CN110605094A - Modification method for making sanitary and safe soaking pH of activated carbon fiber water purification material reach standard - Google Patents
Modification method for making sanitary and safe soaking pH of activated carbon fiber water purification material reach standard Download PDFInfo
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- CN110605094A CN110605094A CN201810619143.9A CN201810619143A CN110605094A CN 110605094 A CN110605094 A CN 110605094A CN 201810619143 A CN201810619143 A CN 201810619143A CN 110605094 A CN110605094 A CN 110605094A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000002791 soaking Methods 0.000 title claims abstract description 33
- 238000002715 modification method Methods 0.000 title claims abstract description 30
- 238000000746 purification Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 title claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 65
- 238000005406 washing Methods 0.000 claims abstract description 23
- 239000011261 inert gas Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000004917 carbon fiber Substances 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 238000001255 X-ray photoelectron diffraction Methods 0.000 description 12
- 239000003651 drinking water Substances 0.000 description 9
- 235000020188 drinking water Nutrition 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 125000000524 functional group Chemical group 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 238000004611 spectroscopical analysis Methods 0.000 description 6
- 238000001819 mass spectrum Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- -1 felt Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 241000264877 Hippospongia communis Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012490 blank solution Substances 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
Abstract
The invention discloses a modification method for ensuring the sanitary and safe soaking pH of an activated carbon fiber water purification material to reach the standard, which comprises the following steps: washing the activated carbon fiber with water, and squeezing to dry after washing; placing the extruded active carbon fiber in a heating device capable of providing inert gas protection for roasting; and cooling the roasted material to room temperature to obtain the modified activated carbon fiber. The modified activated carbon fiber obtained by the modification method provided by the embodiment of the invention has the advantages of small influence on the pH value of a soaking solution in a sanitary and safe soaking process, high removal rate of COD (chemical oxygen demand), no impurity generation in a using process and the like.
Description
Technical Field
The invention belongs to the high-temperature heat treatment technology, relates to the technical field of activated carbon fiber water purification, and particularly relates to a high-temperature heat treatment modified activated carbon fiber which can be used for purifying drinking water. The material used in the invention is activated carbon fiber, and the surface functional group of the activated carbon fiber is changed by high-temperature heat treatment in air isolation after water washing; when the water purifier made of the modified activated carbon fibers is used for a sanitary and safe soaking test, the change of the pH value before and after soaking in a soaking solution is reduced, so that the change of the pH value of purified water in the use of the water purifier meets the requirement of sanitary water quality standards for drinking water (2001).
Background
Due to environmental pollution, water quality is seriously affected, and a large amount of artificial organic matters exist in water. If the untreated polluted water is directly drunk, the human health is seriously harmed, so the polluted water needs to be treated and then used as domestic water. In the related technology, the feed water treatment mainly adopts operation processes of coagulation, precipitation, filtration, disinfection and the like for purification. The traditional water treatment method has limited removal of organic matters in water, and simultaneously, certain residual chlorine can be stored in the water in order to prevent the breeding of microorganisms in the transportation process. With the improvement of economic development and living standard of people, the requirement of people on water quality is continuously improved, advanced water treatment process is selected, water quality treatment depth is increased, and new technology is developed to meet the requirement of the current times.
The activated carbon fiber has been widely used in the field of water purification. The activated carbon fiber has large specific surface area and rich micropores, and is easy to contact with pollutants in water, so the activated carbon fiber has high adsorption rate and is beneficial to adsorption and separation; meanwhile, the activated carbon fiber has high chlorine removal performance. The fibrous structure of the activated carbon fiber can be processed into various fabric forms such as cloth, felt, paper and the like and cylindrical honeycombs, and the activated carbon fiber is not easy to form mud-like substances even if used for a long time and has shape stability, so the activated carbon fiber has greater application potential in the field of water purification. The currently used activated carbon fiber raw materials include cellulose, phenolic aldehyde, polyacrylonitrile, pitch and the like.
However, the active carbon fiber water purification filter element and the filter cup prepared by the active carbon fiber used at present have large change of the pH value of the soak solution before and after soaking in a soaking experiment, which exceeds 0.5 unit, and can not meet the requirements of sanitary water quality standards for drinking water (2001); meanwhile, the removal rate of COD is low. Therefore, the method solves the problems of the influence of the filter element made of the activated carbon fiber on the pH value of the soak solution and the removal rate of COD by an economic and practical method, and has important significance for the application of the activated carbon fiber in the field of water purification and the deep purification of drinking water.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and particularly solves the problem that a water purifier adopting an activated carbon fiber filter element is unqualified in sanitary and safe soaking. The invention provides a modification method for ensuring the sanitary and safe soaking pH of an activated carbon fiber water purification material to reach the standard, and in short, provides a preparation method of modified activated carbon fibers, wherein the change range of the pH and the removal rate of COD before and after the sanitary and safe soaking are reduced and the removal rate of COD is increased by changing the type and the content of functional groups of the material, so as to meet the requirements of sanitary water quality standards for drinking water (2001).
The preparation method of the modified activated carbon fiber comprises the following steps:
washing the activated carbon fiber with water, and squeezing to dry after washing;
placing the extruded active carbon fiber in a heating device capable of providing inert gas protection for roasting;
and cooling the roasted material to room temperature to obtain the modified activated carbon fiber.
The modified activated carbon fiber obtained by the preparation method provided by the embodiment of the invention has the following advantages:
(1) the influence on the pH value of the soak solution is small in the sanitary and safe soaking process;
(2) the removal rate of COD is improved;
(3) no impurity is generated in the using process.
In addition, the preparation method according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the activated carbon fibers are rinsed with deionized or pure water.
Optionally, the washing time for washing the activated carbon fiber is not less than 2min, and the activated carbon fiber is squeezed to a water content of not less than 10%. Wherein, the water content calculation formula is as follows: water content (mass of activated carbon fiber after squeezing-mass of activated carbon fiber before rinsing)/mass of activated carbon fiber before rinsing.
According to some embodiments of the present invention, the firing conditions are such that after exhausting air with the flowing inert gas at a flow rate not less than a predetermined flow rate, the flowing inert gas at the predetermined flow rate is continuously maintained as a shielding gas, the temperature is raised to a predetermined temperature range at a temperature raising rate not less than a predetermined temperature raising rate, and the firing is performed for not less than a predetermined time under the condition within the predetermined temperature range. Wherein the rate of temperature rise refers to the temperature rise per minute inside the heating device.
Optionally, the predetermined flow rate is 50 ml/min.
Optionally, the predetermined temperature rise rate is 2 ℃/min.
In some embodiments of the invention, the predetermined temperature range is 700 ℃ to 1000 ℃ and the predetermined time is 2 min.
In other embodiments of the present invention, the predetermined temperature range is 800 ℃ to 850 ℃ and the predetermined time is 5 min.
Optionally, the cooling to room temperature is performed under the condition that inert gas is continuously flowed through a heating device capable of providing inert gas protection, and the modified activated carbon fiber is obtained after cooling and taking out.
Optionally, the modification method according to an embodiment of the present invention further includes the steps of:
cutting the activated carbon fibers into required sizes before washing the activated carbon fibers.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a thermogravimetric plot of a sample of activated carbon fibers, wherein the sample is as-is activated carbon fibers;
FIG. 2 is a thermogravimetric plot of a sample of activated carbon fibers, wherein the sample is a modified activated carbon fiber treated according to a modification method according to an embodiment of the present invention;
FIG. 3 is a mass spectrum of water vapor and carbon dioxide released by a sample of activated carbon fiber as the temperature increases, wherein the sample is the activated carbon fiber as it is;
FIG. 4 is a mass spectrum of water vapor and carbon dioxide released with increasing temperature from a sample of activated carbon fibers, wherein the sample is modified activated carbon fibers treated according to a modification method of an embodiment of the present invention;
FIG. 5 is a peak separation chart of C in X-ray photoelectron diffraction (XPS) of an as-received activated carbon fiber;
FIG. 6 is a peak plot of O in X-ray photoelectron diffraction (XPS) of activated carbon fibers as they are;
FIG. 7 is a peak value diagram of N in X-ray photoelectron diffraction (XPS) of an as-received activated carbon fiber;
FIG. 8 is a peak plot of C in X-ray photoelectron diffraction (XPS) of modified activated carbon fibers treated by a modification method according to an embodiment of the present invention;
FIG. 9 is a peak plot of O in X-ray photoelectron diffraction (XPS) of modified activated carbon fibers treated by a modification method according to an embodiment of the present invention;
FIG. 10 is a graph of the N peak of X-ray photoelectron diffraction (XPS) of modified activated carbon fibers treated by a modification method according to an embodiment of the present invention;
fig. 11 is a fourier-infrared spectrum of an activated carbon fiber as it is and a modified activated carbon fiber obtained by a modification method according to an embodiment of the present invention.
FIG. 12 is a flow chart of a modification method according to an embodiment of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below are exemplary embodiments for explaining the present invention with reference to the drawings and should not be construed as limiting the present invention, and those skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the principle and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
The following describes a modification method for making the sanitary and safe soaking pH of the activated carbon fiber water purification material meet the standard according to an embodiment of the invention with reference to the accompanying drawings.
According to some embodiments of the present invention, as shown in fig. 12, the modification method for reaching the hygienic and safe soaking pH of the activated carbon fiber water purification material may include the following steps:
s1: washing the activated carbon fiber with water, and squeezing to dry after washing;
s2: placing the extruded active carbon fiber in a heating device capable of providing inert gas protection for roasting;
s3: and cooling the roasted material to room temperature to obtain the modified activated carbon fiber.
The modified activated carbon fiber obtained by the modification method provided by the embodiment of the invention has the following advantages:
(1) the influence on the pH value of the soak solution is small in the sanitary and safe soaking process;
(2) the removal rate of COD (Chemical Oxygen Demand) is improved;
(3) no impurity is generated in the using process.
In some embodiments of the invention, the modified activated carbon fiber is used to prepare a filter element, and the sanitary and safe soaking test of the filter element is carried out according to the sanitary and safe water quality and sanitation Specification for drinking water (2001), and the main operation steps are as follows:
(1) preparing a soak solution with the pH value of 8, the hardness of 100mg/L and the available chlorine of 2 mg/L;
(2) washing the modified activated carbon fiber with deionized water (or tap water) for 30 min;
(3) pumping the sample obtained in the step (2) to be dry and then immediately soaking the sample in a soaking solution;
(4) and (4) placing the soaked sample obtained in the step (3) in a dark place for 24 +/-1 h, and then determining the pH value.
Alternatively, the activated carbon fibers may be rinsed with deionized or pure water. This can improve the washing effect and further reduce impurities in the activated carbon fibers.
According to some embodiments of the present invention, the washing time for washing the activated carbon fiber may be not less than 2min, and the activated carbon fiber may be squeezed to a moisture content of not less than 10%. This can improve the effect of modification.
Optionally, the roasting condition is that after the air is exhausted by the flowing inert gas with the flow rate not less than the preset flow rate, the flowing inert gas with the preset flow rate is continuously kept as the protective gas, the temperature is increased to be within the preset temperature range at the temperature increasing rate not less than the preset temperature increasing rate, and the roasting is carried out for not less than the preset time under the condition within the preset temperature range. This can further improve the effect of modification.
Wherein the predetermined flow rate, the predetermined temperature rise rate, the predetermined temperature range and the predetermined time can be set as desired. Alternatively, in some embodiments of the present invention, the predetermined flow rate may be 50ml/min, the predetermined ramp rate may be 2 ℃/min, the predetermined temperature range may be 700 ℃ to 1000 ℃, and the predetermined time is 2 min. Research shows that when the modification method adopts the numerical value meeting the value requirement, the modification effect on the activated carbon fiber is excellent.
For example, in some specific examples of the present invention, the predetermined temperature range may be 800 ℃ to 850 ℃ and the predetermined time may be 5 min.
According to some embodiments of the present invention, the cooling to room temperature is performed by cooling under the condition of continuously flowing inert gas through a heating device capable of providing inert gas protection, and the modified activated carbon fiber is obtained after cooling and taking out. . Therefore, the cooling effect is better, and the improvement of the modification effect is facilitated.
Optionally, the modification method according to the embodiment of the present invention may further include the steps of: before the activated carbon fiber is washed, the activated carbon fiber is cut into a required size.
Therefore, the modified activated carbon fiber can meet the size requirement, is more convenient to process, and can reduce the influence caused by overlarge size.
In some embodiments of the present invention, the modified activated carbon fiber is prepared by the following steps: cutting the activated carbon fiber into required size, placing the activated carbon fiber in a container, washing the container with continuous deionized water or pure water for at least 2min, removing partial ions and flame retardant in the activated carbon fiber, taking out a sample, and extruding the sample until the water content is not less than 10%. Putting the squeezed sample into a heating device capable of providing inert gas protection, exhausting air by using circulating inert gas with the flow rate of not less than 50ml/min, continuously keeping the circulating inert gas with the flow rate as protective gas, raising the temperature to 700-1000 ℃ at the temperature rise rate of not less than 2 ℃/min, and roasting at 700-1000 ℃ for not less than 2 min. Then, the mixture is cooled to room temperature by passing inert gas through a heating device capable of providing inert gas protection, and then taken out for standby.
The pH change range of the modified activated carbon fiber prepared by the method is reduced and the COD removal rate is increased before and after sanitary and safe soaking, and the modified activated carbon fiber can meet the requirements of sanitary water quality standards for drinking water (2001).
Example 1:
washing activated carbon fiber with deionized water for 5min, drying, rolling, and placing in effective heating region of tube furnace. The tube furnace is heated at a heating rate of 10 ℃/min, under the action of a protective gas flowing through the tube furnace, at a flow rate of 150ml/min to 850 ℃ (or 800 ℃), and is kept at 850 ℃ (or 800 ℃) for 5 min. Cooling to room temperature in a tube furnace, and taking out for later use.
The above heat treated samples were placed in a beaker and rinsed with deionized water for 30 min. And (2) placing the washed sample in a triangular flask with a plug, washing the sample for 3 times by using the prepared soak solution, adding the soak solution (soaking the soak solution and the activated carbon fibers according to the proportion in the sanitary Standard for Water quality of Drinking (2001)) into the triangular flask with the plug, which is not added with the activated carbon fibers, as a blank soak solution, sealing the blank soak solution with water, and placing the blank solution in a dark place for 24 +/-1 h. Then taking out the activated carbon fiber, and measuring the pH value of the soaked liquid.
Fig. 1 and 2 are thermogravimetric graphs of samples of activated carbon fibers, wherein fig. 1 is a thermogravimetric graph of an activated carbon fiber as it is (i.e., not modified by a modification method according to an embodiment of the present invention), and fig. 2 is a thermogravimetric graph of a modified activated carbon fiber (treated at 850 ℃) obtained in example 1. In fig. 1, the mass increases somewhat during the temperature increase and then decreases gradually, with the mass decreasing most rapidly at 900 ℃. In fig. 2, the modified activated carbon fiber is reduced in mass rapidly with a large amount of moisture as the temperature increases, and the mass is reduced all the time when the moisture is completely evaporated, and is reduced most rapidly around 780 ℃.
Fig. 3 and 4 are mass spectra of water vapor and carbon dioxide released from the activated carbon fiber according to the increase of temperature, wherein fig. 3 is a mass spectrum of the activated carbon fiber as it is, and fig. 4 is a mass spectrum of the modified activated carbon fiber (treated at 850 ℃) obtained in example 1.
In fig. 3, the activated carbon fiber-like water vapor starts to be released in a large amount at 100 ℃, and then the release amount gradually decreases, and when the temperature reaches 800 ℃, the water vapor release amount increases again, and the carbon dioxide release amount gradually increases with the increase in temperature, and the release amount is the largest around 800 ℃. In fig. 4, the modified activated carbon fiber released a large amount of water vapor as the temperature increased, and the release amount began to decrease around 500 ℃, and the release amount of carbon dioxide gradually increased as the temperature increased, reaching a peak at 800 ℃ and higher than the release amount of carbon dioxide at 800 ℃ as it is.
Fig. 5 to 10 are peak separation diagrams of C, O, N of the activated carbon fiber. Fig. 5 is a peak profile of C in X-ray photoelectron diffraction spectroscopy (XPS) of the activated carbon fiber as it is, fig. 6 is a peak profile of O in X-ray photoelectron diffraction spectroscopy (XPS) of the activated carbon fiber as it is, fig. 7 is a peak profile of N in X-ray photoelectron diffraction spectroscopy (XPS) of the activated carbon fiber as it is, fig. 8 is a peak profile of C in X-ray photoelectron diffraction spectroscopy (XPS) of the modified activated carbon fiber (treated at 850 ℃) obtained in example 1, fig. 9 is a peak profile of O in X-ray photoelectron diffraction spectroscopy (XPS) of the modified activated carbon fiber (treated at 850 ℃) obtained in example 1, and fig. 10 is a peak profile of N in X-ray photoelectron diffraction spectroscopy (XPS) of the modified activated carbon fiber (treated at 850 ℃) obtained in example 1.
In fig. 5 to 10, the content ratio of C, O, N elements is shown in table 1, and the content ratio of functional groups is shown in tables 2, 3, and 4. As can be seen, the C, O element content varied greatly before and after the treatment, and the decrease in the oxygen-containing functional group-OH was large.
FIG. 11 is a Fourier infrared spectrum of an activated carbon fiber as it is and a modified activated carbon fiber (treated at 850 ℃ C.) obtained in example 1. As is apparent from fig. 11, the modified activated carbon fiber has a significantly lower — OH content than the activated carbon fiber as it is, which directly affects the pH of the activated carbon fiber.
Table 5 shows the results of the soaking experiments of the activated carbon fibers, and it can be seen from the data in table 5 that the pH value of the soaking solution of the modified activated carbon fibers in the soaking experiments does not exceed 0.5 unit, and the pH change meets the standard of sanitary water quality standards for drinking water (2001).
Example 2:
and (3) washing the 202mm × 550mm activated carbon fiber with deionized water for 10min, rolling up after squeezing, and placing in an effective heating area of a tube furnace. Setting the heating rate of the tube furnace at 5 ℃/min, using the flowing inert gas as the protective gas, the flow rate is 300ml/min, heating to 800 ℃ (or 850 ℃), and keeping the temperature at 800 ℃ (or 850 ℃) for 5 min. Cooling to room temperature in a tube furnace, and taking out for later use.
Placing the above heat-treated sample in a filter element, packaging, pumping deionized water at a flow rate of 1.8-2L/min by a pump to flush the filter element, draining the deionized water after flushing for 30min, pumping the soak solution in the filter element at a flow rate of 1.8-2L/min by a pump, plugging a water inlet and a water outlet of the filter element by a plug after pumping the soak solution for 2min, simultaneously taking a blank soak solution without the filter element as a control, and placing the above liquid in a dark place at normal temperature for soaking for 24 +/-1 h. Then pouring out the soaking solution, and measuring the pH value of the soaked liquid.
Table 6 shows the results of the soaking experiment of the water purification cartridge packaged with activated carbon fibers, and it can be seen from the data in table 6 that the pH value of the soaking solution of the modified activated carbon fibers obtained in example 2 in the soaking experiment does not exceed 0.5 unit, and the pH change meets the standard of sanitary water quality code for drinking water (2001).
Table 7 shows the results of the removal rate test of the water purification filter element packaged with activated carbon fibers, and the comparison shows that the removal rate of the modified activated carbon fiber filter element is over 78%, which is increased by about 10% -20%.
Description of the attached tables:
table 1 shows the proportions of the respective elements in the activated carbon fiber;
table 2 shows the ratio of the content of the functional group of C element in the activated carbon fiber;
table 3 shows the ratio of the content of the functional group of O element in the activated carbon fiber;
table 4 shows the ratio of the content of N functional groups in the activated carbon fiber;
table 5 shows the results of the activated carbon fiber soaking test;
table 6 shows the results of the soaking experiments of the water purification cartridge packaged with activated carbon fibers;
table 7 shows the COD removal rate test results of the water purification cartridge packaged with activated carbon fibers.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
TABLE 5
TABLE 6
TABLE 7
Other configurations and operations of the modification method according to the embodiment of the present invention will be known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the terms "embodiment," "example," "specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples without interference or contradiction.
Claims (10)
1. A modification method for ensuring the sanitary and safe soaking pH of an activated carbon fiber water purification material to reach the standard is characterized by comprising the following steps:
washing the activated carbon fiber with water, and squeezing to dry after washing;
placing the extruded active carbon fiber in a heating device capable of providing inert gas protection for roasting;
and cooling the roasted material to room temperature to obtain the modified activated carbon fiber.
2. The modification method according to claim 1, wherein the activated carbon fibers are washed with deionized water or pure water.
3. The modification method according to claim 1, wherein the washing time for washing the activated carbon fiber is not less than 2min, and the activated carbon fiber is squeezed to a water content of not less than 10%.
4. The modification method according to claim 1, wherein the baking conditions are such that after exhausting air with a circulating inert gas having a flow rate not less than a predetermined flow rate, the circulating inert gas having the predetermined flow rate is continuously kept as a shielding gas, the temperature is raised to a predetermined temperature range at a temperature raising rate not less than a predetermined temperature raising rate, and the baking is performed for not less than a predetermined time under the condition within the predetermined temperature range.
5. The modification method according to claim 4, wherein the predetermined flow rate is 50 ml/min.
6. The modification method according to claim 4, wherein the predetermined temperature increase rate is 2 ℃/min.
7. The modification method according to claim 4, wherein the predetermined temperature is in a range of 700 ℃ to 1000 ℃ and the predetermined time is 2 min.
8. The modification method according to claim 4, wherein the predetermined temperature is in a range of 800 ℃ to 850 ℃ and the predetermined time is 5 min.
9. The modification method according to claim 1, wherein the cooling to room temperature is carried out under the condition that an inert gas is continuously fed through a heating device capable of providing an inert gas shield, and the modified activated carbon fiber is obtained after cooling and taking out.
10. The modification method according to claim 1, further comprising the steps of:
cutting the activated carbon fibers into required sizes before washing the activated carbon fibers.
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