CN109663576A - A kind of montmorillonite load molysite MOFs adsorbent and preparation method thereof - Google Patents
A kind of montmorillonite load molysite MOFs adsorbent and preparation method thereof Download PDFInfo
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- CN109663576A CN109663576A CN201910106455.4A CN201910106455A CN109663576A CN 109663576 A CN109663576 A CN 109663576A CN 201910106455 A CN201910106455 A CN 201910106455A CN 109663576 A CN109663576 A CN 109663576A
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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
- 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
- B01J20/226—Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF]
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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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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Abstract
The invention discloses a kind of preparation methods of montmorillonite load molysite MOFs adsorbent, are that molysite and organic ligand are dissolved into polar solvent, and acid montmorillonite is added thereto and is dispersed with stirring uniformly；Then mixed dispersion liquid is moved into reaction kettle, is warming up to 100 ~ 180 DEG C of 8 ~ 24 h of reaction；It cools down after reaction, product is collected by centrifugation；Product is washed to remove dry, obtained pale yellow powder i.e. montmorillonite load molysite MOFs adsorbent material after unreacted molysite and organic ligand.The present invention utilizes the special construction and property of montmorillonite, and the molysite MOFs with biocompatibility is supported on lamella montmorillonite surface in situ by hydro-thermal method；By controlling the microscopic dimensions and structure of molysite MOFs, obtaining more more stable than pure iron salt MOFs and there is more efficient adsorption effect.The adsorbent has preferable absorption property to dyestuff waste liquid, has a good application prospect in Adsorption waste water from dyestuff field.
Description
Technical field
The present invention relates to a kind of preparation methods of montmorillonite load molysite MOFs adsorbent, are mainly used for the place of waste water from dyestuff
Reason, belongs to technical field of composite materials and technical field of waste water processing.
Background technique
With the fast development of industry and the rapid growth of population, water pollution problems becomes increasingly conspicuous.In order to which dirt is effectively treated
Waste water is contaminated, water treatment technology is concerned, and adsorbs, filters, many processing means such as dialysis and degradation are come into being.Absorption method letter
It is single effective and low in cost, thus develop a kind of efficient and environmental-friendly adsorbent material be the important developing direction in the field it
One.The characterization of adsorption of adsorbent material is attributed to its big specific surface area and Kong Rong mostly, and in the porous material, inorganic-organic is more
Porous materials are concerned in recent years, wherein MOFs(metal-organic framework materials) representative as inorganic-organic porous material
As research hotspot.MOFs is one kind that metal ion (or metal cluster) and organic ligand are interconnected to form by self assembly
Crystalline state porous material with periodic network structure, it has type more, functional, porosity and large specific surface area, living
Property site it is abundant, the features such as pore size is controllable, be commonly applied to the fields such as gas absorption and storage and transportation, electrode material, drug mediator.By
In the stronger electropositive in surface and conjugation, MOFs material shows certain adsorption capacity to dyestuff, wherein its adsorptivity
It can not only be influenced by metal ion, and by organic ligand, heterozygosis ion and carriers affect, such as: with zinc nitrate and 3,5-
Two-(triazole -1- alkene)-benzoic acid are that the zinc-base MOF complex of raw material preparation has good adsorption capacity to Congo red
(CN108355611A)；The molysite organic framework material (MIL-100-Fe) prepared using iron powder and trimesic acid as raw material is to having
Engine dyeing material malachite green has good adsorption capacity (CN107964102A)；Tetraethylenepentamine is grafted to chromic salts MIL-101
On obtained amination chromic salts MIL-101 have good adsorption capacity (CN108371941A) to heavy metal arsenic；With five water nitric acid
Bismuth and trimesic acid are that the bismuth salt MOF of raw material preparation has good selective absorption (CN108273472A) to selenite radical；
Nickel doping molysite MIL-53 has good adsorption capacity (CN108911009A) to antibiotic retens in water body；Cobalt zinc
Bimetallic core-shell structure metal-organic framework material (ZIF-8 ZIF-67) has good adsorption capacity to heavy metal
(CN107964102A).
Due to MOFs materials chemistry stability, mechanical strength is poor the disadvantages of, but compound change with inorganic, organic material
It is apt to its disadvantages mentioned above, and optimizes its performance.Such as: MIL-101 (Cr), MIL-53 (Al), UIO-66, ZIF-8 MOFs material with
After natural polymer (sodium alginate, chitosan) is compound, prepared MOFs/ natural polymer composite bead has brufen good
Good adsorption capacity (WO2017/133324A1)；The MOFs/ graphene composite wood to be formed is blended with MOFs Material Physics for graphene
Material is to CO2With good adsorption capacity (CN106064052A)；Growth in situ has the chitosan nano of metal-organic framework material
Rice tunica fibrosa has excellent adsorption capacity (CN108816064A) to dyestuff；The modified organic bone of chromium metal of poly- unsaturated carboxylic acid class
Frame material has good adsorption capacity (CN108912343A) to rare earth metal；By NH2- MIL-101 (Al), polyvinylpyrrolidine
Core-shell nano flower composite material prepared by ketone, zinc nitrate, 2-methylimidazole has good adsorption capacity to copper ion
(CN108854974A)；Magnetic MOFs composite material (UiO-66@SiO2@Fe3O4) have to antibiotic lavo-ofloxacin in water body it is good
Good absorption property (CN107570116A).However, above-mentioned material has, manufacture craft is relative complex, partially uses expensive raw materials
The disadvantages of.Therefore, the developing direction that simple, efficient, cheap and environmental-friendly MOFs composite material is such material is developed.
Clay mineral has lower cost and more excellent absorption property, this makes it be commonly used for adsorbent, to
Remove the harmful substances such as dyestuff, heavy metal ion and the surfactant in water.Currently, about the compound of MOFs and clay
Material, such as: with concave convex rod, aluminum nitrate, the solid powder antistaling agent (aluminium salt that 2,5- dihydroxy-terephthalic acid (TPA) is Material synthesis
MOFs), it is used for fruit and vegetable fresh-keeping agent (CN108719456A), is using attapulgite as supporter, for inhibiting MOFs to meet water-bound
Collapse problem.But organic ligand price used in the material is higher, does not probe into absorption dyestuff aspect.Montmorillonite is a kind of
The sheet clay of reserves very abundant has stronger elecrtonegativity based on its surface, has absorption to dyestuff, heavy metal ion
Performance.By MOFs material with using montmorillonite in conjunction with the cheap inorganic mineral material of Typical Representative, preparation montmorillonite Composite absorption
Agent can not only increase its absorption property, moreover it is possible to adsorbent cost be greatly lowered.
Summary of the invention
It is an object of the present invention to provide a kind of preparation methods of montmorillonite load molysite MOFs adsorbent, are used for as adsorbent
Adsorb waste water from dyestuff field.
One, the preparation of montmorillonite load molysite MOFs adsorbent
The preparation method of montmorillonite load molysite MOFs adsorbent material of the present invention is that molysite and organic ligand are dissolved into polarity is molten
In agent, acid montmorillonite is added thereto and is dispersed with stirring uniformly；Then mixed dispersion liquid is moved into reaction kettle, it is warming up to 100 ~
180 DEG C of 8 ~ 24 h of reaction；It is cooled to room temperature after reaction, product is collected by centrifugation；Product is washed to remove unreacted molysite
After organic ligand, adsorbed in 80 ~ 170 DEG C of 8 ~ 16h of vacuum drying, the i.e. montmorillonite load molysite MOFs of obtained pale yellow powder
Material.
The molysite is FeCl3•6H2O、Fe2(SO4)3•9H2O、Fe(NO3)3•9H2O；Organic ligand be terephthalic acid (TPA) or
Trimesic acid；The mass ratio of molysite and organic ligand is 1:0.2 ~ 1:2.4；The mass ratio of molysite and acid montmorillonite is 1:
0.6~1:6.0。
The polar solvent refers to N, N '-dimethyl formamide or/and distilled water；The washing is successively with N, N '-diformazan
Base formamide and dehydrated alcohol wash 2 ~ 6 times.
In the montmorillonite load molysite MOFs adsorbent of above-mentioned preparation, molysite MOFs is MIL-53 (Fe), MIL-100 (Fe)
Or MIL-101 (Fe).
Two, the characterization and performance test of montmorillonite load molysite MOFs adsorbent
1, macroscopic view and microscopic appearance
Montmorillonite load molysite MOFs adsorbent is flaxen powder, and color is more shallow compared with pure iron salt MOFs, and explanation is white
Molysite MOFs has been loaded in color montmorillonite substrate.
Using the pattern of scanning electron microscopic observation montmorillonite load molysite MOFs adsorbent, as a result as shown in Figure 1.It can see
Out, montmorillonite load molysite MOFs adsorbent substrate is typical montmorillonite layer granule-morphology, on montmorillonite layer shape surface
Molysite MOFs little particle is loaded, the particle is compared with simple molysite MOFs particle, and partial size becomes smaller, and size is mainly distributed on
300nm ~ 1 μm, nano-scale particle is in the majority, be it is typical octahedronlike, this body structure surface product is big, and absorption property is preferable.
2, infrared spectrum analysis
Fig. 2 is the infrared absorpting light spectra of montmorillonite load molysite MOFs adsorbent.Figure it is seen that in 3603 cm-1Out
The stretching vibration of O-H in existing montmorillonite, in 1016 cm-1With 453 cm-1Occur in montmorillonite the asymmetric vibration of Si-O and
The bending vibration of Si-O-Si；In 1380 cm-1With 740 cm-1There is the symmetric vibration and C-H of C-O in molysite MOFs carboxyl
Bending vibration.This shows that montmorillonite structure is kept substantially, the characteristic peak of molysite MOFs also occurs, this is consistent with SEM result.
3, XRD analysis
Fig. 3 is the X-ray diffractogram of montmorillonite load molysite MOFs adsorbent.The diffraction maximum wherein occurred at 9.1 ° belongs to molysite
The characteristic diffraction peak of MOFs, 19.8 °, 27.6 ° of diffraction maximum belong to the characteristic diffraction peak of montmorillonite, 14.0 ° of diffraction maximum belongs to
Kaolinic characteristic diffraction peak in montmorillonite illustrates that composite material is made of montmorillonite and molysite MOFs, this and SEM, infrared light
It is consistent to compose result.
4, absorption property
In order to test the absorption property of adsorbent, methylene blue is chosen as representative organic pollutant, carries out adsorption test.
0.05g adsorbent is weighed, is distributed in the methylene blue solution of 50mL 200mg/L, with 120 r/min of revolving speed, in 25 DEG C of constant temperature
Oscillation is sampled every 10min, filtering, and the concentration of remaining methylene blue is measured using ultraviolet-visible spectrophotometry, calculates removal
Rate.
Fig. 4 is adsorption curve of the montmorillonite load molysite MOFs adsorbent to methylene blue.From figure it is found that with adsorption time
It gradually increases, the removal rate of dyestuff is gradually increased, and absorption reaches balance after 80min, and removal rate is up to 99.64%.Illustrate to cover
De- soil load MIL-53 (Fe) adsorbent has good removal capacity to methylene blue.
The present invention is used using the special construction and property (laminar structured and surface has stronger elecrtonegativity) of montmorillonite
In-situ growth technology will have biocompatibility molysite MOFs to be supported on lamella montmorillonite surface in situ by hydro-thermal method.Pass through
The microscopic dimensions and structure for controlling molysite MOFs obtain more more stable than pure iron salt MOFs and have more efficient adsorption effect.It should
Adsorbent has preferable absorption property to dyestuff waste liquid, has a good application prospect in Adsorption waste water from dyestuff field.
Detailed description of the invention
Fig. 1 is the scanning electron microscope (SEM) photograph of montmorillonite load molysite MOFs adsorbent.
Fig. 2 is the infared spectrum of montmorillonite load molysite MOFs adsorbent.
Fig. 3 is the XRD of montmorillonite load molysite MOFs adsorbent.
Fig. 4 is adsorption curve of the montmorillonite load molysite MOFs adsorbent to methylene blue.
Specific embodiment
Preparation and its absorption property below by specific embodiment to montmorillonite load molysite MOFs adsorbent of the present invention
It is described further.
Embodiment 1
Firstly, weighing 0.5 g FeCl3•6H230 mL N, N '-dimethyl is added in beaker in O and 1.2 g terephthalic acid (TPA)s
Formamide, stirring and dissolving.Secondly, 0.4 g acid montmorillonite is added, 1h is stirred at room temperature, keeps raw material evenly dispersed.Then,
Mixture is moved in 50mL polytetrafluoroethyllining lining stainless steel cauldron, 120 DEG C of 12 h of reaction are warming up to.It is cooling to reaction kettle
To room temperature, reaction mixture is taken out by the way that product is collected by centrifugation under certain revolving speed, product is successively used into N, N '-dimethyl formyl
Amine and dehydrated alcohol wash 2 times, remove unreacted molysite and organic ligand.Finally, being obtained yellowish in 80 DEG C of 10 h of vacuum drying
Color powder, i.e. montmorillonite load molysite MOFs adsorbent.The adsorbent is up to 99.10% to the removal rate of methylene blue.
Embodiment 2
Firstly, weighing 0.5 g Fe (NO3)3•9H250 mL N, N '-diformazans are added in beaker in O and 0.1 g trimesic acid
The mixture of base formamide and water, stirring and dissolving.Secondly, 0.9 g acid montmorillonite is added, 2 h are stirred at room temperature, make raw material
It is evenly dispersed.Then, mixture is moved in 100 mL polytetrafluoroethyllining lining stainless steel cauldrons, is warming up to 160 DEG C of reactions
17h.It is cooled to room temperature to reaction kettle, takes out reaction mixture and successively used product by the way that product is collected by centrifugation under certain revolving speed
N, N '-dimethyl formamide and dehydrated alcohol wash 4 times, remove unreacted molysite and organic ligand.Finally, true at 100 DEG C
Dry 12 h of sky, obtain pale yellow powder, i.e. montmorillonite load molysite MOFs adsorbent.Removal rate of the adsorbent to methylene blue
Up to 99.64%.
Embodiment 3
Firstly, weighing 5 g Fe (NO3)3•9H260 mL N, N '-dimethyl is added in beaker in O and 1.2 g terephthalic acid (TPA)s
Formamide, stirring and dissolving.Secondly, 3.5 g acid montmorillonites are added, 2 h are stirred at room temperature, keep raw material evenly dispersed.Then,
Mixture is moved in reaction kettle, 180 DEG C of 20 h of reaction are warming up to.It is cooled to room temperature to reaction kettle, takes out reaction mixture, led to
It crosses under certain revolving speed and product is collected by centrifugation, product is successively used into N, N '-dimethyl formamide and dehydrated alcohol are washed 4 times, removed
Unreacted molysite and organic ligand.Finally, obtaining pale yellow powder, i.e. montmorillonite load molysite in 170 DEG C of 14 h of vacuum drying
MOFs adsorbent.The adsorbent is up to 98.96% to the removal rate of methylene blue.
Embodiment 4
Firstly, weighing 1.4 g FeCl3•6H270 mL N, N '-dimethyl is added in beaker in O and 1.6 g trimesic acids
Formamide, stirring and dissolving.Secondly, 2.5 g acid montmorillonites are added, 3 h are stirred at room temperature, keep raw material evenly dispersed.Then,
Mixture is moved in reaction kettle, 160 DEG C of 24 h of reaction are warming up to.It is cooled to room temperature to reaction kettle, takes out reaction mixture, led to
It crosses under certain revolving speed and product is collected by centrifugation, product is successively used into N, N '-dimethyl formamide and dehydrated alcohol are washed 5 times, removed
Unreacted molysite and organic ligand.Finally, obtaining pale yellow powder, i.e. montmorillonite load molysite in 130 DEG C of 10 h of vacuum drying
MOFs adsorbent.The adsorbent is up to 99.36% to the removal rate of methylene blue.
In the various embodiments described above, acid montmorillonite the preparation method comprises the following steps: at room temperature, by 5 g montmorillonites in 50 mL hydrochloric acid
Solution (1 mol/L) is stirred to react 2 h, and filtering is washed with distilled water 4 ~ 10 times, until cleaning solution is in neutrality.Product baking oven (80
DEG C) drying, obtain acid montmorillonite.
Claims (8)
1. a kind of preparation method of montmorillonite load molysite MOFs adsorbent, is that molysite and organic ligand are dissolved into polar solvent
In, acid montmorillonite is added thereto and is dispersed with stirring uniformly；Then mixed dispersion liquid is moved into reaction kettle, it is warming up to 100 ~
180 DEG C of 8 ~ 24 h of reaction；It is cooled to room temperature after reaction, product is collected by centrifugation；Product is washed to remove unreacted molysite
With dry after organic ligand, obtained pale yellow powder i.e. montmorillonite load molysite MOFs adsorbent.
2. a kind of preparation method of montmorillonite load molysite MOFs adsorbent as described in claim 1, it is characterised in that: the iron
Salt is FeCl3•6H2O、Fe2(SO4)3•9H2O、Fe(NO3)3•9H2O。
3. a kind of preparation method of montmorillonite load molysite MOFs adsorbent as described in claim 1, it is characterised in that: You Jipei
Body is terephthalic acid (TPA) or trimesic acid.
4. a kind of preparation method of montmorillonite load molysite MOFs adsorbent as described in claim 1, it is characterised in that: molysite with
The mass ratio of organic ligand is 1:0.2 ~ 1:2.4.
5. a kind of preparation method of montmorillonite load molysite MOFs adsorbent as described in claim 1, it is characterised in that: molysite with
The mass ratio of acid montmorillonite is 1:0.6 ~ 1:6.0.
6. a kind of preparation method of montmorillonite load molysite MOFs adsorbent as described in claim 1, it is characterised in that: the pole
Property solvent refers to N, N '-dimethyl formamide or/and distilled water.
7. a kind of preparation method of montmorillonite load molysite MOFs adsorbent as described in claim 1, it is characterised in that: described to wash
It washs successively to use N, N '-dimethyl formamide and dehydrated alcohol wash 2 ~ 6 times.
8. a kind of preparation method of montmorillonite load molysite MOFs adsorbent as described in claim 1, it is characterised in that: described dry
Dry finger is dried in vacuo 8 ~ 16h at 80 ~ 170 DEG C.
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