Preparation method of super-hydrophobic bamboo and wood fiber fuel with high calorific value

Abstract

The invention relates to a preparation method of a super-hydrophobic high-calorific-value bamboo-wood fiber fuel, application of the super-hydrophobic high-calorific-value bamboo-wood fiber fuel as an adsorbent in removal of illegal cooking oil in sewage and high-calorific-value performance of the fuel, and belongs to the field of processing and application of natural polymers. The invention aims to provide the super-hydrophobic bamboo and wood fiber fuel with the high calorific value. Bamboo fibers are used as raw materials, a mixed solution of heptadecafluorodecyl trimethoxysilane, absolute ethyl alcohol and silicon dioxide is used as a reagent, and the bamboo fibers are modified to prepare the super-hydrophobic bamboo fiber material. The super-hydrophobic bamboo fiber material prepared by adopting the method has a hydrophobic and oil-absorbing structure and has good adsorption performance on swill-cooked dirty oil in sewage, the super-hydrophobic bamboo fiber after adsorbing grease is the super-hydrophobic bamboo fiber fuel with the high calorific value, and the super-hydrophobic bamboo fiber fuel is stable in structure, high in calorific value and capable of being recycled; and the material is an ecological good material.

Description

Technical Field

[0001] The invention belongs to the field of natural polymer processing and application, and relates to a method for preparing super-hydrophobic high-calorific value bamboo fiber fuel; it also relates to the application of the super-hydrophobic bamboo fiber material as an adsorbent in removing waste oil from waste water. Background Art

[0002] Food safety is an issue that we are very concerned about, among which the problem of waste oil is a very common problem in our lives. Waste oil can be divided into three categories: the first is waste oil in a narrow sense, which is the oil obtained by simple processing and refining of greasy floating materials in the sewer or leftovers and vegetables (commonly known as swill) in hotels and restaurants; the second is the oil produced after processing and refining of inferior pork, pig offal, and pig skin; the third is the oil used for frying food, which is reused or added with some new oil after being used more than a certain number of times. The main component of waste oil is still triglyceride, but in the refining process, animal and plant oils undergo a series of chemical changes such as rancidity, oxidation and decomposition after being contaminated, producing some substances such as aldehydes, ketones, lactones and peroxides with pungent odors, which are carcinogenic. This is not only a pollution to the environment, but also a great hazard to human health.

[0003] The method for processing waste oil at present mainly includes heating, crushing and screening, sand settling, grease treatment and three-phase separation, and then the chemical products of biodiesel, ethanol, lubricating oil, soap, etc. are made by chemical reaction, and the processing of global waste oil is mainly for making biodiesel.Wherein, grease treatment is the key of the present invention, by preparing a kind of super-hydrophobic fiber material, it is sprinkled in sewage, and then it is pulled out after absorbing waste oil therein.Utilize tool to squeeze out the waste oil absorbed, reach the purpose of reclaiming waste oil for reuse.

[0004] Bamboo fiber is a natural renewable resource widely distributed in nature. Since bamboo fiber molecules contain many hydrophilic hydroxyl groups, although it has certain adsorption properties for hydrophilic substances, it is precisely because of the large number of hydroxyl groups in the molecular structure that hydrogen bonds are widely formed between and within the molecular chains. This hydroxyl-covered structure affects the reaction activity and adsorption properties. Therefore, in order to achieve the expected adsorption effect, bamboo fiber needs to be modified. Heptafluorodecyl trimethoxysilane, silicon dioxide and anhydrous ethanol are mixed into a solution to modify the bamboo fiber. This has the advantages of good selectivity, strong adsorption capacity, wide source of raw materials, and low cost. In summary, the modified super-hydrophobic bamboo fiber material has both adsorption capacity and is easier to regenerate than adsorption resin, and has high stability. Combined with the current research status, the super-hydrophobic material prepared by modified bamboo fiber can not only have a good water absorption effect, but also adsorb oil in sewage. The present invention is based on bamboo fiber, a widely available renewable biomass resource, and modifies it to obtain a super-hydrophobic material having a three-dimensional nano-mesoporous network structure, a stable structure, high oil adsorption efficiency, large adsorption capacity, simple preparation process, and low cost. It can not only be used for sewage treatment, but also can be used as a high calorific value fuel, and is a very environmentally friendly material. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing super-hydrophobic high calorific value bamboo fiber fuel. The prepared super-hydrophobic bamboo fiber material has a three-dimensional nano-mesoporous network structure, a high porosity, and a stable structure.

[0006] Another object of the present invention is to provide the use of the super-hydrophobic bamboo fiber material as an adsorbent for removing waste cooking oil from sewage. The prepared adsorbent material has high adsorption efficiency for oily pollutants, large adsorption capacity, high combustion calorific value, and is recyclable, naturally degradable, and green and environmentally friendly.

[0007] The technical solution adopted by the present invention is: a method for preparing super-hydrophobic high calorific value bamboo fiber fuel, comprising the following steps:

[0008] (1) Grind bamboo into 10-mesh bamboo powder, take 30 g of bamboo powder as a sample and put it in a beaker.

[0009] (2) The four bamboo powder samples obtained in step (1) were placed in a mixed solution of heptadecafluorodecyltrimethoxysilane, silicon dioxide and anhydrous ethanol, and immersed for reaction for 2 hours.

[0010] (3) filtering the bamboo powder sample obtained in step (2) through a filter to remove the solution, and drying the obtained bamboo powder in a drying machine.

[0011] (4) Grinding the dried bamboo powder obtained in step (3) in a grinder.

[0012] (5) immersing the super-hydrophobic bamboo fiber obtained in step (4) in grease, and then placing it in a press to squeeze out excess grease.

[0013] In the above technical solution,

[0014] The bamboo powder in the step (1) is bamboo powder of 10 mesh size.

[0015] The mixed solution in step (2) is prepared by first mixing heptadecafluorodecyltrimethoxysilane and anhydrous ethanol in a ratio of 1:100, and then mixing silicon dioxide with the mixture in a ratio of 0.5:100, 1:100, 2:100, and 3:100, respectively.

[0016] The mixed solution in step (2) needs to be mixed evenly using an ultrasonic cell disruptor during preparation.

[0017] The solution filtered out in step (2) refers to the solution in the container after the reaction, and does not need to be rinsed with water, but only needs to be dried.

[0018] The bamboo powder processed in step (4) is stirred with water at different concentrations, and neither absorbs water nor dissolves in water.

[0019] The beneficial effects of the present invention are:

[0020] 1. The preparation method of the adsorption material provided by the present invention uses natural renewable biomass resources - bamboo fiber as raw material, giving full play to the inherent characteristics of bamboo fiber, with wide sources, low cost, renewable and biodegradable, and green and environmentally friendly.

[0021] 2. The super-hydrophobic bamboo fiber material prepared by the present invention has a three-dimensional porous network structure with a pore size of nano-mesopores. Compared with adsorption materials prepared by other technologies, it has higher structural stability, can be recycled and reused, and greatly reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The scanning electron microscope images of super-hydrophobic high calorific value bamboo fiber fuel prepared by different treatment methods of bamboo fiber (a. No treatment b. Treatment with only heptadecafluorodecyltrimethoxysilane c. Treatment with heptadecafluorodecyltrimethoxysilane and silicon dioxide);

[0023] Figure 2 The contact angle diagram of bamboo fiber before and after being treated with a mixed solution of heptadecafluorodecyltrimethoxysilane and silicon dioxide (a. untreated b. treated);

[0024] Figure 3 This is an infrared graph of bamboo fiber before and after treatment with a mixed solution of heptadecafluorodecyltrimethoxysilane and silicon dioxide (a. untreated b. treated). DETAILED DESCRIPTION

[0025] The following will be combined with the drawings, technical process steps, specific implementation conditions and materials in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The preparation of the super-hydrophobic high calorific value bamboo fiber fuel and its high calorific value performance are further described below by using specific examples. It should be emphasized that the biomass bamboo fiber raw material used in the present invention is bamboo powder with a size of 10 mesh.

[0027] Embodiment 1

[0028] 1. Preparation of super-hydrophobic high calorific value bamboo fiber fuel

[0029] Take 30g of 10-mesh bamboo powder sample in a beaker for later use. Weigh 0.5g of 17-fluorodecyl trimethoxysilane and 49.5g of anhydrous ethanol, and put them into an ultrasonic cell crusher to mix evenly. Then measure 0.5g, 1g, and 1.5g of silicon dioxide respectively, add the above-configured 17-fluorodecyl trimethoxysilane and anhydrous ethanol mixed solution respectively, put them into an ultrasonic cell crusher again to mix evenly, pour the solutions of different concentrations into the prepared bamboo powder samples respectively, stir to mix, and then react for 2h. After drying and crushing, immerse in oil, and then put it into a press to squeeze out excess oil. The final product is super-hydrophobic high calorific value bamboo fiber fuel.

[0030] 2. Determination of calorific value performance

[0031] The calorific value of 1g of ordinary bamboo powder and 1g of super-hydrophobic high calorific value bamboo fiber fuel after combustion was measured. The calorific value of 1g of ordinary bamboo powder after combustion was measured to be 19235.12Qad, and the calorific value of 1g of super-hydrophobic high calorific value bamboo fiber fuel after combustion was 26896.36Qad.

[0032] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: The steps include: (1) Grind bamboo into 10-mesh bamboo powder, take 30 g of bamboo powder as a sample and put it in a beaker; (2) placing the four bamboo powder samples obtained in step (1) into a mixed solution of heptadecafluorodecyltrimethoxysilane, silicon dioxide and anhydrous ethanol, and soaking and reacting for 2 hours; (3) filtering the bamboo powder sample obtained in step (2) through a filter to remove the solution, and drying the obtained bamboo powder in a dryer; (4) Grinding the dried bamboo powder obtained in step (3) in a grinder to obtain the powder.

2. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: The bamboo powder described in step (1) is bamboo powder of 10 mesh size.

3. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: The mixed solution in step (2) is prepared by first mixing heptadecafluorodecyltrimethoxysilane and anhydrous ethanol in a ratio of 1:100, and then mixing silicon dioxide with the mixture in a ratio of 0.5:100, 1:100, 2:100, and 3:100, respectively.

4. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: The mixed solution described in step (2) needs to be mixed evenly using an ultrasonic cell disruptor during preparation.

5. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: The filtered solution in step (2) refers to the solution in the container after the reaction, and does not need to be rinsed with water, but only needs to be dried.

6. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: The bamboo powder processed in step (4) is stirred with water at different concentrations, and neither absorbs water nor dissolves in water.

7. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: Using the method in step (2), first mix heptadecafluorodecyltrimethoxysilane and anhydrous ethanol in a ratio of 0.2:100, and then mix silicon dioxide with it in a ratio of 0.5:

100. According to the same method as above, recycled waste oil super-hydrophobic bamboo fiber is prepared. After testing, it is found that it also has good hydrophobic properties.

8. A method for preparing super-hydrophobic high calorific value bamboo fiber fuel, characterized in that: The super-hydrophobic bamboo fibers of different concentrations prepared above are placed in sewage containing waste oil, and then the bamboo powder absorbed with oil is fished out and placed in a manual press to squeeze out the absorbed oil. The remaining solid oil residue is a high calorific value fuel.

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