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CN-122011389-A - Porous sulfur-rich polymer heavy metal adsorbent and preparation method thereof

CN122011389ACN 122011389 ACN122011389 ACN 122011389ACN-122011389-A

Abstract

The invention belongs to the technical field of heavy metal adsorbents, and particularly relates to a porous sulfur-rich polymer heavy metal adsorbent and a preparation method thereof, wherein the porous sulfur-rich polymer heavy metal adsorbent is prepared from sulfur, dopamine methacrylamide, a divinyl monomer cross-linking agent and an inorganic salt pore-forming agent; the porous sulfur-rich polymer heavy metal adsorbent improves the hydrophilicity of the sulfur polymer by introducing catechol groups into the sulfur polymer, so that the adsorbent is more easily soaked by water, the adsorption capacity of the sulfur polymer to heavy metal ions such as Fe 3+ 、Ni 2+ 、Cu 2+ and the like is greatly improved by introducing the catechol groups, the adsorption range of the sulfur polymer-based adsorbent is widened, and the porous structure further improves the specific surface area of the adsorbent from the macro-level, so that the adsorption efficiency is improved.

Inventors

  • CUI JIAN
  • CHU ZHENGXIANG
  • DENG BAICE
  • CHEN CHANG
  • LI LIANFENG

Assignees

  • 江苏燎原环保科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260310

Claims (10)

  1. 1. A porous sulfur-rich polymer heavy metal adsorbent is characterized in that, Is prepared from sulfur, dopamine methacrylamide, a divinyl monomer cross-linking agent and an inorganic salt pore-forming agent; the chemical molecular structural formula is as follows: ; Wherein R is a group other than vinyl in the divinyl monomer crosslinking agent, and n ranges from 5 to 100.
  2. 2. The porous sulfur-rich polymer heavy metal adsorbent of claim 1, The porosity of the porous sulfur-rich polymer heavy metal adsorbent is 45% -65%.
  3. 3. The porous sulfur-rich polymer heavy metal adsorbent of claim 1, The divinyl monomer crosslinking agent comprises a combination of any one or more of 1, 3-diisopropenylbenzene, divinylbenzene, ethylene glycol divinyl ether, divinyl sulfone and butanediol divinyl ether.
  4. 4. The porous sulfur-rich polymer heavy metal adsorbent of claim 1, The inorganic salt pore-forming agent comprises any one or a combination of a plurality of sodium chloride, ammonium carbonate and ammonium bicarbonate.
  5. 5. A method for preparing the porous sulfur-rich polymer heavy metal adsorbent as recited in any one of claims 1 to 4, comprising the steps of: S1, heating sulfur to 160-200 ℃ for melting; s2, adding dopamine methacrylamide, a divinyl monomer cross-linking agent and an inorganic salt pore-forming agent into molten sulfur, carrying out heat preservation reaction to obtain a homogeneous elastic solid substance, and cooling; S3, grinding the homogeneous elastic solid matters into particles with the particle size range of 1-10 mm, and washing the particles with water to remove the inorganic salt pore-forming agent, thereby obtaining the porous sulfur-rich polymer heavy metal adsorbent.
  6. 6. The method according to claim 5, wherein, The ratio of the weight of the sulfur to the sum of the weights of the dopamine methacrylamide and the divinyl monomer crosslinking agent is not less than 0.5.
  7. 7. The method according to claim 5, wherein, The weight ratio of the dopamine methacrylamide to the divinyl monomer crosslinking agent is 1:1-1:3.
  8. 8. The method according to claim 5, wherein, The weight ratio of the inorganic salt pore-forming agent to the sulfur is 0.5-0.7.
  9. 9. The method according to claim 5, wherein, And (3) the times of water washing in the step (S3) are not less than 3 times.
  10. 10. Use of a porous sulfur-rich polymer heavy metal adsorbent as defined in any one of claims 1 to 4 in the field of heavy metal adsorption.

Description

Porous sulfur-rich polymer heavy metal adsorbent and preparation method thereof Technical Field The invention belongs to the technical field of heavy metal adsorbents, and particularly relates to a porous sulfur-rich polymer heavy metal adsorbent and a preparation method thereof. Background The pollution of heavy metal ions such as mercury (II), copper (II), lead (II), iron (III) and the like in water poses serious threats to the ecological environment and human health. Sulfur, which is a low-cost and abundant byproduct of petrochemical industry, can coordinate with heavy metal ions and can be used as a heavy metal adsorbent. However, the elemental sulfur cannot be applied on a large scale in the adsorption field due to its poor physical properties. In recent years, the preparation of polysulfide polymers by inverse vulcanization has become one of the most widely used techniques for modifying the properties of elemental sulfur. The technology is to react polyene monomer with elemental sulfur to produce stable organic/inorganic polymer sulfide. At present, polysulfide polymer prepared based on inverse vulcanization method is widely used in heavy metal adsorption field [Angew Chem Int Ed, 2016, 55(5): 1714-1718; Chem Commun, 2016, 52(31): 5383-5386; J Mater Chem A, 2017, 5(35): 18603-18609]. However, since sulfur has a strong adsorption effect on only soft metal ions such as mercury (II), silver (II) has poor adsorption performance on iron (III), chromium (III, VI), copper (II) and the like. In addition, the hydrophobicity of the sulfur polymer is strong, which is not beneficial to the infiltration of water. Therefore, how to overcome the defect of insufficient adsorption capability of polysulfide polymer to hard metal ions is a technical problem to be solved in the field. It should be noted that the above information disclosed in this background section is only for understanding the background of the inventive concept and therefore the above description is not to be construed as constituting prior art information. Disclosure of Invention The embodiment of the disclosure at least provides a porous sulfur-rich polymer heavy metal adsorbent and a preparation method thereof. In a first aspect, an embodiment of the present disclosure provides a porous sulfur-rich polymer heavy metal adsorbent, which is prepared from sulfur, dopamine methacrylamide, a divinyl monomer crosslinking agent and an inorganic salt pore-forming agent, and has a chemical molecular structural formula as follows: Wherein R is a group other than vinyl in the divinyl monomer crosslinking agent, and n ranges from 5 to 100. In an alternative embodiment, the porous sulfur-rich polymer heavy metal adsorbent has a porosity of 45% -65%. In an alternative embodiment, the divinyl monomer crosslinking agent comprises a combination of any one or more of 1, 3-diisopropenylbenzene, divinylbenzene, ethylene glycol divinyl ether, divinyl sulfone, and butanediol divinyl ether. In an alternative embodiment, the inorganic salt porogen comprises a combination of any one or more of sodium chloride, ammonium carbonate, and ammonium bicarbonate. In a second aspect, the embodiment of the disclosure also provides a preparation method of the porous sulfur-rich polymer heavy metal adsorbent, which comprises the following steps of S1, heating sulfur to 160-200 ℃ for melting, S2, adding dopamine methacrylamide, a divinyl monomer cross-linking agent and an inorganic salt pore-forming agent into the melted sulfur, carrying out heat preservation reaction to obtain a homogeneous elastic solid substance, cooling, and S3, grinding the homogeneous elastic solid substance into particles with the particle size range of 1-10 mm, and washing to remove the inorganic salt pore-forming agent to obtain the porous sulfur-rich polymer heavy metal adsorbent. In an alternative embodiment, the ratio of the weight of the sulfur to the sum of the weights of the dopamine methacrylamide and the divinyl monomer crosslinker is no less than 0.5. In an alternative embodiment, the weight ratio of the dopamine methacrylamide to the divinyl monomer crosslinking agent is 1:1-1:3. In an alternative embodiment, the weight ratio of the inorganic salt pore-forming agent to the sulfur is 0.5-0.7. In an alternative embodiment, the number of water washes in S3 is not less than 3. In a third aspect, the embodiments of the present disclosure further provide an application of the porous sulfur-rich polymer heavy metal adsorbent in the heavy metal adsorption field as described above. The porous sulfur-rich polymer heavy metal adsorbent has the beneficial effects that catechol groups are introduced into the sulfur polymer, so that the hydrophilicity of the sulfur polymer is improved, the adsorbent is more easily soaked by water, the adsorption capacity of the sulfur polymer to heavy metal ions such as Fe 3+、 Ni2+、Cu2+ and the like is greatly improved by introducing the catechol groups, the adsorption range of th