CN112642404A - Degradable adsorbent and preparation method and application thereof - Google Patents
Degradable adsorbent and preparation method and application thereof Download PDFInfo
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- 239000003463 adsorbent Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 108010010803 Gelatin Proteins 0.000 claims abstract description 26
- 229920000159 gelatin Polymers 0.000 claims abstract description 26
- 239000008273 gelatin Substances 0.000 claims abstract description 26
- 235000019322 gelatine Nutrition 0.000 claims abstract description 26
- 235000011852 gelatine desserts Nutrition 0.000 claims abstract description 26
- 239000000243 solution Substances 0.000 claims abstract description 23
- 239000003960 organic solvent Substances 0.000 claims abstract description 9
- 238000009777 vacuum freeze-drying Methods 0.000 claims abstract description 9
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 8
- 239000000839 emulsion Substances 0.000 claims abstract description 8
- 239000007864 aqueous solution Substances 0.000 claims abstract description 7
- 230000001804 emulsifying effect Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 10
- 241000609240 Ambelania acida Species 0.000 claims description 9
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 239000010905 bagasse Substances 0.000 claims description 9
- 235000007201 Saccharum officinarum Nutrition 0.000 claims description 7
- 240000000111 Saccharum officinarum Species 0.000 claims description 7
- 238000004042 decolorization Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 6
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 6
- 229940057995 liquid paraffin Drugs 0.000 claims description 4
- -1 sorbitan fatty acid ester Chemical class 0.000 claims description 4
- XZIIFPSPUDAGJM-UHFFFAOYSA-N 6-chloro-2-n,2-n-diethylpyrimidine-2,4-diamine Chemical compound CCN(CC)C1=NC(N)=CC(Cl)=N1 XZIIFPSPUDAGJM-UHFFFAOYSA-N 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- 229940035044 sorbitan monolaurate Drugs 0.000 claims description 3
- 229930006000 Sucrose Natural products 0.000 abstract description 9
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 abstract description 9
- 229960004793 sucrose Drugs 0.000 abstract description 8
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000004005 microsphere Substances 0.000 description 7
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical group CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 235000013336 milk Nutrition 0.000 description 3
- 239000008267 milk Substances 0.000 description 3
- 210000004080 milk Anatomy 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000002336 sorption--desorption measurement Methods 0.000 description 2
- 239000005720 sucrose Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 229920001213 Polysorbate 20 Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- 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
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- 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
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—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 form
- B01J20/28016—Particle form
- B01J20/28021—Hollow particles, e.g. hollow spheres, microspheres or cenospheres
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B20/00—Purification of sugar juices
- C13B20/12—Purification of sugar juices using adsorption agents, e.g. active carbon
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B20/00—Purification of sugar juices
- C13B20/12—Purification of sugar juices using adsorption agents, e.g. active carbon
- C13B20/123—Inorganic agents, e.g. active carbon
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B20/00—Purification of sugar juices
- C13B20/12—Purification of sugar juices using adsorption agents, e.g. active carbon
- C13B20/126—Organic agents, e.g. polyelectrolytes
-
- 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
- B01J2220/46—Materials comprising a mixture of inorganic and organic materials
-
- 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
-
- 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
- B01J2220/4856—Proteins, DNA
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Electrochemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a preparation method of a degradable adsorbent, which comprises the following steps: uniformly dispersing activated carbon in a gelatin aqueous solution to obtain a solution A, uniformly mixing and emulsifying the solution A, an organic solvent and a surfactant to obtain an emulsion, then solidifying by using a cross-linking agent, carrying out solid-liquid separation, and carrying out vacuum freeze drying to obtain the degradable adsorbent. The invention also discloses a degradable adsorbent which is prepared according to the preparation method of the degradable adsorbent. The invention also discloses application of the degradable adsorbent in impurity removal and decoloration of cane sugar liquid. The invention has good adsorption performance, can be repeatedly used, can be degraded and does not pollute the environment.
Description
Technical Field
The invention relates to the technical field of adsorbents, and particularly relates to a degradable adsorbent and a preparation method and application thereof.
Background
Sucrose is the main ingredient of sugar. Is widely applied to various industries, in particular to food and pharmaceutic adjuvant. In the process of sucrose preparation, materials such as cane juice, syrup and the like are often required to be clarified.
At present, a cane sugar factory usually adopts a sulfurous acid method clarification production process, calcium sulfite generated by reaction of sulfur dioxide and lime milk is used as a main clarifying agent and a decoloring agent, and produced white sugar has the problem of residual sulfur and cannot meet the requirements of medicines and foods. In addition, in the process of making sugar from cane sugar, a large amount of bagasse is generated, and the accumulation and the waste of the bagasse pollute the environment.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a degradable adsorbent and a preparation method and application thereof.
The invention provides a preparation method of a degradable adsorbent, which comprises the following steps: uniformly dispersing activated carbon in a gelatin aqueous solution to obtain a solution A, uniformly mixing and emulsifying the solution A, an organic solvent and a surfactant to obtain an emulsion, then solidifying by using a cross-linking agent, carrying out solid-liquid separation, and carrying out vacuum freeze drying to obtain the degradable adsorbent.
Preferably, the particle size of the activated carbon is less than or equal to 3 μm.
Preferably, the activated carbon is activated carbon prepared from sugar cane bagasse.
The preparation method of the activated carbon can be prepared according to the preparation method of the conventional biomass activated carbon in the field.
Preferably, the weight ratio of the activated carbon to the gelatin is 0.06-0.08: 1.
Preferably, the volume ratio of the solution A to the organic solvent is 12.5-20: 80.
Preferably, the volume weight ratio of the organic solvent to the surfactant is 80ml:0.1-0.3 g.
Preferably, the weight ratio of gelatin to cross-linking agent is 1: 0.15-0.2.
Preferably, the mass fraction of the aqueous gelatin solution is 5-8 wt%.
Preferably, curing is carried out at room temperature for 2.5-3 h.
Preferably, the temperature of the vacuum freeze-drying is from-15 to-10 ℃.
Preferably, the organic solvent is at least one of ethyl acetate, toluene and liquid paraffin.
Preferably, the surfactant is at least one of sorbitan fatty acid ester and sorbitan monolaurate polyoxyethylene ether.
The sorbitan fatty acid ester can be span 80, and the sorbitan monolaurate polyoxyethylene ether can be Tween 20.
Preferably, the cross-linking agent is at least one of formaldehyde and glutaraldehyde.
The water is deionized water.
The invention also provides a degradable adsorbent which is prepared according to the preparation method of the degradable adsorbent.
The invention also provides application of the degradable adsorbent in impurity removal and decoloration of cane sugar liquid.
Has the advantages that:
according to the invention, a gelatin aqueous solution and activated carbon with a proper particle size are uniformly mixed, then an emulsion is prepared, and a crosslinking agent is used for crosslinking and curing to obtain gelatin microspheres, wherein the gelatin molecular chains contain abundant amino, carboxyl and hydroxyl groups, and have a certain adsorption property, the activated carbon is introduced into the gelatin microspheres, so that the surfaces of the gelatin microspheres are in a rough porous state, the adsorption property is greatly improved, and the microspheres have a crosslinking network and are matched with the porous state of the activated carbon through freeze drying, so that the adsorption property of the gelatin microsphere is further improved; in addition, the gelatin is spheroidized, so that the problem that the gelatin is easy to swell when meeting water is solved, and the stability of the adsorption performance is improved, so that the gelatin can be repeatedly utilized; the gelatin can be naturally degraded, so that the environment is not polluted; the bagasse is selected to prepare the activated carbon, so that the problem that the residual bagasse easily pollutes the environment in the sugar preparation process can be solved, and the raw material cost can be reduced. The inventor surprisingly discovers that the method can well remove impurities and pigments in the cane sugar solution, desalt and decolor and solve the problem of residual sulfur.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation method of a degradable adsorbent comprises the following steps: adding 0.06g of activated carbon (prepared from bagasse) with particle size less than or equal to 3 μm into 20ml of gelatin water solution with mass fraction of 5 wt%, ultrasonically dispersing uniformly to obtain solution A,
adding 20ml of the solution A and 0.1g of span 80 into 80ml of ethyl acetate, uniformly mixing and emulsifying for 2h to obtain an emulsion, then dropwise adding 0.2g of glutaraldehyde, curing for 2.5h at room temperature, filtering, sequentially washing for 4 times by using ethanol and water, and then carrying out vacuum freeze drying at-10 ℃ to obtain the degradable adsorbent with the average particle size of 61 mu m.
Example 2
A preparation method of a degradable adsorbent comprises the following steps: adding 0.08g of activated carbon (activated carbon prepared from bagasse) with the particle size of less than or equal to 3 mu m into 12.5ml of gelatin aqueous solution with the mass fraction of 8 wt%, performing ultrasonic dispersion uniformly to obtain solution A,
adding 12.5ml of the solution A and 0.3g of span 80 into 80ml of toluene, uniformly mixing and emulsifying for 2h to obtain an emulsion, then dropwise adding 0.15g of glutaraldehyde, curing for 3h at room temperature, filtering, sequentially washing for 4 times by using ethanol and water, and then carrying out vacuum freeze drying at-15 ℃ to obtain the degradable adsorbent with the average particle size of 70 mu m.
Example 3
A preparation method of a degradable adsorbent comprises the following steps: adding 0.07g of activated carbon (activated carbon prepared from bagasse) with particle size less than or equal to 3 μm into 16ml of gelatin water solution with mass fraction of 6.5 wt%, ultrasonically dispersing uniformly to obtain solution A,
adding 16ml of the solution A and 0.2g of span 80 into 80ml of liquid paraffin, uniformly mixing and emulsifying for 2h to obtain an emulsion, then dropwise adding 0.17g of glutaraldehyde, curing for 2.8h at room temperature, filtering, sequentially washing for 4 times by using ethanol and water, and then carrying out vacuum freeze drying at-13 ℃ to obtain the degradable adsorbent with the average particle size of 65 microns.
Comparative example 1
The preparation method of the gelatin microsphere comprises the following steps: adding 16ml of gelatin aqueous solution with the mass fraction of 6.5 wt% and 0.2g of span 80 into 80ml of liquid paraffin, uniformly mixing and emulsifying for 2h to obtain emulsion, then dropwise adding 0.17g of glutaraldehyde, curing for 2.8h at room temperature, filtering, washing with ethanol and water for 4 times in sequence, and then carrying out vacuum freeze drying at-13 ℃ to obtain the gelatin-containing nano-particles with the average particle size of 50 microns.
Comparative example 2
The same as in example 3.
Experiment 1
Sieving the sugarcane mixed juice with 200 mesh sieve, adding phosphoric acid (with concentration of 300mg/L), adjusting pH to 6.6 with lime milk, dividing into 6 parts (each part is 100 ml),
heating 5 parts of the mixture to 50 ℃, adding the mixture into each of examples 1-3 and comparative examples 1-2 (the mass fractions of the examples 1-3 and the comparative examples 1-2 are 2 wt%), respectively marking the mixture as an experimental group 1-3 and a control group 1-2, adjusting the pH value to 7.0 by using lime milk, heating the mixture to 90 ℃, adding polyacrylamide (the concentration of each group is 2mg/L), preserving heat, settling, and performing solid-liquid separation to obtain clear juice;
the 6 th part was purged with 20ml of SO2(marked as a control group 3), heating to 90 ℃, adding polyacrylamide (the concentration is 2mg/L), preserving heat, settling, and carrying out solid-liquid separation to obtain clear juice.
The purity difference Δ G.P and the decolorization ratio of the mixed juice and the clear juice were measured according to "chemical management and analysis method for sugar production from sugar cane", and the results are shown in table 1.
Δ G.P-gravity purity of clear juice-gravity purity of mixed juice.
Decolorization rate (IU)Clear juice-IUMixed juice) IU of the juice mixture 100%, wherein color values IU were detected at 420 nm.
TABLE 1 test results
| Grouping | The purity is poor% | Decolorization ratio% |
| Experimental group 1 | 2.7 | 73 |
| Experimental group 2 | 2.7 | 75 |
| Experimental group 3 | 2.8 | 74 |
| Control group 1 | 0.8 | 40 |
| Control group 2 | 0.4 | 28 |
| Control group 3 | 1.3 | 50 |
As can be seen from Table 1, the purity of the sugarcane mixed juice and the clear juice treated by the method is poor, the decolorization rate of the sugarcane mixed juice and the clear juice is superior to that of the single gelatin microsphere, the single activated carbon and the single sulfurous acid method, and the problem of residual sulfur does not exist; the method can well remove impurities and pigments in the cane sugar solution.
Experiment 2
The adsorbent prepared in example 3 was treated according to the method of experiment 1 to obtain clear juice; after 3 times of adsorption-desorption cycles, the purity difference and the decolorization rate of the clear juice obtained each time are examined, and the results are shown in table 2.
The desorption treatment method comprises the following steps: adding the used adsorbent into 5g/L sodium hydroxide solution, and oscillating at 20-25 deg.C for 40 min.
TABLE 2 cyclability
As can be seen from the above table: after 3 times of adsorption-desorption cycles, the purity difference and the decolorization rate of the clear juice are superior to those of a sulfurous acid method (such as data of a control group 3 in experiment 1), and the invention can be repeatedly used.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The preparation method of the degradable adsorbent is characterized by comprising the following steps: uniformly dispersing activated carbon in a gelatin aqueous solution to obtain a solution A, uniformly mixing and emulsifying the solution A, an organic solvent and a surfactant to obtain an emulsion, then solidifying by using a cross-linking agent, carrying out solid-liquid separation, and carrying out vacuum freeze drying to obtain the degradable adsorbent.
2. The method for preparing a degradable adsorbent according to claim 1, wherein the particle size of the activated carbon is less than or equal to 3 μm; preferably, the activated carbon is activated carbon prepared from sugar cane bagasse.
3. The process for preparing a degradable adsorbent according to claim 1 or 2, wherein the weight ratio of the activated carbon to the gelatin is 0.06-0.08: 1.
4. The process for preparing a degradable adsorbent according to any one of claims 1 to 3, wherein the volume ratio of the solution A to the organic solvent is 12.5 to 20: 80; preferably, the volume weight ratio of the organic solvent to the surfactant is 80ml:0.1-0.3 g; preferably, the weight ratio of gelatin to cross-linking agent is 1: 0.15-0.2.
5. The process for preparing a degradable adsorbent according to any one of claims 1 to 4, wherein the mass fraction of the gelatin aqueous solution is 5 to 8 wt%.
6. Process for the preparation of a degradable adsorbent according to any of claims 1 to 5, characterized in that curing is carried out at room temperature for 2.5 to 3 h.
7. The process for preparing a degradable adsorbent according to any one of claims 1 to 6, wherein the temperature of vacuum freeze-drying is from-15 to-10 ℃.
8. The method for preparing the degradable adsorbent according to any one of claims 1 to 7, wherein the organic solvent is at least one of ethyl acetate, toluene, liquid paraffin; preferably, the surfactant is at least one of sorbitan fatty acid ester and sorbitan monolaurate polyoxyethylene ether; preferably, the cross-linking agent is at least one of formaldehyde and glutaraldehyde.
9. A degradable adsorbent, which is obtained by the method for producing a degradable adsorbent according to any one of claims 1 to 8.
10. Use of the degradable adsorbent according to claim 9 in the impurity removal and color removal of a sugar cane solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011381180.4A CN112642404A (en) | 2020-12-01 | 2020-12-01 | Degradable adsorbent and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011381180.4A CN112642404A (en) | 2020-12-01 | 2020-12-01 | Degradable adsorbent and preparation method and application thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR777364A (en) * | 1934-08-06 | 1935-02-18 | Structural activated carbon and process for making it | |
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