CN110732315A - Activated carbon adsorption material, preparation method thereof and application thereof in field of catalytic decomposition of organic pollutants - Google Patents

Activated carbon adsorption material, preparation method thereof and application thereof in field of catalytic decomposition of organic pollutants Download PDF

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CN110732315A
CN110732315A CN201911096163.3A CN201911096163A CN110732315A CN 110732315 A CN110732315 A CN 110732315A CN 201911096163 A CN201911096163 A CN 201911096163A CN 110732315 A CN110732315 A CN 110732315A
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activated carbon
starch
formaldehyde
grinding
preparation
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CN110732315B (en
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赵艳星
赵伟
张焜勇
王东元
朱凌君
赵连芳
王金威
卫田青
裴毅飞
苏思勐
梁靖
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BEIJING AEROSPACE ARES EQUIPMENT INSTALLATION CO LTD
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Abstract

The invention provides active carbon adsorption materials, a preparation method thereof and application thereof in the field of catalytic decomposition of organic pollutants.

Description

Activated carbon adsorption material, preparation method thereof and application thereof in field of catalytic decomposition of organic pollutants
Technical Field
The invention relates to the field of air purification, in particular to activated carbon adsorption materials, a preparation method thereof and application thereof in the field of catalytic decomposition of organic pollutants.
Background
The formaldehyde is which is a main pollutant in indoor air, has colorless and strong pungent smell, has the characteristics of general pollution, long pollution time and the like.
The surface chemical property of the activated carbon is mainly changed by , so that the surface chemical property of the activated carbon is changed to achieve the improvement of the adsorption capacity of the activated carbon.
Disclosure of Invention
The invention mainly aims to provide activated carbon adsorption materials, a preparation method thereof and application thereof in the field of catalytic decomposition of organic pollutants, so as to solve the problems of poor adsorption performance and poor formaldehyde catalytic decomposition efficiency of the existing activated carbon catalyst.
In order to achieve the above objects, according to aspects of the present invention, there are provided methods for preparing an activated carbon adsorbent material, the method comprising subjecting copper manganate and starch to grinding process to obtain modified starch, and mixing the modified starch and activated carbon to perform a second grinding process to obtain the activated carbon adsorbent material.
, the weight ratio of copper manganate to starch is 1 (0.01-0.1), and the particle size of copper manganate is 10-50 μm.
, the rotation speed of the grinding device adopted in the grinding process is 30-90 r/min, the grinding time is 30-60 min, and preferably, the grinding device is selected from a horizontal ball mill or a planetary high-energy ball mill.
, the weight ratio of the modified starch to the active carbon is 1 (10-40).
, the rotation speed of the grinding device used in the second grinding process is 60-120 r/min, and the grinding time is 30-60 min.
, before the second grinding process, the method further comprises removing impurities from the activated carbon.
, the impurity removing step includes vacuum drying of the activated carbon.
, in the impurity removing step, the temperature of vacuum drying is 250-350 ℃, and the drying time is 60-120 min.
In addition, aspects of the application also provide activated carbon adsorption materials, and the activated carbon adsorption materials are prepared by the preparation method.
The application also provides an aspect of the application, which provides an application of activated carbon adsorption materials in the field of catalytic decomposition of organic pollutants.
According to the technical scheme, copper manganate is catalysts capable of promoting decomposition of organic pollutants (such as formaldehyde), a large number of Mn-O bonds are formed on the surface of copper manganate powder, a large number of O-H bonds are formed on the surface of starch molecules, and the O-H bonds in starch are easy to react with each other and dehydrate, through a grinding process, the particle sizes of the copper manganate and the starch can be reduced in , and meanwhile, the copper manganate and the starch can be in full contact, in addition, the Mn-O bonds on the surface of the copper manganate and the O-H bonds on the surface of the starch form hydrogen bonds, in , after the starch is dehydrated, the starch can be subjected to steps of complexing with the Mn-O bonds, so that the starch is grafted to the surface of the copper manganate to form modified starch, in a second grinding process, the O-H bonds which do not participate in hydrogen bond bonding of the copper manganate in the starch molecules on the surface of the manganate are dehydrated to form chemical bonds with a large number of hydroxyl groups, carbonyl groups and carboxyl groups which exist on the surface of the activated carbon, so that the copper manganate is prepared, the activated carbon adsorption material has better catalytic and the copper adsorption performance of the copper is better in contact with formaldehyde, and the manganic adsorption material is better in favor of the copper manganate.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
In order to solve the technical problems, the application provides a preparation method of active carbon adsorption materials, and the preparation method comprises the steps of grinding copper manganate and starch to obtain a starch modified product, mixing the starch modified product with active carbon, and carrying out a second grinding process to obtain the active carbon adsorption material.
Copper manganate is catalyst capable of promoting decomposition of organic pollutant (such as formaldehyde), and the surface of copper manganate powder has lots of Mn-O bonds, and the surface of starch molecule has lots of O-H bonds, and the O-H bonds in the starch are easy to react with each other and dehydrate, through grinding process , the particle size of copper manganate and starch can be reduced, at the same time, they can be fully contacted, and at , the Mn-O bonds on the surface of copper manganate and the O-H bonds on the surface of starch form hydrogen bonds, and at , after dehydration of starch, the step can be proceeded to complex with Mn-O bonds, and further make starch graft to the surface of copper manganate to form modified starch, and in second grinding process, the O-H bonds in starch molecule on the surface of copper manganate, which are not involved in hydrogen bond bonding with lots of hydroxyl, carbonyl and carboxyl groups on the surface of active carbon can be dehydrated to form chemical bonds for forming active carbon adsorption material for catalytic decomposition of organic pollutant.
preferred embodiments, the weight ratio of copper manganate to starch is 1 (0.01-0.1), the weight ratio of copper manganate to starch includes but is not limited to the above range, and the limitation of the weight ratio is favorable for further to improve the grafting rate of starch on the surface of copper manganate, and further favorable for improving the performance of the activated carbon adsorption material in the aspect of catalyzing and decomposing formaldehyde.
Preferably, the granularity of the copper manganate is 10-50 microns, and the adoption of the copper manganate with the granularity range is beneficial to improving the bonding force of the starch and the copper manganate in step , so that the stability of the starch modified copper manganate, the catalytic activity of a subsequent activated carbon adsorption material and the service life are improved.
In order to further reduce the particle size of the starch modified copper manganite and further improve the adsorption performance of the subsequent activated carbon adsorption material, preferably, the rotation speed of a grinding device adopted in the grinding process is 30-90 r/min, and the grinding time is 30-60 min.
The above-mentioned grinding process may be carried out by a grinding apparatus commonly used in the art. Preferably, the milling apparatus is selected from the group consisting of a horizontal ball mill or a planetary high energy ball mill (e.g., Texas German instruments and Equipment Co., Ltd., four can laboratory planetary high energy ball mill, equipment type: DECO-PBM-V-0.4L).
In preferred embodiments, the weight ratio of the modified starch to the activated carbon is 1 (10-40). The weight ratio of the modified starch to the activated carbon includes, but is not limited to, the above range, and the limitation of the weight ratio to the activated carbon is beneficial to further increase the performance of the activated carbon adsorption material in catalyzing and decomposing formaldehyde.
In order to further improve the adsorption performance of the activated carbon adsorption material, the rotation speed of the grinding device adopted in the second grinding process is 60-120 r/min, and the grinding time is 30-60 min.
In order to improve the adsorption performance of the activated carbon adsorption material prepared by the method, the preparation method preferably comprises the step of removing impurities from the activated carbon before the second grinding process.
The impurity removal treatment process can adopt an impurity removal method commonly used in the field, and in preferred embodiments, the impurity removal treatment step comprises vacuum drying of the activated carbon, the vacuum drying process can peel off impurities such as dust on the surface of the activated carbon from the surface of the activated carbon, particularly solid particles adsorbed in holes inside the activated carbon are pumped away to a certain extent in degrees, a good hole expanding effect is achieved, the adsorption capacity of the subsequent activated carbon is increased, in order to further , the adsorption performance of the activated carbon adsorption material is improved, more preferably, in the impurity removal step, the vacuum drying temperature is 250-350 ℃, and the drying time is 60-120 min.
In addition, aspects of the application also provide activated carbon adsorption materials, and the activated carbon adsorption materials are prepared by the preparation method.
The copper manganate is a catalyst capable of promoting formaldehyde decomposition, a large number of Mn-O bonds are formed on the surface of copper manganate powder, a large number of O-H bonds are formed on the surface of starch molecules, and the O-H bonds in the starch are easy to react with each other for dehydration, through a grinding process, the particle sizes of the copper manganate and the starch can be reduced on the side, and the copper manganate and the starch can be fully contacted, in addition, on the side, the Mn-O bonds on the surface of the copper manganate and the O-H bonds on the surface of the starch form hydrogen bonds, and the starch can be subjected to complexation with the Mn-O bonds after dehydration in a grinding process in a step, so that the starch is grafted to the surface of the copper manganate to form modified starch.
The application also provides an application of activated carbon adsorption materials in the field of catalytic decomposition of organic pollutants in the aspect of .
The active carbon adsorption material has good adsorption performance and performance of catalyzing and decomposing organic pollutants, so when the active carbon adsorption material is applied to the field of catalyzing and decomposing organic pollutants, the effect is obvious.
Such organic contaminants include, but are not limited to, formaldehyde. The above-mentioned fields of catalytic decomposition of organic pollutants include, but are not limited to, the field of air purification.
The present application is described in further detail at with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
Example 1
step, putting 1 part of copper manganate with the average particle size of 50 μm and the purity of 95% into a horizontal ball mill, using zirconia ball mill as a grinding medium, adding 0.01 part of starch with the purity of 90% at the same time, and then ball milling for 30min at the rotation speed of 30r/min, secondly, drying the activated carbon at the temperature of 250 ℃ in vacuum (the air pressure in a drying oven is 0.1 atm) for 60min, thirdly, adding 40 parts of the treated activated carbon into the mixture obtained in the step, then continuing ball milling for 30min at the rotation speed of 60r/min, so that the activated carbon and the copper manganate are fully bonded to to obtain the modified activated carbon powder with the average particle size of less than 31 μm.
The modified activated carbon and the unmodified activated carbon are respectively subjected to the following performance tests:
(1) measuring the adsorption rate of the activated carbon:
injecting 3.3mg of formaldehyde into a 3-cubic sealed air bin, detecting the concentration of the formaldehyde by using a spectrophotometer, putting 3 kg of activated carbon into a cylinder with the diameter of 20cm, passing the air in the sealed air bin through the activated carbon column by using an air pump, measuring 6 cubic meters of air by using the pump with the efficiency of 10min, taking samples every min by using the spectrophotometer to measure the concentration of the formaldehyde, measuring 20 points to calculate the reduction speed of the formaldehyde along with time, and further calculating the concentration of the formaldehyde to be lower than 0.1m g/m according to a curve3Time of (d).
The test result shows that: the formaldehyde concentration of the modified activated carbon is from 1.1mg/m after 6min and 17s3Reduced to 0.1mg/m3Hereinafter, the untreated equivalent amount of activated carbon required 47min 12s to achieve the above effects.
(2) Measuring the formaldehyde decomposition rate catalyzed by activated carbon:
injecting formaldehyde into a sealed air chamber of 3 cubes, placing 3 kg of activated carbon into a column with a diameter of 20cm, passing the air in the sealed chamber through the activated carbon column by an air pump with the efficiency of the pump being 10min and 6 cubic meters of air, measuring the formaldehyde concentration by taking samples every min by a spectrophotometer, and detecting the formaldehyde concentration by the spectrophotometerWhen the concentration is not reduced any more, the activated carbon is considered to be adsorbed and saturated, and then the concentration of the formaldehyde in the sealed bin is increased to 1.1mg/m3Then, the formaldehyde concentration was measured 24 hours later, and this change in formaldehyde concentration was considered to be a decrease in activated carbon concentration due to decomposition.
The test result shows that: the concentration of formaldehyde in the modified activated carbon is reduced by 12.4% after 24h, while the concentration of formaldehyde in an untreated equivalent amount of activated carbon is not substantially changed after 24 h.
Example 2
step, putting 1 part of copper manganate with average particle size of 10 mu m and purity of 99% into a horizontal ball mill, using zirconia ball mill as grinding medium, simultaneously adding 0.1 part of starch with purity of 99% and then ball milling for 60min at the rotation speed of 90r/min, secondly drying the activated carbon at 350 ℃ in vacuum (the air pressure in a drying oven is 0.01 atmospheric pressure) for 120min, thirdly adding 40 parts of the treated activated carbon into the mixture obtained in the step, and then continuing ball milling for 60min at the rotation speed of 120r/min to ensure that the activated carbon and the copper manganate are fully bonded to to obtain the modified activated carbon powder with the average particle size of less than 10 mu m.
The modified activated carbon and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the formaldehyde content of the modified activated carbon is 1.2mg/m after 5min at 8s3Reduced to 0.1mg/m3The same amount of untreated activated carbon took 53min27s to achieve the above effect.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the concentration of formaldehyde in the modified activated carbon is reduced by 16.9% after 24h, while the concentration of formaldehyde in an untreated equivalent amount of activated carbon is not substantially changed after 24 h.
Example 3
step, putting 1 part of copper manganate with average particle size of 20 μm and purity of 96% into a horizontal ball mill, using zirconia ball mill as grinding medium, adding 0.02 part of starch with purity of 92% and ball milling for 35min at the rotation speed of 35r/min, secondly drying the activated carbon at 280 ℃ in vacuum (the air pressure in a drying oven is 0.02 atm) for 70min, thirdly adding the treated 20 parts of activated carbon into the mixture obtained in the step, continuing ball milling for 35min at the rotation speed of 70r/min, and enabling the activated carbon and the copper manganate to be fully bonded to to obtain modified activated carbon powder with the average particle size of less than 16 μm.
The modified activated carbon and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the formaldehyde concentration of the modified activated carbon is from 1.1mg/m after 6min 2s3Reduced to 0.1mg/m3Hereinafter, the above effects were achieved only in 49min 38s for an equivalent amount of activated carbon that had not been treated.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the concentration of formaldehyde in the modified activated carbon after 24h is reduced by 12.3%, while the concentration of formaldehyde in an untreated equivalent amount of activated carbon after 24h is basically unchanged.
Example 4
step, putting 1 part of copper manganate with average particle size of 30 μm and purity of 97% into a horizontal ball mill, using zirconia ball mill as grinding medium, adding 0.03 part of starch with purity of 93% and ball milling for 40min at the rotation speed of 40r/min, secondly, drying the activated carbon at 290 ℃ in vacuum (the air pressure in a drying oven is 0.03 atm) for 75min, thirdly, adding the treated 30 parts of activated carbon into the mixture obtained in the step, continuing ball milling for 40min at the rotation speed of 75r/min, and enabling the activated carbon and the copper manganate to be fully bonded to to obtain modified activated carbon powder with average particle size of less than 20 μm.
The modified activated carbon and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the formaldehyde concentration of the modified activated carbon is from 1.2mg/m after 5min and 48s3Reduced to 0.1mg/m3Hereinafter, the above-mentioned effects were achieved only in 51min 22s for an equivalent amount of activated carbon which had not been treated.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the formaldehyde concentration of the modified activated carbon after 24h is reduced by 14.1 percent, and the formaldehyde concentration of the untreated equivalent activated carbon after 24h is basically unchanged.
Example 5
step, putting 1 part of copper manganate with average particle size of 35 μm and purity of 98% into a horizontal ball mill, using zirconia ball mill as grinding medium, adding 0.05 part of starch with purity of 96% and ball milling for 45min at the rotation speed of 60r/min, secondly drying the activated carbon at 310 ℃ in vacuum (the air pressure in a drying oven is 0.06 atm) for 90min, thirdly adding 30 parts of the treated activated carbon into the mixture obtained in the step, continuing ball milling for 45min at the rotation speed of 90r/min, and enabling the activated carbon and the copper manganate to be fully bonded to to obtain modified activated carbon powder with the average particle size of less than 22 μm.
The modified activated carbon and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the formaldehyde concentration of the modified activated carbon is from 1.1mg/m after 5min and 19s3Reduced to 0.1mg/m3The above effect was achieved only after 48min 09s for an untreated equivalent amount of activated carbon.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the concentration of formaldehyde in the modified activated carbon after 24h is reduced by 15.1%, while the concentration of formaldehyde in an untreated equivalent amount of activated carbon after 24h is basically unchanged.
Example 6
step, putting 1 part of copper manganate with average particle size of 45 μm and purity of 97% into a horizontal ball mill, using zirconia ball mill as grinding medium, adding 0.07 part of starch with purity of 91% and ball milling for 50min at the rotation speed of 80r/min, secondly drying the activated carbon at the temperature of 330 ℃ in vacuum (the air pressure in a drying oven is 0.09 atm) for 100min, thirdly adding 33 parts of the treated activated carbon into the mixture obtained in the step, continuing ball milling for 50min at the rotation speed of 100r/min, and enabling the activated carbon and the copper manganate to be fully bonded to to obtain modified activated carbon powder with the average particle size of less than 28 μm.
The modified activated carbon and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the formaldehyde concentration of the modified activated carbon is from 1.1mg/m after 5min and 22s3Reduced to 0.1mg/m3Hereinafter, the above effects were achieved only at 47min 59s when an equal amount of activated carbon was used without treatment.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the concentration of formaldehyde in the modified activated carbon after 24h is reduced by 15.5%, while the concentration of formaldehyde in an untreated equivalent amount of activated carbon after 24h is basically unchanged.
Example 7
step, putting 1 part of copper manganate with the average particle size of 50 μm and the purity of 95% into a horizontal ball mill, using zirconia ball mill as a grinding medium, adding 0.2 part of starch with the purity of 90% at the same time, and then ball milling for 30min at the rotation speed of 30r/min, secondly, drying the activated carbon at the temperature of 250 ℃ in vacuum (the air pressure in a drying oven is 0.1 atm) for 60min, thirdly, adding 40 parts of the treated activated carbon into the mixture obtained in the step, then continuing ball milling for 30min at the rotation speed of 60r/min, so that the activated carbon and the copper manganate are fully bonded to to obtain the modified activated carbon powder with the average particle size of less than 30 μm.
The modified activated carbon and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the formaldehyde concentration of the modified activated carbon is from 1.1mg/m after 19min and 17s3Reduced to 0.1mg/m3As compared with example 1, it can be seen that the particle size is almost , but the formaldehyde adsorption efficiency is significantly reduced, mainly because the increase of the starch content causes many activated carbon pores to be blocked by starch, so that the formaldehyde adsorption efficiency is reduced.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the concentration of formaldehyde in the modified activated carbon after 24h is reduced by 3.9%, while the concentration of formaldehyde in the untreated equivalent activated carbon after 24h is basically unchanged. The rate of formaldehyde decomposition is also significantly reduced relative to example 1, since the starch may also coat the copper manganate surface, which results in a significant reduction in the chance of formaldehyde contacting the copper manganate surface, and a significant reduction in the efficiency of catalytic decomposition.
Example 8
step, putting 1 part of copper manganate with average particle size of 50 μm and purity of 95% into a horizontal ball mill, using zirconia ball mill as grinding medium, adding 0.01 part of starch with purity of 90% and then ball milling for 10 (or 80) min at the rotation speed of 20 (or 120) r/min, secondly drying the activated carbon at 250 ℃ in vacuum (the air pressure in a drying oven is 0.1 atm) for 60min, and thirdly adding 40 parts of the treated activated carbon into the mixture obtained in step , then continuing ball milling for 30min at the rotation speed of 60r/min, so that the activated carbon and the copper manganate are fully bonded to , and finally obtaining the modified activated carbon powder with average particle size of less than 31 μm.
The modified activated carbon and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the concentration of the modified activated carbon is from 1.1mg/m at 15min and 19s (or 12min and 58s)3Reduced to 0.1mg/m3The equivalent amount of activated carbon that had not been treated was 46min 44s (49min01s) below.
Compared with the example 1, the formaldehyde adsorption rate is obviously reduced when the treatment time is less than 30min, because the short treatment time causes insufficient mixing between the copper manganite and the starch, good bonding is not formed, and the copper manganite and the starch cannot be uniformly mixed and bonded with the activated carbon in the subsequent mixing process with the activated carbon, the final adsorption efficiency is influenced, the ball milling time is long, the fragile bonding formed between the starch and the copper manganite is damaged to a certain extent, and the final bonding effect with the activated carbon is influenced
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the formaldehyde concentration of the modified activated carbon after 24h is reduced by 3.3 percent (4.1 percent), and the formaldehyde concentration of the untreated equivalent activated carbon after 24h is basically unchanged. Also after the adsorption efficiency becomes weak, the catalytic decomposition ability becomes remarkably weak.
Example 9
step, putting 1 part of copper manganate with the average particle size of 50 mu m and the purity of 95 percent into a horizontal ball mill, using zirconia grinding balls as grinding media, adding 0.01 part of starch with the purity of 90 percent at the same time, then carrying out ball milling for 30min at the rotating speed of 30r/min, secondly drying the activated carbon at the temperature of 250 ℃ in vacuum (the air pressure in a drying box is 0.1 atmospheric pressure) for 60min, thirdly adding 40 parts of the treated activated carbon into the mixture obtained in the step, and then continuing ball milling for 30min, 60r/min and 60min, 120r/min to ensure that the activated carbon and the copper manganate are fully bonded to , and finally obtaining the modified activated carbon powder with the average particle size of less than 31 mu m.
(1) The results of measuring the adsorption rate of activated carbon show that: the concentration of the modified activated carbon 26min01s (21min 37s) is from 1.1mg/m3Reduced to 0.1mg/m3Hereinafter, the equivalent amount of activated carbon which had not been treated was 47min 12 s. When the rotating speed is lower than 60r/min, the crushing capacity is remarkably reduced, larger particles of the activated carbon cannot be thinned, the larger particles have lower specific surface area, the lower the adsorption efficiency is, and when the rotating speed exceeds 120r/min, the activated carbon is completely crushed, so that the original holes of the activated carbon are all damaged, the adsorption efficiency is reduced
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the concentration of formaldehyde in the modified activated carbon after 24h is reduced by 12.4%, while the concentration of formaldehyde in an untreated equivalent amount of activated carbon after 24h is basically unchanged. Also after the adsorption efficiency becomes weak, the catalytic decomposition ability becomes remarkably weak.
Example 10
step, putting 1 part of copper manganate with average particle size of 50 μm and purity of 95% into a horizontal ball mill, using zirconia ball mill as grinding medium, adding 0.001 (or 0.5) part of starch with purity of 90% and ball milling for 30min at the rotation speed of 30r/min, secondly drying the activated carbon at 250 ℃ in vacuum (the air pressure in a drying oven is 0.1 atm) for 60min, thirdly adding 40 parts of the treated activated carbon into the mixture obtained in step , continuing ball milling for 30min at the rotation speed of 60r/min, and fully bonding the activated carbon and the copper manganate to to obtain the modified activated carbon powder with average particle size of less than 31 μm.
(1) The results of measuring the adsorption rate of activated carbon show that: the concentration of the modified activated carbon for 18min and 32s (21min) is from 1.1mg/m3Reduced to 0.1mg/m3Hereinafter, the equivalent amount of activated carbon which had not been treated was 47min 12 s.
(2) The result of measuring the formaldehyde catalytic decomposition rate of the activated carbon shows that the formaldehyde concentration of the modified activated carbon is reduced by 2.7 percent (3.9 percent) after 24 hours, while the formaldehyde concentration of the untreated activated carbon is basically unchanged after 24 hours.
Example 11
, putting 1 part of copper manganate with the average particle size of 50 mu m and the purity of 95 percent into a horizontal ball mill, using zirconia grinding balls as grinding media, simultaneously adding 0.01 part of starch with the purity of 90 percent, and then carrying out ball milling for 30min at the rotating speed of 30r/min, adding 40 parts of treated activated carbon into the mixture obtained in the , then continuing ball milling for 30min at the rotating speed of 60r/min, and fully bonding the activated carbon and the copper manganate to to obtain the modified activated carbon powder with the average particle size of less than 31 mu m.
(1) The results of measuring the adsorption rate of activated carbon show that: the concentration of the modified activated carbon for 36min 09s is from 1.1mg/m3Reduced to 0.1mg/m3Hereinafter, the equivalent amount of activated carbon which had not been treated was 47min 12 s.
The reason is that the activated carbon has very high adsorption performance, so that -degree water vapor can be adsorbed on the surface of the activated carbon, and during the ball milling process with starch, the starch is very easy to adsorb water on the activated carbon and cannot be dehydrated to form hydrogen bond and other bonds with the surface of the activated carbon.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the concentration of formaldehyde in the modified activated carbon after 24h is reduced by 1.6%, while the concentration of formaldehyde in an untreated equivalent amount of activated carbon after 24h is basically unchanged.
Comparative example 1
The differences from example 1 are: the copper manganate was mixed directly with the starch without milling.
step, 1 part of copper manganate with average particle size of 50 μm and purity of 95% is put into a horizontal ball mill, 0.01 part of starch with purity of 90% is added, the ball mill rotates for 30min at the speed of 30r/min, which is just simple mixing without grinding process, and the third step is that 40 parts of activated carbon is added into the mixture of step, then simple mixing is continued for 30min at the speed of 60r/min, so that the activated carbon and the copper manganate are mixed to , and finally powder mixture is obtained.
The above powder mixture and unmodified activated carbon were each subjected to the following performance tests:
(1) measurement of adsorption rate:
the test result shows that: the formaldehyde concentration of the powder mixture after 46min 51s was from 1.1mg/m3Reduced to 0.1mg/m3Hereinafter, the untreated equivalent amount of activated carbon required 47min 12s to achieve the above effect, and the adsorption properties of both were almost completely equivalent, that is, no improvement in the adsorption properties was obtained by simple mixing without grinding and drying processes.
(2) Measurement of catalytic decomposition rate:
the test result shows that: the formaldehyde concentration after 24h was essentially unchanged for the simply mixed powder mixture without grinding and drying processes and for an untreated equivalent of activated carbon.
The grinding action has two effects: 1. so that the copper manganate and the starch are uniformly mixed; 2. reducing the grain size of starch and copper manganate. When grinding is not carried out, the subsequent mixing of the activated carbon, the copper manganate and the starch cannot be uniformly mixed, and a good chemical bond cannot be formed, so that the final adsorption performance is very weak.
Comparative example 2
The differences from example 1 are: the modified starch was directly mixed with activated carbon without milling.
step, 0.1 part of starch with 99% purity is put into a ball mill pot, the ball mill rotates at 90r/min for 60min, which is just simple mixing without grinding process, the second step is to dry the activated carbon at 350 ℃ in vacuum (0.01 atmosphere in the drying oven) for 120min, the third step is to add 40 parts of the treated activated carbon into the mixture of step, then to continue to mix for 60min and rotate at 120r/min, so that the activated carbon and starch are mixed to , finally the powder mixture of starch and activated carbon.
The powder mixture and the unmodified activated carbon were subjected to the following performance tests, respectively, in the same manner as in example 1.
(1) The results of measuring the adsorption rate of activated carbon show that: the formaldehyde content after mixing the powder at a concentration of 88s for 52min was from 1.2mg/m3Reduced to 0.1mg/m3The above-mentioned effects were achieved only after 53min 7s of the time required for an equivalent amount of activated carbon without treatment.
(2) The result of measuring the formaldehyde decomposition rate catalyzed by the activated carbon shows that: the formaldehyde concentration was essentially unchanged after 24h for both the powder mixture and the untreated equivalent of activated carbon.
Grinding starch and activated carbon has two functions: the activated carbon particles are thinned while facilitating direct contact and bonding of the starch and the activated carbon. When grinding is not carried out, the subsequent modified starch and the activated carbon cannot be uniformly mixed, and a good chemical bond cannot be formed, so that the final adsorption performance is very weak.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the activated carbon adsorption material prepared by the method has better adsorption performance, and is more favorable for the contact of copper manganite and formaldehyde after adsorption, so that the copper manganite has better capability of catalyzing and decomposing formaldehyde.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

  1. The preparation method of active carbon adsorption materials is characterized by comprising the following steps:
    carrying out grinding process on copper manganate and starch to obtain modified starch;
    and mixing the modified starch with activated carbon to perform a second grinding process to obtain the activated carbon adsorption material.
  2. 2. The preparation method of claim 1, wherein the weight ratio of the copper manganate to the starch is 1 (0.01-0.1);
    preferably, the particle size of the copper manganate is 10-50 μm.
  3. 3. The preparation method according to claim 1 or 2, wherein the th grinding process adopts a grinding device with a rotating speed of 30-90 r/min and a grinding time of 30-60 min;
    preferably, the milling device is selected from a horizontal ball mill or a planetary high energy ball mill.
  4. 4. The method according to of claims 1-3, wherein the weight ratio of the modified starch to the activated carbon is 1 (10-40).
  5. 5. The preparation method according to claim 4, wherein the rotation speed of the grinding device used in the second grinding process is 60-120 r/min, and the grinding time is 30-60 min.
  6. 6. The method of manufacturing according to claim 1, further comprising, before performing the second grinding process: and removing impurities from the activated carbon.
  7. 7. The production method according to claim 6, wherein the impurity removal processing step includes: and carrying out vacuum drying on the activated carbon.
  8. 8. The preparation method according to claim 7, wherein in the step of removing impurities, the temperature of vacuum drying is 250-350 ℃, and the drying time is 60-120 min.
  9. 9, kinds of activated carbon adsorption material, characterized in that, the activated carbon adsorption material is prepared by the preparation method of any of claims 1 to 8.
  10. Use of the activated carbon adsorption material of claim 9 in the field of catalytic decomposition of organic pollutants.
CN201911096163.3A 2019-11-11 2019-11-11 Activated carbon adsorption material, preparation method thereof and application thereof in field of catalytic decomposition of organic pollutants Expired - Fee Related CN110732315B (en)

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CN1887391A (en) * 2006-07-25 2007-01-03 袁有登 Making process of antibiotic chess with bamboo charcoal powder and active carbon as main material
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CN1887391A (en) * 2006-07-25 2007-01-03 袁有登 Making process of antibiotic chess with bamboo charcoal powder and active carbon as main material
CN106582654A (en) * 2016-11-24 2017-04-26 山东大学 Novel carbon-based material supporting spinel catalyst and preparation method thereof
CN110385112A (en) * 2019-06-12 2019-10-29 刘培军 A kind of preparation method of high effective green environmentally friendly formaldehyde remover

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