CN101239304A - Method for preparing modified expanded graphite and application in treating to formaldehyde gas - Google Patents
Method for preparing modified expanded graphite and application in treating to formaldehyde gas Download PDFInfo
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- CN101239304A CN101239304A CNA2008100196257A CN200810019625A CN101239304A CN 101239304 A CN101239304 A CN 101239304A CN A2008100196257 A CNA2008100196257 A CN A2008100196257A CN 200810019625 A CN200810019625 A CN 200810019625A CN 101239304 A CN101239304 A CN 101239304A
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- expanded graphite
- expandable graphite
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Abstract
The present invention provides a preparing of modifying expandable graphite and its application field, a preparing method of modifying expandable graphite, characterized in that scaling a certain expandable graphite made by natural crystalline flake graphite soaking in an alkaline solution in a certain proportion, filtering, drying after a certain time. The proportion of the expandable graphite and the alkaline solution is 9:1-9:3, soaking period is 3-9 hours, the drying temperature is 100-150 Celsius degree, drying, getting and cooling, modifying expandable graphite is obtained, applied in the interior gas absorption treatment of formaldehyde. Since the modifying expandable graphite by alkaline solution having higher hole capacity, increasing surface activate position, lavish function group loading on the surface, the absorption ability of the formaldehyde is enhanced, and used for room air purification.
Description
Technical field
The present invention relates to the preparation and the application thereof of modified expanded graphite, refer in particular to a kind of preparation method and application aspect the formaldehyde gas processing thereof of modified expanded graphite.
Background technology
Expanded graphite is a kind of cheapness and the extremely wide material of purposes is widely used in encapsulant, conductive material, sorbing material, fire-retardant fireproof material, catalysis material, medical material etc., especially on waste liquid, treatment of waste gas.Along with increasing the weight of day by day of environmental pollution, also more and more higher to the requirement of environment-friendly materials, therefore, sorbing material can not be confined on traditional disposal ability traditional material be carried out modification, improves the focus that the ability of handling waste gas and waste liquid becomes Recent study.Along with the raising of people's living standard, the use of a large amount of ornament materials, it is more and more serious that indoor organic matter is polluted, and mainly is formaldehyde and triphen (benzene,toluene,xylene).Traditional sorbing material mainly contains active carbon, NACF, zeolite etc., and these sorbing material adsorption capacities are relatively poor.Expanded graphite provides condition based on the pore structure of its distinctive big mesopore for form polymolecular layer absorption and even cohesion in the hole, and the hole permeability that more has expanded graphite concurrently is good, and processing speed is fast, therefore, can substitute traditional sorbing material.The processing of relevant modified expanded graphite PARA FORMALDEHYDE PRILLS(91,95) gas yet there are no report.
Summary of the invention
The present invention will carry out surface modification with ammoniacal liquor with the prepared expanded graphite of natural flake graphite.By optimizing the ratio of expanded graphite and ammoniacal liquor, dip time, technological parameters such as bake out temperature and oven dry make expanded graphite area load nitrogen-containing functional group.
Specific embodiment of the present invention is: the expanded graphite of getting preparation is immersed in a certain proportion of ammoniacal liquor, filters behind the certain hour, dries.Wherein the ratio of expanded graphite and ammoniacal liquor is 9: 1～9: 3, and dip time is 3～9h, and bake out temperature is 100～150 ℃, and cooling is taken out in oven dry, promptly obtains modified expanded graphite.Prepared modified expanded graphite is used for the static state of PARA FORMALDEHYDE PRILLS(91,95) and dynamically absorption.
The modified expanded graphite that the present invention prepares is the expanded graphite through ammoniacal liquor dipping, and ammoniacal liquor has etching action to the expanded graphite surface, and specific area is increased, and has increased surperficial activity, makes adsorbate that polymolecular layer take place in the hole and adsorbs and even condense.
Formaldehyde contains the carbonyl polar group, be the polarity adsorbate, and expanded graphite is surperficial nonpolar non-polar adsorbent, and lower to the adsorption capacity of polarity adsorbate, the expanded graphite after the ammoniacal liquor modification has been introduced nitrogen-containing functional group on the expanded graphite surface.
The invention has the advantages that: improved pore volume through the expanded graphite after the alkaline solution modification, increased surface-active, area load rich functional groups, therefore improved the adsorption capacity of PARA FORMALDEHYDE PRILLS(91,95), can be used for the purification of room air.
Description of drawings
The SEM photo of expanded graphite pore structure before and after Fig. 1 modification
The static adsorption curve of expanded graphite and active carbon PARA FORMALDEHYDE PRILLS(91,95) before and after Fig. 2 modification
The dynamic adsorption curve of expanded graphite PARA FORMALDEHYDE PRILLS(91,95) before and after Fig. 3 modification
The specific embodiment
Embodiment 1: natural flake graphite is extremely neutral through the washed with de-ionized water several, and oven dry adopts the secondary oxidation method to carry out oxidation, intercalation, washs, dries, and makes expanded graphite.The expanded graphite that makes is carried out surface modification with ammoniacal liquor, and the ratio of expanded graphite and ammoniacal liquor is 9: 1, and soak time is 3h, and the deionized water washing makes modified expanded graphite to neutral, 100 ℃ of oven dry.With the modified expanded graphite that makes at room temperature PARA FORMALDEHYDE PRILLS(91,95) gas carry out static adsorption test, maximal absorptive capacity can reach 320mg/g.
Embodiment 2: according to the preparation method described in the embodiment 1, change the ratio of expanded graphite and ammoniacal liquor into 9: 2, soak time changes 6h into, and the deionized water washing makes modified expanded graphite to neutral, 120 ℃ of oven dry.With the modified expanded graphite that makes at room temperature PARA FORMALDEHYDE PRILLS(91,95) gas carry out static adsorption test, maximal absorptive capacity can reach 1000mg/g.
Embodiment 3: according to the preparation method described in the embodiment 1, change the ratio of expanded graphite and ammoniacal liquor into 9: 3, soak time changes 9h into, and the deionized water washing makes modified expanded graphite to neutral, 150 ℃ of oven dry.With the modified expanded graphite that makes at room temperature PARA FORMALDEHYDE PRILLS(91,95) gas carry out static adsorption test, maximal absorptive capacity can reach 400mg/g.
Comparative Examples: the expanded graphite that will adopt the secondary oxidation method to make carries out surface modification through best modified technique, and the static state of expanded graphite modified front and back PARA FORMALDEHYDE PRILLS(91,95) and dynamic adsorption are seen accompanying drawing 2 and accompanying drawing 3.
Claims (2)
1. the preparation method of modified expanded graphite, it is characterized in that taking by weighing a certain amount of is that the expanded graphite of feedstock production is immersed in a certain proportion of ammoniacal liquor with the natural flake graphite, filter behind the certain hour, dry, wherein expanded graphite and ammoniacal liquor ratio are 9: 1～9: 3, soak time is 3～9h, and bake out temperature is 100～150 ℃, oven dry, take out cooling, obtain modified expanded graphite.
2. the modified expanded graphite for preparing according to claim 1 is applied to the adsorption treatment of PARA FORMALDEHYDE PRILLS(91,95) in the indoor gas, it is characterized in that carrying out static state and dynamically absorption with the modified expanded graphite PARA FORMALDEHYDE PRILLS(91,95) of preparation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100196257A CN101239304A (en) | 2008-03-10 | 2008-03-10 | Method for preparing modified expanded graphite and application in treating to formaldehyde gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100196257A CN101239304A (en) | 2008-03-10 | 2008-03-10 | Method for preparing modified expanded graphite and application in treating to formaldehyde gas |
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| CN101239304A true CN101239304A (en) | 2008-08-13 |
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| CNA2008100196257A Pending CN101239304A (en) | 2008-03-10 | 2008-03-10 | Method for preparing modified expanded graphite and application in treating to formaldehyde gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102533715A (en) * | 2012-01-09 | 2012-07-04 | 同济大学 | Method for preparing biological expanded graphite with visible light catalytic activity |
| CN102974306A (en) * | 2012-12-24 | 2013-03-20 | 武汉理工大学 | Modification method for improving oxymethylene adsorbing property of honeycomb ceramics |
| CN106941167A (en) * | 2017-04-17 | 2017-07-11 | 中航锂电（洛阳）有限公司 | A kind of porous composite negative pole material of lithium ion battery and preparation method thereof |
| CN109569519A (en) * | 2018-10-22 | 2019-04-05 | 江汉大学 | The method for preparing active sludge carbon base formaldehyde adsorbent using municipal sludge |
| CN113694898A (en) * | 2021-10-13 | 2021-11-26 | 黑龙江省科学院高技术研究院 | Preparation method of linear alkyl modified expanded graphite |
-
2008
- 2008-03-10 CN CNA2008100196257A patent/CN101239304A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102533715A (en) * | 2012-01-09 | 2012-07-04 | 同济大学 | Method for preparing biological expanded graphite with visible light catalytic activity |
| CN102533715B (en) * | 2012-01-09 | 2013-07-17 | 同济大学 | Method for preparing biological expanded graphite with visible light catalytic activity |
| CN102974306A (en) * | 2012-12-24 | 2013-03-20 | 武汉理工大学 | Modification method for improving oxymethylene adsorbing property of honeycomb ceramics |
| CN106941167A (en) * | 2017-04-17 | 2017-07-11 | 中航锂电（洛阳）有限公司 | A kind of porous composite negative pole material of lithium ion battery and preparation method thereof |
| CN109569519A (en) * | 2018-10-22 | 2019-04-05 | 江汉大学 | The method for preparing active sludge carbon base formaldehyde adsorbent using municipal sludge |
| CN113694898A (en) * | 2021-10-13 | 2021-11-26 | 黑龙江省科学院高技术研究院 | Preparation method of linear alkyl modified expanded graphite |
| CN113694898B (en) * | 2021-10-13 | 2023-08-22 | 黑龙江省科学院高技术研究院 | Preparation method of linear alkyl modified expanded graphite |
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Open date: 20080813 |