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Carboxyl modified graphene oxide-metal organic framework composite material and preparation method and application thereof

A metal-organic framework and composite material technology, which is applied in the field of carboxyl-modified graphene oxide@metal-organic framework composite material and its preparation, can solve the problems of limited number of functional groups, low rare earth adsorption capacity, etc., and achieves fast adsorption speed and application range. Wide and high separation efficiency

Inactive Publication Date: 2020-06-12
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the number of functional groups on pure MOFs is limited, and the adsorption capacity for rare earths is relatively low.

Method used

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  • Carboxyl modified graphene oxide-metal organic framework composite material and preparation method and application thereof
  • Carboxyl modified graphene oxide-metal organic framework composite material and preparation method and application thereof
  • Carboxyl modified graphene oxide-metal organic framework composite material and preparation method and application thereof

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Effect test

Embodiment 1

[0034] Example 1 A carboxyl-modified graphene oxide@metal-organic framework composite material

[0035] (1) Carboxyl-modified graphene oxide@metal-organic framework composite GO-COOH-X@UIO-66-NH 2 preparation of

[0036] Synthetic process such as figure 1 shown.

[0037] The preparation method is as follows:

[0038] 1) Preparation of graphene oxide: Mix 180mL of concentrated sulfuric acid, 20mL of concentrated phosphoric acid and 1.5g of graphite powder in an ice bath for 20 minutes, then slowly add 15g of potassium permanganate, slowly heat the solution to 323K, and react for 6 hours. Then the solution was cooled to room temperature and slowly poured into ice water and stirred evenly. Add hydrogen peroxide dropwise to the above solution until the color of the solution changes from earthy yellow to golden yellow, then stop the dropwise addition, and the golden yellow material is graphene oxide.

[0039] 2) Synthesis of carboxyl-modified graphene oxide: the graphene oxide...

Embodiment 2

[0045] Example 2 Carboxyl-modified graphene oxide@metal-organic framework composite material recovery of neodymium

[0046] (1) The effect of the amount of carboxyl-modified graphene oxide on the adsorption performance of Nd(III)

[0047] Method: Take 5 mg of the composite material GO-COOH-9@UIO-66-NH prepared in Example 1 2 、GO-COOH-17@UIO-66-NH 2 、GO-COOH-23@UIO-66-NH 2 、GO-COOH-33@UIO-66-NH 2 、GO-COOH-44X@UIO-66-NH 2 、GO-COOH-50@UIO-66-NH 2 , add 5mL each, 30mg·L -1 Nd(III) solution, shake it in the shaking box for 24h under 303K, the result is as follows Figure 4 shown. As the amount of GO-COOH added increased, the amount of Nd(III) adsorbed by the material also increased. When the amount of GO-COOH added is 80 mg, that is, when X=44, the composite material reaches a higher adsorption capacity, and the adsorption rate of the material does not change significantly when the amount of GO-COOH added continues to increase. This is due to the fact that the surface of G...

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Abstract

The invention relates to the technical field of environment and chemical engineering, in particular to a carboxyl modified graphene oxide-metal organic framework composite material and a preparation method and application thereof. According to the composite material, chloroacetic acid modified graphene oxide GO-COOH-X and a metal organic framework UIO-66-NH2 are compounded, X represents the mass percentage of GO-COOH in the composite material, and X is equal to 9%, 17%, 23%, 33%, 44% and 50%. The metal organic framework is used as a matrix, and carboxyl modified graphene oxide is used as an adsorption functional group to synthesize the adsorbent. The adsorbent has the advantages of simple preparation method, strong regeneration capability, good stability, very high adsorption capacity on Nd (III), wide application range and practical applicability, and the maximum adsorption capacity can reach 146mg. g <-1 >.

Description

technical field [0001] The invention relates to the field of environment and chemical technology, in particular to a carboxyl-modified graphene oxide@metal-organic framework composite material and its preparation method and application. Background technique [0002] Rare earth (Rare Earth) is the abbreviation of rare earth elements, which is the third subgroup in the chemical periodic table (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium ) and its similar properties (scandium and yttrium) a total of seventeen metal elements. According to the electronic layer structure and physical and chemical properties of rare earth elements, rare earth elements are divided into: light rare earth (lanthanum, cerium, praseodymium, neodymium, promethium), medium rare earth (samarium, europium, gadolinium, terbium, dysprosium) and heavy rare earth ( holmium, erbium, thulium, ytterbium,...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01D15/08B01J20/30
CPCB01D15/08B01J20/20B01J20/223
Inventor 娄振宁阚丽欣赵雯艳单炜军于海彪崔俊硕王月娇熊英
Owner LIAONING UNIVERSITY
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