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CN-121988286-A - Rubidium cesium ion selective adsorbent based on bio-based porous carbon material and synthesis method thereof

CN121988286ACN 121988286 ACN121988286 ACN 121988286ACN-121988286-A

Abstract

The invention belongs to the field of adsorbents, and in particular relates to a rubidium cesium ion selective adsorbent based on a bio-based porous carbon material and a synthesis method thereof, wherein biomass raw materials are crushed to prepare suspension, and the suspension reacts with an activating agent to obtain a precursor; calcining the precursor in an oxygen-free manner to obtain a bio-based porous carbon material, heating the bio-based porous carbon material to 330-335 ℃ in an inert atmosphere, taking out the bio-based porous carbon material, immediately reacting with a cold ethanol aqueous solution to obtain a modified bio-based porous carbon material, dispersing the modified bio-based porous carbon material in a mixed aqueous solution containing transition metal salt and potassium ferrocyanide, and reacting to obtain the rubidium cesium ion selective adsorbent. The adsorbent has adsorption capacity retention rate of not less than 85% after 5 adsorption-desorption cycles and has adsorption capacity retention rate of not less than 75% after 8 adsorption-desorption cycles in ultrasonic-assisted desorption environment, and has long cycle service life.

Inventors

  • YU FANGYUAN
  • QIAN PING
  • Han Panfei
  • ZHAO GUOQIN

Assignees

  • 江阴苏青新材料有限公司

Dates

Publication Date
20260508
Application Date
20260309

Claims (10)

  1. 1. A synthesis method of rubidium cesium ion selective adsorbent based on bio-based porous carbon material is characterized by comprising the following steps: Step 1, crushing a biomass raw material, and adding the crushed biomass raw material into deionized water to prepare a suspension; step 2, adding an activating agent into the suspension, and heating for reaction to obtain a reaction solution; Step 3, drying the obtained reaction liquid to obtain a precursor; step 4, calcining the precursor in an inert atmosphere, cooling, washing and drying to obtain the bio-based porous carbon material; Step 5, heating the bio-based porous carbon material to 330-335 ℃ in an inert atmosphere, taking out the bio-based porous carbon material to react with cold ethanol water solution immediately, filtering and drying the bio-based porous carbon material after the reaction is finished, so as to obtain a modified bio-based porous carbon material; And 6, dispersing the modified bio-based porous carbon material in a mixed aqueous solution containing transition metal salt and potassium ferrocyanide for reaction, and centrifugally separating, washing and drying the reaction product to obtain the rubidium cesium ion selective adsorbent based on the bio-based porous carbon material.
  2. 2. The method for synthesizing the rubidium cesium ion selective adsorbent based on the bio-based porous carbon material according to claim 1, wherein the method comprises the following steps: in step 2, the activator is phosphoric acid or potassium hydroxide.
  3. 3. The method for synthesizing the rubidium cesium ion selective adsorbent based on the bio-based porous carbon material according to claim 1, wherein in the step 2, the reaction temperature is 60-90 ℃.
  4. 4. The method for synthesizing the rubidium-cesium ion selective adsorbent based on the bio-based porous carbon material according to claim 1, wherein in the step 4, the calcination temperature is 700-720 ℃.
  5. 5. The method for synthesizing the rubidium cesium ion selective adsorbent based on the bio-based porous carbon material according to claim 1, wherein in the step 4, the calcination time is 1.5-2.5 hours.
  6. 6. The method for synthesizing the rubidium cesium ion selective adsorbent based on the bio-based porous carbon material according to claim 1, wherein in the step 5, the temperature of the cold aqueous ethanol solution is 5-7 ℃.
  7. 7. The method according to claim 1, wherein in the step 5, the mass fraction of the cold aqueous ethanol solution is 3.8%.
  8. 8. The method according to claim 1, wherein in the step 6, the transition metal salt is at least one of cobalt salt, nickel salt and copper salt.
  9. 9. The method for synthesizing the rubidium cesium ion selective adsorbent based on the bio-based porous carbon material, as set forth in claim 1, is characterized in that the molar ratio of transition metal ions to potassium ferrocyanide is 1:1-1:3.
  10. 10. A rubidium cesium ion selective adsorbent based on a bio-based porous carbon material, characterized in that it is prepared by the synthetic method according to any one of claims 1 to 9.

Description

Rubidium cesium ion selective adsorbent based on bio-based porous carbon material and synthesis method thereof Technical Field The invention relates to the technical field of adsorbents, in particular to a rubidium cesium ion selective adsorbent based on a bio-based porous carbon material and a synthesis method thereof. Background The existing rubidium cesium ion adsorption material is mainly prepared by loading inorganic functional components (such as heteropolyacid salt and metal ferricyanide) on a synthetic polymer or inorganic carrier so as to realize selective enrichment and separation of rubidium and cesium. Although the materials show higher adsorption capacity and selectivity in a specific system, the problems of poor biocompatibility, insufficient recycling stability and the like of the materials still exist in the practical application process. Patent CN114452950B discloses a preparation method of a high-strength double-crosslinked network rubidium/cesium specific adsorbent, which uses thermoplastic phenolic resin as a matrix, constructs a double-crosslinked network structure by introducing heteropolyacid salt and aminosilane, and obtains the aerogel adsorbent through supercritical carbon dioxide drying. The compression strength of the adsorbent can reach 30 MPa, the adsorption capacity of rubidium and cesium reaches 0.6 mmol/g, and the structural integrity is maintained after multiple dynamic adsorption. The patent CN113509910B discloses a preparation method of metal ferricyanide adsorbent particles for extracting liquid rubidium and cesium resources, the method takes a water-absorbing polymer as a carrier, and functional components such as transition metal ferricyanide and the like are fixed through secondary crosslinking, and the obtained particles have high elasticity, porosity and good acid-base resistance, and are suitable for complex systems such as salt lake brine and the like. The above adsorbents have good mechanical strength and dissolution loss resistance, but the core adsorption component, namely metal ferrocyanide, has the risk of unstable structure under the condition of strong alkalinity or long-term cyclic use, and can possibly cause the release of toxic cyanide ions, meanwhile, for some brines with complex components and severe environment, the environment usually needs to be subjected to ultrasonic auxiliary desorption during desorption, otherwise, the desorption time is long, and the condition of incomplete desorption exists, but for the rubidium cesium adsorption materials adsorbed to saturation, particularly the adsorbents taking porous carbon as one of carriers, the pore channel structure is relatively fragile, and the long-term ultrasonic cavitation can lead to the risk of structural shedding of the core adsorption component, so that the adsorption capacity is obviously reduced, and the cyclic service life is obviously reduced. Therefore, development of a novel rubidium cesium ion adsorption material is needed. Disclosure of Invention The invention aims to provide a rubidium cesium ion selective adsorbent based on a bio-based porous carbon material and a synthesis method thereof, so as to solve the problems. The invention aims to provide a rubidium cesium ion selective adsorbent based on a bio-based porous carbon material and a synthesis method thereof, which can be realized by the following technical scheme: a synthesis method of rubidium cesium ion selective adsorbent based on bio-based porous carbon material comprises the following steps: Step 1, crushing a biomass raw material, and adding the crushed biomass raw material into deionized water to prepare a suspension; step 2, adding an activating agent into the suspension, and heating for reaction to obtain a reaction solution; Step 3, drying the obtained reaction liquid to obtain a precursor; step 4, calcining the precursor in an inert atmosphere, cooling, washing and drying to obtain the bio-based porous carbon material; Step 5, heating the bio-based porous carbon material to 330-335 ℃ in an inert atmosphere, taking out the bio-based porous carbon material to react with cold ethanol water solution immediately, filtering and drying the bio-based porous carbon material after the reaction is finished, so as to obtain a modified bio-based porous carbon material; And 6, dispersing the modified bio-based porous carbon material in a mixed aqueous solution containing transition metal salt and potassium ferrocyanide for reaction, and centrifugally separating, washing and drying the reaction product to obtain the rubidium cesium ion selective adsorbent based on the bio-based porous carbon material. Further, in step 2, the activator is phosphoric acid or potassium hydroxide. Further, in step 2, the reaction temperature is 60 to 90 ℃. Further, in step 4, the calcination temperature is 700 to 720 ℃. Further, in step 4, the calcination time is 1.5 to 2.5 hours. Further, in step 5, the temperature of the cold aqueous ethanol solution