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CN-121988284-A - Adsorption material for treating industrial waste gas dichloromethane and preparation method thereof

CN121988284ACN 121988284 ACN121988284 ACN 121988284ACN-121988284-A

Abstract

The invention provides an adsorption material for treating industrial waste gas dichloromethane and a preparation method thereof, belonging to the technical field of adsorption materials; the preparation method comprises the steps of preparing a carbon fiber/activated carbon compound, preparing composite sol and mixing, wherein the step of preparing the composite sol comprises the steps of adding tetrabutyl titanate and deionized water into absolute ethyl alcohol, adding a dilute nitric acid solution to adjust the pH to 2.5-3.0, stirring for 1.5-2.0h at room temperature, adding urea and zirconium nitrate, raising the temperature to 55-60 ℃, preserving heat and stirring for 1.2-1.5h, reducing the temperature to room temperature, adding polyethylene glycol 4000, and continuing stirring for 35-40min to obtain the composite sol.

Inventors

  • LIU YUHUI
  • YU LIANFANG
  • XU YONGSHENG
  • WANG GUOFENG
  • JIN YONGMING
  • SUN YUANWEI
  • YANG FENGJIE
  • WANG LIPING
  • LI YUCHENG
  • ZHENG SHANSHAN

Assignees

  • 山东默锐环境产业股份有限公司

Dates

Publication Date
20260508
Application Date
20260126

Claims (9)

  1. 1. The preparation method of the adsorption material for treating the industrial waste gas dichloromethane is characterized by comprising the steps of preparing a carbon fiber/activated carbon compound, preparing a composite sol and mixing; the step of preparing the carbon fiber/activated carbon composite comprises the steps of carbon fiber pretreatment, activated carbon pretreatment and compounding; The carbon fiber pretreatment step comprises the steps of putting carbon fibers into nitric acid solution, stirring, drying, adding into thionyl chloride, carrying out heat preservation and reflux for 3.0-4.0h at 72-77 ℃, and carrying out reduced pressure distillation to obtain pretreated carbon fibers; The activated carbon pretreatment step comprises the steps of immersing activated carbon in phytic acid solution to obtain immersed activated carbon, placing the immersed activated carbon in ethanol solution, adding a kH550 silane coupling agent, and performing ultrasonic dispersion at 65-70 ℃ for 1.5-2.0h to obtain pretreated activated carbon; The compounding step is that pretreated activated carbon is added into N, N-dimethylformamide, stirred uniformly, added into pretreated carbon fiber solution and stirred for 6.5 to 7.5 hours at 75 to 85 ℃ to obtain carbon fiber/activated carbon compound; the preparation method of the composite sol comprises the steps of adding tetrabutyl titanate and deionized water into absolute ethyl alcohol, adding a dilute nitric acid solution to adjust the pH to 2.5-3.0, stirring at room temperature for 1.5-2.0h, adding urea and zirconium nitrate, raising the temperature to 55-60 ℃, keeping the temperature and stirring for 1.2-1.5h, reducing the temperature to room temperature, adding polyethylene glycol 4000, and continuing stirring for 35-40min to obtain the composite sol.
  2. 2. The method for preparing an adsorption material for treating industrial waste gas methylene chloride according to claim 1, wherein, In the carbon fiber pretreatment step, the length of the carbon fiber is 30-50 mu m, and the diameter is 200-300nm; The mass concentration of the nitric acid solution is 65-68%; The mass ratio of the carbon fiber to the nitric acid solution to the thionyl chloride is 10:80-85:50-56.
  3. 3. The method for preparing an adsorption material for treating industrial waste gas methylene chloride according to claim 1, wherein, In the step of pretreatment of the activated carbon, the mass ratio of the impregnated activated carbon to the ethanol solution to the kH550 silane coupling agent is 10:100-110:1.2-1.5; the mass concentration of the ethanol solution is 65-70%.
  4. 4. The method for preparing an adsorption material for treating industrial waste gas methylene chloride according to claim 1, wherein, The mass ratio of the activated carbon to the phytic acid solution is 10:80-100; the particle size of the activated carbon is 150-180nm; The mass concentration of the phytic acid solution is 5-6%.
  5. 5. The method for preparing an adsorption material for treating industrial waste gas methylene chloride according to claim 1, wherein, In the compounding step, the mass ratio of the N, N-dimethylformamide to the pretreated activated carbon to the pretreated carbon fiber solution is 300:16-20:65-67.
  6. 6. The method for preparing an adsorbent material for treating industrial waste gas dichloromethane according to claim 5, wherein, In the pretreated carbon fiber solution, the mass ratio of N, N-dimethylformamide to pretreated fibers is 60:5-7.
  7. 7. The method for preparing an adsorption material for treating industrial waste gas methylene chloride according to claim 1, wherein, In the step of preparing the composite sol, the volume and mass ratio of the absolute ethyl alcohol, the tetrabutyl titanate, the deionized water, the urea, the zirconium nitrate and the polyethylene glycol 4000 is 80mL:8.0-9.0mL:7.5-8.5mL:2.4-2.6g:1.0-1.2g:0.8-1.1g; The mass concentration of the dilute nitric acid solution is 5-8%.
  8. 8. The method for preparing an adsorption material for treating industrial waste gas methylene chloride according to claim 1, wherein, Adding the carbon fiber/activated carbon composite into composite sol for ultrasonic dispersion, controlling the ultrasonic time to be 35-40min, controlling the ultrasonic power to be 280-300W, controlling the ultrasonic frequency to be 42-45kHz, standing at room temperature for 2.5-3.0h after the ultrasonic treatment is finished, drying at 80-85 ℃ for 9-10h, transferring into a muffle furnace, raising the temperature to 450-480 ℃ at a rate of 4.0-5.0 ℃ per min, preserving heat and roasting for 2.0-2.5h, and naturally cooling to room temperature to obtain the adsorption material; the mass ratio of the carbon fiber/activated carbon composite to the composite sol is 15-20:100.
  9. 9. An adsorbent material for treating industrial waste gas methylene chloride, which is produced by the production method according to any one of claims 1 to 8.

Description

Adsorption material for treating industrial waste gas dichloromethane and preparation method thereof Technical Field The invention belongs to the technical field of adsorption materials, and particularly relates to an adsorption material for treating industrial waste gas dichloromethane and a preparation method thereof. Background Dichloromethane is a common volatile organic compound in industrial production, and is widely used in the fields of paint, adhesives, medical intermediates and the like; However, the emission of methylene dichloride is seriously harmful to human health and ecological environment, the methylene dichloride easily enters the human body through respiratory tracts and skin, short-term contact stimulates eyes, noses and respiratory tracts to cause symptoms such as dizziness, headache, nausea and the like, long-term contact damages organs such as livers, kidneys and even central nervous systems, the methylene dichloride is listed as a class 2A cancerogenic substance by the international cancer research institution of world health organization, in addition, the methylene dichloride can exist stably in the atmosphere for 6-12 months, the methylene dichloride discharged into the atmosphere is one of precursors for forming photochemical smog and fine particles, the greenhouse effect is further aggravated, the methylene dichloride is difficult to degrade naturally after penetrating into soil or water, the methylene dichloride is enriched in the organism, and the ecological chain balance is destroyed. It can be seen that dichloromethane poses a serious threat to the environment and public health, and therefore, efficient removal of dichloromethane from industrial waste gas has become a challenge to be solved. At present, the method for treating the dichloromethane waste gas mainly comprises a combustion method, an absorption method and an adsorption method, wherein the combustion method mainly decomposes the dichloromethane at high temperature, has high energy consumption and is easy to produce secondary pollutants, and the absorption method mainly absorbs the dichloromethane by an organic solvent or an aqueous solution, but has high solvent regeneration difficulty and high cost, and also easily causes solvent leakage so as to pollute the ecological environment and human health; The adsorption method adopts porous materials to adsorb dichloromethane, mainly utilizes the specific surface area and surface active sites of the porous materials, has simple operation, low energy consumption, no secondary pollution and wide applicable concentration range, and is a mainstream technology for removing dichloromethane in the current industrial waste gas. The adsorption method of the adsorption material is very important, and the components such as the activated carbon, the carbon fiber and the like are the most commonly used adsorption material at present because the components have huge specific surface area and rich pore structures; The single activated carbon-based adsorption material has limited adsorption capacity, is easy to quickly saturate under high-concentration dichlorohexane, has single surface active site, has poor selectivity to polar dichloromethane and quick performance decay, has higher cost, has weaker interfacial binding force when being compounded with other materials, and is easy to fall off, thereby influencing the stability of adsorption performance; The metal oxide such as titanium dioxide is loaded on the surface of the activated carbon or carbon fiber by a sol-gel method, but the metal oxide is easy to agglomerate, uneven in loading, poor in combination of the metal oxide and the carbon material, and poor in ageing resistance, and in a long-term ageing environment, the adsorption capacity of the adsorption material is obviously reduced, the regeneration performance is poor, and the service life is further shortened. Therefore, the adsorption material for treating industrial waste gas dichloromethane and the preparation method thereof are provided, the adsorption capacity of the adsorption material for dichloromethane is increased, the ageing resistance and the regeneration performance are improved, and the service life of the adsorption material is a subject to be researched and developed urgently by technicians. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides the adsorption material for treating the industrial waste gas dichloromethane and the preparation method thereof, and the adsorption material has the advantages of large adsorption capacity for the dichloromethane, good ageing resistance and regeneration performance, and excellent and stable adsorption performance. Aiming at the technical problems, the invention adopts the following technical scheme: The preparation method of the adsorption material for treating industrial waste gas dichloromethane comprises the steps of preparing a carbon fiber/activated carbon com