CN113181898A - Catalyst for low-temperature degradation of low-density polyethylene and application thereof - Google Patents
Catalyst for low-temperature degradation of low-density polyethylene and application thereof Download PDFInfo
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- CN113181898A CN113181898A CN202110350759.2A CN202110350759A CN113181898A CN 113181898 A CN113181898 A CN 113181898A CN 202110350759 A CN202110350759 A CN 202110350759A CN 113181898 A CN113181898 A CN 113181898A
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- density polyethylene
- temperature
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- 239000003054 catalyst Substances 0.000 title claims abstract description 32
- 239000004702 low-density polyethylene Substances 0.000 title claims abstract description 32
- 229920001684 low density polyethylene Polymers 0.000 title claims abstract description 31
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 26
- 230000015556 catabolic process Effects 0.000 title claims abstract description 25
- 239000012378 ammonium molybdate tetrahydrate Substances 0.000 claims abstract description 10
- FIXLYHHVMHXSCP-UHFFFAOYSA-H azane;dihydroxy(dioxo)molybdenum;trioxomolybdenum;tetrahydrate Chemical compound N.N.N.N.N.N.O.O.O.O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O FIXLYHHVMHXSCP-UHFFFAOYSA-H 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 7
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 7
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- 239000012153 distilled water Substances 0.000 claims description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 5
- 238000006555 catalytic reaction Methods 0.000 claims description 4
- 230000000593 degrading effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910003149 α-MoO3 Inorganic materials 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 4
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Inorganic materials O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract 1
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000002070 nanowire Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 241000193830 Bacillus <bacterium> Species 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 108010029541 Laccase Proteins 0.000 description 1
- 241000589516 Pseudomonas Species 0.000 description 1
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229920000891 common polymer Polymers 0.000 description 1
- MOVRKLZUVNCBIP-RFZYENFJSA-N cortancyl Chemical compound C1CC2=CC(=O)C=C[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)COC(=O)C)(O)[C@@]1(C)CC2=O MOVRKLZUVNCBIP-RFZYENFJSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
Classifications
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/28—Molybdenum
-
- B01J35/23—
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/50—Partial depolymerisation
Abstract
The invention discloses a catalyst for low-temperature degradation of low-density polyethylene and application thereof, wherein the chemical formula of the catalyst is MoO3The preparation method belongs to an orthorhombic system and is characterized in that water is used as a solvent, ammonium molybdate tetrahydrate, polyethylene glycol and nitric acid are added under the stirring condition, and after hydrothermal reaction, the alpha-MoO can be prepared by centrifugal washing and drying3A catalyst. The preparation method of the catalyst is environment-friendly, simple, low in cost and pure in product, can well remove the pollution of low-density polyethylene at low temperature, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of polyethylene degradation catalysis, and particularly relates to a catalyst for low-temperature degradation of low-density polyethylene and application thereof.
Background
Low density polyethylene- [ CH2-CH2]nIs one of the most common polymer materials in daily life and has the largest output and use amount in the worldOne of the plastics is used in large quantities for the manufacture of plastic bags, plastic films, milk pail products, etc. Due to the structural characteristics of long chains and hydrophobic macromolecules of the low-density polyethylene, the low-density polyethylene plastic has a longer degradation period and is very slow in degradation process in a natural environment.
At present, the plastic degradation method at home and abroad has been reported as follows: a method for degrading polyethylene by using extracellular laccase of bacillus (CN 103980535B) is reported by Yangjun et al, but the degradation method by using the extracellular enzyme of the microorganism needs harsh conditions of pH, temperature and the like, so the application is limited; wanqiao et al obtained two kinds of fluorescent Pseudomonas and Pseudomonas aeruginosa (CN 107469269B) which can synergistically degrade polyethylene by adjusting the culture medium, but had the disadvantages of long culture period and long degradation time.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide alpha-MoO of low-temperature degradable low-density polyethylene3The catalyst can improve the degradation efficiency of the low-density polyethylene plastic and shorten the degradation time, and the preparation method is simple and easy to implement, low in cost and has obvious application prospects.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a catalyst for low-temperature degradation of low-density polyethylene is prepared by the following steps:
1) adding distilled water into a beaker, and adding ammonium molybdate tetrahydrate and polyethylene glycol serving as a surfactant under the stirring condition;
2) continuously adding nitric acid into the beaker, and stirring;
3) adding the mixed solution obtained in the step 2) into a polytetrafluoroethylene lining, carrying out constant-temperature hydrothermal reaction, then naturally cooling to room temperature, centrifuging, washing and drying to obtain a product, namely alpha-MoO3。
As a preferred technical scheme, in the step 1), the molar ratio of ammonium molybdate tetrahydrate to polyethylene glycol is 5: 1.
As a preferred technical scheme of the application, in the step 1), the ratio of ammonium molybdate tetrahydrate to distilled water is 1:30 mol/L.
As a preferred technical scheme of the application, in the step 2), the concentration of the nitric acid is 65-68wt%, and the ratio of ammonium molybdate tetrahydrate and nitric acid is 1:50 mol/L.
In a preferred embodiment of the present invention, in the step 2), the stirring time is 30 minutes.
As a preferred technical solution of the present application, in the step 3), the constant temperature hydrothermal reaction temperature is 160 ℃, and the reaction time is 24 hours.
The catalyst for degrading the low-density polyethylene at low temperature is applied to the field of catalytic degradation of the low-density polyethylene.
As a preferred technical scheme of the application, the application comprises the following steps: respectively weighing the catalyst and the low-density polyethylene plastic, uniformly mixing, adding into a beaker filled with distilled water, placing the beaker into a constant-temperature stirrer at 35 ℃, and carrying out catalytic reaction for 4 days.
As a preferable technical scheme of the application, the mass ratio of the catalyst to the low-density polyethylene plastic is 1: 0.25-2.
Has the advantages that:
alpha-MoO of the invention3The catalyst uses polyethylene glycol as a surfactant, is good in appearance, can improve the degradation efficiency of low-density polyethylene plastics and shorten the degradation time, and has the advantages of simple and easy preparation method, low cost and obvious application prospect.
Drawings
FIG. 1 is a view of α -MoO of example 13An X-ray diffraction pattern of the catalyst;
FIG. 2 is a view of α -MoO of example 13Scanning electron micrographs of the catalyst (the scale in the figure is 20 μm);
FIG. 3 is a view showing a-MoO of test example 13Comparison of Fourier infrared spectrum results of the catalyst after 4 days of catalytic degradation of low density polyethylene at 35 ℃.
Detailed Description
The present invention will be described in further detail with reference to examples. The reagents or instruments used are not indicated by manufacturers, and are regarded as conventional products which can be purchased in the market.
Example 1
Adding 1mmol of ammonium molybdate tetrahydrate and 0.2mmol of polyethylene glycol into a beaker containing 30mL of distilled water at room temperature, and stirring for 10 min; continuously adding 5ml of 65-68wt% nitric acid, and stirring for 30 min; transferring the mixed solution into a polytetrafluoroethylene lining, carrying out hydrothermal reaction at the constant temperature of 160 ℃ for 24 hours, washing, centrifuging and drying to obtain a product, namely alpha-MoO3。
XRD and SEM characterization was performed on the product of example 1.
As can be seen from FIG. 1, the product of example 1 is reacted with α -MoO3Standard card (JCPDS: 89-7112) was identical and the product prepared in example 1 was a phase pure α -MoO3A catalyst.
As can be seen from FIG. 2, the α -MoO of example 13The catalyst is in the shape of a nanowire, the length of the nanowire is 5-10 mu m, and the diameter of the nanowire is about 20-30 nm.
Test example 1
The alpha-MoO of example 1 was reacted3The catalyst is used for degrading suspended particle solution containing low-density polyethylene plastics, and comprises the following specific steps:
separately weighing alpha-MoO3The catalyst and 0.1g and 0.03g of low-density polyethylene plastic are mechanically stirred in a mortar to be uniformly mixed, the mixture is added into a beaker filled with 100mL of distilled water, the beaker is placed in a constant-temperature stirrer at 35 ℃ to carry out catalytic reaction for 4 days, and the functional groups of the substances before and after the reaction are detected by Fourier infrared spectroscopy, and the result is shown in figure 3.
FIG. 3 shows that the catalyzed low density polyethylene plastic has a new obvious characteristic peak at 908cm-1And 888cm-1The peak of vinyl and vinylidene is detected, and alpha-MoO can be seen3The catalyst realizes the mineralization and decomposition of the low-density polyethylene plastic at low temperature.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the invention in any way. The protection of the present invention is not limited to the above embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept and the scope of the appended claims is intended to be protected.
Claims (9)
1. A catalyst for degrading low-density polyethylene at low temperature is characterized in that: is prepared by the following steps:
1) adding distilled water into a beaker, and adding ammonium molybdate tetrahydrate and polyethylene glycol serving as a surfactant under the stirring condition;
2) continuously adding nitric acid into the beaker, and stirring;
3) adding the mixed solution obtained in the step 2) into a polytetrafluoroethylene lining, carrying out constant-temperature hydrothermal reaction, then naturally cooling to room temperature, centrifuging, washing and drying to obtain a product, namely alpha-MoO3。
2. The catalyst for low-temperature degradation of low-density polyethylene according to claim 1, wherein: in the step 1), the molar ratio of ammonium molybdate tetrahydrate to polyethylene glycol is 5: 1.
3. The catalyst for low-temperature degradation of low-density polyethylene according to claim 1, wherein: in the step 1), the ratio of ammonium molybdate tetrahydrate to distilled water is 1:30 mol/L.
4. The catalyst for low-temperature degradation of low-density polyethylene according to claim 1, wherein: in the step 2), the concentration of the nitric acid is 65-68wt%, and the ratio of ammonium molybdate tetrahydrate to nitric acid is 1:50 mol/L.
5. The catalyst for low-temperature degradation of low-density polyethylene according to claim 1, wherein: in the step 2), the stirring time is 30 minutes.
6. The catalyst for low-temperature degradation of low-density polyethylene according to claim 1, wherein: in the step 3), the constant-temperature hydrothermal reaction temperature is 160 ℃, and the reaction time is 24 hours.
7. The use of the catalyst for low-temperature degradation of low-density polyethylene according to claim 1 in the field of catalytic degradation of low-density polyethylene.
8. Use of a catalyst according to claim 7 in the field of catalytic degradation of low density polyethylene, characterized in that: the method comprises the following steps: respectively weighing the catalyst and the low-density polyethylene plastic, uniformly mixing, adding into a beaker filled with distilled water, placing the beaker into a constant-temperature stirrer at 35 ℃, and carrying out catalytic reaction for 4 days.
9. Use of a catalyst according to claim 8 in the field of catalytic degradation of low density polyethylene, characterized in that: the mass ratio of the catalyst to the low-density polyethylene plastic is 1: 0.25-2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350759.2A CN113181898A (en) | 2021-03-31 | 2021-03-31 | Catalyst for low-temperature degradation of low-density polyethylene and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110350759.2A CN113181898A (en) | 2021-03-31 | 2021-03-31 | Catalyst for low-temperature degradation of low-density polyethylene and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113750987A (en) * | 2021-09-16 | 2021-12-07 | 南京信息工程大学 | Quadrature phase MoO3Electrocatalyst and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190402A (en) * | 2014-08-13 | 2014-12-10 | 南京信息工程大学 | Cerium-doped catalyst material as well as preparation method and application thereof |
| CN105836802A (en) * | 2016-03-29 | 2016-08-10 | 河南师范大学 | MoO3 wet catalyst for degradation of dye wastewater and preparation method thereof |
| CN105944712A (en) * | 2016-05-23 | 2016-09-21 | 南京信息工程大学 | Preparation method of novel cerium sodium molybdate/molybdenum trioxide composite photocatalyst |
-
2021
- 2021-03-31 CN CN202110350759.2A patent/CN113181898A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190402A (en) * | 2014-08-13 | 2014-12-10 | 南京信息工程大学 | Cerium-doped catalyst material as well as preparation method and application thereof |
| CN105836802A (en) * | 2016-03-29 | 2016-08-10 | 河南师范大学 | MoO3 wet catalyst for degradation of dye wastewater and preparation method thereof |
| CN105944712A (en) * | 2016-05-23 | 2016-09-21 | 南京信息工程大学 | Preparation method of novel cerium sodium molybdate/molybdenum trioxide composite photocatalyst |
Non-Patent Citations (2)
| Title |
|---|
| KRISTEN E. HARRIS，等: "Degradation of PET Microplastics by Controlled Microbial & Photocatalytic, MoO3, Exposure", 《UNDERGRADUATE RESEARCH DAY STUDENT PROJECTS COLLECTION》 * |
| SHASHA ZHU，等: "Effect of the phase structure on the catalytic activity of MoO3 and potential application for indoor clearance", 《J. MATER. CHEM. C》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113750987A (en) * | 2021-09-16 | 2021-12-07 | 南京信息工程大学 | Quadrature phase MoO3Electrocatalyst and preparation method and application thereof |
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Application publication date: 20210730 |