CN103816884A - Preparation method of titanium dioxide-loaded nanometer active carbon fiber - Google Patents
Preparation method of titanium dioxide-loaded nanometer active carbon fiber Download PDFInfo
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Abstract
The invention discloses a preparation method of titanium dioxide-loaded nanometer active carbon fiber and relates to an active carbon material preparation technology. The preparation method comprises the following steps: purifying bacterial cellulose obtained by bacterial fermentation, freeze-drying, immersing the bacterial cellulose in a titanium dioxide precursor solution, carrying out ultrasonic treatment, cleaning with ethanol, putting the bacterial cellulose in an atmosphere furnace for carbonization treatment and heating to 550-600 DEG C, cooling the material, immersing the material in a potassium hydroxide aqueous solution for 10-30 min, drying and then further carrying out activation treatment, and cooling to obtain a three-dimensional net structured composite material of active carbon fiber with uniformly-loaded titanium dioxide crystals. The preparation technology is simple and practical, is convenient to operate and has low cost. The obtained composite material has advantages of high load capacity of titanium dioxide, high combination degree with nanometer active carbon fiber, good spatial net structure, high photocatalytic activity, good adsorption effect and high repetitiveness, and can be applied to biomedical, environmental protection and waste water and exhaust gas treatment fields and the like.
Description
Technical field
The present invention relates to active carbon material field, refers to especially a kind of nanometer activated carbon fiber preparation method of carried titanium dioxide.
Background technology
Organic pollution in optically catalytic TiO 2 oxidative degradation environment is a kind of novel pollution control technology occurring in recent years, the advantages such as it has that chemical stability is high, cost is low, oxidability is strong, good degrading effect and nontoxic pollution-free, have huge application prospect at waste water treatment and other field of Environment Protections.The toxin that while titanium dioxide under light or environmental energy effect can decompose rapidly microorganism and generation thereof reaches antibacterial effect.
Activated carbon fiber is the third generation activated carbon products after powdered activated carbon and grain active carbon, is a class porous fiber shape sorbing material.It has bigger serface, loose structure and strong surface reaction, and its special fibrous physics form makes itself and adsorbate have larger contact area, thereby has the absorption property of wide spectrum and high adsorption capacity.Compared with powdery, granule activated carbon, the micro mist dirt that activated carbon fiber in use produces is few, can make as required the various products such as felt, cloth, paper, more flexible when use.Therefore, activated carbon fiber more and more receives people's concern in the application of the aspects such as chemical industry, environmental protection, electronics industry, medical, food hygiene.
Simple titanium dioxide is distributed in solution and carries out photochemical catalytic oxidation, has and reclaims difficult shortcoming, therefore generally all titanium dioxide granule is loaded on carrier.Activated carbon fiber has higher specific area, is the ideal carrier of carried titanium dioxide.And nanometer activated carbon fiber is to have increased nano effect in many performance basis of activated carbon fiber, make nanometer activated carbon fiber there is stronger adsorption capacity, the faster rate of adsorption.Titanium dichloride load can be improved to load capacity to nanometer activated carbon fiber, accelerate photocatalysis efficiency and can meet the instructions for uses of field to carried titanium dioxide composite such as military affairs, environmental protection, biology, medical treatment simultaneously.
This patent adopts the presoma as nanometer activated carbon fiber through the bacteria cellulose of specially treated, and through ultrasonic immersing, carbonization treatment, activation processing, finally obtains having the composite of uniform load titanium dioxide crystal on the activated carbon fiber of three-dimensional net structure.Preparation is simple in the present invention, easy to operate, cost is low; the composite titanium dichloride load amount obtaining is high, strong with nanometer activated carbon fiber conjugation; and have that good spacial framework, photocatalytic activity are high, advantages of good adsorption effect, can be applicable to the fields such as bio-medical, environmental protection, wastewater and waste gas treatment.
Summary of the invention
The object of this invention is to provide a kind of nanometer activated carbon fiber preparation method of carried titanium dioxide.Relate to a kind of active carbon material technology of preparing.Preparation is simple in the present invention, easy to operate, cost is low; the composite titanium dichloride load amount obtaining is high, strong with nanometer activated carbon fiber conjugation; and have that good spacial framework, photocatalytic activity are high, advantages of good adsorption effect, recycling degree be high, can be applicable to the fields such as bio-medical, environmental protection, wastewater and waste gas treatment.
The invention discloses a kind of nanometer activated carbon fiber preparation method of carried titanium dioxide, comprise: by the bacteria cellulose purification process being obtained by bacterial fermentation, freeze drying, then dried bacteria cellulose material is immersed in TiO 2 precursor solution, ultrasonic processing 30～60min is also heated to 550 ℃～600 ℃ with putting into atmosphere furnace carbonization treatment after ethanol cleaning, after material cooled, put into potassium hydroxide aqueous solution and soak 10～30min, further activation processing of warp after oven dry, after cooling, obtain the composite of uniform load titanium dioxide crystal on a kind of activated carbon fiber with three-dimensional net structure.
As preferred technical scheme:
Wherein, the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above, described bacterium refers to and can, by the bacterial strain of fermented-producing bacteria cellulose, comprise: one or more in acetobacter xylinum, rhizobium, Sarcina, pseudomonas, achromobacter, Alcaligenes, Aerobacter or azotobacter.
The nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above, described purification process refers to, bacteria cellulose is through sodium hydrate aqueous solution thermophilic digestion 10～30min of 10～20wt%.In the bacteria cellulose raw material of bacterial fermentation, have the residual body of a large amount of bacteriums, these residues form local defect by material in the process of carbonization, activation, have a strong impact on porous aperture and the three-dimensional net structure of the nanometer activated carbon fiber obtaining.Sodium hydroxide solution boiling can thoroughly be removed mycoprotein and be sticked to the residual media on cellulose membrane, guarantees the cellulose high-purity of bacteria cellulose material.Meanwhile, NaOH can play certain activation in follow-up activation processing.
The nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above, described freeze drying refers to the bacteria cellulose after purification process freezing 12～24h, then vacuum drying 24～48h at-20 ℃～-80 ℃.Three-dimensional network microstructure when freeze drying object is to maintain bacteria cellulose hygrometric state.
The nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above, described TiO 2 precursor solution refers to that titanium tetraisopropylate is dissolved in the mixed solution obtaining in absolute ethyl alcohol, wherein titanium tetraisopropylate and absolute ethyl alcohol volume ratio are 1:4～6.Titanium tetraisopropylate is hydrolysis in ultrasonic procedure, forms gradually TiO 2 sol and mutually combines with the nanometer three-dimensional net structure fiber of bacteria cellulose.
The nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above; described carbonization treatment refers to that material is under vacuum, argon gas or nitrogen protection; be warming up to 550 ℃～600 ℃ by room temperature; wherein 100～300 ℃ of interval heating rates are 5～10 ℃/min; 300～500 ℃ of interval heating rates are 1～5 ℃/min, and 500～600 ℃ of interval heating rates are 30 ℃/min.In this patent, calefactive interzone is divided into three sections of controls, 100～300 ℃ of intervals are mainly bacteria cellulose and lose physical absorption water, Hydrogenbond water and intermolecular hydrogen bonding, intramolecular hydrogen bond fracture decomposition; To being deposited in the titanium dioxide high-temperature calcination processing on bacteria cellulose nanofiber surface, make titanium dioxide crystallization formation Detitanium-ore-type and crystal be tending towards gradually perfect simultaneously.300～500 ℃ of intervals are mainly the fracture of bacteria cellulose carbochain decomposes, and generates a small amount of volatilization gas; Titanium dioxide crystal is further grown, complete gradually, and it is complete that lattice structure is tending towards.These two keys that calefactive interzone is material carbonisation, in bacteria cellulose carbonisation, quality can significantly reduce, and volume can be along with contraction.In the meantime in order to maintain the original three-dimensional net structure of bacteria cellulose, must the strict heating rate of controlling carbonisation, prevent that the too fast network structure that causes of heating rate from subsiding.500～600 ℃ of interval bacteria cellulose carbonizations complete; And titanium dioxide crystal presents complete Detitanium-ore-type crystalline phase.
The nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above; described activation processing refer to potassium hydroxide aqueous solution soak after material put into nitrogen protection activation furnace heat up heating; heating-up temperature is 700～900 ℃, and temperature retention time is 10～60min.The carbon fiber soaking with potassium hydroxide aqueous solution, in heating process along with the evaporation of fibrous inside steam, can go out the potassium hydroxide granule that some are evenly distributed in fiber surface crystallization, in the time that activating treatment temperature raises, these granule original positions are reacted with carbon, etch some at the equally distributed nanometer micropore of fiber surface, as the interface of continuing reaction, along with the continuation of activation temperature raises, the steam of part metals potassium, sylvite is got between carbon-coating, and the activation of whole carbon fiber is played to facilitation.In like manner, in bacteria cellulose purification process process, residual NaOH also has the active effect that potassium hydroxide is identical.Therefore,, in this patent, the activation effect of activated carbon fiber is the synergistic result of NaOH and potassium hydroxide.There is partial phase change in titanium dioxide crystal in this course simultaneously, changed to rutile phase by Detitanium-ore-type crystalline phase, can adjust by controlling heating-up temperature the crystalline phase ratio of titanium dioxide in product.
The nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above, described coolingly refers to that the bacteria cellulose material heating up after finishing slowly cools to room temperature in atmosphere furnace or activation furnace.
The nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as above, described composite refers to that the activated carbon fiber diameter with three-dimensional network space structure is about 10～30nm, is evenly distributed with 0.5～2nm micropore and fiber surface and is combined with equally distributed titanium dioxide crystal on fiber.
Compared with prior art, the invention has the beneficial effects as follows:
This patent adopts the presoma as nanometer activated carbon fiber through the bacteria cellulose of specially treated, with TiO 2 sol precipitation infusion process, titanium dioxide crystal is evenly distributed on to the surface of three-dimensional manometer activated carbon fiber.Through carbonization treatment, activation processing, finally obtains the composite of uniform load titanium dioxide crystal on a kind of activated carbon fiber with three-dimensional net structure.In preparation process, kept to greatest extent the original three-dimensional network space structure of bacteria cellulose, fiber carbonization treatment and titanium dioxide calcining are carried out simultaneously; Utilize its synergistic activation effect of NaOH and potassium hydroxide and fast, efficiently prepare the controlled nanometer activated carbon fiber composite of carried titanium dioxide crystalline phase by rational temperature control.Preparation is simple in the present invention, easy to operate, cost is low; the composite titanium dichloride load amount obtaining is high, strong with nanometer activated carbon fiber conjugation; and have that good spacial framework, photocatalytic activity are high, advantages of good adsorption effect, recycling degree be high, can be applicable to the fields such as bio-medical, environmental protection, wastewater and waste gas treatment.
Accompanying drawing explanation
Fig. 1 is the each group of clearance rate comparison to benzene.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1:
The bacteria cellulose obtaining being fermented by Alcaligenes and Aerobacter is placed in the sodium hydrate aqueous solution thermophilic digestion 30min of 10wt%, and by material freezing 24h at-80 ℃, then vacuum drying 24h.
Dried bacteria cellulose material is immersed in the TiO 2 precursor solution that titanium tetraisopropylate mixes with absolute ethyl alcohol 1:4 volume ratio, ultrasonic processing 30min, and after cleaning with ethanol, put into atmosphere furnace and heat up and be heated to 550 ℃ and carry out carbonization treatment by room temperature under nitrogen protection, wherein 100～300 ℃ of interval heating rates are 5 ℃/min, 300～500 ℃ of interval heating rates are 1 ℃/min, and 500～550 ℃ of interval heating rates are 30 ℃/min; Intensification finishes rear material and in atmosphere furnace, slowly cools to room temperature.
The potassium hydroxide aqueous solution of material after carbonization being put into 10wt% soaks 30min, inserts in the activation furnace of nitrogen protection and heat up and be heated to 700 ℃ after oven dry, and temperature retention time is 60min.Insulation finishes rear material and in activation furnace, slowly cools to the activated carbon fiber diameter that room temperature obtains having three-dimensional network space structure and be about 30nm, on fiber, be evenly distributed with 2nm micropore and fiber surface and be combined with equally distributed titanium dioxide crystal, wherein titanium dioxide crystal is complete Detitanium-ore-type crystalline phase.
Embodiment 2:
The bacteria cellulose obtaining being fermented by acetobacter xylinum is placed in the sodium hydrate aqueous solution thermophilic digestion 20min of 15wt%, and by material freezing 24h at-20 ℃, then vacuum drying 24h.
Dried bacteria cellulose material is immersed in the TiO 2 precursor solution that titanium tetraisopropylate mixes with absolute ethyl alcohol 1:4 volume ratio, ultrasonic processing 40min, and after cleaning with ethanol, put into atmosphere furnace and heat up and be heated to 600 ℃ and carry out carbonization treatment by room temperature under vacuum, wherein 100～300 ℃ of interval heating rates are 5 ℃/min, 300～500 ℃ of interval heating rates are 1 ℃/min, and 500～600 ℃ of interval heating rates are 30 ℃/min; Intensification finishes rear material and in atmosphere furnace, slowly cools to room temperature.
The potassium hydroxide aqueous solution of material after carbonization being put into 20wt% soaks 20min, inserts in the activation furnace of nitrogen protection and heat up and be heated to 800 ℃ after oven dry, and temperature retention time is 30min.Insulation finishes rear material and in activation furnace, slowly cools to the activated carbon fiber diameter that room temperature obtains having three-dimensional network space structure and be about 10nm, is evenly distributed with 0.5nm micropore and fiber surface and is combined with equally distributed titanium dioxide crystal on fiber.Wherein titanium dioxide crystal is take Detitanium-ore-type crystalline phase as leading and coexisting with rutile phase.
Embodiment 3:
The bacteria cellulose obtaining being fermented by Sarcina and pseudomonas is placed in the sodium hydrate aqueous solution thermophilic digestion 10min of 20wt%, and by material freezing 12h at-30 ℃, then vacuum drying 48h.
Dried bacteria cellulose material is immersed in the TiO 2 precursor solution that titanium tetraisopropylate mixes with absolute ethyl alcohol 1:5 volume ratio, ultrasonic processing 50min, and after cleaning with ethanol, put into atmosphere furnace and heat up and be heated to 560 ℃ and carry out carbonization treatment by room temperature under vacuum, wherein 100～300 ℃ of interval heating rates are 6 ℃/min, 300～500 ℃ of interval heating rates are 2 ℃/min, and 500～560 ℃ of interval heating rates are 30 ℃/min; Intensification finishes rear material and in atmosphere furnace, slowly cools to room temperature.
The potassium hydroxide aqueous solution of material after carbonization being put into 30wt% soaks 10min, inserts in the activation furnace of nitrogen protection and heat up and be heated to 900 ℃ after oven dry, and temperature retention time is 10min.Insulation finishes rear material and in activation furnace, slowly cools to the activated carbon fiber diameter that room temperature obtains having three-dimensional network space structure and be about 15nm, is evenly distributed with 1nm micropore and fiber surface and is combined with equally distributed titanium dioxide crystal on fiber.Wherein titanium dioxide crystal is take rutile phase as leading and coexisting with Detitanium-ore-type crystalline phase.
Embodiment 4:
The bacteria cellulose obtaining being fermented by achromobacter and azotobacter is placed in the sodium hydrate aqueous solution thermophilic digestion 20min of 12wt%, and by material freezing 24h at-40 ℃, then vacuum drying 24h.
Dried bacteria cellulose material is immersed in the TiO 2 precursor solution that titanium tetraisopropylate mixes with absolute ethyl alcohol 1:5 volume ratio, ultrasonic processing 60min and clean with ethanol after put into atmosphere furnace and heat up and be heated to 580 ℃ and carry out carbonization treatment by room temperature under argon shield, wherein 100～300 ℃ of interval heating rates are 8 ℃/min, 300～500 ℃ of interval heating rates are 3 ℃/min, and 580 ℃ of interval heating rates are 30 ℃/min; Intensification finishes rear material and in atmosphere furnace, slowly cools to room temperature.
The potassium hydroxide aqueous solution of material after carbonization being put into 30wt% soaks 30min, inserts in the activation furnace of nitrogen protection and heat up and be heated to 700 ℃ after oven dry, and temperature retention time is 20min.Insulation finishes rear material and in activation furnace, slowly cools to the activated carbon fiber diameter that room temperature obtains having three-dimensional network space structure and be about 20nm, is evenly distributed with 1.5nm micropore and fiber surface and is combined with equally distributed titanium dioxide crystal on fiber.Wherein titanium dioxide crystal is Detitanium-ore-type crystalline phase.
Embodiment 5:
The bacteria cellulose obtaining being fermented by rhizobium is placed in the sodium hydrate aqueous solution thermophilic digestion 10min of 10wt%, and by material freezing 12h at-80 ℃, then vacuum drying 48h.
Dried bacteria cellulose material is immersed in the TiO 2 precursor solution that titanium tetraisopropylate mixes with absolute ethyl alcohol 1:6 volume ratio, ultrasonic processing 60min, and after cleaning with ethanol, put into atmosphere furnace and heat up and be heated to 600 ℃ and carry out carbonization treatment by room temperature under argon shield, wherein 100～300 ℃ of interval heating rates are 10 ℃/min, 300～500 ℃ of interval heating rates are 5 ℃/min, and 500～600 ℃ of interval heating rates are 30 ℃/min; Intensification finishes rear material and in atmosphere furnace, slowly cools to room temperature.
The potassium hydroxide aqueous solution of material after carbonization being put into 20wt% soaks 30min, inserts in the activation furnace of nitrogen protection and heat up and be heated to 750 ℃ after oven dry, and temperature retention time is 40min.Insulation finishes rear material and in activation furnace, slowly cools to the activated carbon fiber diameter that room temperature obtains having three-dimensional network space structure and be about 25nm, is evenly distributed with 1.8nm micropore and fiber surface and is combined with equally distributed titanium dioxide crystal on fiber.Wherein titanium dioxide crystal is complete Detitanium-ore-type crystalline phase.
Experimental example 1: the nanometer activated carbon fiber photo-catalysis capability test of carried titanium dioxide
Measure its catalytic activity take methyl orange as simulating pollution thing:
It it is 5 groups by experiment component: group 1: negative control group (commercially available cocoanut active charcoal); Group 2-4: of the present invention group (nano active carbon of carried titanium dioxide prepared by embodiment 1-3); Group 5: positive controls (TiO prepared by Chinese invention patent CN102861563A embodiment 1
2/ AC).Accurately get the beaker that catalyst 0.15g is placed in 150mL, add 5.0 × 10
-5the methyl orange aqueous solution 150mL of g/mL, soaked overnight, wait to reach absorption saturated after, slowly outwell supernatant, then add the methyl orange solution of 25mL same concentrations, be placed at (10cm place) under 40W uviol lamp, open uviol lamp, the degradation rate of the nano active C catalyst of mensuration carried titanium dioxide to methyl orange, light degradation is after 80 minutes, and result is as follows:
The photocatalytic activity of the each catalyst of table 1 to methyl orange
| ? | Negative control group | 1 group of embodiment | 2 groups of embodiment | 3 groups of embodiment | Positive controls |
| Methyl orange degradation rate (%) | 48.6 | 92.3 | 82.1 | 86.2 | 81.5 |
Degradation rate=(concentration of the front methyl orange of the concentration/catalysis of methyl orange after 1-catalysis) × 100% of methyl orange.
Use same catalyst sample by each group, repeat above-mentioned experiment, and the methyl orange degradation rate of the each experiment of record.If this degradation rate and last registration value relatively lower than 2%, continue to repeat.If degradation rate exceedes 2%, stop experiment, record the access times of this sample, result is as following table:
The each catalyst of table 2 is reused number of times comparison
| ? | Negative control group | 1 group of embodiment | 2 groups of embodiment | 3 groups of embodiment | Positive controls |
| Access times | 2 | 13 | 13 | 10 | 7 |
Access times are to use same catalyst to make degradation rate change the number of times that is less than 2%.
Show by above experiment, use the photo-catalysis capability of nanometer activated carbon fiber of the carried titanium dioxide that technical scheme of the present invention prepares the strongest, and be better than common activated carbon sample far away, the catalyst of also preparing higher than prior art.In addition, material recycling degree prepared by the present invention, significantly better than other each group, is reused 10 above degradation rates variations and is all less than 2%, has greatly saved cost, environmental protection.
Experimental example 2: the nanometer activated carbon fiber photo-catalysis capability test 2 of carried titanium dioxide
Measure its catalytic activity take benzene as simulating pollution thing:
It it is 5 groups by experiment component: group 1: negative control group (commercially available cocoanut active charcoal); Group 2-4: of the present invention group (nano active carbon of carried titanium dioxide prepared by embodiment 1-3); Group 5: positive controls (TiO prepared by Chinese invention patent CN102861563A embodiment 1
2/ AC).This experiment adopts batch (-type) light reaction system.1.0g sample is dropped into from the sample tap of quartzy Photoreactor, be evenly distributed on the bottom of reactor; Then system is evacuated, gets a certain amount of benzene liquid with micro syringe, be injected in the quartzy Photoreactor of vacuum state; Be 21% oxygen to being filled with percent by volume in system, 79% nitrogen, makes the pressure of system reach 1.01 × 10
5pa.The quartzy Photoreactor that finite concentration pollutant is housed is put into light reaction case, it is respectively the 8W uviol lamp of 365 nm by dominant wavelength, dominant wavelength is that 8W uviol lamp and the dominant wavelength of 254 nm is the 500W high voltage mercury lamp radiation quartz reactor of 365 nm, and the distance of lamp and quartzy Photoreactor is 20cm.Before each light reaction, first the quartzy Photoreactor dark place that pollutant is housed is left standstill to 40min, then open light source, every 10min, from the sample tap of quartzy Photoreactor, with the airtight pin sampling of 1mL, be injected into and in gas chromatograph, analyze mensuration.
Result is referring to accompanying drawing 1.
From figure, show known, aspect the elimination efficiency for pollutant benzene, 3 groups of embodiment all can remove completely in 50 minutes, and commercially available active carbon and positive control only can be removed part benzene in 60 minutes, and technical scheme of the present invention has shown more excellent effect.
Claims (10)
1. a nanometer activated carbon fiber for carried titanium dioxide, is characterized in that: carried titanium dioxide crystal composition on the activated carbon fiber of being made up of bacteria cellulose, described bacteria cellulose is obtained by bacterial fermentation.
2. the nanometer activated carbon fiber preparation method of a carried titanium dioxide, it is characterized in that: by the bacteria cellulose purification process being obtained by bacterial fermentation, freeze drying, then dried bacteria cellulose material is immersed in TiO 2 precursor solution, ultrasonic processing 30～60min is also heated to 550 ℃～600 ℃ with putting into atmosphere furnace carbonization treatment after ethanol cleaning, after material cooled, put into potassium hydroxide aqueous solution and soak 10～30min, further activation processing of warp after oven dry, after cooling, obtain the composite of uniform load titanium dioxide crystal on a kind of activated carbon fiber with three-dimensional net structure.
3. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2, it is characterized in that: described bacterium refers to and can, by the bacterial strain of fermented-producing bacteria cellulose, comprise: one or more in acetobacter xylinum, rhizobium, Sarcina, pseudomonas, achromobacter, Alcaligenes, Aerobacter or azotobacter.
4. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2, is characterized in that: described purification process refers to, bacteria cellulose is through sodium hydrate aqueous solution thermophilic digestion 10～30min of 10～20wt%.
5. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2, it is characterized in that: described freeze drying refers to the bacteria cellulose after purification process freezing 12～24h, then vacuum drying 24～48h at-20 ℃～-80 ℃.
6. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2, it is characterized in that: described TiO 2 precursor solution refers to that titanium tetraisopropylate is dissolved in the mixed solution obtaining in absolute ethyl alcohol, and wherein titanium tetraisopropylate and absolute ethyl alcohol volume ratio are 1:4～6.
7. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2; it is characterized in that: described carbonization treatment refers to that material is under vacuum, argon gas or nitrogen protection; be warming up to 550 ℃～600 ℃ by room temperature; wherein 100～300 ℃ of interval heating rates are 5～10 ℃/min; 300～500 ℃ of interval heating rates are 1～5 ℃/min, and 500～600 ℃ of interval heating rates are 30 ℃/min.
8. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2; it is characterized in that: described activation processing refer to potassium hydroxide aqueous solution soak after material put into nitrogen protection activation furnace heat up heating; heating-up temperature is 700～900 ℃, and temperature retention time is 10～60min.
9. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2, is characterized in that: described coolingly refer to that the material heating up after finishing slowly cools to room temperature in atmosphere furnace or activation furnace.
10. the nanometer activated carbon fiber preparation method of a kind of carried titanium dioxide as claimed in claim 2, it is characterized in that: described composite refers to that the activated carbon fiber diameter with three-dimensional network space structure is about 10～30nm, on fiber, be evenly distributed with 0.5～2nm micropore, and fiber surface is combined with equally distributed titanium dioxide crystal.
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