CN111905816A - ZIF-8 functional fabric and preparation method thereof - Google Patents
ZIF-8 functional fabric and preparation method thereof Download PDFInfo
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- 239000004744 fabric Substances 0.000 title claims abstract description 85
- 239000013154 zeolitic imidazolate framework-8 Substances 0.000 title claims abstract description 57
- MFLKDEMTKSVIBK-UHFFFAOYSA-N zinc;2-methylimidazol-3-ide Chemical compound [Zn+2].CC1=NC=C[N-]1.CC1=NC=C[N-]1 MFLKDEMTKSVIBK-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229960003638 dopamine Drugs 0.000 claims abstract description 43
- 239000011701 zinc Substances 0.000 claims abstract description 22
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 20
- 230000004913 activation Effects 0.000 claims abstract description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 48
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 42
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 38
- 239000011592 zinc chloride Substances 0.000 claims description 19
- 235000005074 zinc chloride Nutrition 0.000 claims description 19
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000007853 buffer solution Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000004280 Sodium formate Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims description 7
- 235000019254 sodium formate Nutrition 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 230000003213 activating effect Effects 0.000 claims description 6
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 claims description 5
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 3
- 239000007983 Tris buffer Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 239000004809 Teflon Substances 0.000 claims 1
- 229920006362 Teflon® Polymers 0.000 claims 1
- 238000007654 immersion Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 13
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 abstract description 9
- 229920001690 polydopamine Polymers 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 125000000524 functional group Chemical group 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 230000009920 chelation Effects 0.000 abstract 1
- 239000000975 dye Substances 0.000 description 19
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 12
- 229960000907 methylthioninium chloride Drugs 0.000 description 12
- 238000002835 absorbance Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 238000005286 illumination Methods 0.000 description 5
- 230000001699 photocatalysis Effects 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 230000000593 degrading effect Effects 0.000 description 4
- 238000004043 dyeing Methods 0.000 description 4
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- LWXNQQIVUUSCSL-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol trihydrochloride Chemical compound Cl.Cl.Cl.OCC(N)(CO)CO LWXNQQIVUUSCSL-UHFFFAOYSA-N 0.000 description 3
- SLCITEBLLYNBTQ-UHFFFAOYSA-N CO.CC=1NC=CN1 Chemical compound CO.CC=1NC=CN1 SLCITEBLLYNBTQ-UHFFFAOYSA-N 0.000 description 3
- 239000001045 blue dye Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000011941 photocatalyst Substances 0.000 description 3
- 150000003751 zinc Chemical class 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000002336 sorption--desorption measurement Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
- B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
- B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
- B01J31/1815—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine with more than one complexing nitrogen atom, e.g. bipyridyl, 2-aminopyridine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/20—Complexes comprising metals of Group II (IIA or IIB) as the central metal
- B01J2531/26—Zinc
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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
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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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
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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Abstract
The invention relates to a preparation method of a ZIF-8 functional fabric, which comprises the following steps: 1) preparing a zinc ion-dopamine fabric; 2) activation of zinc ion-dopamine fabric; 3) growth of ZIF-8 membrane fabric. The invention aims to introduce a polydopamine layer on the surface of a fabric, and induce a ZIF-8 film to uniformly grow on the surface of the fabric through the chelation of polydopamine active functional groups and zinc ions. The polydopamine coating not only enhances the binding force between the fibers and the ZIF-8 membrane, but also induces zinc ions to be gathered on the surfaces of the fibers, thereby promoting the uniform growth of ZIF-8 crystals on the surfaces of the fibers.
Description
Technical Field
The invention relates to the technical field of functional fabrics, in particular to a ZIF-8 functional fabric and a preparation method thereof.
Background
In recent years, with the rise and development of the printing and dyeing industry, printing and dyeing wastewater becomes a main environmental pollution source. Due to the wide variety of dyes and complex components, printing and dyeing wastewater becomes a prominent problem in environmental management. The conventional methods for treating printing and dyeing wastewater comprise a physical method, a chemical method, a biodegradation method and a photocatalytic method. The photocatalytic degradation as an environment-friendly new technology has the advantages of no toxicity, low energy consumption, simple and convenient operation, mild reaction conditions, wide application range, capability of effectively removing organic pollutants in wastewater and the like, and has great advantages in dye sewage treatment. However, the difficulty of recovering and recycling the catalyst has hindered further commercialization of photocatalytic technology.
The fabric has the structural characteristic of looseness and porosity, is widely applied to a photocatalyst-loaded template, and solves the problem that the powder photocatalyst is difficult to recover. The common method is to load the photocatalyst on the surface of the fabric through a hydrothermal growth method, so that the fabric is endowed with good photocatalytic degradation performance and easy recycling property. Since deprotonated 2-methylimidazole and zinc ions rapidly nucleate in solution, ZIF-8 precipitates are generated in the solution, and thus ZIF-8 growth on the surface of the fabric is inhibited.
By introducing polydopamine to the surface of the fiber, the catechol and the amino functional group of the polydopamine can be utilized to react with Zn2+Chelating to form Zn on the surface of fibre2+The complex, as a zinc source, induces the growth of ZIF-8 on the fiber surface. This method allows uniform growth of ZIF-8 on the fiber surface because of Zn2+The method is characterized in that deprotonated 2-methylimidazole is induced to aggregate on the surface of the fiber, so that ZIF-8 grows on the surface of the fiber, and the binding force of the ZIF-8 and the surface of the fiber can be improved due to the strong adhesion of polydopamine. Through the dopamine-induced ZIF-8 in-situ growth on the fabric substrate, the dye in the wastewater can be effectively removed, the problem of recycling can be solved, and the method has an industrial application prospect.
Disclosure of Invention
Aiming at solving the defects of weak interface acting force and poor stability between the ZIF-8 crystal and a carrier; the invention aims to solve the defects that the nucleation sites on the surface of the fabric are few and crystals are difficult to grow on the surface of the fabric, and the invention aims to provide a scheme for preparing the ZIF-8 functional cotton fabric by introducing a zinc ion-dopamine layer on the surface of the fabric and activating the 2-methylimidazole. The polydopamine coating not only enhances the binding force between the fibers and the ZIF-8 membrane, but also induces zinc ions to be gathered on the surfaces of the fibers, thereby promoting the uniform growth of ZIF-8 crystals on the surfaces of the fibers.
In order to achieve the purpose, the technical scheme of the invention is as follows: a preparation method of ZIF-8 functional fabric comprises the following steps:
1) preparation of zinc ion-dopamine fabric: adding dopamine and zinc chloride into a Tris-HCl buffer solution, and then soaking the fabric in the dopamine and zinc chloride to obtain a zinc ion-dopamine fabric;
2) activation of zinc ion-dopamine fabric: activating the zinc ion-dopamine fabric obtained in the step 1) in a methanol solution of 2-methylimidazole;
3) preparing ZIF-8 functional fabric: preparing ZIF-8 synthetic solution from zinc chloride, sodium formate, 2-methylimidazole and methanol, immersing the zinc ion-dopamine fabric activated in the step 2) in the solution for reaction, and washing and drying to obtain the ZIF-8 functional fabric.
On the basis of the technical scheme, the invention can be further improved as follows.
Specifically, in the step 1), the Tris-HCl buffer solution is prepared at room temperature, wherein the concentration of Tris is 10mM, and the pH is adjusted to 8.5 +/-0.2 by NaOH. In the step 1), the concentration of the dopamine is 1-5g/L, the concentration of the zinc chloride is 1-5g/L, and the dipping condition is that the vibration is carried out for 1-48 h at room temperature. The above operation can convert Zn into2+Doped into a dopamine solution and then the fabric is immersed in the dopamine solution. Wherein the Tris-HCl buffer solution is a buffer solution formed by mixing Tris (hydroxymethyl) aminomethane and hydrochloric acid.
Specifically, in the step 2), the concentration of the methanol solution of the 2-methylimidazole is 5M, and the activation condition is that the 2-methylimidazole is activated for 2h-2.5h at the temperature of 50-60 ℃.
Specifically, in the step 3), the molar ratio of the zinc chloride to the sodium formate to the 2-methylimidazole to the methanol is 1:1:2: 313.
Specifically, in the step 4), the reaction is carried out in a polytetrafluoroethylene reaction kettle, the reaction is carried out under the reaction condition of 85 ℃ for 24 hours, the washing is carried out for 2-3 times by adopting methanol, and the drying is carried out at 60 ℃.
In addition, the invention also provides a ZIF-8 functional fabric which is prepared by adopting the preparation method of the ZIF-8 functional fabric.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a low magnification SEM image of a ZIF-8 functional fabric provided by the present invention;
FIG. 2 is a high magnification SEM image of a ZIF-8 functional fabric provided by the present invention;
FIG. 3 shows the efficiency of degrading methylene blue dye for a ZIF-8 functional fabric provided by the present invention;
FIG. 4 shows the efficiency of three-time degradation of methylene blue dye by recycling a ZIF-8 functional fabric provided by the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the accompanying fig. 1-4, which are provided by way of example only to illustrate the present invention and not to limit the scope of the present invention.
Example 1: preparation of ZIF-8 functional fabrics
(1) Preparation of zinc ion-dopamine fabric: preparing 10mM Tris-hydroxymethyl aminomethane (Tris-HCl) buffer solution at room temperature, and adjusting the pH value to 8.5 by using NaOH; taking a proper amount of the buffer solution, and dissolvingQuantitative dopamine and zinc chloride (dopamine concentration of 2g/L and zinc chloride concentration of 4g/L), and adding Zn2+Doped into the dopamine solution, and then the fabric is immersed in the dopamine solution and shaken for 24h at room temperature.
(2) Activation of zinc ion-dopamine fabric: immersing the fabric treated in the step (1) in the same volume of 5M 2-methylimidazole methanol solution, and activating for 2h at 50 ℃.
(3) Preparing ZIF-8 functional fabric: 0.538g of zinc chloride (ZnCl)2) 0.258g of sodium formate (NaCOOH), 0.648g of 2-methylimidazole and 50ml of methanol (CH)3OH), transferring the synthesized solution into a polytetrafluoroethylene reaction kettle, immersing the activated zinc ion-dopamine fabric obtained in the step (2) into the solution, reacting for 24 hours at 85 ℃, washing for 2-3 times by using methanol, and drying for 5 hours at 60 ℃ to obtain the ZIF-8 functional fabric.
Example 2: preparation of ZIF-8 functional fabrics
(1) Preparation of zinc ion-dopamine fabric: preparing 10mM Tris-hydroxymethyl aminomethane (Tris-HCl) buffer solution at room temperature, and adjusting the pH value to 8.4 by using NaOH; taking appropriate amount of above buffer solution, dissolving certain amount of dopamine and zinc chloride (dopamine concentration is 2.1g/L, zinc chloride concentration is 4.1g/L) simultaneously, and adding Zn2+Doped into the dopamine solution, and then the fabric is immersed in the dopamine solution and shaken for 24h at room temperature.
(2) Activation of zinc ion-dopamine fabric: immersing the fabric treated in the step (1) in the same volume of 5M 2-methylimidazole methanol solution, and activating at 60 ℃ for 2.5 h.
(3) Preparing ZIF-8 functional fabric: 0.7532g of zinc chloride (ZnCl)2) 0.3612g sodium formate (NaCOOH), 0.9072g 2-methylimidazole and 70ml methanol (CH)3OH), transferring the synthesized solution into a polytetrafluoroethylene reaction kettle, immersing the activated zinc ion-dopamine fabric obtained in the step (2) into the solution, reacting for 22h at 85 ℃, washing for 3 times by using methanol, and drying for 6h at 60 ℃ to obtain the ZIF-8 functional fabric.
Example 3: preparation of ZIF-8 functional fabrics
(1) Zinc ion-Preparation of dopamine fabric: preparing 10mM Tris-hydroxymethyl aminomethane (Tris-HCl) buffer solution at room temperature, and adjusting the pH value to 8.7 by using NaOH; taking appropriate amount of above buffer solution, dissolving certain amount of dopamine and zinc chloride (dopamine concentration is 1.8g/L, zinc chloride concentration is 3.9g/L) simultaneously, and adding Zn2+Doped into the dopamine solution, and then the fabric is immersed in the dopamine solution and shaken at room temperature for 22 h.
(2) Activation of zinc ion-dopamine fabric: immersing the fabric treated in the step (1) in the same volume of 5M 2-methylimidazole methanol solution, and activating at 50 ℃ for 2.5 h.
(3) Preparing ZIF-8 functional fabric: 0.9684g of zinc chloride (ZnCl)2) 0.4644g sodium formate (NaCOOH), 1.1664g 2-methylimidazole in 50ml methanol (CH)3OH), transferring the synthesized solution into a polytetrafluoroethylene reaction kettle, immersing the activated zinc ion-dopamine fabric obtained in the step (2) into the solution, reacting for 22 hours at 85 ℃, washing for 2 times by using methanol, and drying at 60 ℃ to obtain the ZIF-8 functional fabric.
Example 4: photocatalytic degradation of methylene blue by ZIF-8 functional fabric
The photocatalytic performance of the ZIF-8 functional fabric obtained by the method is characterized by degrading dye Methylene Blue (MB) under the full-light irradiation condition. 0.5g of ZIF-8 functional fabric was added to a glass reaction vessel, followed by 100mL of dye solution, with an initial concentration of dye methylene blue of 10 mg/L. Stirring for 30min in the dark before illumination, and turning on a CEL-HXUV300 xenon lamp light source to perform photocatalytic reaction after the catalyst and the dye reach adsorption-desorption equilibrium. Sampling every 20min after illumination, measuring the absorbance of the residual dye in the solution by using a SPECORD @210PLUS type ultraviolet-visible spectrophotometer, and then calculating the degradation rate of the dye according to the change of the absorbance of the solution. Wherein the resulting efficiency of degrading methylene blue dye is shown in figure 3.
Percent degradation (%) - (C)0-Ct)/Ct＝(A0-At)/At
C0: initial concentration of dye solution; ctFor illuminating dye solutions at time tConcentration; a. the0Initial absorbance of the dye solution, AtAbsorbance of the dye solution at time t after illumination;
example 5: recycling stability of ZIF-8 functional fabrics
Taking the ZIF-8 functional cotton fabric subjected to photocatalytic degradation on methylene blue out of the dye solution, drying the fabric in an oven at 60 ℃, and then adding the fabric into 100mL of the dye solution, wherein the initial concentration of the dye methylene blue is 10 mg/L. Stirring for 30min in the dark before illumination, and turning on a CEL-HXUV300 xenon lamp light source to perform photocatalytic reaction after the catalyst and the dye reach adsorption-desorption equilibrium. Sampling every 20min after illumination, measuring the absorbance of the residual dye in the solution by using a SPECORD @210PLUS type ultraviolet-visible spectrophotometer, and then calculating the degradation rate of the dye according to the change of the absorbance of the solution. Repeating the steps for three times to obtain the recycling stability of the ZIF-8 functional fabric. The results are shown in FIG. 4.
The experiments of examples 4 and 5 show that: the photocatalytic activity of ZIF-8 functional fabrics was evaluated by degrading Methylene Blue (MB) under full light exposure, with results shown in figure 3: when the irradiation time reaches 190min, the absorbance of the methylene blue solution has no obvious absorption peak, and the degradation rate of methylene is 92.6%. After three times of cycle tests, the results are shown in figure 4, the photocatalytic activity of the ZIF-8 functional fabric is only slightly degraded, and the degradation rate reaches 90.7% within 190 min.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (7)
1. A preparation method of ZIF-8 functional fabric is characterized by comprising the following steps: the method comprises the following steps:
1) preparation of zinc ion-dopamine fabric: adding dopamine and zinc chloride into a Tris-HCl buffer solution, and then soaking the fabric in the dopamine and zinc chloride to obtain a zinc ion-dopamine fabric;
2) activation of zinc ion-dopamine fabric: activating the zinc ion-dopamine fabric obtained in the step 2) in a methanol solution of 2-methylimidazole;
3) preparing ZIF-8 functional fabric: preparing ZIF-8 synthetic solution from zinc chloride, sodium formate, 2-methylimidazole and methanol, immersing the zinc ion-dopamine fabric activated in the step 3) in the solution for reaction, and washing and drying to obtain the ZIF-8 functional fabric.
2. The method of manufacturing ZIF-8 functional fabric according to claim 1, wherein, in step 1), the Tris-HCl buffer solution is prepared at room temperature, wherein the Tris concentration is 10mM, and the pH is adjusted to 8.5 ± 0.2 with NaOH.
3. The method of manufacturing ZIF-8 functional fabric according to claim 1, wherein in step 1), the dopamine concentration is 1.0 to 5g/L, the zinc chloride concentration is 1.0 to 5g/L, and the immersion is performed under room temperature shaking for 1 to 48 hours.
4. The method of manufacturing ZIF-8 functional fabrics according to any of claims 1-3, wherein in step 2), the concentration of the methanol solution of 2-methylimidazole is 5M, and the activation condition is 50 ℃ to 60 ℃ for 1h to 5 h.
5. The method of manufacturing ZIF-8 functional fabric according to claim 5, wherein in step 3), the molar ratio of the zinc chloride, sodium formate, 2-methylimidazole and methanol is 1:1:2: 313.
6. The method of manufacturing ZIF-8 functional fabrics according to claim 6, wherein in step 3), the reaction is performed in a teflon reaction vessel, the reaction conditions are 85 ℃ for 24h, the washing is performed 2-3 times with methanol, and the obtained sample is dried in an oven at 60 ℃.
7. A ZIF-8 functional fabric characterized by being prepared by the method of preparing a ZIF-8 functional fabric according to any one of claims 1 to 7.
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