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Method for elimination ions in system of TiO2 hydrate granules in nano level and water

A hydrate and nano-scale technology, applied in the field of membrane separation, can solve problems such as the inability to remove inorganic ions, and achieve excellent photocatalytic performance

Inactive Publication Date: 2005-07-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the Cl of the system is cleaned - Concentration below 2.5×10 -3 mol / L, the system forms a stable emulsion, which cannot further remove various inorganic ions

Method used

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  • Method for elimination ions in system of TiO2 hydrate granules in nano level and water
  • Method for elimination ions in system of TiO2 hydrate granules in nano level and water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see figure 1 , using a polyethersulfone (PES) ultrafiltration flat membrane device 1 with a molecular weight cut-off of 50K, for nano-TiO 2 Hydrated material liquid (Cl - The concentration is 2.51×10 -3 mol / L) for concentration and desalination. The feed liquid is poured into the feed tank 2, the high-pressure pump 3 is started, the bypass valve 4 is opened, the operating pressure (based on the reading of the pressure gauge 5) is adjusted to 0.49MPa, the amount of feed liquid added is 2.5L, and the experiment is carried out according to the above steps. When the feed solution is concentrated to 0.5L, add 0.6L deionized water to carry out dilution and wash, and the wash multiple is 1.2. When the volume of the feed liquid is concentrated to 0.5L again, add 0.6L deionized water to dilute and wash. After several washes, the Cl of the concentrated solution - The concentration is 7.98×10 -5 mol / L, the average membrane flux is maintained at 90L / m 2 .h and above. During ...

Embodiment 2

[0024] Using polysulfone (PS) ultrafiltration flat membrane equipment with a molecular weight cut-off of 20K, the 2 Hydrated material liquid (Cl - Concentration is 0.5mol / L) to concentrate and desalt. The operating pressure is 0.25MPa, the amount of feed liquid added is 2.0L, and the experiment is carried out according to the above steps. When the feed liquid is concentrated to 0.5L, add deionized water for dilution and top washing, and the jacket water multiple is 1.0. After several washes, the Cl of the concentrate - The concentration is 4.24×10 -5 mol / L, the average membrane flux is maintained at 115L / m 2 .h and above. During the experiment, samples were taken every 3 minutes for testing.

Embodiment 3

[0026] Using polysulfone (PS) ultrafiltration flat membrane equipment with a molecular weight cut-off of 20K, the 2 Hydrated material liquid (Cl - Concentration is 0.5mol / L) to concentrate and desalt. The operating pressure is 0.4MPa, the amount of feed liquid added is 2.0L, and the experiment is carried out according to the above steps. When the feed liquid is concentrated to 0.16L, add deionized water for dilution and top washing, and the jacket water multiple is 1.5. After several washes, the Cl of the concentrate - The concentration is 6.12×10 -5 mol / L, the average membrane flux is maintained at 80L / m 2 .h and above. During the experiment, samples were taken every 5 minutes for testing.

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Abstract

A process for removing ions from the TiO2 hydrate nanoparticle-water system includes such steps as loading raw liquid in tank, starting high-pressure pump while opening the by-pass valve, regulating pressure, measuring the throughput of transmitted liquid, ion activity and electric conductivity, concentrating, and washing with deionized water until the content of ions can meet the requirement.

Description

(1) Technical field [0001] The invention relates to membrane separation, in particular to the use of ultrafiltration membrane separation technology for nano-TiO 2 Hydrate granular system for desalination, separation, including removal of Cl - , OH - , NO 3 - , SO 4 2- , CO 3 2- 、HCO 3 - , NH 4 + 、Na + , Ca 2+ , Mg 2+ and so on for all kinds of inorganic ions. (2) Background technology [0002] Nanoparticles (tiny solid particles with a particle size of 1-100nm) are increasingly becoming the focus of research in various countries due to their unique properties. With the superfineness of the material, its surface atomic structure and crystal structure change, resulting in surface effects, volume effects, quantum size effects and macroscopic quantum tunneling effects that bulk materials do not have, making nanoparticle materials different from conventional particle materials. Compared with a series of excellent physical and chemical properties, it shows a broad ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/00B01D61/14C01G23/047C01G23/053
Inventor 何旭敏夏海平蓝伟光陈毓敏朱亚君陈鸿博韩国彬丁马太
Owner XIAMEN UNIV
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