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CN-122025446-A - Desalination material containing ruthenium and titanium, preparation method and application thereof

CN122025446ACN 122025446 ACN122025446 ACN 122025446ACN-122025446-A

Abstract

The invention relates to the field of capacitance desalination, and discloses a desalination material containing ruthenium and titanium, and a preparation method and application thereof. The method comprises the steps of S1, carrying out anodic oxidation treatment on titanium sheets to obtain a titanium dioxide nanotube array, S2, carrying out electrochemical deposition on the titanium dioxide nanotube array by utilizing Ru-containing deposition liquid to obtain a Ru-loaded titanium dioxide nanotube array, and S3, calcining the Ru-loaded titanium dioxide nanotube array. The preparation method is simple and efficient, and the prepared electrode material has large specific surface area, good conductivity and high ruthenium loading, shows good desalination performance in the desalination process, still keeps good desalination capacity after multiple desalination-desorption processes, has stable chemical performance and has important significance in the actual production process.

Inventors

  • Zhang Daiyang
  • LI HAILONG
  • CAO ZONGLUN
  • SUN JIE
  • QIN QIMING
  • GUO MINWEN

Assignees

  • 中国石油化工股份有限公司
  • 中石化(北京)化工研究院有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1.A method for preparing a ruthenium and titanium containing desalination material, the method comprising the steps of: s1, performing anodic oxidation treatment on a titanium sheet to obtain a titanium dioxide nanotube array; S2, performing electrochemical deposition on the titanium dioxide nanotube array by utilizing Ru-containing deposition liquid to obtain a Ru-loaded titanium dioxide nanotube array; And S3, calcining the Ru-loaded titanium dioxide nanotube array.
  2. 2. The production method according to claim 1, wherein in step S1, the anodic oxidation treatment comprises electrolyzing the titanium sheet and the platinum sheet in the presence of an electrolyte at an applied voltage of 50 to 70V for 20 to 40 minutes; And/or the electrolyte comprises 0.2-0.8wt% of ammonium fluoride, 1.5-3wt% of deionized water and 96.2-98wt% of ethylene glycol; And/or, the method further comprises the steps of washing and roasting an anodic oxidation product after the anodic oxidation treatment of the titanium sheet to obtain a titanium dioxide nanotube array; And/or the conditions of the calcination include heating the anodic oxidation product to 300-500 ℃ at a heating rate of 5-10 ℃ per minute and maintaining the temperature for 1-3 hours.
  3. 3. The production method according to claim 1 or 2, wherein in step S1, the titanium sheet is subjected to pretreatment before being subjected to anodic oxidation treatment; and/or the pretreatment comprises cleaning the titanium sheet by acetone, inorganic acid, ethanol and water in sequence; and/or the inorganic acid solution is selected from at least one of hydrochloric acid, sulfuric acid and nitric acid.
  4. 4. The production method according to claim 1 or 2, wherein in step S2, the Ru content in the Ru-containing deposition solution is 1-4mmol/L, preferably 2-3mmol/L; and/or, ru exists in the form of ruthenium salt in the Ru-containing deposition solution; And/or the dosage of the Ru-containing deposition solution calculated by Ru is 0.05-0.1mmol relative to the titanium sheet of 16cm 2 .
  5. 5. The preparation method according to claim 1 or 2, wherein the pH of the Ru-containing deposition solution is 1-3, preferably 2-2.5.
  6. 6. The method according to claim 1 or 2, wherein the electrochemical deposition is performed by cyclic voltammetry, and the parameters include a scanning rate of 160-200mV/s, a potential lower limit of negative scanning point of-0.8 to-0.6V, a potential upper limit of positive scanning point of 1-2V, and a number of cycles of 60-100 times.
  7. 7. The production method according to claim 1 or 2, wherein in step S3, the calcination conditions include heating the Ru-loaded titania nanotube array to a temperature of 300 to 500 ℃ at a heating rate of 10 to 15 ℃ per minute and maintaining the temperature for 1 to 3 hours.
  8. 8. A desalination material comprising ruthenium and titanium, wherein the desalination material is produced by the method of any one of claims 1-7; or the desalination material comprises a titanium dioxide nanotube array and RuO 2 loaded on the titanium dioxide nanotube array; The desalination amount per unit area of the desalination material is not less than 1.1mg/cm 2 .
  9. 9. The desalination material of claim 8, wherein the desalination material has a specific surface area of 120-140m 2 /g; And/or, in the desalination material, ru is present in the form of RuO 2 ; And/or, the loading of RuO 2 is 0.05-0.2wt% on Ru basis based on the total weight of the desalination material.
  10. 10. Use of a desalination material as claimed in claim 8 or 9 in capacitive desalination, desalination of sea water or brackish water.

Description

Desalination material containing ruthenium and titanium, preparation method and application thereof Technical Field The invention relates to the field of capacitance desalination, in particular to a desalination material containing ruthenium and titanium, and a preparation method and application thereof. Background With the rapid population growth and industry development, the demand for fresh water resources by humans is increasing. Desalination technology has become an important point of research in order to alleviate the problem of shortage of fresh water resources. The traditional desalting technology mainly comprises a thermal method (such as multistage flash evaporation, vapor compression and the like) and a membrane method (such as a reverse osmosis method, an ion exchange method, an electrodialysis method and the like), wherein the thermal method generally has the problems of high cost, high energy consumption, easiness in secondary pollution and the like, and the membrane used by the membrane method is easy to block and damage and needs to be replaced periodically, so that the economic burden is further increased. The capacitance desalination technology (CAPACITIVE DEIONIZATION, CDI) is a brand new desalination technology based on the principle of double-layer capacitance, and has the advantages of low energy consumption, high efficiency, energy conservation, environmental protection, easy industrialization and the like. At present, the desalting electrode material mainly takes powder as a main material, and the preparation method mainly adopts a slurry coating method, namely, paste consisting of active materials, binders, conductive additives and the like is uniformly scraped on a current collector material such as foam nickel, foam titanium and the like. The preparation method is complex, the electrode material is easy to fall off in the actual use process, stable long-period operation is difficult to realize, and the use of the adhesive can reduce the conductivity of the electrode. The titanium dioxide has the advantages of stable chemical property, abundant natural resources, low price, no toxicity, no harm and the like. The TiO 2 nano-tubes which are arranged in a highly ordered way are prepared by adopting an anodic oxidation method, and have large specific surface area. The TiO 2 nano tube grown in situ is tightly combined with the titanium substrate, the titanium substrate can be directly used as a current collector, and the method can greatly simplify the preparation process of the electrode. However, the conductivity of the TiO 2 nanotubes is poor, which limits the application of the nanotubes in capacitive desalination. Disclosure of Invention The invention aims to solve the problems of high cost, high energy consumption, low desalination rate and difficult realization of stable long-period operation of the desalination technology in the prior art, and provides a desalination material containing ruthenium and titanium, a preparation method and application thereof, wherein the preparation method is simple and efficient, the prepared electrode material has large specific surface area, good conductivity and high ruthenium loading, shows good desalination performance in the desalination process, still keeps good desalination capacity after multiple desalination-desorption processes, has stable chemical performance and has important significance in the actual production process. In order to achieve the above object, a first aspect of the present invention provides a method for producing a desalted material containing ruthenium and titanium, wherein said method comprises the steps of: s1, performing anodic oxidation treatment on a titanium sheet to obtain a titanium dioxide nanotube array; S2, performing electrochemical deposition on the titanium dioxide nanotube array by utilizing Ru-containing deposition liquid to obtain a Ru-loaded titanium dioxide nanotube array; And S3, calcining the Ru-loaded titanium dioxide nanotube array. In a second aspect the present invention provides a desalination material comprising ruthenium and titanium, wherein the desalination material is produced by the method of the first aspect; or the desalination material comprises a titanium dioxide nanotube array and RuO 2 loaded on the titanium dioxide nanotube array; The desalination amount per unit area of the desalination material is not less than 1.1mg/cm 2. The third aspect of the invention provides an application of the desalination material of the second aspect in capacitive desalination, seawater or brackish water desalination. According to the technical scheme, the preparation method of the desalting material containing ruthenium and titanium, and the application of the desalting material have the advantages that the preparation method is simple and efficient, the prepared electrode material has large specific surface area, good conductivity, high ruthenium loading capacity and difficult shedding of rutheniu