CN102755842B - Preparation method of hollow fiber membranes for waste water treatment - Google Patents
Preparation method of hollow fiber membranes for waste water treatment Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 11
- 239000012510 hollow fiber Substances 0.000 title abstract description 9
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 74
- 229960000892 attapulgite Drugs 0.000 claims abstract description 72
- 238000009987 spinning Methods 0.000 claims abstract description 57
- 239000002033 PVDF binder Substances 0.000 claims abstract description 34
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 239000007788 liquid Substances 0.000 claims description 44
- 239000000835 fiber Substances 0.000 claims description 43
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 30
- 239000012153 distilled water Substances 0.000 claims description 24
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 22
- 239000006228 supernatant Substances 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 230000010355 oscillation Effects 0.000 claims description 14
- 238000001556 precipitation Methods 0.000 claims description 14
- 238000001291 vacuum drying Methods 0.000 claims description 14
- 235000012489 doughnuts Nutrition 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 11
- 235000011187 glycerol Nutrition 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 230000001112 coagulating effect Effects 0.000 claims description 10
- 238000001891 gel spinning Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000005119 centrifugation Methods 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000000967 suction filtration Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 21
- 150000002500 ions Chemical class 0.000 abstract description 17
- 238000001179 sorption measurement Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract description 3
- 238000011068 loading method Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000009396 hybridization Methods 0.000 abstract 1
- 239000002202 Polyethylene glycol Substances 0.000 description 13
- 229920001223 polyethylene glycol Polymers 0.000 description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 239000000047 product Substances 0.000 description 9
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 6
- 238000013019 agitation Methods 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000004088 foaming agent Substances 0.000 description 5
- 235000016768 molybdenum Nutrition 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- -1 nickel Chemical class 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000005183 environmental health Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005616 pyroelectricity Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a preparation method of hollow fiber membranes for waste water treatment, belongs to the technical field of membranes, and particularly relates to a preparation technique of organic-inorganic hybridization hollow fiber membranes. A heavy metal ion adsorption type polyvinylidene fluoride (PVDF) hollow fiber membrane contains modified attapulgite, and the mass ratio of the PVDF and the modified attapulgite is 1:0.01-1:0.1. The hollow fiber membranes have the advantages of being good in withstand voltage performance, free of support body, big in loading density in a membrane assembly, big in unit volume membrane area and flux and the like, and the membrane assembly can be made into any size and shape. In addition, hybrid membrane spinning of the preparation method is good in performance, simple in process in a spinning film formation process and low in cost.
Description
Technical field
The invention belongs to membrane technology field, particularly a kind of technology of preparing of hybrid inorganic-organic hollow-fibre membrane.Be specially a kind of prepare with PVDF membrane material and attapulgite clay compounded hydridization heavy metal ion is had to the hollow fiber ultrafiltration membrane of adsorption function.
Background technology
Along with the fast development of chemical industry and metallurgical industry, contain lead, copper, be just on the rise every the contaminated wastewater of the heavy metal ion such as, chromium, mercury from what produce in electrolyte, electroplate liquid and mining, metal smelt process, heavy metal wastewater thereby pollutes has become serious environment and social concern, is a crucial difficult problem for current economic development in the urgent need to address and Environmental Health, safe drinking water aspect.
In recent years, inorganic material more and more receives researcher's concern to the absorption property of heavy metal ion.Part inorganic mineral material cost is low and obvious to the absorption property of heavy metal ion, particularly noticeable aspect heavy metal ion adsorbed, and wherein attapulgite is that tool is typically a kind of.
Attapulgite claims that again palygorskite (or claim Palygorskite) is a kind of natural nonmetallic mineral material, be a kind of have chain layer structure containing Shuifu County's magnesium silicate clay mineral, typical chemical formula is Si
8mg
6o
20(OH)
2(OH
2)
44H
2o, structure belongs to 2:1 type clay mineral, and in each 2:1 unit structure layer, tetrahedron wafer angle is pushed up direction at a certain distance and is put upside down, and forms layer chain.Form the passage parallel with chain, filling zeolite water and the crystallization water in passage at tetrahedron bar interband.Its fibre structure generally comprises three levels: 1. basic structural unit is micro-bar-shaped or fibrous monocrystal, is called for short rod brilliant.2. the monocrystalline bundle being formed by the parallel gathering of monocrystalline.3. mutually pile up by crystalline substance bundle (comprising that rod is brilliant) aggregation forming.The special construction of attapulgite makes it have very large specific area, and physical absorption is very capable.On the other hand, attapulgite is with aspect negative electrical charge, adsorbed the cation with interchangeability so that charge balance at interlayer, and attapulgite has just had stronger ionic adsorption exchange capacity like this.Attapulgite modified have a very strong heavy metal ion adsorbed ability, can be applied in the processing application of heavy metal-containing waste water, and attapulgite be applied in heavy metal-containing wastewater treatment, have that adsorption treatment is effective, cost is low, the advantage such as simple that is widely used, regenerates, there is good development prospect.
Membrane separation technique is studied widely and explores as a kind of new and high technology is existing in Industrial Wastewater Treatment field, because its separative efficiency is high,, non-secondary pollution simple, easy and simple to handle without phase transformation, energy-conserving and environment-protective, equipment, separated product be easy to reclaim, automaticity advantages of higher, make it there is sizable technical advantage in water treatment field, become one of indispensable technology in water treatment field.At present, Kynoar (PVDF) is a kind of separation membrane material of high comprehensive performance, and its good mechanical performance has good resistance to impact, wearability and belt cutting-resisting property, also has the properties such as piezoelectricity, dielectricity and pyroelectricity.The chemical stability of PVDF is good, at room temperature do not corroded by acid, alkali, strong oxidizer and halogen, very stable to organic solvents such as aliphatic hydrocarbon, aromatic hydrocarbon, alcohols and aldehydes, in hydrochloric acid, nitric acid, sulfuric acid and rare, high alkali liquid (mass fraction 40%) and at up to 100 DEG C of temperature, its performance is substantially constant.In addition, PVDF has excellent anti-gamma-rays, ultraviolet radiation and ageing-resistant performance, and its film is placed in for a long time and does not outdoorly become fragile, and does not chap.
But PVDF diffusion barrier does not have adsorption effect to heavy metal ion.At present aspect PVDF modification and the research of PVDF and inorganic matter hydridization diffusion barrier and production field, diffusion barrier for heavy metal ion adsorbed type is studied rarely seen report, especially utilize the adsorptivity of inorganic mineral attapulgite to heavy metal ion, the research that preparation has the PVDF-attapulgite hydridization diffusion barrier of adsorption function to heavy metal ion there is not yet report.
Summary of the invention
Be applied to the deficiency of heavy metal ion adsorbed aspect for existing PVDF diffusion barrier, the technical problem that quasi-solution of the present invention is determined is to provide a kind of preparation method of the hollow-fibre membrane for wastewater treatment, and this film product has adsorption function to heavy metal ion such as lead, cadmium, nickel, molybdenums.
The present invention, by inorganic mineral attapulgite is carried out to modification, is then dispersed in spinning liquid, adopts dry-wet spinning technique, spins out hydridization hollow fiber separating film heavy metal ion to adsorption function.
Preparation method for the hollow-fibre membrane of wastewater treatment is as follows:
1. the preparation of spinning liquid.Take PVDF and add in the container that is placed with DMF (DMF), add polyethylene glycol (PEG).Said vesse is placed in to 50 DEG C～70 DEG C water-baths, and stirring and dissolving obtains casting film feed liquid; Attapulgite modified to adding in feed liquid, making PVDF and attapulgite modified mass ratio is 1:0.01～1:0.1, fully stirs and sonic oscillation makes the dispersed spinning liquid that obtains of attapulgite.
2. the preparation of hollow-fibre membrane.Spinning liquid is poured in film dry-wet spinning machine machine still, sealing spinning-drawing machine still, heating spinning-drawing machine still, makes spinning liquid temperature at 25 DEG C～50 DEG C, and vacuumizing and defoaming is processed 20～60 minutes.After spinning liquid deaeration is disposed, open still gate out switch, in still, pass into nitrogen pressurization, open measuring pump switch, adjust 8～20 revs/min of rotating speeds, start spinning.
The doughnut of extruding from spinneret is wound up on take up roll after by the coagulating bath of 20 DEG C～30 DEG C, and controlling take up roll rotating speed is 10～25 revs/min.After spinning finishes, coiler device is shut down, and takes off fiber, and the hollow-fibre membrane spinning out is soaked one week in distilled water; Hollow-fibre membrane is soaked in glycerine water solution 1～2 day, and taking-up is dried, and obtains hollow-fibre membrane.
The mass ratio of described PVDF in DMF is 15%～20%;
The mass ratio of described PEG in DMF is 5%～10%.
In coagulating bath water tank and core flow container, inject distilled water, coagulating bath water tank plays the freezing action of hollow-fibre membrane outer wall, and the core liquid in core flow container leads in hollow-fibre membrane inner tube, and film inwall is played to freezing action.
In described glycerine water solution, glycerine and water volume ratio are 1:1.
Film dry-wet spinning machine and attached coagulating bath water tank thereof and core flow container, nitrogen pot, drafting system etc. are connected before spinning.
Preparation method attapulgite modified in described step 1 is as follows.Take 10g～20g particle diameter 300 order～1000 object attapulgites, wash with 1L distilled water, precipitation is got its supernatant liquor, after the centrifugal 1min of 500rpm, get its supernatant liquor, in supernatant liquor, add a small amount of distilled water and mix the centrifugal 1min of rear continuation 500rpm, then get its supernatant liquor, after cyclic washing supernatant liquor like this 3～5 times, finally carry out centrifugation with 4000rpm, get its precipitation, vacuum drying 24h at 90 DEG C, selects 300 order～1000 order sieve by particle size after grinding, obtains purifying attapulgite.
Configuration concentration is the hydrochloric acid solution of 2.5mol/L～3mol/L, getting 10g～20g purifying attapulgite and 150mL～200mL hydrochloric acid solution joins in small beaker and is uniformly mixed, after 5min, mixture is heated to 70～80 DEG C, stirs 1h～2h, then sonic oscillation 30min～40min, suction filtration, be washed with distilled water to pH and be about 6 left and right, vacuum drying 24h at 90 DEG C, ground 300 order～1000 mesh sieves and obtained attapulgite modified.
The heavy metal adsorption performance that product utilization attapulgite of the present invention is superior, can effectively adsorb Pb In Exhausted Water, every heavy metal ion such as, nickel, molybdenums, and attapulgite consumption in system is few, little on the key property such as mechanical strength, the permeability impact of PVDF hollow-fibre membrane.In addition, China Jiangsu, Anhui have the abundant attapulgite resource of reserves, and attapulgite price is comparatively cheap, and with respect to hollow-fibre membrane, product cost impact of the present invention is little.
Beneficial effect:
Product of the present invention preparation does not need special installation, industrializing implementation easy, and technique is simple in general, and the cost of film changes little.This hollow fiber separating film product is to the lead in the waste water such as free electrolyte, electroplate liquid, have good effect every heavy metal ion such as, nickel, molybdenums.In addition, prepared by the present invention is hybrid organic-inorganic film, has concentrated the advantage of PVDF diffusion barrier and the absorption property of attapulgite, film stable physical property, and pure water flux and hydrophily are improved to some extent.
Product of the present invention is hollow fiber separating film, have good pressure-resistant performance, without supporter, membrane module can make in arbitrary size and shape, membrane module that loading density is large, unit volume membrane area and the advantage such as flux is large.In addition, hybridized film spinning properties of the present invention is good, is spun to that membrane process technique is simple, cost is low.
Detailed description of the invention:
The following examples can make the present invention of those skilled in the art comprehend, but do not limit the present invention in any way
Embodiment 1:
(1) preparation of spinning solution.Take in the beaker that PVDF adds the DMF that fills 500mL, PVDF mass percent in DMF is 18%.Adding molecular weight is 10000 pore-foaming agent PEG, PEG addition for mass percent in DMF be 8%.Beaker is put in 60 DEG C of water-baths, and under electromagnetic agitation, makes dissolution of solid obtain casting film feed liquid.A certain amount of attapulgite modified to adding in feed liquid, the mass ratio that makes PVDF and attapulgite is 1:0.01, fully stirs and sonic oscillation is uniformly dispersed it to obtain spinning solution.
(2) preparation of PVDF-attapulgite hydridization hollow-fibre membrane.Spinning liquid is poured in film dry-wet spinning machine machine still, sealing spinning-drawing machine still, heating spinning-drawing machine still, makes spinning liquid temperature at 25 DEG C, and vacuumizing and defoaming is processed 30 minutes.After spinning liquid deaeration is disposed, open still gate out switch, in still, pass into nitrogen pressurization, open measuring pump switch, adjust 10 revs/min of rotating speeds, start spinning.
The doughnut of extruding from spinneret is wound up on take up roll after by the coagulating bath of 20 DEG C, and controlling take up roll rotating speed is 10 revs/min.After spinning finishes, coiler device is shut down, and takes off fiber, and the hollow-fibre membrane spinning out is soaked one week in distilled water, within 2-3 days, changes water once; ; Hollow-fibre membrane is soaked in glycerine water solution 1 day, and taking-up is dried, and obtains PVDF-attapulgite hydridization hollow-fibre membrane.
The modification of attapulgite.Take 10g particle diameter 300 object attapulgites, with the washing of 1L distilled water, precipitation is got its supernatant liquor, then after cyclic washing 3 times, after the centrifugal 1min of 500rpm, get its supernatant liquor, carry out centrifugation with 4000rpm, get its precipitation, vacuum drying 24h at 90 DEG C, grinds the purifying attapulgite that sieves to obtain.
Configuration concentration is the hydrochloric acid solution of 2.5mol/L, getting 10g purifying attapulgite and 150mL hydrochloric acid solution joins in small beaker and is uniformly mixed, after 5min, mixture is heated at 70 DEG C and stirs 1h, then sonic oscillation 30min, suction filtration, be washed with distilled water to pH and be about 6 left and right, vacuum drying 24h at 90 DEG C, grinds and sieves attapulgite modifiedly.
Embodiment 2: substantially with example 1
(1) preparation of spinning solution.Take in the beaker that PVDF adds the DMF that fills 500mL, PVDF mass percent in DMF is 16%.Adding molecular weight is 10000 pore-foaming agent PEG, PEG addition for mass percent in DMF be 8%.Beaker is put in 60 DEG C of water-baths, and under electromagnetic agitation, makes dissolution of solid obtain casting film feed liquid.A certain amount of attapulgite modified to adding in feed liquid, the mass ratio that makes PVDF and attapulgite is 1:0.05, fully stirs and sonic oscillation is uniformly dispersed it to obtain casting solution.
(2) preparation of PVDF-attapulgite hydridization hollow-fibre membrane.Spinning liquid is poured in film dry-wet spinning machine machine still, sealing spinning-drawing machine still, heating spinning-drawing machine still, makes spinning liquid temperature at 30 DEG C, and vacuumizing and defoaming is processed 40 minutes.After spinning liquid deaeration is disposed, open still gate out switch, in still, pass into nitrogen pressurization, open measuring pump switch, adjust 10 revs/min of rotating speeds, start spinning.
The doughnut of extruding from spinneret is wound up on take up roll after by the coagulating bath of 30 DEG C, and controlling take up roll rotating speed is 10 revs/min.After spinning finishes, coiler device is shut down, and takes off fiber, and the hollow-fibre membrane spinning out is soaked one week in distilled water, within 2-3 days, changes water once; Hollow-fibre membrane is soaked in glycerine water solution 2 days, and taking-up is dried, and obtains PVDF-attapulgite hydridization hollow-fibre membrane.
(1) modification of attapulgite.Take 15g particle diameter 300 object attapulgites, with the washing of 1L distilled water, precipitation is got its supernatant liquor, then after cyclic washing 4 times, after the centrifugal 1min of 500rpm, get its supernatant liquor, carry out centrifugation with 4000rpm, get its precipitation, vacuum drying 24h at 90 DEG C, grinds the purifying attapulgite that sieves to obtain.
Configuration concentration is the hydrochloric acid solution of 3mol/L, getting 10g purifying attapulgite and 150mL hydrochloric acid solution joins in small beaker and is uniformly mixed, after 5min, mixture is moved in round-bottomed flask, be heated at 70 DEG C and stir 1h, then sonic oscillation 30min, suction filtration, is washed with distilled water to pH and is about 6 left and right, vacuum drying 24h at 90 DEG C, grinds and sieves attapulgite modifiedly.
Embodiment 3:
(1) preparation of spinning solution.Take in the beaker that PVDF adds the DMF that fills 500mL, PVDF mass percent in DMF is 17%.Adding molecular weight is 10000 pore-foaming agent PEG, PEG addition for mass percent in DMF be 10%.Beaker is put in 60 DEG C of water-baths, and under electromagnetic agitation, makes dissolution of solid obtain casting film feed liquid.A certain amount of attapulgite modified to adding in feed liquid, the mass ratio that makes PVDF and attapulgite is 1:0.05, fully stirs and sonic oscillation is uniformly dispersed it to obtain casting solution.
(2) preparation of PVDF-attapulgite hydridization hollow-fibre membrane.Spinning liquid is poured in film dry-wet spinning machine machine still, sealing spinning-drawing machine still, heating spinning-drawing machine still, makes spinning liquid temperature at 40 DEG C, and vacuumizing and defoaming is processed 30 minutes.After spinning liquid deaeration is disposed, open still gate out switch, in still, pass into nitrogen pressurization, open measuring pump switch, adjust 15 revs/min of rotating speeds, start spinning.
The doughnut of extruding from spinneret is wound up on take up roll after by the coagulating bath of 30 DEG C, and controlling take up roll rotating speed is 20 revs/min.After spinning finishes, coiler device is shut down, and takes off fiber, and the hollow-fibre membrane spinning out is soaked one week in distilled water, within 2-3 days, changes water; Hollow-fibre membrane is soaked in glycerine water solution 1 day, and taking-up is dried, and obtains PVDF-attapulgite hydridization hollow-fibre membrane.
The modification of attapulgite.Take 20g particle diameter 500 object attapulgites, with the washing of 1L distilled water, precipitation is got its supernatant liquor, then after cyclic washing 4 times, after the centrifugal 1min of 500rpm, get its supernatant liquor, carry out centrifugation with 4000rpm, get its precipitation, vacuum drying 24h at 90 DEG C, grinds the purifying attapulgite that sieves to obtain.
Configuration concentration is the hydrochloric acid solution of 3mol/L, getting 10g purifying attapulgite and 200mL hydrochloric acid solution joins in small beaker and is uniformly mixed, after 5min, mixture is moved in round-bottomed flask, be heated at 70 DEG C and stir 2h, then sonic oscillation 30min, suction filtration, is washed with distilled water to pH and is about 6 left and right, vacuum drying 24h at 90 DEG C, grinds and sieves attapulgite modifiedly.
Embodiment 4:
(1) preparation of spinning solution.Take in the beaker that PVDF adds the DMF that fills 500mL, PVDF mass percent in DMF is 20%.Adding molecular weight is 10000 pore-foaming agent PEG, PEG addition for mass percent in DMF be 9%.Beaker is put in 60 DEG C of water-baths, and under electromagnetic agitation, makes dissolution of solid obtain casting film feed liquid.A certain amount of attapulgite modified to adding in feed liquid, the mass ratio that makes PVDF and attapulgite is 1:0.1, fully stirs and sonic oscillation is uniformly dispersed it to obtain casting solution.
(2) preparation of PVDF-attapulgite hydridization hollow-fibre membrane.Spinning liquid is poured in film dry-wet spinning machine machine still, sealing spinning-drawing machine still, heating spinning-drawing machine still, makes spinning liquid temperature at 50 DEG C, and vacuumizing and defoaming is processed 30 minutes.After spinning liquid deaeration is disposed, open still gate out switch, in still, pass into nitrogen pressurization, open measuring pump switch, adjust 20 revs/min of rotating speeds, start spinning.
The doughnut of extruding from spinneret is wound up on take up roll after by the coagulating bath of 30 DEG C, and controlling take up roll rotating speed is 25 revs/min.After spinning finishes, coiler device is shut down, and takes off fiber, and the hollow-fibre membrane spinning out is soaked one week in distilled water, within 2-3 days, changes water; Hollow-fibre membrane is soaked in glycerine water solution 2 days, and taking-up is dried, and obtains PVDF-attapulgite hydridization hollow-fibre membrane.
The modification of attapulgite.Take 15g particle diameter 1000 object attapulgites, wash with 1L distilled water, precipitation is got its supernatant liquor, then after cyclic washing 5 times, after the centrifugal 1min of 500rpm, get its supernatant liquor, carry out centrifugation with 4000rpm, get its precipitation, vacuum drying 24h at 90 DEG C, grinds the purifying attapulgite that sieves to obtain.
Configuration concentration is the hydrochloric acid solution of 3mol/L, getting 20g purifying attapulgite and 200mL hydrochloric acid solution joins in small beaker and is uniformly mixed, after 5min, mixture is moved in round-bottomed flask, be heated at 80 DEG C and stir 2h, then sonic oscillation 40min, suction filtration, is washed with distilled water to pH and is about 6 left and right, vacuum drying 24h at 90 DEG C, grinds and sieves attapulgite modifiedly.
Embodiment 5:
(1) preparation of spinning solution.Take in the beaker that PVDF adds the DMF that fills 500mL, PVDF mass percent in DMF is 18%.Adding molecular weight is 10000 pore-foaming agent PEG, PEG addition for mass percent in DMF be 7%.Beaker is put in 60 DEG C of water-baths, and under electromagnetic agitation, makes dissolution of solid obtain casting film feed liquid.A certain amount of attapulgite modified to adding in feed liquid, the mass ratio that makes PVDF and attapulgite is 1:0.08, fully stirs and sonic oscillation is uniformly dispersed it to obtain casting solution.
(2) preparation of PVDF-attapulgite hydridization hollow-fibre membrane.Spinning liquid is poured in film dry-wet spinning machine machine still, sealing spinning-drawing machine still, heating spinning-drawing machine still, makes spinning liquid temperature at 35 DEG C, and vacuumizing and defoaming is processed 60 minutes.After spinning liquid deaeration is disposed, open still gate out switch, in still, pass into nitrogen pressurization, open measuring pump switch, adjust 20 revs/min of rotating speeds, start spinning.
The doughnut of extruding from spinneret is wound up on take up roll after by the coagulating bath of 20 DEG C, and controlling take up roll rotating speed is 25 revs/min.After spinning finishes, coiler device is shut down, and takes off fiber, and the hollow-fibre membrane spinning out is soaked one week in distilled water, refreshes the water periodically; Hollow-fibre membrane is soaked in glycerine water solution 2 days, and taking-up is dried, and obtains PVDF-attapulgite hydridization hollow-fibre membrane.
The modification of attapulgite.Take 18g particle diameter 800 object attapulgites, with the washing of 1L distilled water, precipitation is got its supernatant liquor, then after cyclic washing 5 times, after the centrifugal 1min of 500rpm, get its supernatant liquor, carry out centrifugation with 4000rpm, get its precipitation, vacuum drying 24h at 90 DEG C, grinds the purifying attapulgite that sieves to obtain.
Configuration concentration is the hydrochloric acid solution of 2.8mol/L, getting 16g purifying attapulgite and 200mL hydrochloric acid solution joins in small beaker and is uniformly mixed, after 5min, mixture is moved in round-bottomed flask, be heated at 75 DEG C and stir 1.5h, then sonic oscillation 40min, suction filtration, is washed with distilled water to pH and is about 6 left and right, vacuum drying 24h at 90 DEG C, grinds and sieves attapulgite modifiedly.
In example 5, film product adsorbs test in 1 hour to containing the effluent containing heavy metal ions such as lead, cadmium, nickel, molybdenum, result shows that product of the present invention is 20% to the adsorption rate of nickel ion, being 19% to the adsorption rate of lead ion, is 21% to the adsorption rate of molybdenum ion, is 20% to the adsorption rate of cadmium ion.
Claims (4)
1. for a doughnut membrane preparation method for wastewater treatment, comprise the steps:
(1) preparation of spinning liquid: take PVDF and add in the container that is placed with DMF, add PEG, said vesse is placed in to 50 DEG C～70 DEG C water-baths, stirring and dissolving obtains casting film feed liquid; Attapulgite modified to adding in feed liquid, making PVDF and attapulgite modified mass ratio is 1:0.01～1:0.1, fully stirs and sonic oscillation makes the dispersed spinning liquid that obtains of attapulgite;
(2) preparation of hollow-fibre membrane: spinning liquid is poured in film dry-wet spinning machine machine still, sealing spinning-drawing machine still, heating spinning-drawing machine still, makes spinning liquid temperature at 25 DEG C～50 DEG C, and vacuumizing and defoaming is processed 20～60 minutes; After spinning liquid deaeration is disposed, open still gate out switch, in still, pass into nitrogen pressurization, open measuring pump switch, adjust 8～20 revs/min of rotating speeds, start spinning; The doughnut of extruding from spinneret is wound up on take up roll after by the coagulating bath of 20 DEG C～30 DEG C, and controlling take up roll rotating speed is 10～25 revs/min; After spinning finishes, coiler device is shut down, and takes off fiber, and the hollow-fibre membrane spinning out is soaked one week in distilled water; Hollow-fibre membrane is soaked in glycerine water solution 1～2 day, and taking-up is dried, and obtains hollow-fibre membrane;
Preparation method attapulgite modified in described step (1) is as follows: take 10g～20g particle diameter 300 order～1000 object attapulgites, wash with 1L distilled water, precipitation is got its supernatant liquor, after the centrifugal 1min of 500rpm, get its supernatant liquor, in supernatant liquor, add a small amount of distilled water and mix the centrifugal 1min of rear continuation 500rpm, then get its supernatant liquor, after cyclic washing supernatant liquor like this 3～5 times, finally carry out centrifugation with 4000rpm, get its precipitation, vacuum drying 24h at 90 DEG C, after grinding, select 300 order～1000 order sieve by particle size, obtain purifying attapulgite,
Configuration concentration is the hydrochloric acid solution of 2.5mol/L～3mol/L, getting 10g～20g purifying attapulgite and 150mL～200mL hydrochloric acid solution joins in small beaker and is uniformly mixed, after 5min, mixture is heated to 70～80 DEG C, stirs 1h～2h, then sonic oscillation 30min～40min, suction filtration, be washed with distilled water to pH and be about 6 left and right, vacuum drying 24h at 90 DEG C, ground 300 order～1000 mesh sieves and obtained attapulgite modified.
2. as claimed in claim 1 for the doughnut membrane preparation method of wastewater treatment, it is characterized in that, the mass ratio of described PVDF in DMF is 15%～20%.
3. as claimed in claim 1 for the doughnut membrane preparation method of wastewater treatment, it is characterized in that, the mass ratio of described PEG in DMF is 5%～10%.
4. as claimed in claim 1 for the doughnut membrane preparation method of wastewater treatment, it is characterized in that, in described glycerine water solution, glycerine and water volume ratio are 1:1.
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| CN103495349A (en) * | 2013-10-11 | 2014-01-08 | 天津汉晴环保科技有限公司 | Composite hollow fibrous membrane capable of adsorbing heavy metal ions and preparation method of composite hollow fibrous membrane |
| CN104587848A (en) * | 2013-11-01 | 2015-05-06 | 贵阳时代沃顿科技有限公司 | A PVDF hollow fiber ultrafiltration membrane and a preparing method thereof |
| CN104209018B (en) * | 2014-09-01 | 2016-06-29 | 淮阴师范学院 | A kind of attapulgite/polyvinylidene fluoride nanometer composite hyperfiltration membrane and preparation method thereof |
| CN106582576A (en) * | 2016-12-31 | 2017-04-26 | 天津汉晴环保科技有限公司 | Heavy metal ion adsorption type hybrid hollow fiber film and production method thereof |
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