Cross-linked cellulose@molybdenum disulfide aerogel composite adsorbent as well as preparation method and application thereof

A technology of cellulose airgel and molybdenum disulfide, applied in chemical instruments and methods, alkali metal compounds, adsorbed water/sewage treatment, etc., to achieve excellent adsorption capacity, excellent lead ion adsorption performance and adsorption selectivity, and solve the problem of water big damage effect

Active Publication Date: 2021-11-23
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-scale molybdenum disulfide particles are loaded onto mm / cm-scale cross-linked cellulose airgel, which successfully overcomes the problems of excessive pressure drop and poor mechanical strength of pure molybdenum disulfide powder applied to fluid water treatment systems. defects, significantly improved the hydraulic properties of molybdenum disulfide and can be easily separated and recovered from the solution

Method used

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  • Cross-linked cellulose@molybdenum disulfide aerogel composite adsorbent as well as preparation method and application thereof
  • Cross-linked cellulose@molybdenum disulfide aerogel composite adsorbent as well as preparation method and application thereof
  • Cross-linked cellulose@molybdenum disulfide aerogel composite adsorbent as well as preparation method and application thereof

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preparation example Construction

[0032] A crosslinked cellulose @ disulfide molybdenum gel composite adsorbent is obtained by negative laminar molybdenum sulfide nanoparticles on the carrier; the carrier is a porous structure generated by cellulose crosslinked by epoxy chloropropane. The cellulose airgel, the inside of the carrier pore and the surface are uniformly distributed with a splitonal molybdenum nanoparticle; the innermost diameter of the carrier is 50-500 μm; the antlyptallidide nano particle size is 20-400 nm. The preparation method of the adsorbent includes the steps of:

[0033](1) The cellulose is added to a sodium hydroxide / urea mixture pre-cooled to -12 ° C, and the clear and transparent cellulose solution is obtained after high-speed stirring at 1000-2500 rpm; hydroxide in the sodium hydroxide / urea solution. The sodium mass fraction is 7-9 wt%, the urea mass fraction is 12-14 wt%; the ratio of the quality of the cellulose and the volume of sodium hydroxide / urea mixed solution is 30-50 μg / ...

Embodiment 1

[0037] Example 1: Crosslinked cellulose @ 二 二 molybdenum gel composite adsorbent

[0038] Step (1): Take 5 g of cellulose dissolved in 7 wt% / 9 wt% of 100 g of a 7 wt% / 9 wt% sodium hydroxide / urea mixed solution, stirring at high speed at 2000 rpm to give a clear and clear cellulose solution.

[0039] Step (2): Take 8G MOS 2 In the cellulose solution obtained from step (1), ultrasonic stirring was 30 min to obtain a uniformly dispersed diombite / cellulose suspension.

[0040] Step (3): Add 15 mL of epoxy chloropropane to step (2) to the mixing solution obtained using a peristaltic pump, followed by stirring at 300 rpm, and the resulting mixed solution is reacted at 60 ° C for 2 h.

[0041] Step (4): Use deionized water and anhydrous ethanol to remove the hydrogel obtained by step (3) to neutral, pre-freeze at -35 ° C for 12 h, then vacuum dried at -50 ° C to obtain a sulfide solution Floor cellulose airgel composite adsorbent.

[0042] like figure 1 As shown, the scanning ele...

Embodiment 2

[0043] Example 2: Crosslinked cellulose @ 二 钼 钼 复 吸 吸 吸 吸 应用 子 吸 附

[0044] 25mg Ca @ MOS 2 The composite adsorbents were added to 50 ml of different concentrations of lead ion solution, and the solution concentration ranged from 5 to 500 mg / g, and the temperature of 25 ° C and 45 ° C, pH were controlled at 4.5 ± 0.3. Elever 24 hours to ensure adsorption balance. Take the supernatant to measure the residual lead ion concentration of the solution, resulting in a balanced adsorption amount at different initial lead ion concentrations, and the maximum adsorption amount at 25 ° C is 160 mg / g, 45 ° C is sucking up to 180 mg / g.

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Abstract

The invention discloses a cross-linked cellulose@molybdenum disulfide aerogel composite adsorbent as well as a preparation method and application thereof. Cross-linked cellulose aerogel serves as a carrier, and molybdenum disulfide nanoparticles are directly doped into cellulose suspension liquid through a premixing-cross-linking fixing-freezing pore forming method; and then a cross-linking agent is added to enable cellulose to form a three-dimensional network structure to fix the molybdenum disulfide particles. According to the invention, the technical bottleneck of nanoscale molybdenum disulfide powder in practical engineering application is solved, and good hydraulic properties of the carrier and excellent adsorption selectivity of molybdenum disulfide to lead ions are combined together. And the composite adsorbent has excellent adsorption capacity and rapid adsorption kinetics on the lead ions. The adsorption saturated material can be desorbed and regenerated through an EDTANa2 solution to be repeatedly used, can be stably used in a fixed bed flow system, and has a relatively wide application prospect.

Description

Technical field [0001] The present invention belongs to the field of new composite adsorbent materials, and more particularly to a crosslinked cellulose @ 二 化 molybdenum gel composite adsorbent and a preparation method thereof. Background technique [0002] As the world's industrialization is constantly deepening, a variety of industries have a large number of heavy metals (such as PB) every year. 2+ Cu 2+ , CD 2+ Hg 2+ Waste water, thereby causing potential toxicology harm to the human body. Because of its high toxicity, biological accumulation, non-degradability has been concerned. Therefore, a new adsorbent capable of efficiently treating lead waste is important for the protection of ecological environment and human health. [0003] At present, the treatment of lead wastewater mainly includes chemical precipitation, adsorption, electrical gheriff, membrane separation method. Adsorption method has been considered to be one of the most effective methods for treating lead waste d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/0285B01J20/0218B01J20/28047C02F1/281C02F1/286C02F2101/20
Inventor 聂广泽仇世俊王翔郝子伦
Owner NANJING TECH UNIV
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