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CN-121974418-A - Composite treating agent for encapsulating and curing fluorescent substance and application thereof

CN121974418ACN 121974418 ACN121974418 ACN 121974418ACN-121974418-A

Abstract

The invention relates to the technical field of fine chemical engineering, in particular to a composite treating agent for encapsulating and curing fluorescent substances, which comprises the following raw materials, by mass, 300-400 parts of sodium bicarbonate, 200-300 parts of calcium chloride, 50-100 parts of a bifunctional template agent and 5-10 parts of a decoloring agent. The composite treating agent can effectively remove heavy metal ions and fluorescent dyes in wastewater, improve water quality and the like.

Inventors

  • SUN YOULIANG
  • HE WENXIU
  • SUN FEIFEI
  • YANG JINLING

Assignees

  • 辽宁生态工程职业学院

Dates

Publication Date
20260505
Application Date
20260311

Claims (10)

  1. 1. The composite treating agent for encapsulating and curing the fluorescent substance is characterized by comprising, by mass, 300-400 parts of sodium bicarbonate, 200-300 parts of calcium chloride, 50-100 parts of a bifunctional template agent and 5-10 parts of a decoloring agent.
  2. 2. The composite treatment agent for encapsulating a cured fluorescent substance according to claim 1, wherein the raw material of the composite treatment agent further comprises 5-10 parts by mass of a flocculation aid.
  3. 3. The composite treatment agent for encapsulating a cured fluorescent substance as claimed in claim 2, wherein the flocculation aid is cationic guar gum.
  4. 4. The composite treatment agent for encapsulating and curing fluorescent substances according to claim 1, wherein the preparation method of the bifunctional template agent comprises the following steps of dissolving carboxymethyl chitosan in MES buffer solution, adding carbodiimide and N-hydroxysuccinimide, oscillating for 20-40 minutes at room temperature, then adding phosphoethanolamine, reacting for 20-28 hours at room temperature, dialyzing the reaction solution for 3 days after finishing, and freeze-drying to obtain a white solid, namely the bifunctional template agent.
  5. 5. The composite treatment agent for encapsulating a cured fluorescent substance according to claim 4, wherein the total mass of the carbodiimide and the N-hydroxysuccinimide is 0.4 to 0.8 times the mass of carboxymethyl chitosan.
  6. 6. The composite treatment agent for encapsulating a cured fluorescent substance according to claim 4, wherein the degree of substitution of carboxymethyl chitosan is 0.7 to 0.9.
  7. 7. The composite treatment agent for encapsulating a cured fluorescent substance according to claim 4, wherein the mass ratio of the carbodiimide to the N-hydroxysuccinimide is 1 (0.5 to 0.7).
  8. 8. The composite treatment agent for encapsulating and curing fluorescent substance according to claim 4, wherein the addition amount of the phosphoethanolamine is 0.4-0.8 times of the mass of the carboxymethyl chitosan.
  9. 9. The composite treatment agent for encapsulating a cured fluorescent substance as claimed in claim 1, wherein the decoloring agent is activated carbon.
  10. 10. Use of a composite treatment agent for encapsulating a cured fluorescent substance, characterized by comprising the following steps: (1) Adding the bifunctional template agent into the wastewater containing the fluorescent substances, and stirring at 140-160 rpm for 10-20 min to fully disperse the bifunctional template agent; (2) Then adding calcium chloride into the system in the step (1), stirring for 3-8 min, adding sodium bicarbonate and stirring for 25-35 min at 50-70 rpm; (3) And adding a flocculation auxiliary agent and a decoloring agent, stirring for 5-15 min at 35-45 rpm, standing for sedimentation after the completion of the stirring, and filtering to obtain purified water.

Description

Composite treating agent for encapsulating and curing fluorescent substance and application thereof Technical Field The invention relates to the technical field of fine chemical engineering, in particular to a composite treating agent for encapsulating and curing fluorescent substances. Background The wastewater containing fluorescent substances, particularly wastewater containing toxic fluorescent dyes or heavy metal quantum dots, has the treatment difficulty that the concentration of the substances is not high but is harmful, and the substances are stably dispersed in the form of molecules or nanoparticles and are difficult to separate by conventional precipitation. Adsorption, membrane separation or advanced oxidation are mostly adopted in the prior art. The adsorption method has the problems of saturation and regeneration, high membrane separation cost and easy pollution, and the advanced oxidation can damage the incomplete fluorescent structure to generate unknown byproducts. In recent years, biomimetic mineralization (Biomimetic Mineralization) has been attracting attention because of its mild conditions, stable products and environmental friendliness. For example, calcium carbonate deposition is induced by using templates such as polyaspartic acid for heavy metal blocking. However, the current water treatment agent has the following problems that firstly, the mineralization process lacks selectivity, and the existing biomimetic mineralization research is mostly focused on inducing mineral deposition per se or blocking ionic heavy metals. The method is characterized in that a mineral is guided to grow on the surface/periphery of the mineral by taking soluble organic fluorescent molecules or nano fluorescent particles as a 'nucleus' or a 'template', so that selective encapsulation is realized, an effective means is lacked, the mineralization rate is contradictory to water quality conditions, namely, rapid precipitation of calcium carbonate needs higher Ca 2+ and CO 32- concentrations and higher pH, which are different from the conditions of many actual wastewater, other pollutants can be precipitated or sludge can be generated due to the fact that an alkaline agent is imposed, the problem of floc stability is that simply formed calcium carbonate particles are tiny, sedimentation is slow, combination with fluorescent substances is weak, and the calcium carbonate can be released again in a later period or in an acidic condition, and fourth, the cost of a functional template is high, and the cost of a common bionic template (such as polypeptide and synthetic polymer with specific sequences) is high, so that the method is difficult to apply to large-scale water treatment. At present, many studies on industrial wastewater purification exist, for example, patent number CN109647353B discloses a heavy metal wastewater composite treatment agent, a preparation method and application thereof, and the heavy metal wastewater composite treatment agent is prepared from 20-30 parts of crop waste, 10-30 parts of humic acid, 20-30 parts of xanthate modified quartz sand, 4-6 parts of sodium alginate, 4-6 parts of chitosan, 4-10 parts of calcium thioglycolate and 3-6 parts of calcium chloride. The treating agent contains various heavy metal reactive groups, can realize high-efficiency adsorption of various heavy metals at the same time, has high sedimentation speed, high treatment efficiency, high stability and strong environmental tolerance, solves the problem of difficult treatment of crop wastes, changes waste into valuables, and realizes the recycling utilization of the crop wastes. Under proper conditions, the removal rate of heavy metals can reach 99 percent. The heavy metal treating agent has the advantages of wide raw material sources, simple preparation process and good application prospect in the aspect of heavy metal treatment. However, the above-mentioned publication has a good effect only on the removal of heavy metals, and has a limited effect on the treatment of some industrial wastewater containing a large amount of fluorescent agents. Therefore, development of a composite treating agent which is low in cost and can effectively remove heavy metal ions and fluorescent dye in wastewater is urgent. Disclosure of Invention The invention aims to provide a compound treating agent for encapsulating and curing fluorescent substances and application thereof, so as to solve the problem that the current water treatment agent has poor effect on fluorescent dye sewage treatment. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a composite treating agent for encapsulating and curing fluorescent substances, which comprises the following raw materials, by mass, 300-400 parts of sodium bicarbonate, 200-300 parts of calcium chloride, 50-100 parts of a bifunctional template agent and 5-10 parts of a decoloring agent. The application adopts sodium bicar