CN109621910A - Nano zero valence iron-metal organic frame core-shell material preparation method and applications - Google Patents
Nano zero valence iron-metal organic frame core-shell material preparation method and applications Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28011—Other properties, e.g. density, crush strength
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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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses nano zero valence iron-metal organic frame core-shell material NZVI@ZD preparation methods, method includes the following steps: (1) weighs molysite and polyvinylpyrrolidone (PVP) is dissolved in the ethanol solution that volume fraction is 60%, continued mechanical stirs under a nitrogen atmosphere, obtains anaerobic mixed liquor；It weighs sodium borohydride to be dissolved in deionized water, and is added dropwise in above-mentioned anaerobic mixed liquor, whole process keeps nitrogen and mechanical agitation, obtain NZVI crude product, NZVI crude product is washed with dehydrated alcohol, magnet is dried in vacuo after separating and collecting, and obtains NZVI；(2) salt solubility is weighed in methanol, after being completely dissolved, is dispersed NZVI in cobalt salt solution, and NZVI/Co mixed liquor is obtained；It weighs organic ligand and is dissolved in methanol, be subsequently added in NZVI/Co mixed liquor, standing obtains NZVI@ZIF-67 crude product, is washed with methanol, magnet is dried in vacuo after separating and collecting, and obtains NZVI@ZIF-67；(3) by NZVI@ZIF-67 material in tube furnace, lead to nitrogen calcining, obtain NZVI@ZD.Method of the invention effectively can synchronize absorption and reduction to Cr (VI), can be applied to processing containing Cr (VI) waste water.
Description
Technical field
The invention belongs to material preparation and water-treatment technology fields, are related to the preparation method of core-shell material NZVI@ZD and answer
With being gone using NZVI reinforced metal organic frame (MOF) derived material NZVI@ZD to heavy metal Cr in water pollution (VI)
It removes.
Background technique
(Cr (VI) is a kind of supertoxic agent to Cr VI, it is considered to be carcinogenic substance, mutagens and teratogens in biosystem.
It is widely used in the fields such as chromium plating, leather process hides, cooling tower, wood preservation, weaving, pigment, and concentration is higher in the environment, work
Concentration in industry waste water is 0.5~270mg L-1.The World Health Organization suggests for Cr (VI) concentration in surface water body being down to
0.05mg L-1.Therefore, before being discharged into Water Environment System, it is necessary to remove Cr (VI) from waste water.And it chooses and Cr (VI) is removed
High-efficient material then becomes water pollution and repairs the important scientific problems that field needs to solve.
Metal-organic framework materials (MOFs) be by a suitable solvent, central metallic ions or metal cluster with have
One kind of machine ligand self assembly has the porous material of crystal structure.Due to the combination of organic and inorganic materials, MOFs tool
There are large specific surface area, Kong Rong great and the unique properties such as chemical structure can be cut.These intrinsic characteristics make MOFs in various applications
In there is very high potentiality, such as gas absorption, separation, catalysis, drug release, optics and sensing.As adsorbent, MOFs
High-specific surface area and porosity facilitate pollutant by the absorption and diffusion of skeleton, there is MOFs in heavy metal adsorption
Wide application prospect.In recent years, nanoparticle (NPs) is controllably integrated into MOFs, by the uniqueness for collecting two components
Property promotes the correlative study of material property, causes more and more concerns.Core-shell structure copolymer NPs@MOFs structure is as various
A kind of common form of NPs/MOFs composite construction, it is considered to be realize inorganic NPs and multi-functional MOFs performance synergistic effect
One of most convenient, most efficient method.There are two significant advantages for core-shell structure copolymer NPs MOFs structure tool: (1) due to MOFs shell
Cladding, the migration of partial size is small, surface is high NPs core and aggregation are extremely limited, to maintain NPs core
Stability and chemical activity；(2) the respective characteristic of NPs and MOFs can be effectively bonded together.The absorption property of MOFs
Depend primarily on their aperture.However, the MOFs of most of reports is micropore (aperture < 2nm), this can hinder macromolecular
Diffusion, and limit the interaction of they and activated centre in MOFs structure.
Nano zero valence iron (NZVI) have many advantages, such as large specific surface area, reducing power are strong, absorption property is strong, be easily isolated and
It is applied to the removal of Cr (VI).However, NZVI technology the disadvantages of there is easy aggregation, easily oxidizable and poor fluidities, resistance
The extensive use of NZVI technology is hindered.Therefore, it will usually select a suitable carrier material and NZVI compound, and in recent years
MOFs is used as the carrier material compound with NZVI.Zhou et al. (J.Chromatogr.A, 1487 (2017) 22-29) in
Merge MOFs and NZVI (Fe@MIL-101 (Cr)) for the first time within 2017.Li et al. people (J.Solid State Chem., 269 (2019)
16-23) use Zn-MOF-74 as the carrier material (nZVI@Zn-MOF-74) for supporting NZVI.However, Fe@MIL-101 (Cr)
It is all made of coprecipitation preparation with nZVI Zn-MOF-74, NZVI is very likely only attached to MOF material surface, not
It can be coated among composite material by MOF narrow gap by stabilization.
Therefore, it is shell material that how to select, which has the MOFs of high adsorption capacity to Cr (VI), which kind of technology to expand shell material using
The duct of material, and how NZVI to be effectively encapsulated in inside shell material, so that the superior performance of composite material, it is right to improve its
The absorption property of environmental contaminants especially heavy metal is the technical issues of being worth research.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, for currently with MOF or NZVI technology
Deficiency present in treatment of heavy metal polluted water body provides one kind with nano zero valence iron (NZVI) as core, metal organic frame
(MOF) derived material is the preparation method of the novel core-shell material NZVI ZD of shell and rapidly and efficiently removes (VI) containing Cr using it
Waste water.The present invention increases the aperture of ZIF-67 shell using carbonization, and NZVI is encapsulated in porous shell, strengthens NZVI ZD and goes to remove water
The effect of middle Cr (VI).
In order to solve the above technical problems, the invention adopts the following technical scheme:
The preparation method of core-shell material NZVI@ZD, comprising the following steps:
(1) it weighs molysite and polyvinylpyrrolidone (PVP) is dissolved in the ethanol solution that volume fraction is 60%, in nitrogen item
Continued mechanical stirs under part, obtains anaerobic mixed liquor；It weighs sodium borohydride to be dissolved in deionized water, and drop by drop by it
It is added in above-mentioned anaerobic mixed liquor, whole process keeps nitrogen and mechanical agitation, NZVI crude product is obtained, with anhydrous second
Alcohol washs NZVI crude product, and magnet is dried in vacuo after separating and collecting, and obtains NZVI；
(2) salt solubility is weighed in methanol, after being completely dissolved, is dispersed NZVI in cobalt salt solution, and it is mixed to obtain NZVI/Co
Close liquid；It weighs organic ligand and is dissolved in methanol, be subsequently added in NZVI/Co mixed liquor, it is thick that standing obtains NZVI@ZIF-67
Product is washed with methanol, and magnet is dried in vacuo after separating and collecting, and obtains NZVI@ZIF-67；
(3) by NZVI@ZIF-67 material in tube furnace, lead to nitrogen calcining, obtain NZVI@ZD.
In the preparation method of above-mentioned core-shell material NZVI@ZD, it is preferred that in the step (1), the molysite is hydration
Iron chloride (FeCl3·6H2O), mechanical stirring carries out at room temperature, and the time of the stirring is 30min~35min, the vacuum
Dry temperature be 59~61 DEG C, vacuum drying time be 7.5~8.5h, the time persistently stirred be 30min~
35min, the ethanol washing number are 3~4 times.
In the preparation method of above-mentioned core-shell material NZVI@ZD, it is preferred that in the step (2), the cobalt salt is hydration
Cobalt nitrate (Co (NO3)3·6H2O), the dwell temperature is room temperature, and time of repose is 23~25h, the vacuum drying temperature
It is 59~61 DEG C, vacuum drying time is 7.5~8.5h, and the methanol washing times are 3~4 times.
In the preparation method of above-mentioned core-shell material NZVI@ZD, it is preferred that in the step (3), the calcination temperature is
795~805 DEG C, heating rate is 5~6 DEG C of min-1, calcination time is 120~130min.
As a general technical idea, the present invention also provides the preparation methods of above-mentioned core-shell material NZVI@ZD a kind of
Application of the NZVI@ZD obtained in processing heavy metal containing sewage.
In above-mentioned application, it is preferred that in the application, the heavy metal containing sewage is containing Cr (VI) sewage.
Compared with the prior art, the advantages of the present invention are as follows:
(1) the present invention provides the preparation methods of core-shell material NZVI@ZD a kind of.By in ZIF-67 raw material self assembling process
The modified NZVI of PVP is added, NZVI core is encapsulated in inside ZIF-67 shell, and is big by the duct that subsequent carbonisation expands shell
Small, whole preparation process is simple.
(2) NZVI@ZD caused by the preparation method of core-shell material NZVI@ZD of the present invention is in the absorption property to Cr (VI)
On be significantly improved.
Detailed description of the invention
The adsorbent that Fig. 1 is the embodiment of the present invention 1, comparative example 1, comparative example 2 synthesize imitates the absorption of Cr in solution (VI)
Fruit figure.
Isothermal of the adsorbent that Fig. 2 is the embodiment of the present invention 1, comparative example 1, comparative example 2 synthesize to Cr (VI) absorption property
Adsorb matched curve.
Isothermal of the adsorbent that Fig. 3 is the embodiment of the present invention 1, comparative example 1, comparative example 2 synthesize to Cr (VI) absorption property
Adsorb fitting parameter.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
It limits the scope of the invention.
Material employed in following embodiment and instrument are commercially available.
Embodiment 1:
A kind of preparation method of core-shell material NZVI@ZD of the invention, comprising the following steps:
(1) 1.45g FeCl is weighed3·6H2O and 50mg PVP is dissolved in 60mL 70% (v/v) ethanol solution, and logical nitrogen stirs
It mixes.By NaBH4(0.7g+20mL water) is added dropwise in solution, is dripped and is continued logical nitrogen gas stirring 30min.Use ethanol wash
Three times, it is centrifuged, 60 DEG C of vacuum drying 12h.Products therefrom is NZVI.
(2) 0.87g Co (NO is weighed3)3·6H2O and 0.0168g NZVI is dissolved in 30mL anhydrous methanol, ultrasound
5min obtains uniform mixed liquor；It weighs 0.98g methylimidazole MeIm to be dissolved in 10mL anhydrous methanol, be slowly added to
It states in mixed liquor, acquired solution is stood for 24 hours at room temperature, obtain NZVI@ZIF-67 crude product, washed with methanol, magnet point
From 60 DEG C of vacuum drying 8h after collection, NZVI@ZIF-67 is obtained.
(3) NZVI@ZIF-67 obtained by step (2) is transferred in tube furnace, maintaining nitrogen purge, with 5 DEG C/min rate liter
Temperature calcines 120min to 800 DEG C at this temperature, is naturally cooling to room temperature to get NZVI@ZD.
Comparative example 1:
A method of preparing ZIF-67 monomer, comprising the following steps:
(1) 0.87g Co (NO is weighed3)3·6H2O and 0.0168g NZVI is dissolved in 30mL anhydrous methanol, obtains Co
(NO3)3·6H2O solution.
(2) it weighs 0.98g methylimidazole MeIm to be dissolved in 10mL anhydrous methanol, obtains MeIm solution.
(3) MeIm solution is slowly added into Co (NO3)3·6H2O solution stands for 24 hours at room temperature, it is thick to obtain ZIF-67
Product is washed with methanol, and 60 DEG C of vacuum drying 8h after being collected by centrifugation obtain ZIF-67 monomer.
Comparative example 2:
A kind of to prepare using NZVI as core, ZIF-67 is the method for the core-shell material NZVI@ZIF-67 of shell, comprising the following steps:
(1) 1.45g FeCl is weighed3·6H2O and 50mg PVP is dissolved in 60mL 70% (v/v) ethanol solution, and logical nitrogen stirs
It mixes.By NaBH4(0.7g+20mL water) is added dropwise in solution, is dripped and is continued logical nitrogen gas stirring 30min.Use ethanol wash
Three times, it is centrifuged, 60 DEG C of vacuum drying 12h.Products therefrom is NZVI.
(2) 0.87g Co (NO is weighed3)3·6H2O and 0.0168g NZVI is dissolved in 30mL anhydrous methanol, ultrasound
5min obtains uniform mixed liquor；It weighs 0.98g methylimidazole MeIm to be dissolved in 10mL anhydrous methanol, be slowly added to
It states in mixed liquor, acquired solution is stood for 24 hours at room temperature, obtain NZVI@ZIF-67 crude product, washed with methanol, magnet point
From 60 DEG C of vacuum drying 8h after collection, NZVI@ZIF-67 is obtained.
The removal to heavy metal ion Cr (VI) in water of three kinds of embodiment products therefroms is tested:
Prepared serial adsorbent material in Example 1, comparative example 1 and 2 carries out absorption to the Cr (VI) in aqueous solution
It removes, method particularly includes:
Compound concentration gradient is 5,10,25,50,100,200,400,600mg L-1Cr (VI) solution.20mL is taken respectively
Cr (VI) solution adjusts pH=5.0 in 50mL conical flask.It is separately added into 0.01g embodiment 1, comparative example 1, institute in comparative example 2
The serial adsorbent material of generation.Then it is vibrated for 24 hours in constant temperature oscillator in 25 DEG C, revolving speed 170rpm.It, will after adsorption saturation
Solution is collected after crossing 0.22 μm of filter membrane, in surveying Cr (VI) concentration on ultraviolet specrophotometer, is absorbed optical wavelength and is set as 540nm.
As shown in Figure 1, the NZVI@ZD prepared by embodiment 1 is right compared with adsorbent synthesized by other two kinds of comparison schemes
Ratio 1 and 2 is in low concentration (50 and 100mg L-1) under experiment condition, adsorption saturation state is had reached, even and if embodiment 1 is dense
Degree is increased to 600mg L-1Saturation is not reached, and adsorbance increases with the increase of concentration, shows embodiment 1 to solution yet
Middle Cr VI has very superior absorption property compared with comparative example 1 and 2.
After series material carries out the fitting of adsorption isotherm model L-type by origin software to Cr (VI) Adsorption experimental results,
As a result see Fig. 2 and Fig. 3, the adsorbance for obtaining three kinds of adsorbents is respectively 226.5mg g-1(embodiment 1), 29.35mg g-1It is (right
Ratio 1), 36.53mg g-1(comparative example 2).
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention is disclosed as above with preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, in the case where not departing from Spirit Essence of the invention and technical solution, all using in the methods and techniques of the disclosure above
Appearance makes many possible changes and modifications or equivalent example modified to equivalent change to technical solution of the present invention.Therefore,
Anything that does not depart from the technical scheme of the invention are made to the above embodiment any simple according to the technical essence of the invention
Modification, equivalent replacement, equivalence changes and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (6)
1. the preparation method of core-shell material NZVI@ZD, comprising the following steps:
(1) it weighs molysite and polyvinylpyrrolidone (PVP) is dissolved in the ethanol solution that volume fraction is 60%, in nitrogen item
Continued mechanical stirs under part, obtains anaerobic mixed liquor；It weighs sodium borohydride to be dissolved in deionized water, and is dropwisely added
Into above-mentioned anaerobic mixed liquor, whole process keeps nitrogen and mechanical agitation, NZVI crude product is obtained, with dehydrated alcohol pair
NZVI crude product is washed, and magnet is dried in vacuo after separating and collecting, and obtains NZVI；
(2) salt solubility is weighed in methanol, after being completely dissolved, is dispersed NZVI in cobalt salt solution, and NZVI/Co mixing is obtained
Liquid；It weighs organic ligand and is dissolved in methanol, be subsequently added in NZVI/Co mixed liquor, standing obtains NZVI@ZIF-67 and slightly produces
Object is washed with methanol, and magnet is dried in vacuo after separating and collecting, and obtains NZVI@ZIF-67；
(3) by NZVI@ZIF-67 material in tube furnace, lead to nitrogen calcining, obtain NZVI@ZD.
2. the preparation method of core-shell material NZVI@ZD according to claim 1, which is characterized in that in the step (1),
The molysite is Ferric Chloride Hydrated, and mechanical stirring carries out at room temperature, and the time of the stirring is 30min~35min, described true
The dry temperature of sky is 59~61 DEG C, and vacuum drying time is 7.5~8.5h, the time persistently stirred be 30min~
35min, the ethanol washing number are 3~4 times.
3. the preparation method of core-shell material NZVI@ZD described according to claim 1~any one of 2, which is characterized in that described
In step (2), the cobalt salt is nitric hydrate cobalt, and the dwell temperature is room temperature, and time of repose is 23~25h, the vacuum
Dry temperature is 59~61 DEG C, and vacuum drying time is 7.5~8.5h, and the methanol washing times are 3~4 times.
4. the preparation method of core-shell material NZVI@ZD described in any one of claim 1 to 3, which is characterized in that described
In step (3), the calcination temperature is 795~805 DEG C, and heating rate is 5~6 DEG C of min-1, calcination time be 120~
130min。
5. NZVI@ZD made from a kind of preparation method such as any one of Claims 1 to 4 core-shell material NZVI@ZD is being handled
Application in heavy metal containing sewage.
6. application according to claim 5, which is characterized in that in the application, the heavy metal containing sewage is sewage containing Cr.
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| CN115555050A (en) * | 2022-10-09 | 2023-01-03 | 四川大学 | Preparation method and application of carbon-coated metal-organic framework material loaded nano zero-valent iron material |
| CN115555050B (en) * | 2022-10-09 | 2024-06-04 | 四川大学 | Preparation method and application of carbon-coated metal-organic framework material loaded nano zero-valent iron material |
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| CN111252879A (en) * | 2020-03-03 | 2020-06-09 | 天津师范大学 | Modified nano-iron and preparation method and application thereof |
| CN113275024A (en) * | 2021-06-07 | 2021-08-20 | 上海大学 | Preparation method and application of ZIF-67 derived wrapped S-Fe/Co @ C bimetallic catalyst |
| CN114212831A (en) * | 2021-06-24 | 2022-03-22 | 浙江工业大学 | Cobalt-modified zero-valent iron sulfide and preparation method and application thereof |
| CN114212831B (en) * | 2021-06-24 | 2024-03-01 | 浙江工业大学 | Cobalt-modified zero-valent iron sulfide and preparation method and application thereof |
| CN115382519A (en) * | 2022-04-26 | 2022-11-25 | 华侨大学 | Core-shell magnetic zirconium-based adsorbent and preparation method and application thereof |
| CN115555050A (en) * | 2022-10-09 | 2023-01-03 | 四川大学 | Preparation method and application of carbon-coated metal-organic framework material loaded nano zero-valent iron material |
| CN115555050B (en) * | 2022-10-09 | 2024-06-04 | 四川大学 | Preparation method and application of carbon-coated metal-organic framework material loaded nano zero-valent iron material |
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