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CN-120058100-B - ORP (ORP) controlled slow-release material and preparation method and application thereof

CN120058100BCN 120058100 BCN120058100 BCN 120058100BCN-120058100-B

Abstract

An ORP controlled slow-release material is prepared through pulverizing biomass, adding it to deoxidized purified water, adding polyvinyl pyrrolidone, adding Fe salt, stirring, centrifugal drying to obtain Fe-C core-shell precursor, calcining under N 2 to obtain Fe-C core-shell material, dissolving cerium nitrate in ammonia water, adding it, centrifugal separation, drying, and calcining. The ORP regulation and control slow-release material prepared by the invention can effectively utilize the CeO 2 layer as a barrier to isolate corrosion of chloride ions in water to Fe 0 @C core, thereby accurately regulating and controlling the micro-electrolysis speed of Fe 0 @C. The mechanism ensures that the oxidation-reduction potential (ORP) in the anaerobic degradation system is maintained stable for a long time, an optimized living environment is constructed for the microbial community, and the anaerobic degradation system is finally promoted to form good biological degradation efficiency and stable microbial community structure.

Inventors

  • CHEN YINGWEN
  • PENG JIAPENG
  • LI HUI
  • FAN MENGJIE
  • DU LIZHI

Assignees

  • 南京工业大学
  • 江苏英格丽景环保科技有限公司

Dates

Publication Date
20260508
Application Date
20250122

Claims (9)

  1. 1. A preparation method of an ORP controlled slow-release material comprises the following steps of 1) crushing biomass, adding the crushed biomass into deoxidized purified water, then adding polyvinylpyrrolidone, then adding ferric salt, stirring, centrifuging, drying to obtain the iron carbon core-shell precursor, wherein the mass concentration of polyvinylpyrrolidone in a reaction system is 0.5% -1%, the mass ratio of the ferric salt to the biomass is (1-20): 1%, 2) preparing the iron carbon core-shell material, namely calcining the iron carbon core-shell precursor in an N 2 atmosphere to obtain the iron carbon core-shell material, and 3) preparing the Fe 0 @C@CeO 2 slow-release material, namely dissolving cerium nitrate in ammonia water, adding the iron carbon core-shell material, the mass ratio of cerium nitrate to the iron carbon core-shell material is (1-10), centrifuging, separating and drying after stirring, and finally roasting to obtain the ORP controlled slow-release material.
  2. 2. The method for producing an ORP controlled-release material according to claim 1, wherein the biomass is tea leaves residue, rice straw residue, coconut husk or wax gourd peel.
  3. 3. The method for preparing an ORP controlled-release material according to claim 1, wherein the biomass is crushed to a mesh size of 500 to 2500 mesh.
  4. 4. The method for preparing an ORP controlled release material according to claim 1, wherein the iron salt is ferric sulfate, ferric nitrate or ferric chloride.
  5. 5. The preparation method of the ORP controlled-release material according to claim 1, wherein the mass ratio of the ferric salt to the biomass is (1-10): 1, the centrifugation time is 5-20 min, and the vacuum drying time is 8-24 h.
  6. 6. The method for preparing the ORP controlled-release material according to claim 1, wherein the calcination temperature in the step 2) is 400-900 ℃ and the reaction time is 1-8 hours.
  7. 7. The method for preparing the ORP controlled-release material according to claim 1, wherein the roasting temperature in the step 3) is 600-1000 ℃ and the reaction time is 1-8 hours.
  8. 8. The ORP modulating slow release material produced by the method of any one of claims 1-7.
  9. 9. The use of the ORP modulating slow release material of claim 8 in an electrochemical catalytic system.

Description

ORP (ORP) controlled slow-release material and preparation method and application thereof Technical Field The invention relates to the field of water pollutant treatment, in particular to an ORP (organic light-emitting diode) regulation and control slow-release material and a preparation method and application thereof. Background The oxidation-reduction potential (ORP), one of the important parameters in anaerobic degradation systems, is an indicator of the measurement of the oxidability and reducibility in solution, reflecting the balance between oxidizing and reducing agents. Under anaerobic conditions, microorganisms typically utilize other compounds as terminal electron acceptors for energy metabolism instead of oxygen. Changes in ORP can regulate the activity of microbial metabolic pathways and the rate of product formation. In the fermentation process performed under anaerobic conditions, it is sometimes necessary to prevent the occurrence of excessive reduction reactions and oxidation reactions. Maintaining an appropriate ORP may reduce the presence of oxidants, thereby slowing or preventing unintended redox reactions, protecting the degradability of contaminants and methane yield. However, too high or too low an ORP can result in inhibition of the anaerobic degradation system. When the ORP is too high, VFAs may accumulate in the system, resulting in a drop in pH, thereby inhibiting the activity and growth of microorganisms, which results in a decrease in wastewater treatment efficiency, increasing the running cost of the system, and when the ORP is too low, the pH of the system may slightly increase, on the one hand, and on the other hand, the too low pH may inhibit the hydrolysis and acidification of anaerobic microorganisms, even in the methanogenic stage, which significantly reduces the performance of the anaerobic digestion system. In addition, the oxidation species generated during anaerobic digestion can raise ORP, accelerate corrosiveness to the material, and thus make ORP regulation unstable. Only long-term stable ORP can put the anaerobic degradation system in an excellent state. Thus, controlling ORP at a suitable potential is a key measure to ensure long-term stable operation of anaerobic degradation systems. The material ensures that the ORP of the wastewater in anaerobic degradation is in a proper range for a long time by preparing an ORP controlled and sustained-release material. Secondly, the material can serve as a nucleus for growth and propagation of microorganisms, and gives good growth and propagation environment for anaerobic microorganisms, so that long-term health and stability of an anaerobic degradation system are maintained. And thirdly, the material can help the oxidation of pollutants to change the pollutants into substances which are changed from macromolecular substances into medium and micromolecules and are easy to be degraded and utilized by anaerobic microorganisms, so that the performance of an anaerobic degradation system is further promoted. In conclusion, the method is used for preparing the ORP controlled and sustained-release material so that the ORP is in a proper range, the anaerobic degradation system has long-term ORP stability and pollutant degradation performance, and the anaerobic degradation system has good biodegradation effect. Disclosure of Invention Aiming at the technical problems, the invention provides an ORP (organic light-emitting diode) controlled-release material and a preparation method and application thereof. The material ensures the long-term stability of the ORP of the wastewater in anaerobic degradation by preparing an ORP controlled and sustained-release material. Secondly, the material can serve as a nucleus for growth and propagation of microorganisms, and gives good growth and propagation environment for anaerobic microorganisms, so that long-term health and stability of an anaerobic degradation system are maintained. And thirdly, the material can help the oxidation of pollutants through iron-carbon micro-electrolysis, so that the pollutants are changed into substances which are changed from macromolecular substances into medium and small molecules and are easy to be degraded and utilized by anaerobic microorganisms, and the performance of an anaerobic degradation system is further promoted. Finally, when Cl - in the water corrodes the ORP adjusting material, ceO 2 can shield the corrosiveness of Cl - to the ORP adjusting material, and avoid the excessive speed of iron-carbon micro-electrolysis, thereby ensuring that the ORP adjusting capability has long-term stability and good biodegradation effect. The preparation method of the ORP controlled slow-release material comprises the following steps of 1) crushing biomass, adding the crushed biomass into deoxidized purified water, then adding polyvinylpyrrolidone, adding ferric salt, stirring, centrifuging, drying to obtain the iron carbon core-shell precursor, wherein the mass concent