CN108998892A - A kind of preparation method of chitosan-graphene oxide/polyacrylonitrile double-layer nanometer tunica fibrosa - Google Patents
A kind of preparation method of chitosan-graphene oxide/polyacrylonitrile double-layer nanometer tunica fibrosa Download PDFInfo
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- 229920002239 polyacrylonitrile Polymers 0.000 title claims abstract description 67
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000001523 electrospinning Methods 0.000 claims abstract description 54
- 239000002121 nanofiber Substances 0.000 claims abstract description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229920001661 Chitosan Polymers 0.000 claims abstract description 36
- 239000006185 dispersion Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 15
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 12
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 235000019253 formic acid Nutrition 0.000 claims abstract description 6
- 239000012528 membrane Substances 0.000 claims description 33
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 17
- 238000009987 spinning Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 7
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000010041 electrostatic spinning Methods 0.000 abstract 6
- 239000002202 Polyethylene glycol Substances 0.000 abstract 1
- 229920001223 polyethylene glycol Polymers 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 27
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 3
- 238000003760 magnetic stirring Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 Cd 2+ Chemical class 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011942 biocatalyst Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000002407 tissue scaffold Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
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- D01D5/0007—Electro-spinning
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- D01D5/0007—Electro-spinning
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- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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Abstract
Description
技术领域technical field
本发明涉及一种壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜的制备方法，属于复合材料领域。The invention relates to a preparation method of a chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane, which belongs to the field of composite materials.
背景技术Background technique
石墨烯氧化物由于其巨大的比表面积和丰富的含氧基团(环氧化物，羟基，羰基和羧基)，被广泛用于重金属的处理领域。石墨烯氧化物在去除例如Cd2+，Cu2+，Pb2+和Co2+等重金属离子方面取得了巨大成功。然而，由于其基面和边缘上存在亲水基团，水溶液中的氧化石墨烯表现出高的分散性能。因此，吸附处理后，在水溶液中分离出氧化石墨烯的是非常困难的。Graphene oxide has been widely used in the field of heavy metal processing due to its large specific surface area and abundant oxygen-containing groups (epoxide, hydroxyl, carbonyl, and carboxyl). Graphene oxides have achieved great success in removing heavy metal ions such as Cd 2+ , Cu 2+ , Pb 2+ and Co 2+ . However, graphene oxide in aqueous solution exhibits high dispersion properties due to the presence of hydrophilic groups on its basal plane and edges. Therefore, it is very difficult to isolate graphene oxide in aqueous solution after adsorption treatment.
电纺聚丙烯腈纳米膜可用于许多领域，例如导电纳米纤维，伤口敷料，生物催化剂，组织支架和药物输送系统。聚丙烯腈纳米纤维具有高耐化学性、热稳定性和可湿性，可作为超滤和纳滤膜。Electrospun polyacrylonitrile nanomembranes can be used in many fields, such as conductive nanofibers, wound dressings, biocatalysts, tissue scaffolds, and drug delivery systems. Polyacrylonitrile nanofibers have high chemical resistance, thermal stability, and wettability, and can be used as ultrafiltration and nanofiltration membranes.
为了提高聚丙烯腈纳米纤维重金属吸附和除去微生物的性能，需要掺入功能性化学物质和聚合物。然而将功能性化学物质掺入到纳米纤维中会导致纳米纤维的机械性能包括弹性模量、抗拉强度和韧性降低，例如Pooria Pasbakhsh等人将氧化锌掺入到聚丙烯腈纳米纤维中，发现纤维的抗拉强度和弹性模量分别降低了35％和18％(Makaremi M,etal.Electrospun functionalized polyacrylonitrile–chitosan Bi-layer membranesfor water filtration applications[J].RSC Advances,2016,6(59):53882-53893.)。In order to improve the performance of polyacrylonitrile nanofibers for heavy metal adsorption and removal of microorganisms, the incorporation of functional chemicals and polymers is required. However, the incorporation of functional chemicals into nanofibers will lead to a decrease in the mechanical properties of nanofibers, including elastic modulus, tensile strength and toughness. For example, Pooria Pasbakhsh et al. incorporated zinc oxide into polyacrylonitrile nanofibers and found that The tensile strength and elastic modulus of the fibers were reduced by 35% and 18% respectively (Makaremi M, et al. Electrospun functionalized polyacrylonitrile–chitosan Bi-layer membranes for water filtration applications[J].RSC Advances,2016,6(59):53882 -53893.).
发明内容Contents of the invention
针对现有的掺杂功能化物质的聚丙烯腈纳米纤维存在的机械性能降低的问题，本发明提供了一种壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜的制备方法，极大地改善了聚丙烯腈纳米纤维的机械强度。Aiming at the problem that the mechanical properties of existing polyacrylonitrile nanofibers doped with functional substances are reduced, the invention provides a preparation method of chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane, which is very Greatly improved the mechanical strength of polyacrylonitrile nanofibers.
本发明的技术方案如下：Technical scheme of the present invention is as follows:
一种壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜的制备方法，具体步骤如下：A preparation method of chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane, the specific steps are as follows:
步骤1，氧化石墨烯均匀分散液的制备：Step 1, preparation of graphene oxide uniform dispersion:
将氧化石墨烯置于N，N-二甲基甲酰胺(DMF)中，室温下超声破碎60～120min，得到均匀的氧化石墨烯分散液；Put the graphene oxide in N,N-dimethylformamide (DMF), and ultrasonically crush it at room temperature for 60-120 minutes to obtain a uniform graphene oxide dispersion;
步骤2，氧化石墨烯/聚丙烯腈静电纺丝液的制备：Step 2, preparation of graphene oxide/polyacrylonitrile electrospinning solution:
将聚丙烯腈加入到氧化石墨烯分散液中，室温下以160～200r/min的速度搅拌5～10h，得到氧化石墨烯/聚丙烯腈静电纺丝液；adding polyacrylonitrile to the graphene oxide dispersion, and stirring at a speed of 160 to 200 r/min at room temperature for 5 to 10 hours to obtain a graphene oxide/polyacrylonitrile electrospinning solution;
步骤3，壳聚糖静电纺丝液的制备：Step 3, preparation of chitosan electrospinning solution:
将质量比为6:4～8:2的壳聚糖和聚氧化乙烯溶解在质量分数为40～80％的甲酸溶液中，室温下以200～350r/min的速度搅拌4～8h，离心脱泡处理得到壳聚糖静电纺丝液；Dissolve chitosan and polyethylene oxide with a mass ratio of 6:4 to 8:2 in formic acid solution with a mass fraction of 40 to 80%, stir at room temperature at a speed of 200 to 350r/min for 4 to 8 hours, and centrifuge Bubble treatment obtains chitosan electrospinning solution;
步骤4，壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜的制备：Step 4, preparation of chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane:
采用氧化石墨烯/聚丙烯腈静电纺丝液进行静电纺丝制备氧化石墨烯/聚丙烯腈纳米纤维膜，电纺参数为金属针内径为0.5mm，1～3mL/h的推进速度，纺丝电压14～16kV，接收距离10～15cm，再采用壳聚糖静电纺丝液在氧化石墨烯/聚丙烯腈纳米纤维表面进行静电纺丝，电纺参数为金属针内径为0.3mm，0.1～0.5mL/h的推进速度，纺丝电压16～17kV，接收距离10～15cm，纺丝结束后干燥即得壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜。Graphene oxide/polyacrylonitrile nanofiber membranes were prepared by electrospinning using graphene oxide/polyacrylonitrile electrospinning solution. The voltage is 14-16kV, the receiving distance is 10-15cm, and then the chitosan electrospinning solution is used to perform electrospinning on the surface of graphene oxide/polyacrylonitrile nanofibers. Propelling speed of mL/h, spinning voltage of 16-17kV, receiving distance of 10-15cm, drying after spinning to obtain chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane.
优选地，步骤1中，所述的氧化石墨烯分散液的浓度为1～3mg/L。Preferably, in step 1, the concentration of the graphene oxide dispersion is 1-3 mg/L.
优选地，步骤2中，所述的氧化石墨烯/聚丙烯腈静电纺丝液中，聚丙烯腈占静电纺丝液的质量体积分数为10～15％。Preferably, in step 2, in the graphene oxide/polyacrylonitrile electrospinning solution, the mass volume fraction of polyacrylonitrile in the electrospinning solution is 10-15%.
优选地，步骤3中，所述的壳聚糖的分子量为12万，所述的壳聚糖占静电纺丝液的质量体积分数为1.5～2.5％。Preferably, in step 3, the molecular weight of the chitosan is 120,000, and the mass volume fraction of the chitosan in the electrospinning liquid is 1.5-2.5%.
与现有技术相比，本发明的优点是：Compared with prior art, the advantage of the present invention is:
本发明通过在氧化石墨烯/聚丙烯腈纳米纤维膜表面电纺一层壳聚糖纳米纤维膜，极大地改善了聚丙烯腈纳米纤维的机械强度。本发明方法制备的壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜在重金属离子吸附处理领域具有良好的应用前景。The invention greatly improves the mechanical strength of the polyacrylonitrile nanofiber by electrospinning a layer of chitosan nanofiber membrane on the surface of the graphene oxide/polyacrylonitrile nanofiber membrane. The chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane prepared by the method of the invention has good application prospects in the field of heavy metal ion adsorption treatment.
附图说明Description of drawings
图1为氧化石墨烯/聚丙烯腈纳米纤维(A)、壳聚糖纳米纤维(B)和壳聚糖-聚丙烯腈纳米纤维(C)的扫描电镜图。Fig. 1 is the scanning electron micrograph of graphene oxide/polyacrylonitrile nanofiber (A), chitosan nanofiber (B) and chitosan-polyacrylonitrile nanofiber (C).
具体实施方式Detailed ways
下面结合实施例和附图对本发明作进一步详述。The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings.
实施例1Example 1
(1)在3mL的N,N二甲基甲酰胺中加入3mg氧化石墨烯，再超声破碎分散60min，制得1mg/mL的氧化石墨烯分散液。(1) Add 3 mg of graphene oxide into 3 mL of N,N dimethylformamide, and then ultrasonically crush and disperse for 60 min to prepare a 1 mg/mL graphene oxide dispersion.
(2)将0.45g的聚丙烯腈加入到氧化石墨烯的分散液中，在室温下，180r/min，磁力搅拌10～15h，制得静电纺丝液。(2) Add 0.45 g of polyacrylonitrile into the graphene oxide dispersion liquid, and stir it magnetically at 180 r/min for 10-15 h at room temperature to prepare an electrospinning liquid.
(3)将聚丙烯腈纺丝溶液静置6小时以除去溶液中的气泡，进行电纺，静电纺丝接收基材为铝箔纸。电纺参数：金属内径为0.51mm，在15kV的电压下，接收距离为10cm，以1.4mL/h的推进速度进行电纺，得到氧化石墨烯/聚丙烯腈纳米纤维膜。(3) The polyacrylonitrile spinning solution was left to stand for 6 hours to remove air bubbles in the solution, and electrospinning was performed, and the receiving substrate of the electrospinning was aluminum foil paper. Electrospinning parameters: the inner diameter of the metal is 0.51mm, the receiving distance is 10cm at a voltage of 15kV, and the electrospinning is performed at a propulsion speed of 1.4mL/h to obtain a graphene oxide/polyacrylonitrile nanofiber membrane.
(4)将质量比为6:4的0.0878g的壳聚糖和0.0585g的聚氧化乙烯加入到4.4mL的50％甲酸溶液中，在室温下，300r/min，磁力搅拌10～15h，制得壳聚糖静电纺丝液。(4) Add 0.0878g of chitosan and 0.0585g of polyethylene oxide with a mass ratio of 6:4 to 4.4mL of 50% formic acid solution, at room temperature, 300r/min, magnetic stirring for 10-15h, prepared To obtain chitosan electrospinning solution.
(5)将壳聚糖纺丝溶液静置3小时以除去溶液中的气泡，进行电纺，静电纺丝接收基材为聚丙烯腈纳米纤维膜。电纺参数：金属针内径为0.33mm，在16.5kV的电压下，接收距离为10cm，以0.3mL/h的推进速度进行电纺。(5) The chitosan spinning solution was left to stand for 3 hours to remove air bubbles in the solution, and electrospinning was performed, and the receiving substrate of the electrospinning was a polyacrylonitrile nanofiber membrane. Electrospinning parameters: the inner diameter of the metal needle is 0.33mm, the receiving distance is 10cm under the voltage of 16.5kV, and the electrospinning is performed at the advancing speed of 0.3mL/h.
(6)制备的纳米纤维膜在50℃干燥箱中烘干即得到一种壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜。(6) The prepared nanofiber membrane was dried in a drying oven at 50° C. to obtain a chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane.
实施例2Example 2
(1)在3mL的N,N二甲基甲酰胺中加入6mg氧化石墨烯，再超声破碎分散60min，制得2mg/mL的氧化石墨烯分散液。(1) Add 6 mg of graphene oxide into 3 mL of N,N dimethylformamide, and then ultrasonically crush and disperse for 60 min to prepare a 2 mg/mL graphene oxide dispersion.
(2)将0.45g的聚丙烯腈加入到氧化石墨烯的分散液中，在室温下，180r/min，磁力搅拌10～15h，制得静电纺丝液。(2) Add 0.45 g of polyacrylonitrile into the graphene oxide dispersion liquid, and stir it magnetically at 180 r/min for 10-15 h at room temperature to prepare an electrospinning liquid.
(3)将聚丙烯腈纺丝溶液静置6小时以除去溶液中的气泡，进行电纺，静电纺丝接收基材为铝箔纸。电纺参数：金属内径为0.51mm，在15kV的电压下，接收距离为10cm，以1.4mL/h的推进速度进行电纺，得到氧化石墨烯/聚丙烯腈纳米纤维膜。(3) The polyacrylonitrile spinning solution was left to stand for 6 hours to remove air bubbles in the solution, and electrospinning was performed, and the receiving substrate of the electrospinning was aluminum foil paper. Electrospinning parameters: the inner diameter of the metal is 0.51mm, the receiving distance is 10cm at a voltage of 15kV, and the electrospinning is performed at a propulsion speed of 1.4mL/h to obtain a graphene oxide/polyacrylonitrile nanofiber membrane.
(4)将质量比为7:3的0.0878g的壳聚糖和0.0376g的聚氧化乙烯加入到4.4mL的50％甲酸溶液中，在室温下，300r/min，磁力搅拌10～15h，制得壳聚糖静电纺丝液。(4) Add 0.0878g of chitosan and 0.0376g of polyethylene oxide with a mass ratio of 7:3 to 4.4mL of 50% formic acid solution, at room temperature, 300r/min, magnetic stirring for 10-15h, prepared To obtain chitosan electrospinning solution.
(5)将壳聚糖纺丝溶液静置3小时以除去溶液中的气泡，进行电纺，静电纺丝接收基材为聚丙烯腈纳米纤维膜。电纺参数：金属针内径为0.33mm，在16.5kV的电压下，接收距离为10cm，以0.3mL/h的推进速度进行电纺。(5) The chitosan spinning solution was left to stand for 3 hours to remove air bubbles in the solution, and electrospinning was performed, and the receiving substrate of the electrospinning was a polyacrylonitrile nanofiber membrane. Electrospinning parameters: the inner diameter of the metal needle is 0.33mm, the receiving distance is 10cm under the voltage of 16.5kV, and the electrospinning is performed at the advancing speed of 0.3mL/h.
(6)制备的纳米纤维膜在50℃干燥箱中烘干即得到一种壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜。(6) The prepared nanofiber membrane was dried in a drying oven at 50° C. to obtain a chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane.
实施例3Example 3
(1)在3mL的N,N二甲基甲酰胺中加入9mg氧化石墨烯，再超声破碎分散60min，制得3mg/mL的氧化石墨烯分散液。(1) Add 9 mg of graphene oxide into 3 mL of N,N dimethylformamide, and then ultrasonically crush and disperse for 60 min to prepare a 3 mg/mL graphene oxide dispersion.
(2)将0.45g的聚丙烯腈加入到氧化石墨烯的分散液中，在室温下，180r/min，磁力搅拌10～15h，制得静电纺丝液。(2) Add 0.45 g of polyacrylonitrile into the graphene oxide dispersion liquid, and stir it magnetically at 180 r/min for 10-15 h at room temperature to prepare an electrospinning liquid.
(3)将聚丙烯腈纺丝溶液静置6小时以除去溶液中的气泡，进行电纺，静电纺丝接收基材为铝箔纸。电纺参数：金属内径为0.51mm，在15kV的电压下，接收距离为10cm，以1.4mL/h的推进速度进行电纺，得到氧化石墨烯/聚丙烯腈纳米纤维膜，其扫描电镜如图1(A)所示。(3) The polyacrylonitrile spinning solution was left to stand for 6 hours to remove air bubbles in the solution, and electrospinning was performed, and the receiving substrate of the electrospinning was aluminum foil paper. Electrospinning parameters: the inner diameter of the metal is 0.51mm, the receiving distance is 10cm at a voltage of 15kV, and the electrospinning is performed at a propulsion speed of 1.4mL/h to obtain a graphene oxide/polyacrylonitrile nanofiber membrane. The scanning electron microscope is shown in the figure 1(A).
(4)将质量比为8:2的0.0878g的壳聚糖和0.0221g的聚氧化乙烯加入到4.4mL的50％甲酸溶液中，在室温下，300r/min，磁力搅拌10～15h，制得壳聚糖静电纺丝液。(4) Add 0.0878g of chitosan and 0.0221g of polyethylene oxide with a mass ratio of 8:2 to 4.4mL of 50% formic acid solution, at room temperature, 300r/min, magnetic stirring for 10-15h, prepared To obtain chitosan electrospinning solution.
(5)将壳聚糖纺丝溶液静置3小时以除去溶液中的气泡，进行电纺，静电纺丝接收基材为聚丙烯腈纳米纤维膜。电纺参数：金属针内径为0.33mm，在16.5kV的电压下，接收距离为10cm，以0.3mL/h的推进速度进行电纺，其壳聚糖纳米纤维扫描电镜如图1(B)所示。(5) The chitosan spinning solution was left to stand for 3 hours to remove air bubbles in the solution, and electrospinning was performed, and the receiving substrate of the electrospinning was a polyacrylonitrile nanofiber membrane. Electrospinning parameters: the inner diameter of the metal needle is 0.33mm, the receiving distance is 10cm under the voltage of 16.5kV, and the electrospinning is carried out at the advancing speed of 0.3mL/h. The chitosan nanofiber scanning electron microscope is shown in Figure 1(B). Show.
(6)制备的纳米纤维膜在50℃干燥箱中烘干即得到一种壳聚糖-氧化石墨烯/聚丙烯腈双层纳米纤维膜。(6) The prepared nanofiber membrane was dried in a drying oven at 50° C. to obtain a chitosan-graphene oxide/polyacrylonitrile double-layer nanofiber membrane.
对比例comparative example
本对比例与实施例1基本相同，唯一不同的地方为氧化石墨烯分散液的浓度为0mg/mL，得到壳聚糖-聚丙烯腈纳米纤维膜，其扫描电镜如图1(C)所示。This comparative example is basically the same as Example 1, and the only difference is that the concentration of the graphene oxide dispersion is 0 mg/mL to obtain a chitosan-polyacrylonitrile nanofiber membrane, as shown in Figure 1(C) in a scanning electron microscope .
表1各纳米纤维膜的机械性能Table 1 Mechanical properties of each nanofibrous membrane
表1为各纳米纤维膜的机械性能结果。壳聚糖纳米纤维的机械性能数据参考文献(Makaremi M,et al.Electrospun functionalized polyacrylonitrile–chitosan Bi-layer membranes for water filtration applications[J].RSC Advances,2016,6(59):53882-53893.)。从表1可以看出，添加壳聚糖层(即在不存在氧化石墨烯的情况下)明显地将聚丙烯腈膜的抗拉强度和弹性模量提高了74％和32％。氧化石墨烯的掺入使得聚丙烯腈机械性能下降。在聚丙烯腈膜表面电纺一层壳聚糖纤维膜时，随着壳聚糖纳米纤维在聚丙烯腈纳米纤维表面逐渐干燥，壳聚糖纳米纤维与聚丙烯腈产生强烈的物理附着作用，同时壳聚糖分子链中的羟基会与氧化石墨烯中的羟基、羧基形成氢键，二者相互结合使得膜机械性能提高。Table 1 shows the results of mechanical properties of each nanofiber membrane. Mechanical property data references of chitosan nanofibers (Makaremi M, et al. Electrospun functionalized polyacrylonitrile–chitosan Bi-layer membranes for water filtration applications[J].RSC Advances,2016,6(59):53882-53893.) . As can be seen from Table 1, the addition of a chitosan layer (ie in the absence of graphene oxide) clearly increased the tensile strength and elastic modulus of the polyacrylonitrile film by 74% and 32%. The incorporation of graphene oxide degrades the mechanical properties of polyacrylonitrile. When a layer of chitosan fiber membrane is electrospun on the surface of the polyacrylonitrile membrane, as the chitosan nanofibers gradually dry on the surface of the polyacrylonitrile nanofibers, the chitosan nanofibers and polyacrylonitrile have a strong physical adhesion, At the same time, the hydroxyl groups in the chitosan molecular chain will form hydrogen bonds with the hydroxyl groups and carboxyl groups in the graphene oxide, and the combination of the two will improve the mechanical properties of the film.
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