CN110327888B - Difunctional sulfhydryl Schiff base metal organogel-nanocomposite material and preparation method and application thereof - Google Patents
Difunctional sulfhydryl Schiff base metal organogel-nanocomposite material and preparation method and application thereof Download PDFInfo
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- CN110327888B CN110327888B CN201910598058.3A CN201910598058A CN110327888B CN 110327888 B CN110327888 B CN 110327888B CN 201910598058 A CN201910598058 A CN 201910598058A CN 110327888 B CN110327888 B CN 110327888B
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- 239000002184 metal Substances 0.000 title claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- -1 sulfhydryl Schiff base Chemical class 0.000 title claims abstract description 17
- 239000002262 Schiff base Substances 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 title abstract description 21
- 239000002904 solvent Substances 0.000 claims abstract description 28
- 230000001588 bifunctional effect Effects 0.000 claims abstract description 21
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000002378 acidificating effect Effects 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 6
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- 238000000034 method Methods 0.000 claims description 19
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- RZUBARUFLYGOGC-MTHOTQAESA-L acid fuchsin Chemical compound [Na+].[Na+].[O-]S(=O)(=O)C1=C(N)C(C)=CC(C(=C\2C=C(C(=[NH2+])C=C/2)S([O-])(=O)=O)\C=2C=C(C(N)=CC=2)S([O-])(=O)=O)=C1 RZUBARUFLYGOGC-MTHOTQAESA-L 0.000 claims description 11
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- QBZIEGUIYWGBMY-FUZXWUMZSA-N (5Z)-5-hydroxyimino-6-oxonaphthalene-2-sulfonic acid iron Chemical compound [Fe].O\N=C1/C(=O)C=Cc2cc(ccc12)S(O)(=O)=O.O\N=C1/C(=O)C=Cc2cc(ccc12)S(O)(=O)=O.O\N=C1/C(=O)C=Cc2cc(ccc12)S(O)(=O)=O QBZIEGUIYWGBMY-FUZXWUMZSA-N 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 10
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- 238000002835 absorbance Methods 0.000 description 8
- IQFVPQOLBLOTPF-HKXUKFGYSA-L congo red Chemical compound [Na+].[Na+].C1=CC=CC2=C(N)C(/N=N/C3=CC=C(C=C3)C3=CC=C(C=C3)/N=N/C3=C(C4=CC=CC=C4C(=C3)S([O-])(=O)=O)N)=CC(S([O-])(=O)=O)=C21 IQFVPQOLBLOTPF-HKXUKFGYSA-L 0.000 description 8
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- GDGIVSREGUOIJZ-UHFFFAOYSA-N 5-amino-3h-1,3,4-thiadiazole-2-thione Chemical compound NC1=NN=C(S)S1 GDGIVSREGUOIJZ-UHFFFAOYSA-N 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 2
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- 239000001888 Peptone Substances 0.000 description 2
- 108010080698 Peptones Proteins 0.000 description 2
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- JMXROTHPANUTOJ-UHFFFAOYSA-H naphthol green b Chemical compound [Na+].[Na+].[Na+].[Fe+3].C1=C(S([O-])(=O)=O)C=CC2=C(N=O)C([O-])=CC=C21.C1=C(S([O-])(=O)=O)C=CC2=C(N=O)C([O-])=CC=C21.C1=C(S([O-])(=O)=O)C=CC2=C(N=O)C([O-])=CC=C21 JMXROTHPANUTOJ-UHFFFAOYSA-H 0.000 description 1
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N55/00—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur
- A01N55/02—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur containing metal atoms
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/223—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material containing metals, e.g. organo-metallic compounds, coordination complexes
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Abstract
The invention discloses a bifunctional sulfhydryl Schiff base metal organic gel-nano composite material and a preparation method and application thereof, the bifunctional sulfhydryl Schiff base metal organic gel-nano composite material AgNPs @ Ag (I) -MTMP contains silver nanoparticles AgNPs, Ag (I) -MTMP and a solvent, the AgNPs are adsorbed on the Ag (I) -MTMP, and the Ag (I) -MTMP wraps the solvent by hydrogen bonds and molecular acting force; the chemical formula of Ag (I) -MTMP is [ Ag (MTMP ]]n(L)n，[Ag(MTMP)]n n+The structure of (A) is shown as a formula I, wherein L is a negative monovalent anion, n is a positive integer, and MTMP is 2- ((5-mercapto-1, 3, 4-thiadiazole-2-imino) methyl) phenol; the double composite material can efficiently adsorb and remove acidic organic dye molecules and has an antibacterial function;
Description
Technical Field
The invention relates to an organic gel-nano composite material, in particular to a bifunctional sulfhydryl Schiff base metal organic gel-nano composite material and a preparation method and application thereof.
Background
It is well known that water is the most important component of life on earth. With the development of modern society, the world population geometrically increases, and the demand for clean water greatly increases. However, industrial mass production and agricultural activities generate a large amount of wastewater, cause serious environmental water pollution, and cause continuous deterioration of water quality, and face serious water resource shortage problems all over the world.
The organic dye is widely applied to industries such as textile, leather, tanning, paper making, food processing, plastics, cosmetics, rubber, printing and the like, and is a main pollutant of industrial wastewater. Carcinogenic substances produced by dyes during degradation pose hazards to the ecosystem and human life. Therefore, the effective removal of organic dye pollutants in water is of great significance to environmental protection and human health.
The organic dye is chemically stable and difficult to degrade. Various methods for removing dye contamination have been used including flocculation, electrochemical treatment, adsorption, membrane separation, and the like. Among the above methods, the adsorption method has high adsorption efficiency, high recovery rate, and low cost, and is widely used. The currently used adsorbents include starch/polyaniline, porous silicon, guar gum, activated carbon, Metal Organic Frameworks (MOFs), inorganic hollow spheres and the like. However, these conventional adsorbents also have many disadvantages, including poor removal of many hydrophilic contaminants, too low adsorption capacity for macromolecular stabilizing contaminants, long time for physical activation, thorough cleaning for chemical activation, etc.
Disclosure of Invention
The invention aims to provide a bifunctional sulfhydryl schiff base metal organic gel-nano composite material, a preparation method and application thereof.
In order to realize the aim, the invention provides a bifunctional sulfhydryl Schiff base metal organic gel-nano composite materialAgNPs @ Ag (I) -MTMP containing silver nanoparticles AgNPs, Ag (I) -MTMP and a solvent, wherein the AgNPs are adsorbed on the Ag (I) -MTMP, and the Ag (I) -MTMP wraps the solvent through hydrogen bond and molecular force; the chemical formula of Ag (I) -MTMP is [ Ag (MTMP ]]n(L)n，[Ag(MTMP)]n n+The structure of (A) is shown as a formula I, wherein L is a negative monovalent anion, n is a positive integer, and MTMP is 2- ((5-mercapto-1, 3, 4-thiadiazole-2-imino) methyl) phenol;
the invention also provides a preparation method of the bifunctional thiol Schiff base metal organogel-nanocomposite AgNPs @ Ag (I) -MTMP, which comprises the following steps: the silver salt AgL and the MTMP are put into a solvent to be mixed, the contact reaction is carried out after the pH value is adjusted, and then the mixture is stood and dried to obtain AgNPs @ Ag (I) -MTMP.
The invention further provides an application of the bifunctional sulfhydryl Schiff base metal organogel-nanocomposite AgNPs @ Ag (I) -MTMP in adsorption of acidic organic dyes in water and/or sterilization of water.
According to the technical scheme, the AgNPs @ Ag (I) -MTMP metal organic gel-nano composite material is synthesized by reacting the Schiff base MTMP containing sulfydryl with silver salt in a solvent through an in-situ synthesis method, and the metal organic gel has the advantages of high porosity, large specific surface area and the like, so that the metal organic gel has a good adsorption effect; silver nanoparticles can be formed in situ in the gel matrix through silver salt to form the metal organic gel-nano composite material, so that the material has antibacterial performance. Meanwhile, the preparation method is simple to operate and high in yield, and the problem that the dye is difficult to degrade is solved.
Experiments show that the material has very good performance in adsorbing and removing acid dyes such as naphthol green B (NG), Acid Fuchsin (AF), Congo Red (CR), Methyl Orange (MO) and the like in an aqueous solution. Adsorption of the dye followed the pseudo-first order kinetic process and the Freundlich isothermal adsorption model, indicating that chemisorption was performed. In addition, the composite material has good antibacterial performance on escherichia coli, bacillus subtilis and staphylococcus aureus. Therefore, the obtained material has dual functions of adsorption and antibiosis, can solve two problems at one time in the process of environmental water treatment, and provides reference for obtaining the field direct drinking water treatment material.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings: in FIGS. 2 to 5, a is AgNO as raw material3B the raw material is AgClO4。
FIG. 1 is a schematic diagram of the synthesis of AgNPs @ Ag (I) -MTMP in example 1;
FIG. 2-1 is an SEM photograph of AgNPs @ Ag (I) -MTMP in example 1;
FIG. 2-2 is an SEM photograph of AgNPs @ Ag (I) -MTMP in example 4;
FIG. 3-1 is a TEM image of AgNPs @ Ag (I) -MTMP in example 1;
FIG. 3-2 is a TEM image of AgNPs @ Ag (I) -MTMP in example 4;
FIG. 4-1 is the XRD pattern of AgNPs @ Ag (I) -MTMP in example 1;
FIG. 4-2 is the XRD pattern of AgNPs @ Ag (I) -MTMP in example 4;
FIG. 5-1 is a BET plot of AgNPs @ Ag (I) -MTMP in example 1;
FIG. 5-2 is a BET plot of AgNPs @ Ag (I) -MTMP in example 4;
FIG. 6 is a statistical plot of absorbance of the adsorption dye naphthol green of AgNPs @ Ag (I) -MTMP in example 1;
FIG. 7 is a statistical plot of absorbance of Congo red, an adsorption dye for AgNPs @ Ag (I) -MTMP in example 1;
FIG. 8 is a statistical plot of the absorbance of the dye methyl orange adsorbed by AgNPs @ Ag (I) -MTMP in example 1;
FIG. 9 is a statistical plot of the absorbance of the dye acid fuchsin adsorbed by AgNPs @ Ag (I) -MTMP in example 1;
FIG. 10 is the saturation adsorption amounts of AgNPs @ Ag (I) -MTMP for four dyes in example 1;
FIG. 11 is a graph of the adsorption efficiency of AgNPs @ Ag (I) -MTMP versus four dyes as a function of time for example 1;
FIG. 12 is a graph showing the antibacterial effect of AgNPs @ Ag (I) -MTMP in example 1.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a bifunctional sulfhydryl Schiff base metal organic gel-nano composite material AgNPs @ Ag (I) -MTMP, the AgNPs @ Ag (I) -MTMP contains silver nanoparticles AgNPs, Ag (I) -MTMP and a solvent, the AgNPs are adsorbed on the Ag (I) -MTMP, and the Ag (I) -MTMP wraps the solvent by hydrogen bonds and molecular acting force; the chemical formula of Ag (I) -MTMP is [ Ag (MTMP ]]n(L)n，[Ag(MTMP)]n n+The structure of (A) is shown as a formula I, wherein L is a negative monovalent anion, n is a positive integer, and MTMP is 2- ((5-mercapto-1, 3, 4-thiadiazole-2-imino) methyl) phenol;
in the above bifunctional mercaptoschiff base metal organogel-nanocomposite, the specific structure of the bifunctional mercaptoschiff base metal organogel-nanocomposite can be selected within a wide range, and in order to further improve the adsorption and antibacterial effects of the organogel-nanocomposite, the ag (i) — MTMP is preferably a linear fiber structure.
In the above bifunctional mercaptoschiff base metal organogel-nanocomposite, a specific kind of L may be selected from a wide range, and in order to further improve the efficiency of in-situ reduction of silver ions and further improve the antibacterial effect of the composite, preferably, L is selected from at least one of nitrate and perchlorate.
In the above bifunctional mercaptoschiff base metal organogel-nanocomposite, the specific type of the solvent can be selected within a wide range, and in order to further improve the efficiency of in-situ reduction of silver ions and further improve the antibacterial effect of the composite, the solvent is preferably selected from CH3OH、CH3CH2OH、DMSO/H2O mixed solution, DMF/H2At least one of O mixed solution; more preferably, the solvent is DMF, H2And (3) mixed solution of O.
The invention also provides a preparation method of the bifunctional thiol Schiff base metal organogel-nanocomposite AgNPs @ Ag (I) -MTMP, which comprises the following steps: the silver salt AgL and the MTMP are put into a solvent to be mixed, the contact reaction is carried out after the pH value is adjusted, and then the mixture is stood and dried to obtain AgNPs @ Ag (I) -MTMP.
In the above preparation method, one-dimensional linear structures formed by Ag (I) -MTMP coordination polymer are stacked up to react with solvents DMF and H by hydrogen bond and molecular force2O and the like, and the mixed solvent is wrapped to form metal organogel; the excess silver salt, after heat treatment, can form silver nanoparticles in situ attached to the linear fiber network formed by the ag (i) -MTMP coordination polymer. The one-dimensional linear polymer fibers are stacked to form a space, so that the obtained material has strong adsorption capacity.
In the above production method, the molar ratio of silver salt to MTMP can be selected within a wide range, but in order to further improve the adsorption and antibacterial effects of AgNPs @ ag (i) -MTMP, it is preferable that the molar ratio of silver salt to MTMP is 0.6 to 1.2: 1.0; when AgNO3When the/MTMP is between 1.2 and 0.6, Ag (I) -MTMP metal organogel can be formed, and when the/MTMP metal organogel is more than 1.2 or less than 0.6, the gel cannot be effectively formed.
In the above production method, the amount of the solvent to be used may be selected within a wide range, but in order to further improve the reaction efficiency, it is preferable that the ratio of the amount of the silver salt to the amount of the solvent to be used is 1.2 mmol: 15-30 mL.
In the above production method, the conditions of the contact reaction and the standing may be selected within a wide range, but in order to further improve the reaction efficiency and the yield, it is preferable that the contact reaction satisfies the following conditions: stirring, reacting at 45-55 deg.C for 10-20 min; preferably, the standing satisfies the following conditions: standing at 20-30 deg.C for 8-12 min.
In the above production method, the conditions for drying may be selected within a wide range, but in order to further improve the adsorption performance of AgNPs @ ag (i) -MTMP, it is preferable that the drying satisfies the following conditions: the drying temperature is-45 to-55 ℃, and the drying time is 48 to 72 hours. The freeze-drying time is too long, the solvent is lost too much, the gel fibers are packed more tightly, and the dye adsorption effect is reduced.
In the above production method, the kind of the solvent may be selected within a wide range, but in order to further improve the adsorption property of AgNPs @ Ag (I) -MTMP, it is preferable that the solvent is selected from CH3OH、CH3CH2OH、DMSO/H2O mixed solution, DMF/H2At least one of O mixed solution; preferably, the solvent is DMF, H2A mixed solution of O; more preferably, DMF, H2The volume ratio of O is 1: 0.9-1.1. The MTMP has good solubility in DMF solvent, so that the MTMP can be completely polymerized with silver salt to form gel with good effect, and the DMF has reducibility and can reduce the silver salt into Ag nano particles, thereby forming more silver nano particles.
In the above production method, the kind of the silver salt may be selected within a wide range, but from the viewpoint of cost, it is preferable that the silver salt is selected from AgNO3、AgClO4At least one of (a).
In the above production method, the pH at the start of the contact reaction can be selected within a wide range, but in order to further improve the adsorption and antibacterial properties of the produced AgNPs @ Ag (I) -MTMP, it is preferable that the pH at the start of the contact reaction is 5.0 to 8.0, preferably 6 to 7.
In the above preparation method, MTMP may be a commercially available product or may be obtained by a self-preparation method, and in order to further improve the purity of MTMP, MTMP is preferably prepared by the following method: mixing 2-mercapto-5-amino-1, 3, 4-thiadiazole (AMTD) and salicylaldehyde according to the weight ratio of 1: 1 in ethanol, refluxing at 80 ℃ for 3 hours, washing the generated yellow precipitate with excessive water, methanol and ether respectively, and drying in vacuum to obtain yellow powder for later use.
The invention further provides an application of the bifunctional sulfhydryl Schiff base metal organogel-nanocomposite AgNPs @ Ag (I) -MTMP in adsorption of acidic organic dyes in water and/or sterilization of water.
In the above application, the specific kind of the acidic organic dye may be selected from a wide range, but in order to further improve the adsorption effect of AgNPs @ ag (i) -MTMP, it is preferable that the acidic organic dye is selected from at least one of NG naphthol green B, acid magenta AF, congo red CR, and methyl orange MO.
In the above application, the bacteriostatic range of AgNPs @ ag (i) -MTMP may be selected within a wide range, but in order to further improve the bacteriostatic effect of AgNPs @ ag (i) -MTMP, more preferably, the application of AgNPs @ ag (i) -MTMP in the suppression of escherichia coli, bacillus subtilis, and staphylococcus aureus in a water body.
The present invention will be described in detail below by way of examples. Salicylaldehyde, absolute ethyl alcohol, DMF, NaOH and naphthol green B are sold by the chemical reagent company Limited of the national drug group; congo red and acid fuchsin (commercially available from Aladdin laboratory reagent Co., Ltd.; methyl orange is commercially available from Guanfu Fine chemical research institute of Tianjin, beef extract and peptone are commercially available from Shanghai laboratory reagent Co., Ltd.; 2-mercapto-5-amino-1, 3, 4-thiadiazole and agar are commercially available from Bailingwei science and technology Co., Ltd.; and secondary distilled water is prepared by a double pure water distiller of SZ-93 from Shanghai subsumonr Biochemical instruments.
The following examples and tests in the test examples used the detection instrument: an X-ray powder diffractometer (Cu target, XRD-6000, Hitachi, Japan); a field emission scanning electron microscope (FESEM, S-8100, Hitachi, Japan); 120KV transmission electron microscope (TEM, HT-7700, Hitachi, Japan); infrared spectrometer (FT-IR, XECTOR22, Hitachi, Japan, KB Tablets); ultraviolet spectrophotometer (UV-1800 Shanghaineno scientific instruments Co., Ltd.).
Preparation example 1
Preparation of MTMP:
taking AMTD (1.0mmol), salicylaldehyde (1.0mmol) and 20mL of absolute ethyl alcohol, carrying out magnetic stirring, and carrying out reflux reaction at 80 ℃ for 3h to obtain yellow precipitate; filtering, washing the solid with water, methanol and ether, and vacuum drying for 5 hr to constant weight.
Subjecting the obtained solid powder to1HNMR detection, the obtained data are1H NMR(500MHz,d6δ 14.5(d,1H, SH)11.21(d,1H, OH),8.80, (d,1H, C ═ N),7.88(d,1H, NH),7.5,7.0(d,4H, phenyl ring H).
Example 1
Taking MTMP (1.0mmol) and AgNO3(1.2mmol)、10mL DMF、10mLH2Mixing O, adjusting pH to 6.5, heating and stirring at 50 deg.C for 10min to obtain orange solution, and standing at 25 deg.C for 10min to obtain orange gel; freeze-drying at-50 deg.C for 48h to constant weight to obtain AgNPs @ Ag (I) -MTMP metal organogel-nanocomposite.
Example 2
Taking MTMP (1.0mmol) and AgNO3(0.6mmol)、10mL DMSO、10mLH2Mixing O, adjusting pH to 5, heating and stirring at 45 deg.C for 15min to obtain orange solution, and standing at 20 deg.C for 12min to obtain orange gel; freeze-drying at-45 deg.C for 72h to constant weight to obtain AgNPs @ Ag (I) -MTMP metal organogel-nanocomposite.
Example 3
Taking MTMP (1.0mmol) and AgNO3(0.8mmol)、20mL CH3CH2OH, mixing, adjusting the pH value to 8, heating and stirring at 45 ℃ for 15min to obtain an orange solution, and standing at 30 ℃ for 8min to obtain an orange gel; freeze-drying at-55 deg.C for 48h to constant weight to obtain AgNPs @ Ag (I) -MTMP metal organogel-nanocomposite.
Example 4
The procedure is as in example 1, except that AgNO is added3And exchanged for silver perchlorate.
Comparative example 1
Preparation of precursor Ag (I) -MTMP-gel:
the procedure is as in example 1, except that no freeze-drying treatment is carried out.
Detection example 1
SEM, TEM, XRD and BET detections of the AgNPs @ Ag (I) -MTMP metal organogel-nanocomposite material prepared in example 1 and example 4 are shown in figure 2-1, figure 2-2, figure 3-1, figure 3-2, figure 4-1, figure 4-2, figure 5-1 and figure 5-2(a represents that the raw material is AgNO3B represents that the raw material is AgClO4) As can be seen from the figure: SEM can see that the composite material obtained is mainly formed by stacking one-dimensional linear fibers formed by Ag (I) -MTMP coordination polymer, TEM can see that silver nanoparticles with the particle size of 30-70nm and the average particle size of about 50nm are attached to the linear fibers, and the comparison of XRD and standard card JCPDS04-0783 shows that peaks at 38.09 degrees, 44.28 degrees, 64.54 degrees and 77.42 degrees respectively correspond to crystal faces (111), (200), (220) and (311) of Ag, which indicates that AgNPs exists in the material obtained; the surface area of the resulting material is 365.3539m, as determined by BET2·g-1And the pore diameter is about 25 nm.
Test example 2
Adsorption of AgNPs @ ag (i) -MTMP metal organogel-nanocomposites on various dyes was carried out at 25 ℃:
dissolving different amounts of dye in 50mL of secondary distilled pure water to form a series of dye solutions with the concentration of 0-100mg/L, respectively measuring a certain amount of dye solution, and testing the absorbance. Then 10mg of the AgNPs @ Ag (I) -MTMP gel nanocomposite (prepared in example 1) was placed in a beaker and stirred at 25 ℃ to allow complete adsorption. Then taking out a certain amount of the liquid after adsorption every 10min, centrifuging and taking the supernatant, and measuring the absorbance of the dye after adsorption.
The removal efficiency of the dye was found according to the following calculation:
wherein C is0To the initial concentration of the dye before adsorption, CfIs the dye concentration after adsorption.
The adsorption detection of naphthol green B, congo red, methyl orange and acid fuchsin was carried out as described above, and the detection results are shown in fig. 6-9 and 11. As can be seen from the figure, after 3 hours, the removal efficiency of the composite material on dyes naphthol green B, acid fuchsin, methyl orange and congo red is respectively as follows: 95%, 90%, 89% and 90%.
Test example 2
AgNPs @ Ag (I) -MTMP gel nanocomposite adsorption capacity assay:
dissolving different amounts of dye in 50mL of secondary distilled pure water to form a series of dye solutions with the concentration of 0-100mg/L, respectively measuring a certain amount of dye solution, and testing the absorbance. 10mg of the metal organogel-nanocomposite (prepared in example 1) was placed in a beaker and stirred at 25 ℃ to reach adsorption equilibrium. Then taking out a certain amount of the liquid after adsorption, centrifuging to take supernatant, and measuring the absorbance of the dye after adsorption. Saturated adsorption capacity q of gel nanocompositeseCalculated by the following formula:
wherein C is0Is the initial concentration of the dye solution, CeW is the mass of the gel composite adsorbent and V is the volume of the solution in order to adsorb the dye solution concentration after equilibrium.
Equilibrium adsorption q of Naphthol Green B, Congo Red, methyl orange and acid fuchsin according to the above methodeThe detection result is shown in fig. 10, and it can be seen from the figure that the maximum adsorption amounts of the composite material to dyes naphthol green B, acid fuchsin, methyl orange and congo red are respectively: 225mg g-1、172mg·g-1、168mg·g-1、165mg·g-1(ii) a The composite material can achieve the absorption after 100minAnd (4) balancing.
Test example 3
Effect of pH, temperature on performance of AgNPs @ ag (i) -MTMP metal organogel-nanocomposite (prepared in example 1) for adsorption of acid dyes:
PBS buffer solution (phosphate buffer solution, pH 2-12) was used; with 0.1 mol. L-1HCl solution and 0.1 mol. L-1The pH of the NaOH solution was adjusted, and the pH of each solution was measured with a pH meter.
The procedure of example 2 was followed, varying the pH, and testing the dye adsorption performance as a function of pH; specific results are shown in table 1.
The method is carried out according to the method of the embodiment 2, the temperature is changed, the temperature is controlled between 300-360K, and the change of the dye adsorption performance along with the temperature is tested; the specific results are shown in Table 2.
The optimal pH condition for dye adsorption by AgNPs @ Ag (I) -MTMP is shown by the detection: 6-7; the optimum temperature conditions are: 300K.
TABLE 1
TABLE 2
Test example 4
And (3) desorption circulation:
the dye-adsorbed metal organogel-nanocomposite (prepared in example 1) was added to 50mL (2 mol. L.)-1) The solution was stirred for 48 hours for desorption, and then centrifuged at 7000rpm for 2min to take out the gel-nanocomposite, which was washed three times with deionized water and absolute ethanol. Drying the desorbed material at 50 ℃; then testing the adsorption capacity of the material by a batch method, and repeating the experiment for 5 times; the specific results are shown in Table 3, which shows that the obtained material can be regenerated and recycled for multiple times.
TABLE 3
Test example 5
Preparation of a culture medium: weighing beef extract 3g, peptone 10g, NaCl 5g, and agar 18g, dissolving in hot water at 50 deg.C, and adding 0.2 mol.L-1Adjusting the pH value of the NaOH solution to 7.2-7.4, and then sterilizing the culture solution for 3 hours by high-temperature steam. And (3) uniformly coating the sterilized culture solution on a culture medium, and naturally cooling to form a solid culture medium.
And (3) antibacterial experiment: uniformly coating escherichia coli, staphylococcus aureus and bacillus subtilis on a solid culture medium, then placing an oxford cup in the center of the culture medium, adding 10mg of metal organic gel-nanocomposite (prepared in example 1) into the oxford cup, then placing the oxford cup into an incubator at 37 ℃ for 24 hours, and measuring the inhibition zone of the culture medium; the results are shown in FIG. 12.
The antibacterial performance of the AgNPs @ Ag (I) -MTMP gel nanocomposite is judged by measuring the diameter of a bacteriostatic zone of a solid medium. The method specifically comprises the following steps: mixing AgNPs @ Ag (I) -MTMP gel (Xerogel) nanocomposite, MTMP, AgNO3And a precursor Ag (I) -MTMP-gel (gel) are respectively used for carrying out antibacterial detection on escherichia coli (E.coli), bacillus subtilis (B.subtilis) and staphylococcus aureus (S.aureus), and specific results are shown in table 4, which shows that the obtained gel nanocomposite shows good antibacterial performance on the three bacteria, and particularly has extremely high antibacterial activity on bacillus subtilis.
TABLE 4
The products of examples 2 to 4 were examined in the same manner as in examples 2 to 5, and the examination results were substantially identical to those of the product of example 1.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (20)
1. A bifunctional thiol Schiff base metal organogel-nanocomposite AgNPs @ Ag (I) -MTMP, wherein the AgNPs @ Ag (I) -MTMP comprises silver nanoparticles AgNPs, Ag (I) -MTMP and a solvent, the AgNPs are adsorbed on the Ag (I) -MTMP, and the Ag (I) -MTMP wraps the solvent by hydrogen bond and molecular force; the chemical formula of Ag (I) -MTMP is [ Ag (MTMP ]]n(L)n，[Ag(MTMP)]n n+The structure of (A) is shown as a formula I, wherein L is a negative monovalent anion, n is a positive integer, and MTMP is 2- ((5-mercapto-1, 3, 4-thiadiazole-2-imino) methyl) phenol;
2. the bifunctional mercaptoschiff base metal organogel-nanocomposite AgNPs @ ag (i) -MTMP of claim 1, wherein the ag (i) -MTMP is a linear fiber structure.
3. The bifunctional mercaptoschiff base metal organogel-nanocomposite AgNPs @ ag (i) -MTMP of claim 2, wherein L is selected from at least one of nitrate, perchlorate.
4. The method of claim 2The bifunctional mercaptoschiff base metal organogel-nanocomposite AgNPs @ Ag (I) -MTMP, wherein the solvent is selected from CH3OH、CH3CH2OH、DMSO/H2O mixed solution, DMF/H2At least one of O mixed solution.
5. The bifunctional mercaptoschiff base metal organogel-nanocomposite AgNPs @ ag (i) -MTMP of claim 2, wherein the solvent is DMF, H2And (3) mixed solution of O.
6. A method of preparing the bifunctional mercaptoschiff base metal organogel-nanocomposite, AgNPs @ ag (i) -MTMP, of claim 1, comprising: putting silver salt AgL and MTMP into a solvent, mixing, adjusting pH, carrying out contact reaction, standing and drying to obtain the AgNPs @ Ag (I) -MTMP.
7. The preparation method according to claim 6, wherein the molar ratio of the silver salt to the MTMP is 0.6-1.2: 1.0.
8. the production method according to claim 7, wherein the ratio of the amount of the silver salt to the solvent is 1.2 mmol: 15-30 mL.
9. The production method according to claim 6, wherein the contact reaction satisfies the following condition: stirring, reacting at 45-55 deg.C for 10-20 min.
10. The production method according to claim 9, wherein the standing satisfies the following condition: standing at 20-30 deg.C for 8-12 min.
11. The production method according to claim 9, wherein the drying satisfies the following condition: the drying temperature is-45 to-55 ℃, and the drying time is 48 to 72 hours.
12. The method of claim 6, wherein the solvent is selected from CH3OH、CH3CH2OH、DMSO/H2O mixed solution, DMF/H2At least one of O mixed solution.
13. The preparation method according to claim 12, wherein the solvent is DMF, H2And (3) mixed solution of O.
14. The method of claim 12, wherein the DMF, H2The volume ratio of O is 1: 0.9-1.1.
15. The method of claim 6, wherein the silver salt is selected from AgNO3、AgClO4At least one of (a).
16. The production method according to claim 15, wherein the contact reaction is started at a pH of 5.0 to 8.0.
17. The production method according to claim 15, wherein the contact reaction is started at a pH of 6 to 7.
18. The use of the bifunctional mercaptoschiff base metal organogel-nanocomposite AgNPs @ Ag (I) -MTMP of claim 1 or2 for adsorbing acidic organic dyes in water and/or sterilizing water.
19. Use according to claim 18, wherein the acidic organic dye is selected from at least one of NG naphthol green B, acid magenta AF, congo red CR, methyl orange MO.
20. Use according to claim 18, wherein the AgNPs @ ag (i) -MTMP is for use in the inhibition of e.
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