent chromium, Adsorption capacity and affinity, large adsorption capacity, can be used in the treatment of chromium-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a nitrogen / sulfur co-doped porous cellulose adsorbent which can be used for treating chromium-containing wastewater, a preparation method and application thereof. Background technique [0002] The rapid development of industry has produced a large amount of wastewater, among which heavy metal ion pollutants seriously restrict economic development and have become a major issue affecting human health and ecological balance. Over the past few decades, chromium has been widely used in industries such as metallurgy, electroplating, metal processing, steel manufacturing, power generation, leather tanning and textiles. These applications lead to the release of chromium ions into the natural environment. Chromium ions can directly damage water quality, cause poisoning of aquatic organisms, and can also migrate into the human body through the food chain, endangering h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J20/28011B01J20/28054B01J20/3085C02F1/286C02F2101/22
Inventor 陈砺彭雄严宗诚刘术俊
Owner SOUTH CHINA UNIV OF TECH
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