CN108273391B - Nanofiltration membrane for heavy metal treatment - Google Patents
Nanofiltration membrane for heavy metal treatment Download PDFInfo
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- CN108273391B CN108273391B CN201810310189.2A CN201810310189A CN108273391B CN 108273391 B CN108273391 B CN 108273391B CN 201810310189 A CN201810310189 A CN 201810310189A CN 108273391 B CN108273391 B CN 108273391B
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- nanofiltration membrane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the field of sewage treatment, and particularly discloses a nanofiltration membrane for heavy metal treatment and a preparation method thereof. The preparation method comprises the following steps: adding inorganic nanoparticles and other raw materials into a solvent, performing ultrasonic dispersion, and heating in a water bath until the solvent is evaporated to obtain an intermediate; blending the treated intermediate with sulfonated polyether sulfone powder and an additive in a mixer, then melting and extruding the mixture by an extruder, passing the mixture through a spinneret plate, spinning the mixture into a nanofiltration membrane substrate, and respectively cleaning the membrane by organic matters and deionized water; then pouring the coating filling materials into a fluidized bed for melting; and (3) immersing the nanofiltration membrane substrate into a fluidized bed for reaction to prepare the nanofiltration membrane for heavy metal treatment. The nanofiltration membrane prepared by the method solves the problem that the rejection rate of the nanofiltration membrane to heavy metal ions is not high in the prior art, and improves the sewage purification capacity of the nanofiltration membrane.
Description
Technical Field
The invention relates to the field of sewage purification, and particularly discloses a nanofiltration membrane for heavy metal treatment.
Background
In recent years, national environmental protection policies put forward more and more strict requirements and restrictions on industrial wastewater treatment, and wastewater treatment and efficient recycling are widely regarded by industrial enterprises. In order to improve the reuse rate of the wastewater, the nanofiltration membrane technology becomes an important means for wastewater reuse and is widely applied to industrial production. However, the industrial salt-containing wastewater has complex components, contains high hardness, heavy metal ions, silicon, various salts and organic matters, and has high treatment difficulty. Most enterprises discharge the strong brine after retreating to reach the standard, and still have the problem of low water resource utilization rate and environmental pollution.
At present, the rejection rate of the nanofiltration membrane on salt-containing substances (Na +, K +, Cl-, SO 42-) in wastewater is high, but the rejection rate on heavy metal ions, sulfur and other pollutants is low, and the efficiency of purifying the wastewater only through the nanofiltration membrane is not high.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a nanofiltration membrane for heavy metal treatment.
In order to achieve the above purpose, the present invention adopts the following scheme.
A preparation method of a nanofiltration membrane comprises the following steps: adding nanoscale inorganic particles, a styrene-isoprene-styrene block copolymer, stearidonic acid and poly (internal olefin) into deionized water, performing ultrasonic dispersion, and heating in a water bath until solvent water is evaporated to obtain an intermediate; blending the treated intermediate with sulfonated polyether sulfone powder and an additive in a mixer, then melting and extruding the mixture by an extruder, and spinning the mixture into a nanofiltration membrane substrate through a spinneret plate, wherein the nanofiltration membrane substrate has a uniform nano-pore structure; washing the obtained nanofiltration membrane base material by organic matters and deionized water respectively; and pouring cocamidopropyl dimethylamine ethyl lactone, methacrylic acid and tetrasodium iminodisuccinate into a fluidized bed for melting, immersing the nanofiltration membrane substrate into the fluidized bed, taking out the nanofiltration membrane substrate after reaction, and cooling to obtain the nanofiltration membrane for treating heavy metal.
The method is characterized in that tetrasodium iminodisuccinate is used as a heavy metal complex and can be complexed with heavy metal ions in sewage, and a mixture of cocamidopropyl dimethylamine caprolactone, methacrylic acid and tetrasodium iminodisuccinate is coated and filled on the surface and the hollow part of the nanofiltration membrane through a fluidized bed, so that the complexing capacity of the nanofiltration membrane for the heavy metal ions is improved, and the rejection rate of the nanofiltration membrane for the heavy metal ions is improved.
Further, the inorganic nanoparticles are alumina or titanium dioxide.
Further, the additive is coconut oil or olive oil.
Further, the organic matter is diesel oil or naphtha.
Furthermore, the weight ratio of the nano-scale inorganic particles to the styrene-isoprene-styrene block copolymer, the stearidonic acid and the poly-internal olefin is (10-15): (30-45): (3-7): (9-13).
Further, the number of carbon atoms of the poly (internal olefin) monomer is 20.
Furthermore, the weight ratio of the intermediate to the sulfonated polyether sulfone powder and the additive is (1-1.1): 3-6): 0.2-0.4.
Further, the weight ratio of the cocamidopropyl dimethylamine ethyl lactone to the methacrylic acid and the imino disuccinic acid tetrasodium is (6-8): (10-13): (1-1.3). The mixture of cocamidopropyl dimethylamine ethylene lactone, methacrylic acid and imino disodium disuccinate accounts for 5 to 7 percent of the total weight of the membrane.
By controlling the parameters of the fluidized bed, it is preferred to coat and fill a mixture of cocamidopropyl dimethylamine ethylene lactone and methacrylic acid, tetrasodium iminodisuccinate in an amount of 5% to 7% of the total weight of the membrane. It has been found that less than 5% by weight of the mixture based on the total weight of the membrane does not ensure an effective metal ion retention capacity, and that more than 7% by weight of the mixture results in the mixture blocking the pore size in the membrane, reducing the passage rate of the wastewater per unit time.
A nanofiltration membrane for heavy metal treatment can be prepared by the method.
The invention has the beneficial effects that: the nanofiltration membrane and the preparation method thereof solve the problem that the rejection rate of the nanofiltration membrane on heavy metal ions is not high in the prior art, and improve the sewage purification capacity of the nanofiltration membrane.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example one
The embodiment provides a preparation method of a nanofiltration membrane for heavy metal treatment, which specifically comprises the following steps: adding nano alumina particles, styrene-isoprene-styrene segmented copolymer, stearidonic acid and poly (internal olefin) into deionized water according to the weight ratio of 10:45:3:9, performing ultrasonic dispersion by an ultrasonic dispersion machine, and heating in a water bath until solvent water is evaporated to obtain an intermediate; blending the treated intermediate with sulfonated polyether sulfone powder and coconut oil in a mixer according to the weight ratio of 1:6:0.2, then melting and extruding the mixture by an extruder, and spinning the mixture into a nanofiltration membrane substrate through a spinneret plate, wherein the nanofiltration membrane substrate has a uniform nano-pore structure; washing the obtained nanofiltration membrane base material by naphtha and deionized water respectively; then pouring cocamidopropyl dimethylamine ethyl lactone, methacrylic acid and tetrasodium iminodisuccinate in a weight ratio of 6:10:1.3 into a fluidized bed for melting, and immersing the nanofiltration membrane substrate into the fluidized bed, wherein the parameters of the fluidized bed are set as follows: air flow rate: 5700m3/h, introduction rate: 670 g/min, carrier weight: 78kg, temperature of the air fed: and (3) coating and filling a mixture of cocamidopropyl dimethylamine ethyl lactone, methacrylic acid and tetrasodium iminodisuccinate at the temperature of 210 ℃ to 7% of the total weight of the membrane, taking out the membrane after reaction, and cooling to obtain the nanofiltration membrane for treating the heavy metal.
Example two
The embodiment provides a preparation method of a nanofiltration membrane for heavy metal treatment, which specifically comprises the following steps: adding nano-scale titanium dioxide particles, styrene-isoprene-styrene segmented copolymer, stearidonic acid and poly (internal olefin) into deionized water according to the weight ratio of 15:30:7:13, performing ultrasonic dispersion by an ultrasonic dispersion machine, and heating in a water bath until solvent water is evaporated to obtain an intermediate; blending the treated intermediate with sulfonated polyether sulfone powder and olive oil in a mixer according to the weight ratio of 1.1:3:0.4, then melting and extruding the mixture by an extruder, and spinning the mixture into a nanofiltration membrane substrate through a spinneret plate, wherein the nanofiltration membrane substrate has a uniform nano-pore structure; cleaning the obtained nanofiltration membrane base material by diesel oil and deionized water respectively; then pouring cocamidopropyl dimethylamine ethylene lactone, methacrylic acid and tetrasodium iminodisuccinate in a weight ratio of 8:13:1 into a fluidized bed for melting, and immersing the nanofiltration membrane substrate into the fluidized bed, wherein the parameters of the fluidized bed are set as follows: air flow rate: 5500m3/h, introduction rate: 550 g/min, carrier weight: 78kg, temperature of the air fed: and (3) coating and filling a mixture of cocamidopropyl dimethylamine ethyl lactone, methacrylic acid and tetrasodium iminodisuccinate at the temperature of 210 ℃ to 5% of the total weight of the membrane, taking out the membrane after reaction, and cooling to obtain the nanofiltration membrane for treating the heavy metal.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (2)
1. A preparation method of a nanofiltration membrane for heavy metal treatment is characterized by comprising the following steps: adding nano inorganic particles, styrene-isoprene-styrene segmented copolymer, stearidonic acid and poly internal olefin into deionized water, performing ultrasonic dispersion, and heating in a water bath until solvent water is evaporated to obtain an intermediate; blending the treated intermediate with sulfonated polyether sulfone powder and an additive in a mixer, then melting and extruding the mixture by an extruder, and spinning the mixture into a nanofiltration membrane substrate through a spinneret plate, wherein the nanofiltration membrane substrate has a uniform nano-pore structure; washing the obtained nanofiltration membrane base material by organic matters and deionized water respectively; pouring cocamidopropyl dimethylamine ethyl lactone, methacrylic acid and tetrasodium iminodisuccinate into a fluidized bed for melting, immersing a nanofiltration membrane substrate into the fluidized bed, taking out after reaction, and cooling to obtain a nanofiltration membrane for treating heavy metal; the nano inorganic particles are aluminum oxide or titanium dioxide; the additive is coconut oil or olive oil; the organic matter is diesel oil or naphtha; the weight ratio of the nano inorganic particles to the styrene-isoprene-styrene block copolymer, the stearidonic acid and the poly internal olefin is (10-15): (30-45): (3-7): (9-13); the number of carbon atoms of the monomer before polymerization of the poly-internal olefin is 20; the weight ratio of the intermediate to the sulfonated polyether sulfone powder to the additive is (1-1.1) to (3-6) to (0.2-0.4); the weight ratio of the cocoamidopropyl dimethylamine ethyl lactone to the methacrylic acid and the imino disuccinic acid tetrasodium is (6-8) to (10-13) to (1-1.3); the mixture of cocamidopropyl dimethylamine ethyl lactone, methacrylic acid and imino disuccinic acid tetrasodium accounts for 5-7% of the total weight of the nanofiltration membrane.
2. A nanofiltration membrane for heavy metal treatment is characterized in that: prepared by the method of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810310189.2A CN108273391B (en) | 2018-04-09 | 2018-04-09 | Nanofiltration membrane for heavy metal treatment |
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| CN201810310189.2A CN108273391B (en) | 2018-04-09 | 2018-04-09 | Nanofiltration membrane for heavy metal treatment |
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| CN108273391B true CN108273391B (en) | 2020-11-27 |
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| US6013151A (en) * | 1998-05-15 | 2000-01-11 | Clopay Plastic Products Company, Inc. | High speed method of making microporous film products |
| CN103055722B (en) * | 2012-12-25 | 2014-12-24 | 武汉纺织大学 | Nanofiber membrane with heavy metal absorption function and preparation method thereof |
| CN106621859B (en) * | 2016-10-27 | 2017-11-21 | 启迪清源（北京）科技有限公司 | The preparation method of plasma grafting polyvinylidene fluoride resin NF membrane |
| CN106750811A (en) * | 2016-12-27 | 2017-05-31 | 广西中烟工业有限责任公司 | A kind of antibacterial, anti-oxidant, metal-chelating multifunctional plastic and preparation method thereof |
| CN107151539B (en) * | 2017-04-20 | 2019-07-02 | 临安福斯特热熔网膜有限公司 | A kind of automotive upholstery environment-friendly hot-melt glue film and preparation method and purposes |
| CN107715702B (en) * | 2017-11-14 | 2020-07-03 | 天津工业大学 | Alcohol amine modified graphene oxide/polyvinylidene fluoride blending film for gas-liquid film contactor and preparation method thereof |
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