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Preparation method and application of lignin-doped metal organic framework derived carbon-iron composite material

A composite material and lignin technology, applied in the field of heterogeneous adsorbents, can solve the problems of insufficient adsorption rate, capacity and recirculation, and achieve the effects of enhanced transmission and capture capabilities, rapid separation, and improved graphitization

Pending Publication Date: 2021-10-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing adsorbents are still deficient due to insufficient adsorption rate, capacity, and recyclability, and more suitable adsorbents are urgently needed.

Method used

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  • Preparation method and application of lignin-doped metal organic framework derived carbon-iron composite material
  • Preparation method and application of lignin-doped metal organic framework derived carbon-iron composite material
  • Preparation method and application of lignin-doped metal organic framework derived carbon-iron composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of MIL-101-NH 2 (Fe):

[0034] 1.35 g FeCl 3 ·6H 2 O was dissolved in 15 mL DMF to obtain solution A; then 0.45 g of 2-aminoterephthalic acid was dissolved in 15 mL DMF to obtain solution B; solution A was poured into solution B; the two were evenly mixed and poured into 50 ml In a hydrothermal kettle, conduct a hydrothermal reaction at 110 °C for 24 h; centrifuge the reaction solution, wash the obtained precipitate twice with DMF, water, and ethanol in sequence, and dry it in an oven at 70 °C to obtain a brown powder, namely MIL-101 -NH 2 (Fe).

Embodiment 2

[0036] Preparation of Carbon-MIL-101-NH 2 :

[0037] 600 mg of MIL-101-NH 2 The (Fe) brown powder was put into a porcelain boat, calcined in a tube furnace under a nitrogen atmosphere, heated at 3 °C to 700 °C per minute, and then kept for 1 h. 2 Cool to room temperature under atmosphere. The black powder is washed with water, then magnetically separated, and dried at 70 ℃, namely Carbon-MIL-101-NH 2 .

Embodiment 3

[0039] Preparation of Carbon-Fe 3 C / lignin:

[0040] 400 mg of MIL-101-NH 2 (Fe) The brown powder was placed in a mortar, mixed with 200 mg lignin powder, and ground for 10 min until completely mixed. Put 600 mg of completely mixed powder into a porcelain boat, calcined in a tube furnace under a nitrogen atmosphere, heated at 3 °C to 700 °C per minute, and then kept it for 1 h. 2 Cool to room temperature under atmosphere. The black powder is washed with water, then magnetically separated, and dried at 70 °C, namely Carbon-Fe 3 C / lignin.

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Abstract

The invention provides a preparation method and application of a lignin-doped metal organic framework (MOF)-derived carbon-iron composite material. The material can be used as an adsorbent for various antibiotics and heavy metal hexavalent chromium ions under wide pH conditions. The material is synthesized by taking a mixture of MOF and lignin as a precursor and adopting a one-step pyrolysis method, and iron nanoparticles in the obtained material are uniformly loaded on the surface of an ultrathin carbon nanosheet with a porous structure. The doping of lignin improves the specific surface area and graphitization degree of the carbon material, can effectively enhance the transmission and capture capabilities of substances, is beneficial to dispersion of iron nanoparticles, minimizes particle aggregation, provides additional stability for the iron nanoparticles, and is used as a secondary adsorption site of antibiotics and heavy metal hexavalent chromium ions. Meanwhile, the material has magnetism and can be quickly and conveniently recycled from a water phase. When being applied to adsorption of antibiotics and heavy metal hexavalent chromium ions, the composite material shows excellent adsorption performance.

Description

technical field [0001] The invention relates to a heterogeneous adsorbent which can be used for antibiotic and hexavalent chromium ion waste water under wide pH conditions, and belongs to the technical field of adsorption. Background technique [0002] Antibiotics are widely used in medicine, agriculture, animal husbandry, and aquaculture because of their bactericidal and antibacterial effects. However, due to people's blind abuse of them, antibiotics accumulate in animals and are eventually discharged into the environment. Also, because it is widely used in various industrial fields, trace amounts of hexavalent chromium can cause carcinogenesis and mutation in humans and animals, posing a threat to the environment and human health. [0003] So far, effective methods for removing antibiotics and hexavalent chromium mainly include adsorption, photocatalysis, Fenton-like, membrane filtration, biodegradation, and electrochemical degradation. Among these methods, adsorption has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/30C02F101/22
CPCB01J20/205B01J20/28009B01J20/3085B01J20/3078B01J20/3071C02F1/288B01J2220/4837C02F2101/30C02F2101/22
Inventor 刘达顾文怡刘勇弟雷菊英张金龙周亮周雯奇贺文佳刘礼政徐颖
Owner EAST CHINA UNIV OF SCI & TECH
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