CN102424453A - Photocatalysis compound filling material for micro pollution raw material pretreatment and preparation method thereof - Google Patents
Photocatalysis compound filling material for micro pollution raw material pretreatment and preparation method thereof Download PDFInfo
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- CN102424453A CN102424453A CN2011102526427A CN201110252642A CN102424453A CN 102424453 A CN102424453 A CN 102424453A CN 2011102526427 A CN2011102526427 A CN 2011102526427A CN 201110252642 A CN201110252642 A CN 201110252642A CN 102424453 A CN102424453 A CN 102424453A
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Abstract
The invention relates to an inclined helical photocatalysis compound filling material for micro pollution raw material pretreatment, which consists of polypropylene and nanometer TiO2, wherein the mass percentage of nanometer TiO2 is 8 percent to 10 percent. The invention also relates to a preparation method of the photocatalysis compound filling material, which comprises the following steps that: TiO2 is pretreated through titanate coupling agents; and the polypropylene and the pretreated TiO2 are uniformly mixed and are co-extruded and formed on a double-screw extruding machine. The photocatalysis compound filling material has the characteristics that the flowability is high, the specific surface area is large, the TiO2 combination degree is high, the photocatalysis efficiency is higher, the use period is long, the blockage is avoided, the operation is simple and convenient, and the like.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to a kind of pretreated photochemical catalysis compounded mix of micro-polluted raw and preparation method thereof that is used for.
Background technology
Photochemical catalytic oxidation is a kind of approach that utilizes the photochemical reaction degradation of contaminant, can be divided into two types of homogeneous phase and heterogeneous catalysiss.In the homogeneous phase photocatalytic degradation more commonly with Fe
2+Or Fe
3+And H
2O
2Be medium, produce OH through the photo-Fenton reaction and make pollutent obtain degraded; Heterogeneous photocatalytic degradation is to be the special light sensitization oxidation of sensitizing agent with the n N-type semiconductorN.The n N-type semiconductorN is excited under the incident light irradiation of certain wavelength, produces hole and unbound electron on its filled band and the conduction band respectively.There is very strong electronic capability in the hole that is produced by light, can capture the electronics in semiconductor grain surface organic matter or the solvent, finally generates the extremely strong OH of oxidation capacity, makes organic pollutant in the solution oxidized and decompose.
TiO
2As n N-type semiconductorN photocatalysis oxidation reaction catalyzer, have the reaction conditions gentleness, to carry out at normal temperature, normal pressure usually, advantage such as easy to operate has obtained research extensively and profoundly in water treatment field in recent years.Present TiO
2Type of service mainly contain floated and fixed two kinds.
Traditional photochemical catalysis research is generally carried out in outstanding slurry system.Because photocatalyst is suspended in the reaction system with powder morphology, contact area is big, mass transfer effect good, so catalytic efficiency (is high.But significant disadvantage of outstanding slurry catalystsystem is, after photochemical catalysis technology, needs the separation circuit of additional catalyst, and this has just increased the complicacy of device and has built running cost.And suspension type TiO
2Particle is tiny, and usually particle diameter has only tens nanometers, and proportion is less, and traditional filtration, deposition, method such as centrifugal are difficult to TiO
2Photocatalyst separates, reclaims, and the catalyzer after the Separation and Recovery is prone to cohesion, and active decline is bigger, is difficult to regenerated using.In addition, the TiO of suspended state
2Particle stops the irradiation degree of depth that can influence light source to the absorption of light, thus be difficult to carry out mass-producing, commercialization is applied.
With TiO
2Catalyzer is fixed on certain carrier; Although catalystsystem efficient can be lower than outstanding slurry system; But can solve catalyst separating, recovery and regeneration difficult problem effectively, can also select different carriers and load process according to the structure difference of photo catalysis reactor.
The purpose of load is exactly under the prerequisite that guarantees photocatalytic activity, to make carrier and TiO
2Between produce a kind of bonding force, thereby avoid TiO
2Come off.Immobilization as far as catalyzer; At first must guarantee active ingredient ability absorb light; Good photocatalytic activity must depend on the close fit of light and catalyzer, has only the activated catalyzer just to have the photochemical catalysis effect, so the carrier of photocatalyst also is different from general support of the catalyst.Carrier of photocatalyst can be divided into two types substantially: inorganic carrier and organic carrier.Inorganic carrier comprises category of glass, metal species and porous class again.Organic materials is widely used in daily life, if with TiO
2Be carried on the Application Areas that to expand photocatalyst on the organic materials.Macromolecular material stable in properties such as Vestolen PP 7052 are difficult for that in the aqueous solution chemical property takes place and change, and are easy to film forming, are ideal TiO
2Solid support material.
Photocatalyst TiO
2Carrying method a lot, like sol-gel method, chemical Vapor deposition process, liquid phase deposition, sputtering method, binder method and suspended nitride etc., different carrying methods can obtain the functional photocatalyst material of different performance.But above-mentioned load technology still exists stability strong inadequately, and photocatalysis efficiency is undesirable, is difficult to shortcomings such as industrialization.Therefore need to select suitable carriers and carrying method to accomplish to TiO
2Immobilization, stronger TiO can be provided
2Conjugation can keep even improve TiO again
2Photocatalytic activity.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of pretreated photochemical catalysis compounded mix of micro-polluted raw that is applicable to is provided, it is strong that this filler has fluidisation property, and specific surface area is big, TiO
2Conjugation is strong, and photocatalysis efficiency is higher, and life cycle is long, does not stop up, and moves characteristics such as easy.
The technical scheme that the present invention adopts provides a kind of photochemical catalysis compounded mix, and structure is oblique rotating porous compounded mix, by polypropylene carrier and nano-TiO
2Form TiO
2Massfraction be 8%～10%, i.e. TiO
2Quality account for 8%～10% of compounded mix total mass.
Organic degradation speed is relevant with the concentration in electronics and hole.TiO
2Along with reducing of particle diameter, surface atom increases, and efficiency of light absorption improves, and the concentration in its surface electronic and hole will increase, and catalytic activity will improve.TiO
2The particle diameter of powder is more little, and the unit mass population is many more, and surface-area is big more, helps organic preadsorption, help light-catalyzed reaction and carry out from the teeth outwards, thereby light-catalyzed reaction speed and efficient is just high.Work as TiO
2Size when being reduced to nanometer scale, produced quantum size effect and made conduction band and valence-band level become more discrete, the absorbing wavelength blue shift; Energy gap is wideer, and the conduction band current potential is more negative, the corrigendum of valence band current potential; The probability of electronics and hole simple composite is more little, thereby makes nano-TiO
2Has higher photochemical catalytic oxidation reducing power.
TiO
2Massfraction be 8%～10% o'clock, the catalyzed degradation activity is higher, massfraction surpasses 10%, compounded mix becomes plasticity and bad mechanical property.When massfraction surpasses 15%, not only can cause the waste of catalyzer, and excessive catalyzer possibly cause also to the scattering of light effect in reaction process, reduce catalytic effect.Therefore select TiO
2TiO in the/PP compounded mix
2Massfraction is 8%～10%
As preferably, TiO
2Crystal formation is an anatase titanium dioxide, its specific density 3.8～4.1g/cm3, specific refractory power 2.55, Mohs' hardness 5.5～6.0, TiO
2Content>=98%, median size 10nm.
As preferably, photochemical catalysis compounded mix diameter 15～25mm, height 15～25mm, specific surface area＞500cm
2/ g, voidage＞80%, tap density 140～150kg/m
3, packing density is 900～1100kg/m
3
This special construction of photochemical catalysis compounded mix makes it be easy to the fluidisation in full pond, and consumption gas is few, power is economized, and has good aeration to cross the water-based ability.Its rational proportion, make its can not conglomeration, do not stop up, do not pile up, install very simply, directly drop in the water body and get final product.And because the structural unstable of filler itself makes it have great fluidisation property, both improved oxygen-transfer efficiency, can improve the triphasic mass-transfer efficiency of gas, liquid, solid again simultaneously, improved photocatalysis efficiency.Under the situation that does not influence ordinary production, can compare to adapt to the variation of raw water quality through the input of regulating filler easily.
It is the preparation method of oblique rotating porous compounded mix that the present invention also provides a kind of photochemical catalysis compounded mix structure:
(1) TiO
2Pre-treatment
20～30mg titanate coupling agent and 10～20mL ethanol are mixed, be heated to 80 ℃～90 ℃, stir, react after 3～6 hours, the adding mass ratio is 1%～2% TiO
2Powder, and fully stir, when the ethanol boiling evaporate into quantity of solvent 1～2mL, add the ethanol of equal in quality ratio more repeatedly; According to the method described above, repeat 2～4 times; The thick shape colloid of gained is placed in the baking oven, and attemperation is 80 ℃～95 ℃, dries 12～24 hours, and the gained solid is pulverized, ground, and is for use.
(2) TiO
2The preparation of/Vestolen PP 7052 compounded mix
With Vestolen PP 7052 (PP) raw material with through pretreated TiO
2Mix TiO according to proportioning
2Massfraction be 8%～10%; Mix back blend on twin screw extruder; Material enters the screw channel of screw rod from charging opening, and pp material is molten into melt gradually in screw channel, when temperature is 180 ℃～200 ℃; Outwards output under 78kPa～110kPa pressure is through screw extrusion molding.
Photochemical catalysis compounded mix of the present invention is placed reactor drum according to certain packing ratio, under UV-irradiation, the lip-deep TiO of compounded mix
2Be excited, produce hole and unbound electron on its filled band and the conduction band respectively.There is the very strong electronic capability that gets in the hole that is produced by UV-light, and can capture TiO
2Electronics in particle surface organism or the solution generates the extremely strong OH of oxidation capacity, thereby is difficult to biodegradable macromolecule contaminant in the oxygenolysis micro-polluted raw.
Beneficial effect of the present invention is: the pretreated photochemical catalysis compounded mix of micro-polluted raw can have bigger specific surface area, TiO
2In conjunction with firm, difficult drop-off can keep even improve TiO again
2Photocatalytic activity, thereby realize that absorption is with light-catalysed integrated.And fluidisation property is strong, and specific surface area is big, and life cycle is long, does not stop up, and moves characteristics such as easy.Can be difficult to biodegradable macromolecule contaminant in the efficient oxidation decomposition micro-polluted raw, can improve the biodegradability of former water, the performance subsequent biological treatment technology advantage strong to the organic matter removal ability improves COD
MnClearance, reduce follow-up cholorination production of by-products, improve safety of drinking water property.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is photochemical catalysis compounded mix figure.
The present invention relates to a kind of pretreated photochemical catalysis compounded mix of micro-polluted raw that is used for, as shown in Figure 1.Its structure is oblique rotating porous compounded mix, and filler body adopts pp material and the pretreated TiO of process
2According to certain mass ratio (5%～10%) single injection-molded after blend on the twin screw extruder, the compounded mix diameter 15～25mm for preparing, height 15～25mm, specific surface area＞500cm
2/ g, voidage＞80%, tap density 140～150kg/m
3, density is 900～1100kg/m
3
Embodiment
Embodiment 1: 20mg titanate coupling agent and 10mL ethanol are mixed, be heated to 80 ℃, stir, react after 3 hours, the adding mass ratio is 1% TiO
2Powder, and fully stirring evaporate into quantity of solvent when very little (about 1-2ml) until the ethanol boiling, adds the ethanol of equal in quality ratio more repeatedly.According to the method described above, repeat 2 times.The thick shape colloid of gained is placed in the baking oven, and attemperation is 80 ℃, dries 12 hours, and the gained solid is pulverized, ground, and is for use.
With pp material with through pretreated TiO
2Blend on twin screw extruder, TiO
2Massfraction be 8%, material enters the screw channel of screw rod from charging opening, makes pp material in screw channel, be molten into melt gradually, is 180 ℃ in temperature, outwards exports when pressure is 78kPa, and is rotating for tiltedly through screw extrusion molding.The compounded mix diameter 15～25mm for preparing, height 15～25mm, specific surface area＞500cm
2/ g, voidage＞80%, tap density 140～150kg/m
3, density is about 900kg/m
3Under a certain amount of aeration effect, in water, can be fluidized state, the triphasic mass-transfer efficiency of gas, liquid, solid is high, has promoted the photochemical catalysis effect of compounded mix.Under the situation that does not influence ordinary production, through existing utility is transformed, can be easily packing ratio through changing filler to adapt to the variation of water quality.
Embodiment 2: 25mg titanate coupling agent and 15mL ethanol are mixed, be heated to 85 ℃, stir, react after 4.5 hours, the adding mass ratio is 1.5% TiO
2Powder, and fully stirring evaporate into quantity of solvent when very little (about 1-2ml) until the ethanol boiling, adds the ethanol of equal in quality ratio more repeatedly.According to the method described above, repeat 3 times.The thick shape colloid of gained is placed in the baking oven, and attemperation is 85 ℃, dries 18 hours, and the gained solid is pulverized, ground, and is for use.
With pp material with through pretreated TiO
2Blend on twin screw extruder, TiO
2Massfraction be 9%, material enters the screw channel of screw rod from charging opening, makes pp material in screw channel, be molten into melt gradually, is 190 ℃ in temperature, outwards exports when pressure is 94kPa, and is rotating for tiltedly through screw extrusion molding.The compounded mix diameter 15～25mm for preparing, height 15～25mm, specific surface area＞500cm
2/ g, voidage＞80%, tap density 140～150kg/m
3, density is about 1000kg/m
3Under a certain amount of aeration effect, in water, can be fluidized state, the triphasic mass-transfer efficiency of gas, liquid, solid is high, has promoted the photochemical catalysis effect of compounded mix.Under the situation that does not influence ordinary production, through existing utility is transformed, can be easily packing ratio through changing filler to adapt to the variation of water quality.
Embodiment 3: 30mg titanate coupling agent and 20mL ethanol are mixed, be heated to 90 ℃, stir, react after 6 hours, the adding mass ratio is 2% TiO
2Powder, and fully stirring evaporate into quantity of solvent when very little (about 1-2ml) until the ethanol boiling, adds the ethanol of equal in quality ratio more repeatedly.According to the method described above, repeat 4 times.The thick shape colloid of gained is placed in the baking oven, and attemperation is 95 ℃, dries 24 hours, and the gained solid is pulverized, ground, and is for use.
With pp material with through pretreated TiO
2Blend on twin screw extruder, TiO
2Massfraction be 10%, material enters the screw channel of screw rod from charging opening, makes pp material in screw channel, be molten into melt gradually, is 200 ℃ in temperature, outwards exports when pressure is 110kPa, and is rotating for tiltedly through screw extrusion molding.The compounded mix diameter 15～25mm for preparing, height 15～25mm, specific surface area＞500cm
2/ g, voidage＞80%, tap density 140～150kg/m
3, density is about 1100kg/m
3Under a certain amount of aeration effect, in water, can be fluidized state, the triphasic mass-transfer efficiency of gas, liquid, solid is high, has promoted the photochemical catalysis effect of compounded mix.Under the situation that does not influence ordinary production, through existing utility is transformed, can be easily packing ratio through changing filler to adapt to the variation of water quality.
Embodiment 4 TiO
2The selection of massfraction
Select TiO respectively
2Massfraction is 3%, 5%, 8%, 10%, 15%, 17%, prepares different Ti O according to the method for embodiment 2
2The TiO of massfraction
2/ PP photochemical catalysis compounded mix is designated as 3%TiO respectively
2/ PP, 5%TiO
2/ PP, 8%TiO
2/ PP, 10%TiO
2/ PP, 15%TiO
2/ PP, 17%TiO
2/ PP.
6 kinds of different Ti O are investigated in the experiment of employing beaker
2The photochemical catalysis compounded mix of content is the degradation capability of the phenol of 50mg/L to starting point concentration.The beaker of 6 500mL, each adds the phenol of 400ml 50mg/L, is 40% o'clock in the filler packing ratio, investigates different Ti O
2The photochemical catalysis compounded mix Pyrogentisinic Acid's of content clearance, another beaker only adds the phenol of 400ml 50mg/L, and all beakers place on the magnetic stirring apparatus, and intermediate vertical is put into the ultraviolet source that ultraviolet lamp tube provides 254nm.
Take a morsel behind the 30min behind the solution centrifugal, use spectrophotometer, under the 510nm wavelength, measure the absorbancy of phenol solution, to judge the palliating degradation degree of phenol solution.Because within the specific limits, phenol solution concentration and absorbancy are directly proportional, and follow Law of Lambert-Beer, so can add TiO through measuring
2The solution absorbance A of catalyzer and the absorbance A of former phenol solution
0, calculate (A
0-A)/A
0Value is weighed the clearance of phenol solution.
Photochemical catalysis result behind the 30min shows: along with TiO
2The increase of massfraction, TiO
2/ PP compounded mix Pyrogentisinic Acid's clearance also increases gradually.At TiO
2That play photocatalysis in the/PP compounded mix is TiO
2, Vestolen PP 7052 (PP) mainly is the effect of playing carrier.Work as TiO
2TiO in the/PP compounded mix
2Increase, under ultraviolet irradiation, will generate more OH, quickened the speed of photocatalytic degradation.TiO
2Massfraction is that 3%, 5%, 8%, 10%, 17% o'clock phenol clearance is respectively 6.2%, 11.5%, 16.7%, 18.6%, 18.3%.Work as TiO
2Massfraction is 15% o'clock, and Pyrogentisinic Acid's clearance is the highest, reaches 21.7%.
From physical strength, the physical properties of material, 3%, 5%, 8%, 10%TiO
2The TiO of massfraction
2/ PP compounded mix and pure PP filler are approaching, and quality is better, and 15%, 17%TiO
2The TiO of massfraction
2Some embrittlement of/PP compounded mix is sent out shortcake, can cause filler damaged with the hand extruding of exerting oneself.Its reason possibly be because of TiO in the filler
2Too much, TiO
2There is one-tenth plasticity and the mechanical property of having destroyed plastics in particulate.
10%TiO
2The photocatalysis performance of the compounded mix of massfraction compares 15%TiO
2The filler of massfraction is low slightly, and its 30min phenol clearance is 18.6%, and from the physical strength angle, quality is better, and is approaching with pure PP filler.When massfraction surpasses 15%, not only can cause the waste of catalyzer, and excessive catalyzer possibly cause also to the scattering of light effect in reaction process, reduce catalytic effect, therefore select TiO
2TiO in the/PP compounded mix
2Massfraction is 8%～10% comparatively suitable.
Embodiment 5 TiO
2The selection of crystal formation
To the multiple TiO that exists in the market
2Product carries out preliminary screening, obtains the TiO of 4 kinds of representational different sizes
2, difference called after: No. 1 TiO
2, No. 2 TiO
2, No. 3 TiO
2, P
25TiO
2, physical parameter and manufacturer see table 1
Table 1
Wherein, No. 1 TiO
2, No. 2 TiO
2, No. 3 TiO
2Be homemade TiO
2, adopt conventional chlorination preparation technology; No. 3 TiO
2Crystal formation is an anatase titanium dioxide, its specific density 3.8～4.1g/cm3, specific refractory power 2.55, Mohs' hardness 5.5～6.0, TiO
2Content>=98%, median size 10nm.P
25TiO
2Adopt the TiO of a kind of high dispersing of nanometer gas-phase process production for German Degussa
2, belonging to mixed crystal type, the ratio of anatase titanium dioxide and rutile-type is approximately 80: 20, and its photocatalysis performance is superior, in industry, laboratory, be commonly used to as the object of reference that compares photo-catalysis capability, but its price comparison is expensive, is not suitable for heavy industrialization and uses.
As typical pollutant, investigate No. 1 TiO with methylene blue
2, No. 2 TiO
2, No. 3 TiO
2, P
25TiO
2Four kinds of TiO
2According to the photochemical catalysis compounded mix of the method for embodiment 1 preparation degradation effect under UV-irradiation to methylene blue solution.Getting concentration is methylene blue solution 200mL5 part of 20mg/L, and 4 parts of solution respectively add 4 kinds of TiO
2Catalyzer 0.2g, lucifuge stirs 1h, makes solution reach the adsorption-desorption balance.Reaction soln is placed in the homemade photo catalysis reactor, open uv lamp, under magnetic agitation, in solution, blast air simultaneously.
Every 15min takes a morsel behind the solution centrifugal, uses spectrophotometer, under the 664nm wavelength, the absorbancy of measuring methylene blue solution over time, to judge the palliating degradation degree of methylene blue solution.Because within the specific limits, methylene blue solution concentration and absorbancy are directly proportional, and follow Law of Lambert-Beer, so can add TiO through measuring
2The solution absorbance A of catalyzer and the absorbance A of former methylene blue solution
0, calculate (A
0-A)/A
0Value is weighed the degradation rate of methylene blue solution.
The result shows: under UV-light, through the catalyzed degradation of 120min, No. 1 TiO
2, No. 2 TiO
2, No. 3 TiO
2, P
25TiO
2Degradation rate to methylene blue is respectively 47%, 55%, 77% and 83%, and promptly the order of catalytic activity is No. 1 TiO
2＜No. 2 TiO
2＜No. 3 TiO
2＜P
25TiO
2
In four kinds of samples that this experiment is adopted, No. 3 TiO
2, P
25TiO
2Be nano level, can find that its photochemical catalysis effect is obviously than No. 1 TiO
2, No. 2 TiO
2High.Compare No. 3 TiO again
2, P
25TiO
2The photochemical catalysis effect, find No. 3 TiO
2The photochemical catalysis effect be lower than P slightly
25TiO
2, each, the methylene blue degradation rate of section differed about 5% sample time.Consider import TiO
2Price more high than home-made, take all factors into consideration from photocatalysis performance and economy, select homemade TiO at last No. 3
2Be used for the preparation of photochemical catalysis filler.
Embodiment 6 photochemical catalysis compounded mixs stability, photocatalytic activity
In reaction unit, add packing ratio and be 40% the photochemical catalysis compounded mix according to the preparation of embodiment 3 methods, open ultraviolet lamp tube, ultraviolet light intensity is 54W, and flow is 0.18m
3/ h, the residence time is 1h.Adopt the even flow Inlet and outlet water, device moves 60 days continuously.Get instantaneous water sample and measure, survey once appearance every day.From the photochemical catalysis compounded mix to COD
MnLong-term removal effect can find out, the device run duration in, COD
MnClearance be 12.3%～13.5%, kept stable.Because COD
MnClearance does not have downward trend, shows this TiO
2Mode of loading can not cause nano-TiO
2Particle comes off the later stage.The mode of loading of this uniqueness makes the TiO in the photochemical catalysis compounded mix
2Particle combines with Vestolen PP 7052 closely, and the stability of filler strengthens, and photocatalytic activity promotes.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification sheets, must confirm its technical scope according to the claim scope.
Claims (4)
1. one kind is used for the pretreated photochemical catalysis compounded mix of micro-polluted raw, it is characterized in that, described photochemical catalysis compounded mix is oblique rotating porous compounded mix, by pp material and nano-TiO
2The blend extruding forms nano-TiO
2Massfraction be 8%～10%.
2. a kind of pretreated photochemical catalysis compounded mix of micro-polluted raw that is used for according to claim 1 is characterized in that described nano-TiO
2Crystal formation is an anatase titanium dioxide, its specific density 3.8～4.1g/cm
3, specific refractory power 2.55, Mohs' hardness 5.5～6.0, TiO
2Content>=98%, median size 10nm.
3. according to right 1 described a kind of pretreated photochemical catalysis compounded mix of micro-polluted raw that is used for, it is characterized in that diameter 15～25mm, height 15～25mm, specific surface area＞500cm
2/ g, voidage＞80%, tap density 140～150kg/m
3, packing density is 900～1100kg/m
3
4. preparation method who is used for the pretreated photochemical catalysis compounded mix of micro-polluted raw:
1) TiO
2Pre-treatment
20～30mg titanate coupling agent and 10～20mL ethanol are mixed, be heated to 80 ℃～90 ℃, stir, react after 3～6 hours, the adding mass ratio is 1%～2% TiO
2Powder, and fully stir, when the ethanol boiling evaporate into quantity of solvent 1～2mL, add the ethanol of equal in quality ratio more repeatedly; According to the method described above, repeat 2～4 times; The thick shape colloid of gained is placed in the baking oven, and attemperation is 80 ℃～95 ℃, dries 12～24 hours, and the gained solid is pulverized, ground, and is for use.
(2) TiO
2The preparation of/Vestolen PP 7052 compounded mix
With pp material with through pretreated TiO
2Mix TiO according to proportioning
2Massfraction be 8%～10%; Mix back blend on twin screw extruder; Material enters the screw channel of screw rod from charging opening, and pp material is molten into melt gradually in screw channel, be 180 ℃～200 ℃ in temperature; When being 78kPa～110kPa, outwards exports pressure, through screw extrusion molding.
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| CN105036456A (en) * | 2015-06-13 | 2015-11-11 | 常州大学 | Device for degrading organic matters in micro-polluted raw water by two-stage biomembrane-photocatalytic coupled technique |
| CN105347461A (en) * | 2015-11-30 | 2016-02-24 | 无锡工源机械有限公司 | Heterogeneous fenton catalysis filler |
| CN106946312A (en) * | 2017-03-14 | 2017-07-14 | 同济大学 | Utilize the method for photo catalytic cement sill degraded disinfection by-product of drinking water trichloroacetamide |
| CN106946312B (en) * | 2017-03-14 | 2020-04-28 | 同济大学 | Method for degrading drinking water disinfection by-product trichloroacetamide by utilizing photocatalytic cement-based material |
| CN108970646A (en) * | 2018-07-26 | 2018-12-11 | 中原工学院 | Three screw rod legal systems are ready for use on the method and its application for administering the grid of black and odorous water |
| CN108970645A (en) * | 2018-07-26 | 2018-12-11 | 中原工学院 | Three screw rod legal systems are ready for use on the method and its application for administering the film of black and odorous water |
| CN109110909A (en) * | 2018-08-31 | 2019-01-01 | 江苏新亿源环保科技有限公司 | A kind of preparation method of Ag doping modification biological filtrate |
| CN109133329A (en) * | 2018-08-31 | 2019-01-04 | 江苏新亿源环保科技有限公司 | A kind of preparation method of silver ion modified photocatalytic biofilter material |
| CN109179632A (en) * | 2018-08-31 | 2019-01-11 | 江苏新亿源环保科技有限公司 | A kind of preparation method of micro-polluted water polypropylene-base suspended biological filler |
| CN114225950A (en) * | 2021-12-21 | 2022-03-25 | 南京环保产业创新中心有限公司 | Bismuth oxybromide photocatalyst filler and preparation method and application thereof |
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