CN106423065A - Post-treatment method for increasing specific surface area of bio-carbon effective pores - Google Patents
Post-treatment method for increasing specific surface area of bio-carbon effective pores Download PDFInfo
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- CN106423065A CN106423065A CN201611038099.XA CN201611038099A CN106423065A CN 106423065 A CN106423065 A CN 106423065A CN 201611038099 A CN201611038099 A CN 201611038099A CN 106423065 A CN106423065 A CN 106423065A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/305—Addition of material, later completely removed, e.g. as result of heat treatment, leaching or washing, e.g. for forming pores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
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Abstract
The present invention relates to a post-treatment method for increasing the specific surface area of the bio-carbon effective pores and belongs to the technical field of chemical or physical methods. The method includes placing bio-carbon into a pyrolysis furnace, and inputting a certain volume ratio of nitrogen and air mixed gas at a certain flow; after heat treatment for some time, adding the resulting solid and the proper amount of active alumina ball together into the water, stirring at room temperature after chambering for some time, removing the active alumina ball, filtering out the solid, washing and drying to get the product. The method can be applied to bio-carbon post-treatment, which can significantly improve the adsorption and removal efficiency of biochar to organic pollutants such as pesticides.
Description
Technical field
The present invention relates to a kind of post-processing approach improving the effective pore specific surface area of charcoal, belong to chemically or physically method
Technical field.
Background technology
Charcoal be using the agricultures such as wood flour, straw, feces of livestock and poultry, woods, aquaculture residue or plant residue be raw material,
It is pyrolyzed a kind of stable black high carbonaceous solids product obtaining under uniform temperature (300～800 DEG C), produce to improve charcoal
The yield of product, pyrolytic reaction generally carries out (ZL201310218454.1 in the protective atmospheres such as nitrogen；ZL
201410120718.4).Due to the exclusive 26S Proteasome Structure and Function feature of charcoal, repair in carbon dioxide sequestration, soil improvement, environment
The multiple fields such as multiple, resource recycling show wide application prospect.Especially, charcoal has abundant microcellular structure
With larger specific surface area, it is a kind of cheap and efficient adsorbent, aromatic hydrocarbons, pesticide, dyestuff, antibiotic etc. can be adsorbed multiple
Organic pollution, has broad application prospects in the adsorption treatment technology of these pollutant.
But, adopt in the charcoal obtained by conventional pyrolysis technique with micropore (aperture<2nm) based on structure, and in a large number
Micropore is in irregular slit-shaped, leads to charcoal not enough to the absorbability of the pollutant such as pesticide, antibiotic.Reason is,
Different from the small molecule aromatic hydrocarbons pollutant such as benzene, toluene, Nitrobenzol, the organic molecule such as most pesticide, antibiotic relative
Molecular mass is higher, often greater than 250g/mol, and the such as relative molecular mass of herbicide tribenuron-methyl is 395g/mol, their molecule
Size is usually more than 1nm.This kind of molecular dimension hardly enters the too little charcoal in aperture in the organic pollutant molecule of more than 1nm
In micropore, and effective hole active to absorbability belong to aperture more than 1.7nm mesopore (Dong Lihua, etc. feedwater
Draining, 2014,40:91-94).That is, a large amount of micropore surfaces in charcoal cannot be by Organic substances such as pesticide, antibiotic
Molecule utilizes, and contributes very little to adsorbing this type organic.Therefore, the energy of adsorption to pollutant such as herbicide, antibiotic for the charcoal
Power depends primarily on the size of effective hole (aperture is 1.7～50nm) specific surface area in charcoal.
In view of this it is necessary to develop effective charcoal post-processing technology, to improve effective hole in charcoal, (aperture is
1.7～50nm) specific surface area, to prepare the common organic pollution to pesticide, antibiotic etc., there is the life of more high absorption capacity
Thing charcoal, thus expand purposes in adsorption treatment pollutant for the charcoal, improve removal efficiency simultaneously.
Based on this, make the application.
Content of the invention
For the drawbacks described above in the presence of the processing of existing charcoal, the application provides one kind can improve the effective hole of charcoal
The post-processing approach of (aperture is 1.7～50nm) specific surface area, for improving charcoal to organic pollutions such as pesticide, antibiotic
Adsorption efficiency.
For achieving the above object, the technical scheme that the application takes is as follows：
A kind of post-processing approach improving the effective pore specific surface area of charcoal, charcoal is put in heat-treatment furnace, with one
Constant flow is passed through nitrogen and the air gas mixture of certain volume ratio, heat treatment for a period of time after, by gained solidss and appropriate
Active oxidation aluminium ball is put in water together, room temperature expanding treatment for a period of time after, take out active oxidation aluminium ball, leach solidss,
Refined charcoal product is obtained after washing, drying.
Further, as preferred：
Described biology carbon feedstock is with the biomass of the rich cellulose such as wood flour, lignin etc. as raw material, through limit oxygen pyrolysis
The high carbonaceous solids product of preparation.
Tube furnace selected by described heat-treatment furnace, and it is 5 that mixed gas therein consist of nitrogen with the volume ratio of air:1
～1:5, for 3～10 boiler tube volumes per hour, (size depends on boiler tube model to the flow of mixed gas, with Φ 8cm × 100cm
As a example boiler tube, its boiler tube volume is 5L), heat treatment temperature is 200～500 DEG C, and temperature retention time is 0.5～6h.It is furthermore preferred that institute
The nitrogen stated is 2 with the volume ratio of air:1～1:2, the flow of mixed gas is 4～7 boiler tube volumes per hour, heat treatment
Temperature is 300～400 DEG C, and temperature retention time is 1～3h.
Described room temperature expanding treatment is that the solidss after heat treatment are put into together with active oxidation aluminium ball stirring in water.
The particle diameter of active oxidation aluminium ball used is 1～5mm, and active oxidation aluminium ball is 5 with the mass ratio of charcoal:1～1:1, water with
The mass ratio of active oxidation aluminium ball is 30:1～5:1.The described room temperature expanding treatment time is 2～72h.It is furthermore preferred that it is described
The mass ratio of active oxidation aluminium ball and charcoal be 3:1～1:1.
A kind of post-processing approach of the effective pore specific surface area of raising charcoal provided herein, specially：By biology
Charcoal is put in tube furnace, is passed through volume ratio for 5 with the flow of per hour 3～10 boiler tube volumes:1～1:5 nitrogen and air
Mixed gas, are simultaneously heated to 200～500 DEG C, after heat treatment 0.5～6h, by particle diameter be 1～5mm active oxidation aluminium ball and
Charcoal in mass ratio 5:1～1:1 puts in water together, after stirring 2～72h under room temperature, takes out active oxidation aluminium ball, leaches solid
Body thing, washing, obtain refined charcoal product after drying at 90～120 DEG C.
The operation principle of charcoal post-processing approach of the application and having the beneficial effect that：
1) the application heat treatment biology carbon feedstock in the mixed gas with air for the nitrogen, by controlling the group of mixed gas
Become and flow, on the one hand, the partial oxidation contained by the air occurs ablation to the micro-pore wall in charcoal in heat treatment process
Effect, partial pore is expanded as effective hole (aperture is 1.7～50nm), on the other hand, is also beneficial to remain in charcoal
In the oxidation of non-carbonization organic matter fractions.
2) the application stirs expanding treatment one using active oxidation aluminium ball together with the solidss after mixed gas heat treatment
The section time, oxidized non-carbonization organic matter in charcoal can be transferred in active oxidation aluminium ball, thus improve charcoal producing
Effective pore specific surface area of product.
3), in the application, the active oxidation aluminium ball for room temperature expanding treatment can be reused after high temperature sintering, cost
Low, high recycling rate.
4) table is compared using effective hole (aperture is 1.7～50nm) that technical solution of the present invention is remarkably improved charcoal product
Area and ratio, under optimum condition, effective pore specific surface area can improve 3.7～5.0 times, effective boring ratio rate can bring up to 30% with
On.
Brief description
Fig. 1 is the removal curve (25 DEG C) to herbicide tribenuron-methyl for several charcoal samples.
Specific embodiment
Comparative example：The charcoal prepared in a usual manner
Weighing 30g wood flour is biomass material, puts in box pyrolysis oven, is passed through nitrogen, protects after being heated to 600 DEG C
Warm 6h, gained pyrolysis product is taken out, and after drying, obtains 7.95g charcoal, sample number into spectrum is after washing at 105 DEG C
0#.
Following embodiment, using charcoal prepared by comparative example as process object, carries out mixed gas group used by heat treatment
Become and flow, heat treatment condition, the contrast experiment of active oxidation aluminium ball expanding treatment.
Embodiment 1-7：The impact to the effective pore specific surface area of charcoal for different mixed gas compositions during heat treatment
Take the 6g charcoal of preparation in comparative example, put into (boiler tube model Φ 8cm × 100cm, boiler tube volume in tube furnace
For 5L), nitrogen and air gas mixture are passed through with the flow of 25L per hour, after being heated to 400 DEG C, are incubated 1h, heat treatment
Gained solidss are put in 150mL water together with 12g active oxidation aluminium ball (particle diameter is 1～3mm), after stirring 24h under room temperature, take
Go out active oxidation aluminium ball, leach solidss, washing, obtain refined charcoal finished product, using specific surface after drying at 105 DEG C
The long-pending specific surface area with Porosimetry test sample and pore structure.With reference to general method of testing in industry, with N2For absorption
Matter, records isotherm adsorption data accorded under 77K, calculates the full specific surface area of sample using BET method, using BJH method calculating sample
Effectively hole (1.7～50nm) specific surface area, calculates having of sample according to the percentage ratio that effective pore specific surface area accounts for full specific surface area
Effect boring ratio rate, referring specifically to shown in table 1.
Effective boring ratio rate of table 1 prepared charcoal finished product during heat treatment in the mixed gas of different volumes ratio
According to the result in table 1, when other treatment conditions are identical, with the carrying of air proportion in mixed gas
Height, the ratio that effective pore specific surface area of refined biological charcoal product accounts for full specific surface area gradually steps up.Illustrate contained by the air
Oxygen creates ablation effect to the micro-pore wall in charcoal, make partial pore expand as effective hole that aperture is 1.7～50nm.
Volume ratio >=1 in nitrogen and air:When 1, full the specific surface area of refined biological charcoal product and effective pore specific surface area are with air
The increase of proportion and improve.But, continue to increase volume ratio shared by air, the full specific surface area of refined biological charcoal product
With effective pore specific surface area with will progressively decline.Illustrate that the air content in mixed gas is too high, charcoal product will be caused
Pore structure is caved in, that is, so-called excessive ablation occurs, is unfavorable for the raising of charcoal specific surface area.
According to data in table 1, when the volume ratio of nitrogen and air is 5:1-1:When 5, the having of gained refined biological charcoal product
Effect pore specific surface area can reach 80m2/g.Further preferably, when the volume ratio of nitrogen and air is 2:1-1:When 2, gained refines
The full specific surface area of charcoal product can reach 300m2/ more than g, effective pore specific surface area can reach 100m2/ more than g, effective hole
Ratio is more than 35%.
Embodiment 8-13：The impact to the effective pore specific surface area of charcoal for the flow of mixed gas
Take the 6g charcoal of preparation in comparative example, put into (boiler tube model Φ 8cm × 100cm, boiler tube volume in tube furnace
For 5L), being passed through volume ratio is 1:1 nitrogen and air gas mixture, are incubated 1h after being heated to 400 DEG C, heat treatment gained is solid
Body thing is put in 150mL water together with 12g active oxidation aluminium ball (particle diameter is 1～3mm), after stirring 24h under room temperature, takes out activity
Alumina balls, leach solidss, washing, obtain refined charcoal finished product, using in embodiment 1-7 after drying at 105 DEG C
Methods described analyzes full specific surface area, effective pore specific surface area and effective boring ratio rate of sample, referring specifically to shown in table 2.
Effective boring ratio rate of prepared charcoal finished product under the different mixed gas flow of table 2
According to the result in table 2, when other treatment conditions are identical, the flow with mixed gas improves, refined biological
The ratio that effective pore specific surface area of charcoal product accounts for full specific surface area gradually steps up.Illustrate that mixed gas flow improves to be conducive to changing
Enter the oxygen situation of the contact with the charcoal surface of solids in mixed gas, improve the ablation effect of oxygen.In conjunction with the embodiment in table 2
4th, 8 and 9 as can be seen that when mixed gas flow is relatively low (3-5 boiler tube volume per hour), increase with gas flow
Plus, the full specific surface area of refined biological charcoal product and effective pore specific surface area all increase.But, continue to improve mixed gas
Flow, full the specific surface area of refined biological charcoal product and effective pore specific surface area will be with will progressively decline.The stream of mixed gas is described
Amount is too high, the pore structure causing charcoal product is caved in, that is, so-called excessive ablation occurs, is unfavorable for charcoal specific surface area
Raising.
According to data in table 2, when the flow of mixed gas is 4-7 boiler tube volume per hour, gained refined biological charcoal
The full specific surface area of product can reach 300m2/ more than g, effective pore specific surface area can reach 100m2/ more than g, effective boring ratio rate exist
More than 30%.
Embodiment 14-21：The impact to the effective pore specific surface area of charcoal for the heat treatment condition
According to the result in Tables 1 and 2, on the basis of preferred mixed gas composition and flow, investigate other heat treatments
The impact to the effective pore specific surface area of charcoal for the condition (temperature, time).Take the 6g charcoal of preparation in comparative example, put into tubular type
In stove (boiler tube model Φ 8cm × 100cm, boiler tube volume is 5L), volume ratio is passed through for 1 with the flow of 25L per hour:1 nitrogen
Gas and air gas mixture, carry out heat treatment for a period of time after, gained solidss and 12g active oxidation aluminium ball (particle diameter is 1～
3mm) put into together in 150mL water, after stirring 24h under room temperature, take out active oxidation aluminium ball, leach solidss, washing, 105
Obtain refined charcoal finished product after drying at DEG C, analyze the full specific surface area of sample, have using method described in embodiment 1-7
Effect pore specific surface area and effective boring ratio rate, referring specifically to shown in table 3.
Effective boring ratio rate of prepared charcoal finished product under table 3 Different Heat Treatment Conditions
According to the result in table 3, with respect to the charcoal sample (embodiment 4) obtaining under 400 DEG C of heat treatment temperatures, continue
Raise heat treatment temperature to 500 DEG C (embodiments 14), the specific surface area of charcoal product not to be significantly improved.In conjunction with reality
Apply in example 4,15 and 16 as a result, it is possible to find out at 400 DEG C after by holding time to 2h, the ratio of refined biological charcoal product
Surface area and effective boring ratio rate all increase, but are to continue with extending to the effect of 3h inconspicuous.Illustrate that proper extension is incubated
Time is conducive to strengthening the ablation effect to charcoal micro-pore wall for the oxygen, but overlong time has no and is significantly improved effect.Implement
In example 18,19 and 20 as a result, it is possible to find out that at 300 DEG C proper extension temperature retention time is conducive to improving effective hole of charcoal
Ratio, but time renew long DeGrain follow-up more than 6h.Result explanation in embodiment 21, heat treatment temperature is as little as
When 200 DEG C, oxygen declines to the ablation effect is significant of charcoal micro-pore wall.
According to data in table 3, when heat treatment temperature at 300-400 DEG C, heat treatment time in 1-6h when, gained refined raw
The full specific surface area of thing charcoal product can reach 300m2/ more than g, effective pore specific surface area can reach 100m2/ more than g, effective boring ratio
Rate is more than 30%.
Embodiment 22-27：The impact to the effective pore specific surface area of charcoal for the different activities alumina balls addition
Take the 6g charcoal of preparation in comparative example, put into (boiler tube model Φ 8cm × 100cm, boiler tube volume in tube furnace
For 5L), volume ratio is passed through for 1 with the flow of 30L/h:2 nitrogen and air gas mixture, are incubated 6h after being heated to 300 DEG C,
Gained solidss are put in 200mL water together with active oxidation aluminium ball (particle diameter is 1～3mm), after stirring 48h under room temperature, take out
Active oxidation aluminium ball, leaches solidss, washing, obtains refined charcoal finished product, using embodiment 1- after drying at 105 DEG C
Method described in 7 analyzes full specific surface area, effective pore specific surface area and effective boring ratio rate of sample, referring specifically to shown in table 4.
Effective boring ratio rate of prepared charcoal finished product under table 4 different activities alumina balls addition
According to the result in table 4, in the case of other treatment conditions identicals, without active oxidation aluminium ball expanding treatment
Charcoal product specific surface area and effective boring ratio rate are all relatively low.After adding active oxidation aluminium ball expanding treatment, gained charcoal produces
The full specific surface area of product, effective pore specific surface area and effective boring ratio rate all significantly improve.Illustrate that active oxidation aluminium ball contributes to turning
Move oxidized part non-carbonization organic matter in charcoal, and then play the effect expanding charcoal aperture.22- in conjunction with the embodiments
26 can be seen that the raising with active oxidation aluminium ball addition, and the full specific surface area of charcoal and effective pore specific surface area are equal
It is gradually increased.But, when the mass ratio of active oxidation aluminium ball and charcoal is more than 3:After 1, the specific surface area of charcoal improves effect
Really inconspicuous.
According to data in table 4, when the mass ratio of active oxidation aluminium ball and charcoal is 5:1-1:When 1, gained refined biological
The full specific surface area of charcoal product can reach 300m2/ more than g, effective pore specific surface area can reach 100m2/ more than g, effective boring ratio rate
More than 35%.
Test cases
Take the charcoal sample of preparation in above-mentioned comparative example and embodiment 4,17,24 on a small quantity, number respectively be 0#, 1#, 2#,
3#, using the specific surface area of specific surface area and Porosimetry test sample.With reference to general method of testing in industry, with N2For
Adsorbate, records isotherm adsorption data accorded under 77K, calculates the full specific surface area of sample using BET method, using BJH method calculating sample
Effective hole (1.7～50nm) specific surface area of product, calculates sample according to the percentage ratio that effective pore specific surface area accounts for full specific surface area
Effective boring ratio rate, result is listed in table 5.
Table 5 comparative example and the specific surface area size of embodiment gained charcoal sample
Can be drawn according to the result in table 5, compared with the charcoal sample 0# in comparative example, using the technology of the present invention
Effective pore specific surface area of charcoal product 1#, 2#, 3# after scheme process improves 3.7～5.0 times, and effective boring ratio rate all carries
Height, to more than 35%, illustrates that effective pore specific surface area of the charcoal product after technical scheme process of the present invention is significantly higher than
Untreated raw material charcoal.
Absorption embodiment
Using 0.02mol/L sodium chloride solution as background, prepare initial mass concentration C0For 10,20,30,40,50mg/
The herbicide tribenuron-methyl aqueous solution of L.Measure 100mL to move in conical flask with cover, be separately added into the above-mentioned comparative example of 100mg and enforcement
In example, 0#, 1#, 2#, 3# charcoal sample of preparation, shakes up.Then conical flask is put in 25 DEG C of constant temperature oscillators, continuously shake
After swinging 48h, the residual mass concentration of herbicide in sample analysis aqueous solution, the initial mass concentration according to herbicide aqueous solution and
Residual mass concentration difference, calculates the clearance after herbicide is adsorbed by charcoal.With initial mass concentration as abscissa, clearance
For vertical coordinate, draw the removal curve (Fig. 1) to herbicide for the charcoal sample.
It will be seen from figure 1 that under identical initial concentration, 1#, 2#, 3# using the preparation of the application post-processing approach are biological
Charcoal,, in tribenuron-methyl aqueous solution initial concentration≤20mg/L, clearance almost can reach 100% for it, and under same concentrations, without
The charcoal of the application method post processing only 65% and 35%；Subsequently raise with tribenuron-methyl initial concentration, in embodiment
Under charcoal dosage, the clearance of tribenuron-methyl is declined.But 1#, 2#, 3# using technical solution of the present invention preparation are biological
Charcoal sample is still significantly higher than the 0# charcoal sample in comparative example to the clearance of tribenuron-methyl.Illustrated by Fig. 1, using this
Inventive technique scheme carries out post processing to charcoal, can significantly improve the Adsorption to organic pollutions such as pesticide for the charcoal
Efficiency.
Claims (7)
1. a kind of improve the effective pore specific surface area of charcoal post-processing approach it is characterised in that：Raw material charcoal is put into heat
In treatment furnace, it is passed through nitrogen and air gas mixture, after heat treatment, gained solidss are put into water together with active oxidation aluminium ball
In, after room temperature UR is processed, take out active oxidation aluminium ball, leach solidss, washing, obtain finished product after drying.
2. as claimed in claim 1 a kind of improve the effective pore specific surface area of charcoal post-processing approach it is characterised in that：Institute
It is 5 that the mixed gas stated consist of nitrogen with the volume ratio of air:1~1:5, flow 3 ~ 10 boiler tubes per hour of mixed gas
Volume, heat treatment temperature is 200 ~ 500 DEG C, and temperature retention time is 0.5 ~ 6 h.
3. a kind of post-processing approach improving the effective pore specific surface area of charcoal as claimed in claim 1 or 2, its feature exists
In：Described nitrogen is 2 with the volume ratio of air:1~1:2, the flow of mixed gas is 4 ~ 7 boiler tube volumes per hour, at heat
Reason temperature is 300 ~ 400 DEG C, and temperature retention time is 1 ~ 3 h.
4. as claimed in claim 1 a kind of improve the effective pore specific surface area of charcoal post-processing approach it is characterised in that：Institute
Active oxidation aluminium ball is 5 with the mass ratio of solidss:1~1:1, water is 30 with the mass ratio of active oxidation aluminium ball:1~5:1.
5. the post-processing approach of the effective pore specific surface area of a kind of raising charcoal as described in claim 1 or 4, its feature exists
In：Described active oxidation aluminium ball is 3 with the mass ratio of solidss:1~1:1.
6. as claimed in claim 1 a kind of improve the effective pore specific surface area of charcoal post-processing approach it is characterised in that：Institute
Stating solidss and expanding treatment time in water for the active oxidation aluminium ball under room temperature is 2 ~ 72 h.
7. as claimed in claim 1 a kind of improve the effective pore specific surface area of charcoal post-processing approach it is characterised in that：Institute
State raw material charcoal be with rich cellulose, lignin biomass as raw material, the high carbonaceous solids through limit oxygen pyrolysis preparation are produced
Thing.
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| CN111847419A (en) * | 2020-07-01 | 2020-10-30 | 徐州工程学院 | Device and method for rapidly expanding biochar based on low-temperature freezing |
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| CN1669919A (en) * | 2005-02-28 | 2005-09-21 | 昆明理工大学 | Method for producing mesopore activated carbon |
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| CN102442665A (en) * | 2011-09-28 | 2012-05-09 | 福州大学 | Thermally treated active carbon and preparation method thereof |
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