Method for improving selective extraction capacity of body type carbon fiber

A technology of extraction capacity and selectivity, applied in the field of environmental chemistry, can solve problems such as complex components, and achieve the effects of increasing relative content, improving adsorption performance, and enhancing polarity

Inactive Publication Date: 2011-06-01
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many kinds of organic environmental pollutants and their components are complex. How to achieve the ability to selectively extract the environmental pollutants containing acidic components, improve the linear range of the analysis method, and reduce the detection limit of the analytical object is the technical solution in this patent application. unresolved

Method used

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  • Method for improving selective extraction capacity of body type carbon fiber
  • Method for improving selective extraction capacity of body type carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0022] This embodiment includes the following steps:

[0023] Step 1, take the body-shaped carbon fiber, and make a body-shaped carbon fiber rod with a diameter of 2mm and a length of 10mm by molding;

[0024] In proportion by weight, 2 parts of hydroxylamine and 1.5 parts of ammonia water with a weight fraction of 17% are mixed as the solute, and then diluted with water to obtain an aqueous solution with a weight percentage of 60% of the solute, which is the modifier;

[0025] Soak the body-shaped carbon fiber rods with a modifier, the volume of the modifier is three times that of the body-shaped carbon fiber rods, and the soaking time is 40 hours; then dry at 100°C for 2.5 hours;

[0026] Step 2: Under the protection of nitrogen, the body-shaped carbon fibers obtained in Step 1 were subjected to the following operations in sequence: heat preservation at 800°C for 2.5 hours; Minutes, the water temperature is at room temperature; after washing, dry in an oven at 103°C for 2.6...

Embodiment 2

[0029] This embodiment includes the following steps:

[0030] Step 1, take the body-shaped carbon fiber, and make a body-shaped carbon fiber rod with a diameter of 2mm and a length of 10mm by molding;

[0031] According to the weight ratio, 1 part of hydroxylamine is mixed with 4.5 parts of ammonia water with a weight fraction of 17% as the solute, and then diluted with water to obtain an aqueous solution with a weight percentage of the solute of 38%, which is the modifier;

[0032] Soak body-shaped carbon fiber rods with a modifier, the volume of the modifier is twice that of the body-shaped carbon fiber rods, and the soaking time is 20 hours; then dry at 100°C for 2 hours;

[0033] Step 2: Under the protection of nitrogen, the body-shaped carbon fibers obtained in Step 1 were subjected to the following operations in sequence: heat preservation at 750°C for 1.5 hours; Minutes, the water temperature is at room temperature; after washing, place it in an oven and dry it at 105°...

Embodiment 3

[0036] This embodiment includes the following steps:

[0037] Step 1, take the body-shaped carbon fiber, and make a body-shaped carbon fiber rod with a diameter of 2mm and a length of 10mm by molding;

[0038] According to the weight ratio, take 1.5 parts of hydroxylamine and mix 5 parts of ammonia water with a weight fraction of 17% as the solute, then add water to dilute to obtain an aqueous solution with a weight percentage of the solute of 45%, which is the modifier;

[0039] Soak the body-shaped carbon fiber rods with a modifier, the volume of the modifier is 2.5 times that of the body-shaped carbon fiber rods, and the soaking time is 25 hours; then dry at 100°C for 3 hours;

[0040] Step 2: Under the protection of nitrogen, the body-shaped carbon fibers obtained in Step 1 were subjected to the following operations in sequence: heat preservation at 400°C for 3 hours; Minutes, the water temperature is at room temperature; after washing, dry in an oven at 100°C for 3 hours...

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Abstract

The invention discloses a method for improving selective extraction capacity of body type carbon fiber in environmental chemistry field, comprising the following steps: 1. taking the body type carbon fiber, adopting modifier for soaking and then drying, wherein, the modifier is prepared by the following steps: mixing hydroxylamine and ammonia which are taken as a solute, adding water for dilutingto obtain aqueous solution, namely the modifier; and 2. carrying out heat preservation, cooling, washing, and drying on the body type carbon fiber obtained in the step 1 under the protection of inertgas to obtain the active body type carbon fiber finally; the relative content of alkaline group of the body type carbon fiber can be improved after the treatment by the method of the invention, and the polarity on the surface is enhanced, thus improving the adsorption property of the body type carbon fiber to the polar substances; and the modified body type carbon fiber has the abilities of preferential extraction and acidulous substances under the condition that various pollutants coexist.

Description

technical field [0001] The invention relates to a method in the technical field of environmental chemistry, in particular to a method for improving the selective extraction ability of body-shaped carbon fibers. Background technique [0002] Solid phase microextraction (SPME) is a sample pretreatment technology proposed and developed in the early 1990s. It has the advantages of fast, sensitive, convenient, solvent-free and easy to automate. There are many organic environmental pollutants determined by SPME technology at home and abroad. , but generally commercial fibers are used as extraction fibers. At present, commercial extraction fibers mainly include coated extraction fibers such as polydimethylsiloxane and polyacrylic acid, which have short service life (≤100 times), high price, and intolerance. The shortcomings of high temperature (≤280°C) and organic solvents make it difficult to apply this technology on a large scale. [0003] The more acidic compounds in the oxygen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/32
Inventor 张旭孙同华陆封烽
Owner SHANGHAI JIAOTONG UNIV
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